阅读说明：本技术 宽带天线 (Broadband antenna ) 是由 刘若鹏 赵治亚 马留涛 于 2020-05-27 设计创作，主要内容包括：本发明公开了一种宽带天线,包括接地层；由接地层承载的馈电微带线；和馈电微带线设置在接地层同一侧且和馈电微带线通过绝缘介质层相隔的辐射贴片；以及,位于绝缘介质层内且相互平行的第一L型探针和第二L型探针,其中,第一L型探针由第一臂和第二臂组成,第二L型探针由第三臂和第四臂组成,第一臂和第三臂设置在辐射贴片的下方且平行于辐射贴片,第二臂和第四臂的开放端连接馈电微带线。本发明所提供的宽带天线在C波段同时具有体积小和宽频带、高增益的优点。(The invention discloses a broadband antenna, which comprises a grounding layer; a feed microstrip line carried by the ground plane; the radiation patch is arranged on the same side of the ground layer as the feed microstrip line and is separated from the feed microstrip line by an insulating medium layer; and the first L-shaped probe and the second L-shaped probe are positioned in the insulating medium layer and are parallel to each other, wherein the first L-shaped probe consists of a first arm and a second arm, the second L-shaped probe consists of a third arm and a fourth arm, the first arm and the third arm are arranged below the radiation patch and are parallel to the radiation patch, and the open ends of the second arm and the fourth arm are connected with the feed microstrip line. The broadband antenna provided by the invention has the advantages of small volume, wide frequency band and high gain at the C wave band.)

1. A wideband antenna, comprising:

a ground plane;

a feed microstrip carried by the ground plane;

the radiation patch is arranged on the same side of the ground layer as the feed microstrip line and is separated from the feed microstrip line by an insulating medium layer; and the number of the first and second groups,

the first L-shaped probe and the second L-shaped probe are positioned in the insulating medium layer and are parallel to each other, the first L-shaped probe consists of a first arm and a second arm, the second L-shaped probe consists of a third arm and a fourth arm, the first arm and the third arm are arranged below the radiation patch and are parallel to the radiation patch, and the open ends of the second arm and the fourth arm are connected with the feed microstrip line.

2. The wideband antenna of claim 1,

the feed microstrip line is of a T-shaped structure consisting of a top end transverse line and a support vertical line, and the top end transverse line is symmetrically distributed relative to the support vertical line;

the supporting vertical line is arranged on the central longitudinal axis of the ground layer;

the open end of the supporting vertical line is a feeding point.

3. The wideband antenna of claim 2,

the two L-shaped probes are respectively connected with two tail ends on a transverse line at the top end of the feed microstrip line, one arm of each of the two L-shaped probes is perpendicular to a plane where the radiation patch is located, and the other arm of each of the two L-shaped probes is parallel to the plane where the radiation patch is located;

the contact points of the two L-shaped probes and the feed microstrip line are arranged on the top transverse line and are symmetrically distributed about the central longitudinal axis of the ground layer.

4. The wideband antenna of claim 2,

the radiation patch is arranged on the upper surface of the insulating medium layer; and the number of the first and second groups,

the radiation patches are symmetrically distributed about a target axis, and the projection of the target axis on the plane of the ground layer is coincident with the central longitudinal axis of the ground layer.

5. The wideband antenna of claim 1, further comprising: a dielectric coating layer, wherein,

the medium coating layer is positioned on one side of the radiation patch away from the ground layer;

and the distance between the dielectric coating and the surface of the grounding layer far away from the radiation patch is 0.5 lambda, wherein lambda is the wavelength corresponding to the central working frequency of the broadband antenna.

6. A wideband antenna according to claim 5, characterised in that the planar dimensions of the dielectric cover and the ground plane are the same and the projection of the dielectric cover onto the plane of the ground plane coincides with the ground plane.

