阅读说明：本技术 天线及通信设备 (Antenna and communication device ) 是由 赵捷 迈克尔·卡迪特维兹 周晓 陶醉 于 2020-05-20 设计创作，主要内容包括：本申请提供了一种天线及通信设备,属于天线技术领域。该天线包括：叠加设置的水平极化天线和垂直极化天线,该水平极化天线包括金属片,该金属片能够分别与该水平极化天线中的双面平行带线以及同轴电缆的第一导体连接。由于该金属片的最大内切圆的直径大于该双面平行带线的线宽,且金属片和同轴电缆均位于基板的第一侧,因此该金属片能够有效抑制该同轴电缆中的感应电流,从而可以降低该感应电流对垂直极化天线的影响,进而可以在避免增加天线整体高度的前提下,有效提高该水平极化天线与垂直极化天线之间的隔离度。(The application provides an antenna and communication equipment, and belongs to the technical field of antennas. The antenna includes: the antenna comprises a horizontal polarization antenna and a vertical polarization antenna which are arranged in a superposed mode, wherein the horizontal polarization antenna comprises a metal sheet which can be respectively connected with a double-sided parallel strip line in the horizontal polarization antenna and a first conductor of a coaxial cable. Because the diameter of the maximum inscribed circle of the metal sheet is greater than the line width of the double-sided parallel strip line, and the metal sheet and the coaxial cable are both positioned on the first side of the substrate, the metal sheet can effectively inhibit induced current in the coaxial cable, thereby reducing the influence of the induced current on the vertical polarization antenna, and further effectively improving the isolation between the horizontal polarization antenna and the vertical polarization antenna on the premise of avoiding increasing the overall height of the antenna.)

1. An antenna, characterized in that the antenna comprises: the horizontal polarization antenna and the vertical polarization antenna that the stack set up, horizontal polarization antenna includes: the antenna comprises a substrate, at least one radiation oscillator, at least one double-sided parallel strip line, a metal sheet and a coaxial cable, wherein the metal sheet and the coaxial cable are positioned on a first side of the substrate, and the first side is the side of the substrate, which is far away from the vertical polarization antenna;

the double-sided parallel strip line is connected with the radiation oscillator;

the metal sheet is connected with the conductor of the double-sided parallel strip line on the first side, and the diameter of the maximum inscribed circle of the metal sheet is larger than the line width of the double-sided parallel strip line;

the first conductor of the coaxial cable is connected with the metal sheet, and the second conductor of the coaxial cable is connected with the conductor of the second side of the double-sided parallel strip line through the through hole in the substrate.

2. The antenna of claim 1, wherein the diameter of the maximum inscribed circle of the metal sheet is 0.18 to 0.5 times the waveguide wavelength of the electromagnetic wave of the operating frequency of the horizontally polarized antenna in the double-sided parallel strip line.

3. The antenna of claim 1 or 2, wherein the horizontally polarized antenna further comprises: a first feeding point at the first side and a second feeding point at the second side;

the second conductor of the coaxial cable is connected with the first feeding point, the first feeding point is connected with the second feeding point through the through hole, and the second feeding point is connected with the conductor of the double-sided parallel strip line on the second side.

4. The antenna of any one of claims 1 to 3, wherein the metal sheet has a through hole, and the horizontally polarized antenna further comprises: a stub located on the first side and within the via;

the stub is connected to a second conductor of the coaxial cable.

5. The antenna according to claim 4, wherein the first feeding point is located in the through hole, the first feeding point and the stub are of a unitary structure, and a shape of the through hole is the same as an orthographic projection of the unitary structure on the substrate.

6. The antenna of claim 5, wherein a distance between the first feeding point and the through hole, and a distance between the stub and the through hole are each greater than or equal to 0.1 mm and less than or equal to 2 mm.

7. An antenna according to any one of claims 1 to 6, wherein the metal sheet is disc-shaped.

8. An antenna according to any of claims 1 to 7, characterized in that the radiating element is a dipole element.

9. The antenna of any one of claims 1 to 8, wherein the first conductor of the coaxial cable is an outer conductor of the coaxial cable and the second conductor of the coaxial cable is an inner conductor of the coaxial cable.

