阅读说明：本技术 双频段定向天线 (Dual-band directional antenna ) 是由 王剑 李鑫 张书俊 王勇 于 2018-07-13 设计创作，主要内容包括：本发明公开了一种双频段定向天线,包括天线辐射体以及金属反射板；所述天线辐射体包括基板,设置于所述基板第一面的天线馈电层,以及设置于所述基板第二面的辐射单元层；其中,所述辐射单元层包括高频单元和低频单元；所述天线馈电层包括与所述高频单元连通的第一接地点,与高频单元耦合馈电的第一微带天线,与低频单元连通的第二接地点,以及与所述低频单元耦合馈电的第二微带天线。本发明设计了一种低剖面的双频段定向天线,采用微带耦合馈电的阵列天线形式,能在双频范围内实现信号的远距离传输通信,具有低剖面、宽频带、高增益和定向辐射的优点,并且结构简单易于加工,可以很好的应用于多种频段信号的收发,并适用于更多的场合。(The invention discloses a dual-band directional antenna, which comprises an antenna radiator and a metal reflecting plate, wherein the antenna radiator is arranged on the upper surface of the metal reflecting plate; the antenna radiator comprises a substrate, an antenna feed layer arranged on a first surface of the substrate and a radiation unit layer arranged on a second surface of the substrate; wherein the radiation unit layer comprises a high frequency unit and a low frequency unit; the antenna feed layer comprises a first grounding point communicated with the high-frequency unit, a first microstrip antenna coupled with the high-frequency unit for feeding, a second grounding point communicated with the low-frequency unit, and a second microstrip antenna coupled with the low-frequency unit for feeding. The invention designs a low-profile dual-band directional antenna, which adopts a micro-strip coupling feed array antenna form, can realize the remote transmission communication of signals in a dual-band range, has the advantages of low profile, wide band, high gain and directional radiation, has simple structure and easy processing, can be well applied to the receiving and transmitting of signals in various frequency bands, and is suitable for more occasions.)

1. A dual-band directional antenna, comprising: the antenna comprises an antenna radiator and a metal reflecting plate assembled on the antenna radiator; the antenna radiator comprises a substrate, an antenna feed layer arranged on a first surface of the substrate and a radiation unit layer arranged on a second surface of the substrate;

wherein the radiation unit layer comprises a high frequency unit and a low frequency unit; the antenna feed layer comprises a first grounding point communicated with the high-frequency unit, a first microstrip antenna coupled with the high-frequency unit for feeding, a second grounding point communicated with the low-frequency unit, and a second microstrip antenna coupled with the low-frequency unit for feeding.

2. The dual band directional antenna of claim 1, wherein the first microstrip antenna and the second microstrip antenna are both L-branches.

3. Dual band directional antenna according to claim 1 or 2, characterized in that the first grounding point and the second grounding point are metallized through holes.

4. The dual band directional antenna of claim 3, further comprising a first coaxial line connecting the first ground point and the first microstrip antenna, and a second coaxial line connecting the second ground point and the second microstrip antenna; the first coaxial line and the second coaxial line are arranged in the substrate;

the first coaxial grounding layer is connected with the first grounding point, and the first coaxial feeding layer is connected with the first microstrip antenna; the grounding layer of the second coaxial line is connected with the second grounding point, and the feeding layer of the second coaxial line is connected with the second microstrip antenna.

5. The dual band directional antenna of claim 1, wherein said high frequency element comprises two first array antennas and said low frequency element comprises two second array antennas; the two first array antennas are symmetrically arranged in parallel, and the two second array antennas are symmetrically arranged in parallel.

6. The dual band directional antenna of claim 5, wherein the first array antenna comprises a first connection line, a high frequency radiating arm connected to both ends of the first connection line, and a high frequency feed ground point; the high-frequency feeding grounding point is arranged on any one of the first connecting lines and is conducted with the first grounding point.

7. The dual band directional antenna of claim 5, wherein the second array antenna comprises a second connection, a low frequency radiating arm connected across the second connection, and a low frequency feed ground point; the low-frequency feed grounding point is arranged on any one of the second connecting lines and is conducted with the second grounding point.

8. The dual band directional antenna of claim 7, wherein said low frequency radiating arm is disposed in a meander.

9. The dual band directional antenna of claim 1, wherein the metal reflector is mounted to the second side of the substrate, and the metal reflector comprises a folded structure extending around the second side.