7. The wideband antenna of claim 6,

foam plastics are filled in the insulating medium layer to form a medium interlayer;

and the plane size of the medium interlayer is the same as that of the ground layer, and the projection of the medium interlayer on the plane of the ground layer is superposed with the ground layer.

8. The wideband antenna of claim 7, further comprising: and the support columns support the medium coating so as to fix the medium coating on the medium interlayer.

9. The wideband antenna of claim 1,

the radiation patch is of a rectangular structure, a first side and a third side in the radiation patch are parallel, and a second side and a fourth side in the radiation patch are parallel;

an arm of the L-shaped probe arranged right below the radiation patch is parallel to the first edge and the third edge of the radiation patch;

the first edge and the third edge of the radiation patch are of a zigzag structure.

10. The wideband antenna of claim 1, wherein the ground plane comprises a dielectric base layer and a metal plating layer, and the metal plating layer is disposed on a side of the dielectric base layer away from the dielectric layer.

Technical Field

The invention relates to the technical field of communication, in particular to a broadband antenna.

Background

The C-band is a band with the frequency from 4.0GHz to 8.0GHz, and is firstly adopted and widely used in satellite television broadcasting and various small satellite ground station applications, and the C-band antenna is an antenna for receiving C-band signals.

The existing C-band antenna is generally a parabolic antenna (commonly called a cauldron), and the C-band antenna occupies a large space and has installation and fixation difficulties, so that it is difficult for a general user to plan to receive multiple satellite television programs by installing multiple antennas. Based on this, some schemes try to select a commonly-used patch structure to manufacture a C-band antenna, that is, energy of a feed structure is coupled to a radiation patch on the other side of a medium layer in the patch antenna through a probe so as to radiate electromagnetic waves outwards through the radiation patch, but these schemes have undesirable impedance bandwidth and antenna gain, and are not suitable for a scenario where the antenna impedance bandwidth requirement is too wide and the antenna gain requirement is high.

Aiming at the technical problems of large volume, narrow bandwidth and low gain of the current C-band antenna, an effective solution is lacked in the prior art.

Disclosure of Invention

In order to solve the problems in the prior art, the present invention provides a broadband antenna, which has the characteristics of small volume, wide frequency band and high gain.

The present invention provides a broadband antenna, comprising:

a ground plane;

a feed microstrip carried by the ground plane;

the radiation patch is arranged on the same side of the ground layer as the feed microstrip line and is separated from the feed microstrip line by an insulating medium layer; and the number of the first and second groups,

the first L-shaped probe and the second L-shaped probe are positioned in the insulating medium layer and are parallel to each other, the first L-shaped probe consists of a first arm and a second arm, the second L-shaped probe consists of a third arm and a fourth arm, the first arm and the third arm are arranged below the radiation patch and are parallel to the radiation patch, and the open ends of the second arm and the fourth arm are connected with the feed microstrip line.

Optionally, the feed microstrip line is a T-shaped structure formed by a top end transverse line and a support vertical line, and the top end transverse line is symmetrically distributed with respect to the support vertical line;

the supporting vertical line is arranged on the central longitudinal axis of the ground layer;

the open end of the supporting vertical line is a feeding point.

Optionally, the two L-shaped probes are respectively connected to two ends of a top transverse line of the feed microstrip line, one arm of each of the two L-shaped probes is perpendicular to a plane where the radiation patch is located, and the other arm of each of the two L-shaped probes is parallel to the plane where the radiation patch is located;

the contact points of the two L-shaped probes and the feed microstrip line are arranged on the top transverse line and are symmetrically distributed about the central longitudinal axis of the ground layer.

Optionally, the radiation patch is disposed in the center of the upper surface of the insulating medium layer; and the number of the first and second groups,

the radiation patches are symmetrically distributed about a target axis, and the projection of the target axis on the plane of the ground layer is coincident with the central longitudinal axis of the ground layer.