10. A communication device, characterized in that the communication device comprises: radio frequency circuitry and an antenna as claimed in any one of claims 1 to 9;

the radio frequency circuit is connected with a coaxial cable in the antenna.

Technical Field

The present application relates to the field of antenna technology, and in particular, to an antenna and a communication device.

Background

In a Wireless Local Area Network (WLAN) service, in order to increase a signal bandwidth of an Access Point (AP), more antennas may be integrated in the AP to increase the number of signal streams, and a combination of antennas with different polarizations may be used in the AP to reduce channel correlation. For example, the AP may employ a horizontally polarized antenna and a vertically polarized antenna in a superimposed arrangement.

To reduce the height of the antenna to achieve a low profile design of the antenna, the distance between the horizontally polarized antenna and the vertically polarized antenna is typically closer.

However, since the horizontally polarized antenna is generally fed by a coaxial cable, the coaxial cable generates an induced current during feeding, and the induced current may interfere with signals received and transmitted by the vertically polarized antenna, i.e., the isolation between the horizontally polarized antenna and the vertically polarized antenna is low.

Disclosure of Invention

The application provides an antenna and communication equipment, can solve the lower problem of isolation between horizontal polarization antenna and the vertical polarization antenna, technical scheme is as follows:

in one aspect, an antenna is provided, including: the antenna of horizontal polarization and vertical polarization that the stack set up, this horizontal polarization antenna includes: the antenna comprises a substrate, at least one radiating element, at least one double-sided parallel strip line (DSPSL), a metal sheet and a coaxial cable, wherein the metal sheet and the coaxial cable are positioned on a first side of the substrate, and the first side is the side of the substrate, which is far away from the vertical polarization antenna; the double-sided parallel strip line is connected with the radiation oscillator; the metal sheet is connected with the conductor of the double-sided parallel strip line on the first side, and the diameter of the maximum inscribed circle of the metal sheet is larger than the line width of the double-sided parallel strip line; the first conductor of the coaxial cable is connected with the metal sheet, and the second conductor of the coaxial cable is connected with the conductor of the double-sided parallel strip line on the second side through the through hole on the substrate.

Because the diameter of the maximum inscribed circle of the metal sheet is larger than the line width of the double-sided parallel strip line, and the metal sheet and the coaxial cable are both positioned on the first side of the substrate, the metal sheet can inhibit induced current in the coaxial cable, and the influence of the induced current on the vertical polarization antenna can be reduced.

Optionally, the diameter of the maximum inscribed circle of the metal sheet is 0.18 to 0.5 times the waveguide wavelength of the electromagnetic wave of the operating frequency of the horizontally polarized antenna in the double-sided parallel strip line, so that the metal sheet can be ensured to be capable of effectively suppressing the induced current in the coaxial cable, thereby increasing the isolation between the horizontally polarized antenna and the vertically polarized antenna.

Optionally, the horizontally polarized antenna further comprises: a first feeding point at the first side and a second feeding point at the second side; the second conductor of the coaxial cable is connected with the first feeding point, the first feeding point is connected with the second feeding point through the through hole, and the second feeding point is connected with the conductor of the double-sided parallel strip line on the second side.

The connection of the second conductor of the coaxial cable to the conductor of the double-sided parallel strip line on the second side can be facilitated by designing the first feeding point on the first side and the second feeding point on the second side.

Optionally, the metal sheet has a through hole, and the horizontally polarized antenna further includes: the stub line is positioned on the first side and positioned in the through hole; the stub is connected to the second conductor of the coaxial cable. The stub may be used to adjust the impedance of the horizontally polarized antenna.

Optionally, the first feeding point is located in the through hole, the first feeding point and the stub are an integral structure, and the shape of the through hole is the same as the shape of an orthographic projection of the integral structure on the substrate. And a gap exists between the integrated structure and the through hole, namely the integrated structure is insulated from the metal sheet.

Through the through-hole that the design shape is the same with the shape of this body structure, can avoid increasing the size of this through-hole under the prerequisite of guaranteeing that body structure can set up in the through-hole, guarantee that this sheetmetal can effectively restrain the induced-current in the coaxial cable.