10. The dual band directional antenna of claim 1 or 9, further comprising a connection mechanism by which the substrate is connected to the metal reflector plate.

Technical Field

The invention relates to the technical field of wireless communication, in particular to a dual-band directional antenna.

Background

The antenna plays an important role in transmitting and receiving electromagnetic waves in a wireless communication system, and is responsible for converting a high-frequency current (guided wave energy) into a wireless electromagnetic wave or vice versa, in addition to efficiently radiating or receiving the electromagnetic wave. The antenna undoubtedly plays an important role which is most basic and most indispensable, and the performance of the antenna directly affects the quality of the whole communication system.

In order to improve the flexibility and usability of the system, directional radiation antennas capable of simultaneously operating in two or more specific frequency bands are urgently needed in the market. However, some multi-frequency antennas in the current market mostly adopt a laminated structure scheme or PIFA antennas, and the antenna section is large, so that the size of the antenna is increased; most directional antennas have the defects of small impedance bandwidth, complex structure, difficult processing, difficult consistency guarantee and the like.

Disclosure of Invention

In view of the above, the present invention provides a high-gain dual-band directional antenna to solve the above technical problems.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

according to an embodiment of the present invention, there is provided a dual band directional antenna, including: the antenna comprises an antenna radiator and a metal reflecting plate assembled on the antenna radiator; the antenna radiator comprises a substrate, an antenna feed layer arranged on a first surface of the substrate and a radiation unit layer arranged on a second surface of the substrate;

wherein the radiation unit layer comprises a high frequency unit and a low frequency unit; the antenna feed layer comprises a first grounding point communicated with the high-frequency unit, a first microstrip antenna coupled with the high-frequency unit for feeding, a second grounding point communicated with the low-frequency unit, and a second microstrip antenna coupled with the low-frequency unit for feeding.

The further improvement of the dual-band directional antenna is that the first microstrip antenna and the second microstrip antenna are both L-shaped branches.

A further improvement of the dual band directional antenna of the present invention is that the first and second grounding points are metalized vias.

A further improvement of the dual band directional antenna of the present invention is that the dual band directional antenna further comprises a first coaxial line connecting the first grounding point and the first microstrip antenna, and a second coaxial line connecting the second grounding point and the second microstrip antenna; the first coaxial line and the second coaxial line are arranged in the substrate;

the first coaxial grounding layer is connected with the first grounding point, and the first coaxial feeding layer is connected with the first microstrip antenna; the grounding layer of the second coaxial line is connected with the second grounding point, and the feeding layer of the second coaxial line is connected with the second microstrip antenna.

A further improvement of the dual band directional antenna of the present invention is that the high frequency unit comprises two first array antennas and the low frequency unit comprises two second array antennas; the two first array antennas are symmetrically arranged in parallel, and the two second array antennas are symmetrically arranged in parallel.

The further improvement of the dual-band directional antenna of the invention is that the first array antenna comprises a first connecting circuit, high-frequency radiating arms connected to both ends of the first connecting circuit, and a high-frequency feeding grounding point; the high-frequency feeding grounding point is arranged on any one of the first connecting lines and is conducted with the first grounding point.

A further improvement of the dual band directional antenna of the present invention is that the second array antenna comprises a second connection line, a low frequency radiating arm connected to both ends of the second connection line, and a low frequency feed ground point; the low-frequency feed grounding point is arranged on any one of the second connecting lines and is conducted with the second grounding point.

The dual-band directional antenna is further improved in that the low-frequency radiating arm is arranged in a bent mode.

The dual-band directional antenna is further improved in that the metal reflector is assembled on the second surface of the substrate, and the metal reflector comprises a covered edge structure which is bent around and extends to the second surface.

A further improvement of the dual band directional antenna of the present invention is that the dual band directional antenna further comprises a connection mechanism, and the substrate is connected to the metal reflection plate through the connection mechanism.