Optionally, the wideband antenna further comprises: a dielectric coating layer, wherein,

the medium coating layer is positioned on one side of the radiation patch away from the ground layer;

and the distance between the dielectric coating and the surface of the grounding layer far away from the radiation patch is 0.5 lambda, wherein lambda is the wavelength corresponding to the central working frequency of the broadband antenna.

Optionally, the planar dimensions of the dielectric coating layer and the ground layer are the same, and the projection of the dielectric coating layer on the plane of the ground layer coincides with the ground layer.

Optionally, the insulating medium layer is filled with foamed plastic to form a medium interlayer;

and the plane size of the medium interlayer is the same as that of the ground layer, and the projection of the medium interlayer on the plane of the ground layer is superposed with the ground layer.

Optionally, the wideband antenna further comprises: and the support columns support the medium coating so as to fix the medium coating on the medium interlayer.

Optionally, the radiation patch is in a rectangular structure, and the first side and the third side of the radiation patch in the rectangular structure are parallel, and the second side and the fourth side are parallel;

an arm of the L-shaped probe arranged right below the radiation patch is parallel to the first edge and the third edge of the radiation patch;

the first edge and the third edge of the radiation patch are of a zigzag structure.

Optionally, the ground layer includes a dielectric base layer and a metal plating layer, and the metal plating layer is disposed on a side of the dielectric base layer away from the insulating dielectric layer.

The invention has the beneficial effects that:

the broadband antenna provided by the invention adopts the patch structure with the advantage of small volume, and the double L-shaped probes are arranged in the insulating medium layer between the feed microstrip line and the radiation patch, one arm of each L-shaped probe is arranged below the radiation patch and is parallel to the radiation patch, and the open end of the other arm is connected with the feed microstrip line, so that the electric energy transmitted by the feed microstrip line is better coupled to the radiation patch by the double L-shaped probe structure, thereby not only realizing the characteristic of a broadband antenna, but also reducing the cross polarization component of the E surface of the antenna, greatly improving the gain of the patch antenna, and realizing the technical effect that the broadband antenna is provided with small volume, broadband and high gain at the same time.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.

FIG. 1 illustrates a perspective view of a broadband antenna in an embodiment of the present invention;

FIG. 2 shows an exploded view of the broadband antenna shown in FIG. 1;

FIG. 3 illustrates a perspective view of an alternative broadband antenna in an embodiment of the present invention;

FIG. 4 illustrates a perspective view of an alternative broadband antenna in an embodiment of the present invention;

FIG. 5 is a schematic voltage standing wave ratio diagram of a broadband antenna provided by an embodiment of the invention;

FIG. 6 shows an E-plane pattern at 4.5G for a wideband antenna provided by an embodiment of the present invention;

FIG. 7 shows an E-plane pattern at 5.0G for a wideband antenna provided by an embodiment of the present invention;

FIG. 8 shows an E-plane pattern at 5.5G for a wideband antenna provided by an embodiment of the present invention;

FIG. 9 shows an H-plane pattern at 4.5G for a wideband antenna provided by an embodiment of the present invention;

FIG. 10 shows an H-plane pattern at 5.0G for a wideband antenna provided by an embodiment of the present invention;

fig. 11 shows an H-plane pattern at 5.5G for a wideband antenna provided by an embodiment of the present invention.

Detailed Description

The invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by like reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale. Moreover, certain well-known elements may not be shown in the figures.

In the following description, numerous specific details of the invention, such as structure, materials, dimensions, processing techniques and techniques of the devices are described in order to provide a more thorough understanding of the invention. However, as will be understood by those skilled in the art, the present invention may be practiced without these specific details.

Embodiments of the present invention are specifically described below with reference to the accompanying drawings.