Optionally, a distance between the first feeding point and the through hole, and a distance between the stub and the through hole are both greater than or equal to 0.1 mm and less than or equal to 2 mm.

Optionally, the metal sheet is disc-shaped, and the metal sheet may also be referred to as a feed pad.

Optionally, the radiating element is a dipole element. The vertically polarized antenna may be a monopole antenna.

Optionally, the first conductor of the coaxial cable is an outer conductor of the coaxial cable and the second conductor of the coaxial cable is an inner conductor of the coaxial cable.

In another aspect, there is provided a communication apparatus including: radio frequency circuitry and an antenna as provided in the above aspects; the radio frequency circuit is connected to a coaxial cable in the antenna to feed a horizontally polarized antenna in the antenna.

To sum up, this application provides an antenna and communication equipment, and in the scheme that this application provided, this antenna includes horizontal polarization antenna and vertical polarization antenna, and this horizontal polarization antenna includes the sheetmetal, and this sheetmetal can be connected with the two-sided parallel band line in the horizontal polarization antenna and coaxial cable's first conductor respectively. Because the diameter of the maximum inscribed circle of the metal sheet is larger than the line width of the double-sided parallel strip line, and the metal sheet and the coaxial cable are both positioned on the first side of the substrate, the metal sheet can effectively inhibit induced current in the coaxial cable, and therefore the influence of the induced current on the vertical polarization antenna can be reduced. The scheme provided by the embodiment of the application can effectively improve the isolation between the horizontal polarization antenna and the vertical polarization antenna on the premise of avoiding increasing the overall height of the antenna.

Drawings

Fig. 1 is a schematic structural diagram of an antenna provided in an embodiment of the present application;

fig. 2 is a top view of a first side of a horizontally polarized antenna provided in an embodiment of the present application;

fig. 3 is a top view of a second side of a horizontally polarized antenna provided in an embodiment of the present application;

fig. 4 is a schematic partial structure diagram of a horizontally polarized antenna provided in an embodiment of the present application;

fig. 5 is a cross-sectional view of a horizontally polarized antenna provided in an embodiment of the present application;

fig. 6 is a top view of a first side of another horizontally polarized antenna provided by an embodiment of the present application;

fig. 7 is a partial schematic diagram of a first side of a horizontally polarized antenna according to an embodiment of the present application;

fig. 8 is a partial structural schematic diagram of another horizontally polarized antenna provided in an embodiment of the present application;

fig. 9 is a cross-sectional view of another horizontally polarized antenna provided in an embodiment of the present application;

fig. 10 is a top view of a first side of yet another horizontally polarized antenna provided by an embodiment of the present application;

fig. 11 is a top view of a first side of yet another horizontally polarized antenna provided by an embodiment of the present application;

fig. 12 is a simulation diagram of isolation between a horizontally polarized antenna and a vertically polarized antenna according to an embodiment of the present application;

fig. 13 is a schematic structural diagram of a communication device according to an embodiment of the present application.

Detailed Description

The following describes an antenna and a communication device provided in embodiments of the present application in detail with reference to the accompanying drawings.

An embodiment of the present application provides an antenna, as shown in fig. 1, the antenna includes: a horizontally polarized antenna 01 and a vertically polarized antenna 02 are arranged in a superimposed manner. Fig. 2 is a top view of a first side of a horizontally polarized antenna provided in an embodiment of the present application, and fig. 3 is a top view of a second side of the horizontally polarized antenna provided in an embodiment of the present application, as shown in fig. 1 to fig. 3, the horizontally polarized antenna 01 includes: a substrate 011, at least one radiating vibrator 012, at least one double-sided parallel strip line 013, and a metal sheet 014 and a coaxial cable 015 positioned on a first side of the substrate 011. Wherein, at least one means one or more, and a plurality means two or more. For example, fig. 1 to 3 show four radiating elements 012 and four double-sided parallel strip lines 013. The first side refers to a side of the substrate 011 away from the vertically polarized antenna 02.

In the present embodiment, the horizontally polarized antenna 01 includes the same number of strip lines 013 as the number of radiating elements 012, and each strip line 013 is connected to one radiating element 012.