The technical scheme provided by the embodiment of the invention can have the following beneficial effects: the invention designs a low-profile dual-band directional antenna, which adopts an array antenna form of dual-port input and microstrip coupling feed and can realize remote transmission communication of signals in a dual-frequency range. The invention has the advantages of low profile, wide frequency band, high gain and directional radiation on the basis of the characteristic of double frequency, has simple structure and easy processing, can be well applied to the receiving and transmitting of signals in various frequency bands, and is suitable for more occasions.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

Drawings

Fig. 1 is an assembled schematic view of a dual band directional antenna according to an exemplary embodiment of the present invention;

fig. 2 is a schematic structural diagram of a first side of a substrate in a dual-band directional antenna according to an exemplary embodiment of the present invention;

fig. 3 is a schematic structural diagram of a second surface of a substrate in a dual-band directional antenna according to an exemplary embodiment of the present invention;

fig. 4 is a schematic diagram illustrating an S-parameter test structure of a low-frequency line array unit according to an exemplary embodiment of the present invention;

fig. 5 is a schematic diagram illustrating an S-parameter test structure of a high-frequency line array unit according to an exemplary embodiment of the present invention;

fig. 6 is a schematic diagram illustrating a directional pattern test data structure of a low-frequency line array unit according to an exemplary embodiment of the present invention;

fig. 7 is a schematic diagram illustrating a directional pattern test data structure of a high-frequency line array unit according to an exemplary embodiment of the present invention;

FIG. 8 is a diagram illustrating a test data structure for high and low frequency bin heights in accordance with an exemplary embodiment of the present invention.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

In the following, some embodiments of the present invention will be described in detail with reference to the accompanying drawings, and features in the following examples and examples may be combined with each other without conflict.

As shown in fig. 1 to 3, a dual band directional antenna 100 according to an embodiment of the present invention includes: an antenna radiator 10, and a metal reflection plate 20 mounted on the antenna radiator 10. The antenna radiator 10 includes a substrate 11, an antenna feed layer disposed on a first surface 111 of the substrate 11, and a radiation unit layer disposed on a second surface 112 of the substrate 11. The radiation unit layer includes a high frequency unit 12 and a low frequency unit 13, and the high frequency unit 12 and the low frequency unit 13 are respectively disposed in two adjacent areas divided on the substrate 11.

In this embodiment, the first surface 111 and the second surface 112 of the substrate 11 are two opposite sides of the substrate 11, and usually, the first surface 111 is an upper surface, and the second surface 112 is a lower surface of the substrate 11. Optionally, the substrate 11 is a microwave teflon dielectric plate, and the thickness of the substrate 11 may be about 1 mm.

The antenna feed layer comprises a first ground point 101 in communication with the high frequency element 12, a first microstrip antenna 102 coupled to feed the high frequency element 12, a second ground point 103 in communication with the low frequency element 13, and a second microstrip antenna 104 coupled to feed the low frequency element 13. The first grounding point 101 is disposed adjacent to the first microstrip antenna 102 and corresponds to the high frequency unit 12, and the second grounding point 103 is disposed adjacent to the second microstrip antenna 104 and corresponds to the low frequency unit 13.

In this embodiment, the first microstrip antenna 102 and the second microstrip antenna 104 are both L-shaped branches. The invention adopts the L-shaped microstrip antenna to carry out coupling feed on the high-frequency unit 12 and the low-frequency unit 13 on the back, and the L-shaped branch form has obvious effect on the port standing wave matching of the antenna.

The first grounding point 101 and the second grounding point 103 are metalized through holes, and are electrically connected with the high frequency unit 12 and the low frequency unit 13 on the back surface through the metalized through holes. Further, the dual band directional antenna 100 further comprises a first coaxial line (not shown) connecting the first ground point 101 and the first microstrip antenna 102, and a second coaxial line (not shown) connecting the second ground point 103 and the second microstrip antenna 104. That is, the first grounding point 101 is electrically connected to the first microstrip antenna 102 via a first coaxial line, and the second grounding point 103 is electrically connected to the second microstrip antenna 104 via a second coaxial line.

The first coaxial line and the second coaxial line are disposed within the substrate 11. The first coaxial ground layer is connected with the first ground point 101, and the first coaxial feed layer is connected with the first microstrip antenna 102; the ground layer of the second coaxial line is connected to a second ground point 103 and the feed layer of the second coaxial line is connected to a second microstrip antenna 104.

The high frequency unit 12 of the present invention includes two first array antennas 121, and the low frequency unit 13 includes two second array antennas 131. The two first array antennas 121 are symmetrically arranged in parallel, and the two second array antennas 131 are symmetrically arranged in parallel. Of course, in the present invention, the number of the first array antennas 121 in the high frequency unit 12 and the number of the second antenna arrays in the low frequency unit 13 are not limited to two, and any number may be set according to configuration requirements, and the arrangement manner may also be diversified.