Fig. 1 is a perspective view of a broadband antenna according to an embodiment of the present invention, and fig. 2 is an exploded view of the broadband antenna. Referring to fig. 1 and 2, the present invention provides a broadband antenna including:

a ground layer 1 as a ground plate of the broadband antenna;

a feed microstrip line 2 carried by the ground plane 1;

a radiation patch 3 which is arranged on the same side of the ground layer 1 as the feed microstrip line 2 and is separated from the feed microstrip line 2 by an insulating medium layer (not labeled in fig. 1 and 2);

a radiation patch 3 which is arranged on the side of the feed microstrip line 2 far away from the ground layer 1 (namely, on the side of the feed microstrip line 2 along the positive half axis of the z axis) and is separated from the feed microstrip line 2 by an insulating medium layer (which is not marked in fig. 1 and 2);

and a first L-shaped probe 4 and a second L-shaped probe 5 which are parallel to each other and located in the insulating dielectric layer, the first L-shaped probe 4 is composed of a first arm 41 and a second arm 42, the second L-shaped probe 5 is composed of a third arm 51 and a fourth arm 52, wherein the first arm 41 and the third arm 51 are arranged below the radiation patch 3 (i.e. on the negative half axis side of the radiation patch 3 along the z axis) and are parallel to the radiation patch 3, and the open ends of the second arm 42 and the fourth arm 52 are respectively connected with the feed microstrip line 2.

The open end of the second arm 42 means the end of the second arm 42 not connected to the first arm 41; the above-mentioned open end of the fourth arm 52 means an end of the fourth arm 52 which is not connected to the third arm 51.

According to the broadband antenna provided by the embodiment of the invention, the first L-shaped probe 4 and the second L-shaped probe 5 form a double-L-shaped probe structure, one arm of each L-shaped probe is arranged below the radiation patch 3 and is parallel to the radiation patch 3, and the open end of the other arm is connected with the feed microstrip line 2, so that electric energy transmitted by the feed microstrip line 2 is well coupled to the radiation patch 3 through the double-L-shaped probe structure, the broadband antenna realizes the characteristic of a broadband, the cross polarization component of the E surface of the antenna is reduced, the gain of the patch antenna is greatly improved, and the technical effects that the broadband antenna is small in volume, broadband and high in gain are realized.

Further, the feed microstrip line 2 has a T-shaped structure composed of a top end transverse line 21 and a support vertical line 22, and the top end transverse line 21 is connected with the branchThe supporting vertical lines 22 are symmetrically distributed; the supporting vertical line 22 is arranged on the central longitudinal axis O of the ground plane 1₁O₂The above step (1); the open ends of the supporting vertical lines 22 are feeding points, wherein the central longitudinal axis O of the ground plane 1₁O₂I.e. a symmetry axis of the ground plane 1 along the x-axis direction, so that the feeding microstrip line 2 and the ground plane 1 form an axisymmetric feeding structure.

Based on the above-mentioned axisymmetric structure of the feed microstrip line 2, the structure of the double L-shaped probe may be set as follows: the first L-shaped probe 4 and the second L-shaped probe 5 are respectively connected with two tail ends on a transverse line at the top end of the feed microstrip line 2, the second arm 42 and the fourth arm 52 are both vertical to a plane where the radiation patch 3 is located, and the first arm 41 and the third arm 51 are both parallel to the plane where the radiation patch 3 is located; a contact point Q1 of the first L-shaped probe 4 and the feed microstrip line 2 and a contact point Q2 of the second L-shaped probe 5 and the feed microstrip line 2 are arranged on the top end transverse line and are relative to the central longitudinal axis O of the ground layer 1₁O₂And the first L-shaped probe 4 and the second L-shaped probe 5 are symmetrically distributed, so that the first L-shaped probe and the second L-shaped probe form a symmetrical structure relative to the feed microstrip line 2, thereby being beneficial to fully coupling the electric energy transmitted by the feed microstrip line 2 to the radiation patch 3.