As can be seen in conjunction with fig. 2 and 3, each double-sided parallel strip line 013 includes a conductor 0131 on a first side of the substrate 011 and a conductor 0132 on a second side of the substrate 011. The conductor 0131 and the conductor 0132 have the same shape and the same line width, that is, the orthographic projection of the conductor 0131 on the substrate 011 is overlapped with the orthographic projection of the conductor 0132 on the substrate 011. The second side is parallel to the first side, and the second side is a side of the substrate 011 close to the vertically polarized antenna 02.

As shown in fig. 2, the metal piece 014 is connected to the conductor 0131 of the double-sided parallel strip line 013 on the first side, and the diameter d1 of the maximum inscribed circle of the metal piece 014 is larger than the line width w of the double-sided parallel strip line 013, that is, the size of the metal piece 014 is designed to be larger. If the line widths of the respective portions of the double-sided parallel strip line 013 are not uniform, the diameter d1 of the maximum inscribed circle of the metal piece 014 is larger than the maximum line width of the double-sided parallel strip line 013.

If the orthographic projection of the metal sheet 014 on the substrate 011 is a circle, the maximum inscribed circle of the metal sheet 014 is the circle. If the orthographic projection of the metal sheet 014 on the substrate 011 is an ellipse, the maximum inscribed circle of the metal sheet 014 is a circle formed by taking the center of the ellipse as the center and taking the short axis of the ellipse as the radius. If the orthographic projection of the metal sheet 014 on the substrate 011 is a polygon, the maximum inscribed circle of the metal sheet 014 refers to the circle with the largest area among circles which are positioned in the polygon and tangent to at least one side of the polygon.

Fig. 4 is a partial structural schematic diagram of a horizontally polarized antenna provided in an embodiment of the present application, and fig. 5 is a cross-sectional view of the horizontally polarized antenna provided in the embodiment of the present application. Referring to fig. 4 and 5, the first conductor 0151 of the coaxial cable 015 is connected to the metal plate 014, for example, the first conductor 0151 may be welded to the metal plate 014. The second conductor 0152 of the coaxial cable 015 is connected with the conductor 0132 of the second side of the double-sided parallel strip line 013 through the via 0111 on the substrate 011. The via 0111 may be a metallization hole.

In the embodiment of the present application, the first conductor 0151 of the coaxial cable 015 refers to one of the inner conductor and the outer conductor, and the second conductor 0152 refers to the other of the inner conductor and the outer conductor. Also, referring to fig. 4 and 5, the coaxial cable 015 further includes an insulating layer 0153 between the inner and outer conductors, and an outer jacket (not shown in fig. 4 and 5) covering the outer conductor.

Since the metal plate 014 and the coaxial cable 015 are both located on the first side of the substrate, and the first conductor 0151 of the coaxial cable 015 is connected to the metal plate 014, the distance between the part of the coaxial cable 015 located in the area of the metal plate 014 and the metal plate 014 is short, for example, the outer sheath of the coaxial cable 015 can be tightly attached to the metal plate 014. The metal plate 014 couples the induced current on the coaxial cable 015, that is, a coupling current can be generated in the metal plate 014, and the coupling current can suppress the induced current of the coaxial cable 015, thereby reducing the influence of the coaxial cable 015 on the vertically polarized antenna 02, that is, improving the isolation between the horizontally polarized antenna 01 and the vertically polarized antenna 02.

Since the metal piece 014 is also connected to the conductor 0131 of the double-sided parallel strip line 013 on the first side of the substrate 011, the amplitude and phase of the coupling current generated in the metal piece 014 depend on the operating frequency of the antenna, the size of the metal piece 014, and the length of the double-sided parallel strip line 013. In this embodiment, after the operating frequency of the horizontally polarized antenna 01 and the length of the double-sided parallel strip line 013 are determined, the size of the metal sheet 014 is designed reasonably to ensure that the isolation between the horizontally polarized antenna 01 and the vertically polarized antenna 02 at each frequency point of the operating frequency of the antenna can meet the isolation requirement.