The first array antenna 121 includes a first connection line 1211, a high frequency radiation arm 1212 connected to both ends of the first connection line 1211, and a high frequency feeding ground point 1213. The high-frequency feeding ground point 1213 is disposed on any one of the first connecting lines 1211 and is electrically connected to the first ground point 101. In particular, the position of this high frequency feeding ground point 1213 is arranged corresponding to the position of the first ground point 101, i.e. symmetrically on both sides of the substrate 11.

In an exemplary embodiment, the high frequency unit 12 includes four high frequency radiating arms 1212, and each high frequency radiating arm 1212 is about 34.5mm long. Since the high frequency unit 12 has a high frequency and a short wavelength, the high frequency radiating arm 1212 does not need to be bent and miniaturized. The four high-frequency radiating arms 1212 form two antenna arrays, the two antenna arrays are connected in parallel by two parallel lines through a first connection line 1211, and the two first array antennas 121 are coupled and fed through the first microstrip antenna 102 of the first plane 111L.

The second array antenna 131 comprises a second connection 1311, a low frequency radiating arm 1312 connected across the second connection 1311, and a low frequency feed ground point 1313. The low frequency feeding ground point 1313 is disposed on any one of the second connection lines 1311 and is electrically connected to the second ground point 103. In particular, the position of this low frequency feeding ground point 1313 is arranged corresponding to the position of the second ground point 103, i.e. symmetrically on both sides of the substrate 11.

In an exemplary embodiment, the low frequency unit 13 includes four low frequency radiating arms 1312, and each low frequency radiating arm 1312 has a length of about 100 mm. In order to reduce the overall size of the low frequency unit 13, the low frequency radiating arm 1312 of the low frequency unit 13 is bent such that the length of the low frequency radiating arm 1312 is shortened by 50% or more. The four low-frequency radiating arms 1312 form two antenna arrays, the two antenna arrays are connected in parallel by two parallel lines through a second connection line 1311, and the two second array antennas 131 are coupled and fed through the second microstrip antenna 104 of the first plane 111L.

The metal reflector 20 of the present invention is used to improve the gain of the antenna, and the metal reflector 20 is mounted on the second surface 112 of the substrate 11. Further, in order to further improve the gain and front-to-back ratio of the antenna, the metal reflection plate 20 includes a hemming structure bent around and extending toward the second surface 112, that is, the surrounding of the metal reflection plate 20 is hemmed. The distance between the metal reflector 20 and the substrate 11 can be finely adjusted, so that the working efficiency of the antenna can be conveniently adjusted.

The dual-band directional antenna 100 further includes a connection mechanism, and the substrate 11 is connected to the metal reflector 20 through the connection mechanism. In an alternative embodiment, the connection mechanism includes a connection hole 141 disposed on the substrate 11 and a stud 142 disposed in the metal reflection plate 20, the substrate 11 can be fixed in the metal reflection plate 20 by a screw 143, and the distance between the substrate 11 and the metal reflection plate 20 can be adjusted by adjusting the screw 143. The plurality of connection mechanisms are uniformly distributed on the dual-band directional antenna 100. Of course, the connection manner of the connection mechanism of the present invention is not limited thereto, and the connection mechanism may connect the substrate 11 and the metal reflection plate 20 by means of a latch, a snap, or the like.

A detailed description is given below of a dual-band directional antenna in an embodiment of the present invention, specifically:

the antenna is modeled and simulated by professional simulation software, the simulation result of the antenna is shown in fig. 4 to 8, the standing wave bandwidth of low frequency S11 < -10dB is 27MHz, the maximum gain value is 8.5dBi, the standing wave bandwidth of high frequency S11 < -10dB is 60MHz, the maximum gain value is 10.17dBi, and the isolation between the antennas is less than-18 dB.

The invention designs a low-profile and high-gain dual-band directional antenna, which adopts an array antenna form of dual-port input and microstrip coupling feed, can realize remote transmission communication of signals in a dual-frequency range of 840MHz/1400MHz, has gain of 8.5-10.1 dBi in a frequency band range, and has a profile height of only 0.07 lambda_LComparison transmissionThe height of the system in the quarter-wavelength dimension is reduced by approximately 75%. And a Printed Circuit Board (PCB) loading scheme is adopted, so that the consistency of the product is ensured. The invention has the advantages of low profile, wide frequency band, high gain and directional radiation on the basis of the characteristic of double frequency, has simple structure and easy processing, can be well applied to the receiving and transmitting of signals in various frequency bands, and is suitable for more occasions.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.