Also, based on the above-described axisymmetrical structure of the feed microstrip line 2, the radiation patch 3 may be provided as follows: the radiation patch 3 is arranged in the center of the upper surface of the insulating medium layer; and, the radiation patch 3 is about the target axis C₁C₂Symmetrically distributed, target axis C₁C₂Projection on the plane of the ground plane 1 and the central longitudinal axis O of the ground plane 1₁O₂Therefore, the radiation patch 3 has an axisymmetric structure relative to the feed microstrip line 2, so that the radiation patch 3 radiates out electromagnetic waves in a symmetric manner, and the maximum value of the antenna gain obtained in the direction of the symmetric axis is maximized.

Further, the radiation patch 3 has a rectangular structure, and the first side 31 and the third side 33 of the radiation patch 3 having the rectangular structure are parallel (i.e., both in the x-axis direction), and the second side and the fourth side are parallel (i.e., both in the y-axis direction); the first arm 41 and the third arm 51 of the double-L-shaped probe are along the x-axis direction, namely, are parallel to the first side 31 and the third side 33 of the radiation patch 3; the first edge 31 and the third edge 33 of the radiation patch 3 are of a zigzag structure, so that the first edge 31 and the third edge 33 of the radiation patch 3 are used as the radiation edges of the radiation patch 3 and adopt the zigzag structure, thereby not only prolonging the current path on the radiation patch 3 to increase the gain of the antenna, but also realizing the technical effect that the resonance point shifts to the low frequency without increasing the size of the antenna, and being beneficial to reducing the size of the antenna.

Further, the ground layer 1 includes a dielectric bottom layer and a metal plating layer, the metal plating layer is plated on a surface of the dielectric bottom layer far from the insulating dielectric layer, that is, one side of the ground layer 1 along the positive half axis of the z axis is the dielectric bottom layer and one side along the negative half axis of the z axis is the metal plating layer, the arrangement of the dielectric bottom layer enables the electric energy transmitted by the feed microstrip line 2 not to flow to the ground in a large amount, which is beneficial to coupling the radiation patch 3 to more electric energy, thereby enhancing the gain of the broadband antenna.

The radiation patch 3 may be supported on the ground plane 1 through a support structure to form an insulating medium layer between the radiation patch and the feed microstrip line 2 carried on the ground plane 1, and the insulating medium layer is filled with air during the use of the antenna, that is, the insulating medium layer is formed through an air layer. In an alternative embodiment of the present invention, referring to fig. 3, the insulating medium layer between the feed microstrip line 2 and the radiation patch 3 is filled with foamed plastic to form a medium interlayer 6; and the plane size of the medium interlayer 6 is the same as that of the ground layer 1, and the projection of the medium interlayer 6 on the plane of the ground layer 1 is superposed with the ground layer 1.

It should be noted that, unless otherwise specified, the plane size in each embodiment of the present invention refers to a size projected onto the xy plane.

Specifically, the foam plastic may be PMI foam, that is, a material prepared by disposing voids in polymethacrylimide, which is the hardest structural core material under the current condition of the same density, and belongs to a light-weight high-strength material.

In the embodiment of the present invention, a dielectric interlayer 6 is formed by filling foam plastic in an insulating dielectric layer between the feed microstrip line 2 and the radiation patch 3, so that the radiation patch 3 is supported on the ground layer 1 through the dielectric interlayer 6, and the first L-shaped probe 4 and the second L-shaped probe 5 are fixed through the dielectric interlayer 6 filled around.

Referring to fig. 4, in another alternative embodiment, the wideband antenna further includes: a dielectric coating 7, wherein the dielectric coating 7 is located on a side of the radiation patch 3 away from the ground layer 1 (i.e. on a side of the radiation patch 3 along a positive half axis of the z-axis, i.e. on a side of the radiation patch 3 where the ground layer 1 is not located); and the distance between the dielectric coating layer 7 and the surface of the grounding layer 1 far away from the radiation patch 3 is 0.5 lambda, wherein lambda is the wavelength corresponding to the central working frequency of the broadband antenna, so that according to the Fabry-Perot cavity (F-B cavity for short) theory, the electromagnetic waves radiated out by the radiation patch 3 along the z axis realize field intensity superposition, namely the width of the main lobe of the antenna is narrowed, the maximum gain of the antenna along the z axis direction is further improved, and the gain of the whole frequency band of the C wave band can be improved by about 1.2dB through tests.