In summary, the present application provides an antenna including a horizontally polarized antenna and a vertically polarized antenna, where the horizontally polarized antenna includes a metal sheet, and the metal sheet can be connected to a double-sided parallel strip line in the horizontally polarized antenna and a first conductor of a coaxial cable, respectively. Because the diameter of the maximum inscribed circle of the metal sheet is larger than the line width of the double-sided parallel strip line, and the metal sheet and the coaxial cable are both positioned on the first side of the substrate, the metal sheet can effectively inhibit induced current in the coaxial cable, and therefore the influence of the induced current on the vertical polarization antenna can be reduced. The scheme provided by the embodiment of the application can effectively improve the isolation between the horizontal polarization antenna and the vertical polarization antenna on the premise of avoiding increasing the overall height of the antenna.

In the embodiment of the present application, each radiating element 012 is a double-sided printed radiating element, and as can be seen with reference to fig. 2 to 4, each radiating element 012 includes a first vibrating arm 0121 located on a first side of the substrate 011 and a second vibrating arm 0122 located on a second side of the substrate 011. The first vibrating arm 0121 is connected to the conductor 0131 of the double-sided parallel strip line 013 located on the first side of the substrate 011, and the second vibrating arm 0122 is connected to the conductor 0132 of the double-sided parallel strip line 013 located on the second side of the substrate 011.

Accordingly, the coaxial cable 015 can feed the first vibrating arm 0121 of the radiating element 012 through the metal sheet 015 and the conductor 0131 of the double-sided parallel strip line 013 on the first side, and can feed the second vibrating arm 0122 of the radiating element 012 through the conductor 0132 of the double-sided parallel strip line 013 on the second side.

Optionally, the diameter of the maximum inscribed circle of the metal plate 014 is 0.18 times to 0.5 times of the waveguide wavelength of the electromagnetic wave of the operating frequency of the horizontally polarized antenna 01 in the double-sided parallel strip line 013. The diameter range can ensure that at each frequency point of the working frequency of the antenna, the coupling current generated in the metal sheet 014 can effectively inhibit the induced current in the coaxial cable 015, so that at each frequency point of the working frequency of the antenna, the isolation between the horizontally polarized antenna 01 and the vertically polarized antenna 02 can meet the requirement of the isolation.

The waveguide wavelength is a wavelength at which an electromagnetic wave of an operating frequency of the horizontally polarized antenna 01 is transmitted in the medium of the two-sided parallel strip line 013 when the horizontally polarized antenna 01 operates. The waveguide wavelength is related to an operating frequency (i.e., a frequency of an electromagnetic wave) of the horizontally polarized antenna 01, a line width of the double-sided parallel strip line 013, a dielectric constant of the substrate 011, and a thickness of the substrate 011. The line width of the double-sided parallel strip line 013 has relatively small influence on the waveguide wavelength, so that the influence of the line width difference of each part of the double-sided parallel strip line 013 on the waveguide wavelength is negligible.

Alternatively, referring to fig. 3 to 5, the horizontally polarized antenna 01 may further include: a first feeding point 016 located at a first side of the substrate 011, and a second feeding point 017 located at a second side of the substrate 011.

The second conductor 0152 of the coaxial cable 015 is connected to the first feeding point 016, for example, the second conductor 0152 is welded to the first feeding point 016. The first feeding point 016 is connected to the second feeding point 017 through the via 0111, and the second feeding point 017 is connected to the conductor 0132 of the double-sided parallel strip line 013 on the second side. That is, the second conductor 0152 of the coaxial cable 015 can be connected to the conductor 0132 of the second side of the double-sided parallel strip line 013 through the first feeding point 016 and the second feeding point 017.

The second conductor 0152 of the coaxial cable 015 can be conveniently connected with the conductor 0132 of the double-sided parallel strip line 013 at the second side by designing the first feeding point 016 at the first side and the second feeding point 017 at the second side.

Fig. 6 is a schematic structural diagram of a first side of another horizontally polarized antenna provided in this embodiment of the application, and as can be seen from fig. 4 and 6, a through hole 0141 is formed in the metal sheet 014, and the horizontally polarized antenna 01 may further include a stub 018 located on the first side of the substrate 011 and within the through hole 0141. The stub 018 is connected to a second conductor 0152 of the coaxial cable 015. The stub 018 can be used to adjust the impedance of the horizontally polarized antenna 01.

In the embodiment of the present application, the impedance of the horizontally polarized antenna 01 can be adjusted by adjusting the length of the stub 018. For example, when designing the horizontally polarized antenna 01, a stub 018 having a long length may be designed on the substrate 011. The impedance of the horizontally polarized antenna 01 may be different for each batch due to factors such as the manufacturing process. Therefore, after the horizontally polarized antenna 01 is produced as designed, the impedance of the horizontally polarized antenna 01 can be tested. If the impedance of the horizontally polarized antenna 01 does not meet the design requirement, the length of the stub 018 of the batch of produced horizontally polarized antennas 01 can be shortened according to the test result, for example, a part of the stub 018 can be ground away, thereby realizing flexible adjustment of the impedance of the horizontally polarized antenna 01.

With continued reference to fig. 4 and 6, the first feeding point 016 is located in the through hole 0141, and the first feeding point 016 and the stub 018 are an integral structure. The shape of the through hole 0141 may be the same as the shape of the orthographic projection of the integrated structure on the substrate 011, and there is a gap between the integrated structure and the through hole 0141, i.e. the integrated structure is insulated from the metal sheet 014.

Through the through-hole that the design shape is the same with the shape of this body structure, can be guaranteeing that body structure can set up in the through-hole and with the insulating prerequisite of this sheetmetal under, avoid increasing the size of this through-hole, guarantee that this sheetmetal can effectively restrain the induced-current in the coaxial cable.

In the embodiment of the present application, as shown in fig. 7, a distance d2 between the first feeding point 016 and the through hole 0141, and a distance d3 between the stub 018 and the through hole 0141 are both greater than or equal to 0.1 mm and less than or equal to 2 mm.

As an alternative implementation, as shown in fig. 4 and 5, the first conductor 0151 of the coaxial cable 015 is an outer conductor of the coaxial cable 015, and the second conductor 0152 of the coaxial cable 015 is an inner conductor of the coaxial cable 015. That is, the outer conductor of the coaxial cable 015 is connected to the conductor 0131 with the double-sided parallel strip line 013 on the first side through the metal piece 014. The inner conductor of the coaxial cable 015 is connected to the conductor 0132 of the double-sided parallel strip line 013 on the second side through the first feeding point 016, the via 0111 and the second feeding point 017.

As another alternative implementation, as shown in fig. 8, 9 and 10, the first conductor 0151 of the coaxial cable 015 is an inner conductor of the coaxial cable 015, and the second conductor 0152 of the coaxial cable 015 is an outer conductor of the coaxial cable 015. That is, the inner conductor of the coaxial cable 015 is connected to the conductor 0131 with the double-sided parallel strip line 013 on the first side through the metal piece 014. The outer conductor of the coaxial cable 015 is connected to the conductor 0132 of the double-sided parallel strip line 013 on the second side through the first feeding point 016, the via 0111 and the second feeding point 017.

In the embodiment of the present application, the metal plate 014 may be disc-shaped, that is, the orthographic projection of the metal plate 014 on the substrate 011 is circular. Of course, the metal sheet 014 may have other shapes, and for example, the orthographic projection of the metal sheet 014 on the substrate 011 may be a polygon such as a triangle or a rectangle. Alternatively, in order to ensure the symmetry of the whole structure of the antenna, the orthogonal projection of the metal sheet 014 on the substrate 011 can be a regular polygon. For example, it may be a square as shown in fig. 7, the diameter d1 of the maximum inscribed circle of the square being larger than the line width of the double-sided parallel strip line 013.

Alternatively, as shown in fig. 3, 4, 6 and 7, the first feeding point 016 and the second feeding point 017 may both be circular disks, i.e., orthographic projections of the first feeding point 016 and the second feeding point 017 on the substrate 011 are both circular. Alternatively, the first and second feeding points 016 and 017 may have other shapes. For example, referring to fig. 10, the orthogonal projection of the first feeding point 016 on the substrate 011 can also be rectangular. Also, the diameter of the maximum inscribed circle of the first feeding point 016 and the diameter of the maximum inscribed circle of the second feeding point 017 are both larger than the diameter of the via 0111. Therefore, the first feeding point 016 and the second feeding point 017 can be effectively connected through the via 0111.