Specifically, the dielectric coating 7 may have the same planar dimensions as the ground plane 1, and the projection of the dielectric coating 7 onto the plane of the ground plane 1 coincides with the ground plane.

Further, the broadband antenna further comprises: the support posts of the dielectric coating 7 are supported to secure the dielectric coating 7 to the dielectric spacer 6. Specifically, the broadband antenna may include four support columns with equal height, and the ground plane 1 and the dielectric coating 7 are both rectangular structures, and the four support columns are respectively disposed in four corner regions of the dielectric coating 7, fig. 4 only indicates a first support column 81, a second support column 82, and a third support column 83 of the four support columns for reasons of viewing angle, and the support columns, which are not indicated, of the four support columns and the first support column 81 are arranged along the x axis and the third support column is arranged along the y axis.

If a half of the wavelength corresponding to the central operating frequency of the broadband antenna is 40mm, the broadband antenna may specifically adopt the following dimensions: (1) the grounding layer 1, the medium interlayer 6 and the medium cladding layer 7 are of a cubic structure, and the cross sections parallel to the xy plane are all squares with the side length of 60 mm; (2) the thickness of the dielectric bottom layer along the z axis is 1mm, and the dielectric constant is 2.2; (3) the metal coating in the grounding layer 1 is made of copper; (4) the thickness of the medium interlayer 6 along the z axis is 6 mm; (5) the dielectric constant of the material adopted by the dielectric coating 7 is 9.8; (6) the lengths of the first side 31 and the third side 32 in the radiation patch 3 are 22mm, and the lengths of the other two sides are 29 mm; (7) the height of the L-shaped probe in the z-axis is 4mm and the length along the x-axis is 12 mm; (8) the thickness of the metallization, the radiating patch 3 and the dielectric coating 7, respectively, along the z-axis is negligible with respect to the antenna dimensions.

The inventor selects the broadband antenna with the size provided by the embodiment of the invention to perform performance test, and the test result shows that: the input impedance of the antenna is 50 omega, so that the common optimal input impedance is achieved; and the test results of the voltage standing wave ratio and the gain are shown in fig. 5 to 11, wherein fig. 5 is a voltage standing wave ratio curve of the antenna; fig. 6 to 8 show E-plane directional patterns of the antenna at three different frequency points of 4.5GHz, 5GHz and 5.5GHz in sequence, where the E-plane of the antenna is the xz-plane shown in fig. 4; fig. 9 to fig. 11 show H-plane patterns of the antenna at three different frequency points of 4.5GHz, 5GHz and 5.5GHz in sequence, where the H-plane of the antenna is the yz-plane shown in fig. 4. Also, in fig. 6 to 11, the closed curve indicated by the dotted line represents the main polarization curve, and the closed curve indicated by the solid line represents the cross polarization curve; two value taking points with names m1 and m2 named in the main radiation direction are a main polarization value taking point and a cross polarization value taking point in turn, wherein the main radiation direction refers to a direction (namely the direction along the z axis) with an included angle Theta of 0 degrees between the plane E or the plane H of the antenna and the z axis; and, the gain Mag values for point m1 and point m2 and the 3dB lobe width xdb10Beamwidth (3) values indicated in the figures are as follows:

in FIG. 6, the gain at point m1 is 10.0017dB, the gain at point m2 is-45.5545 dB, the 3dB lobe width of the main polarization curve is 42.9672 degrees, and the 3dB lobe width of the cross polarization curve is 56.7319 degrees;

in FIG. 7, the gain at point m1 is 10.7688dB, the gain at point m2 is-35.1188 dB, the 3dB lobe width of the main polarization curve is 23.5762 degrees, and the 3dB lobe width of the cross polarization curve is 45.0116 degrees;

in FIG. 8, the gain at point m1 is 10.2943dB, the gain at point m2 is-28.5052 dB, the 3dB lobe width of the main polarization curve is 32.9856 degrees, and the 3dB lobe width of the cross polarization curve is 38.6560 degrees;

in FIG. 9, the gain at point m1 is 10.0017dB, the gain at point m2 is 0dB, the 3dB lobe width of the main polarization curve is 61.0915 degrees, and the 3dB lobe width of the cross polarization curve is 49.5566 degrees;

in FIG. 10, the gain at point m1 is 10.7688dB, the gain at point m2 is-35.1188 dB, the 3dB lobe width of the main polarization curve is 59.9422 degrees, and the 3dB lobe width of the cross polarization curve is 48.9367 degrees;

in FIG. 11, the gain at point m1 is 10.2943dB, the gain at point m2 is-28.5052 dB, the 3dB lobe width of the main polarization curve is 66.1234 degrees, and the 3dB lobe width of the cross polarization curve is 50.4569 degrees.

As can be seen from the voltage standing wave ratio curve shown in fig. 5: in the frequency band range of 4.1 GHz-5.63 GHz, the voltage standing wave ratio of each frequency point of the antenna is less than 2.0, so that 4.1 GHz-5.63 GHz can be used as the working frequency band range of the antenna, and the relative bandwidth of the antenna in the frequency band range reaches 30%.

As can be seen from the antenna E-plane pattern curves shown in fig. 6 to 8: (1) the cross polarization value of the E surface of the antenna is extremely small, and the maximum isolation in the whole working frequency band reaches-55.5562 dB shown in figure 6; (2) the 3dB lobe width of the E surface of the antenna is narrow, energy is concentrated in the main radiation direction and radiates outwards, and the minimum lobe width of the main polarization curve in the whole working frequency band reaches 23.5762 degrees shown in figure 7.

As can be seen from the antenna H-plane pattern curves shown in fig. 9 to 11: (1) the cross polarization of the H surface of the antenna is increased relative to the E surface and gradually increases in the main radiation direction; (2) the narrowing effect of the lobe width of the main polarization curve in the whole frequency band is not obvious, which is similar to that of the conventional patch and is mainly determined by the feeding mode.

Also, as can be seen from the pattern curves shown in fig. 6 to 11: the actual radiation gain value of the main polarization of the selected antenna at three frequency points of 4.5GHz, 5GHz and 5.5GHz is 10.0017dB shown in figures 6 and 9, 10.7688dB shown in figures 7 and 10 and 10.2943dB shown in figures 8 and 11 in sequence, namely, the actual radiation gain of the main polarization of the antenna in the whole working frequency band is greater than 10dB and is higher than the radiation gain of 2 dB-3 dB of a common antenna.

Therefore, the broadband antenna provided by the embodiment of the invention has the characteristics of broadband and high gain under the condition that the size is only 60mm multiplied by 40mm, the installation space is saved, and the broadband antenna can be conformal with a carrier platform when being used for ground communication and aircraft communication.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Further, in the above description, the directional terms such as center, front, back, rear, left, right, top, bottom, upper, lower, lateral, longitudinal, etc. and the dimensioning terms such as thickness, height, length, etc. are defined with respect to the configurations shown in the respective drawings, which are relative concepts, and thus there is a possibility that corresponding changes may be made depending on the location and use state thereof, and thus, these terms should not be construed as limiting terms. And terms concerning attachment refer to a relationship wherein structures are secured or attached to one another either directly or indirectly through intervening structures, as well as both movable or rigid attachments or relationships, unless expressly described otherwise.

While embodiments in accordance with the invention have been described above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.