In the present embodiment, the number of the at least one radiating element 012 included in the horizontally polarized antenna 01 may be greater than 1. For example, the number of the at least one radiating element 012 may be greater than or equal to 3. The at least one radiator element 012 is symmetrical about the center point of the metal piece 014. The center point of the metal plate 014 may refer to the center of the maximum inscribed circle of the metal plate 014.

For example, as shown in fig. 1 to 4, the horizontally polarized antenna may include 4 radiating elements 012, and the 4 radiating elements 012 are centered symmetrically with respect to a center point of the metal sheet 014.

In the embodiment of the present application, if the number of the radiating elements 012 included in the horizontally polarized antenna 01 is N (N is an integer greater than 1), the horizontally polarized antenna 01 may also be referred to as an N-element antenna. Accordingly, the horizontally polarized antenna 01 includes N double-sided parallel strip lines 013, and the N double-sided parallel strip lines 013 can constitute a feeding network to transfer the energy transmitted by the coaxial cable 015 to the N radiating elements 012, thereby feeding the N radiating elements 012.

Since the energy transmitted by the coaxial cable 015 can be transmitted to the N double-sided parallel striplines 013 through the metal plate 014, the first feeding point 016 and the second feeding point 017, respectively, the metal plate 014, the first feeding point 016 and the second feeding point 017 can form a one-to-N power divider. The one-to-N power divider can divide the energy transmitted by the coaxial cable 015 into N paths, and transmit the N paths of energy to the N double-sided parallel strip lines 013 respectively.

In the embodiment of the present application, the line width of both ends of each of the double-sided parallel strip lines 013 may be smaller than the line width of the middle portion. For example, as shown in fig. 3, a line width w1 of the double-sided parallel strip line 013 for connecting one end of the radiating element 012 may be smaller than a line width w3 of the middle portion and may be larger than a line width w2 of the double-sided parallel strip line 013 for connecting one end of the coaxial cable 015, that is, the line widths of the parts of the double-sided parallel strip line 013 satisfy: w3 > w1 > w 2.

By designing the line widths of the respective portions of the double-sided parallel strip line 013, impedance matching of the horizontally polarized antenna 01 can be achieved.

In the embodiment of the present application, each of the radiating elements 012 may be a dipole element. Referring to fig. 1 to 3, and fig. 6, the dipole oscillator 012 includes a first vibrating arm 0121 and a second vibrating arm 0122 arranged axisymmetrically with respect to the axis of a double-sided parallel strip line 013, that is, the first vibrating arm 0121 and the second vibrating arm 0122 extend in opposite directions.

Of course, the radiating element 012 may be another type of radiating element, for example, a slot radiating element, that is, the horizontally polarized antenna 01 may be a slot antenna.

Alternatively, the vertically polarized antenna 02 may be a monopole antenna. The operating frequency bands of the horizontally polarized antenna 01 and the vertically polarized antenna 02 may both be 5 gigahertz (GHz) frequency bands.

Fig. 11 is a schematic structural diagram of a first side of another horizontally polarized antenna provided in an embodiment of the present application, and as shown in fig. 11, the horizontally polarized antenna 01 may further include: a plurality of directors 019 and a plurality of reflectors 020, which may be used to adjust the pattern of the horizontally polarized antenna. The directors 019 and the reflectors 020 are located on the first side of the substrate 011 and are uniformly arranged around the radiating element 012.

For example, 4 directors 019 and 4 reflectors 020 are shown in fig. 11.

The embodiments of the present application also respectively simulate the isolation between the horizontally polarized antenna and the vertically polarized antenna in the conventional scheme (i.e., the scheme without using a metal sheet) and the scheme provided by the embodiments of the present application. The simulation parameters are as follows: the horizontally polarized antenna and the vertically polarized antenna both operate in a 5G frequency band, the length of the double-sided parallel strip line 013 is 0.48 times the waveguide wavelength, and the metal plate 014 is disc-shaped and has a diameter of 0.2 times the waveguide wavelength. The simulation results are shown in fig. 12. In fig. 12, the horizontal axis represents the frequency of the antenna in GHz, and the vertical axis represents the S21 parameter. The S21 parameter is a ratio of a power of a signal received by a vertically polarized antenna to a power transmitted by a horizontally polarized antenna when the horizontally polarized antenna transmits the signal. The negative value of the S21 parameter is the isolation between the horizontally polarized antenna and the vertically polarized antenna. Referring to fig. 12, when the horizontally polarized antenna and the vertically polarized antenna operate in the 5G frequency band, at different frequency points of the 5G frequency band, the S21 parameter between the horizontally polarized antenna and the vertically polarized antenna is different, that is, at different frequency points, the two antennas have different isolation degrees.

Wherein, with the conventional feeding scheme, the S21 parameter between the horizontally polarized antenna and the vertically polarized antenna is about 22.6 decibels (dB) or less, i.e., the minimum isolation between the horizontally polarized antenna and the vertically polarized antenna is about 22.6 dB. By adopting the scheme provided by the embodiment of the application, the S21 parameter between the horizontal polarization antenna and the vertical polarization antenna can be ensured to be less than or equal to-26 dB, namely, the isolation between the horizontal polarization antenna and the vertical polarization antenna can be ensured to be greater than or equal to 26 dB. The minimum isolation between the horizontally polarized antenna and the vertically polarized antenna is improved by at least 3dB compared to conventional solutions.

In summary, the present application provides an antenna including a horizontally polarized antenna and a vertically polarized antenna, where the horizontally polarized antenna includes a metal sheet, and the metal sheet can be connected to a double-sided parallel strip line in the horizontally polarized antenna and a first conductor of a coaxial cable, respectively. Because the diameter of the maximum inscribed circle of the metal sheet is larger than the line width of the double-sided parallel strip line, and the metal sheet and the coaxial cable are both positioned on the first side of the substrate, the metal sheet can effectively inhibit induced current in the coaxial cable, and therefore the influence of the induced current on the vertical polarization antenna can be reduced. The scheme provided by the embodiment of the application can effectively improve the isolation between the horizontal polarization antenna and the vertical polarization antenna on the premise of avoiding increasing the overall height of the antenna.

An embodiment of the present application further provides a communication device, as shown in fig. 13, where the communication device includes: an antenna 10 and radio frequency circuitry 20. The antenna 10 is an antenna provided in the above embodiments, and may be an antenna as shown in any one of fig. 1 to 11.

As shown in fig. 13, the rf circuit 20 may be connected to a coaxial cable 015 in the antenna 10, and the rf circuit 20 is used for feeding the horizontally polarized antenna 01 in the antenna 10 through the coaxial cable 015.

Optionally, as shown in fig. 1, the antenna may further include a metal plate 03, where the metal plate 03 is a ground plate. A vertically polarized antenna 02 may be provided on the metal plate 03. One end of the coaxial cable 015 for connecting the horizontally polarized antenna 01 is located on the first side of the substrate 011, and the other end of the coaxial cable 015 is bent to the surface of the metal plate 03. The other end of the coaxial cable 015 may extend along the surface of the metal plate 03 and be connected to the rf circuit 20.

In the present embodiment, the vertically polarized antenna 02 is also connected to the rf circuit 20. For example, as shown in fig. 13, the vertically polarized antenna 02 is also connected to the radio frequency circuit 20 through a coaxial cable 015. Alternatively, the antenna 10 may further include a transmission line printed on the metal plate 03, and the vertically polarized antenna 02 may be connected to the radio frequency circuit 20 through the transmission line.

Alternatively, the communication device may be an AP or a base station.

In summary, the embodiment of the present application provides a communication device, which includes an antenna. Because horizontal polarization antenna and vertical polarization antenna in this antenna can realize higher isolation under the prerequisite of less interval, consequently can avoid increasing this communication equipment's thickness, be convenient for realize the miniaturized design of product.