CN111769358A - Low-profile broadband directional diagram diversity antenna based on super-surface - Google Patents
Low-profile broadband directional diagram diversity antenna based on super-surface Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides a low-profile broadband directional diagram diversity antenna based on a super surface, which comprises a first dielectric plate, a second dielectric plate and a third dielectric plate which are stacked, wherein: the first dielectric plate is provided with a super-surface radiation unit consisting of 4x4 square metal patches which are periodically arranged on the upper surface; 4 rectangular feed patches are printed on the upper surface of the second dielectric plate to feed the super-surface radiation unit; a metal floor is printed on the lower surface of the second dielectric plate; and a feed network is printed on the lower surface of the third rectangular dielectric plate, and an output port of the third rectangular dielectric plate is connected with the rectangular feed patch through a metalized through hole. The invention realizes directional diagram diversity by coupling feeding to excite different modes of the corner-cut processed super-surface, simultaneously reduces the height of the antenna section and widens the bandwidth of the antenna, has the advantage that the directional diagram does not generate side lobes in the working bandwidth when working in the edge-emitting mode, and can be applied to wireless communication systems such as a radio frequency front end and the like.
Description
Technical Field
The invention belongs to the technical field of antennas, relates to a directional diagram diversity antenna, and particularly relates to a low-profile broadband directional diagram diversity antenna based on a super-surface.
Background
With the rapid development of wireless communication and public expectation of high speed and high quality of wireless communication, the reliability and smoothness of communication become important evaluation indexes which are not negligible. The diversity antenna technology can make up for the deep fading of each signal by utilizing the characteristics that each channel is irrelevant, can effectively overcome the multipath fading effect, improve the communication reliability and stability, and is widely applied. The antenna diversity technology can be divided into polarization diversity and directional diagram diversity, wherein the polarization diversity is characterized in that electromagnetic waves with different polarizations at the same position are independent and do not influence each other, signals with different polarizations are received and synthesized at a receiving end to make up the influence of multipath fading, and therefore stable receiving of the signals is realized; the directional diagram diversity antenna can use the same radiation unit to generate different directional diagrams, has a plurality of advantages compared with the traditional antenna, for example, the number and the weight of the antennas loaded on a platform can be reduced, the total cost of the system is reduced, the capacity of a wireless communication system is improved, the functions of the system are expanded, and the like, and has wide application prospects in the fields of automobile radars, airplane radars, wireless and satellite communication networks, and the like.
There are two common implementations of existing pattern diversity antennas. Firstly, the method is realized by exciting different radiation structures, which causes the complexity of the structure of the whole system, the increase of the size and the narrower working bandwidth of the antenna; on the premise of expanding the bandwidth of the antenna, how to improve the radiation efficiency, enhance the port isolation and reduce the overall size of the antenna system becomes a hot problem of the current research. And secondly, exciting different modes of a microstrip patch antenna. Microstrip patch antennas are the primary antenna form for producing zenith-oriented radiation patterns and horizontal omni-directional patterns due to their low cost, low profile, ease of fabrication, and the like. When the patch is fed from the central position, the antenna generates an upward-inclined horizontal omnidirectional directional pattern; when the patch is fed from an off-center position, the antenna produces a pattern that radiates toward the zenith. Therefore, only one radiation patch and two sets of independent feed networks are needed, and the design can realize directional diagram diversity. However, there are some problems to be improved with this design. The first is that broadband and low profile cannot be achieved simultaneously. The low-profile microstrip patch antenna has a high Q value, resulting in a narrow bandwidth, which cannot meet the requirements of a broadband system. To increase bandwidth, current methods only achieve wideband pattern diversity by increasing the antenna profile. Secondly, the antenna is not compact enough. In order to realize the matching of the directional diagram diversity antenna in a broadband, an air layer is often introduced for matching, so that the antenna profile is high. Thirdly, as the frequency increases, the higher-order mode of the antenna is excited, thereby causing the problems of the deterioration of the directivity pattern and the increase of the side lobe when the antenna operates in the side-emitting mode.
The invention discloses a broadband directional pattern diversity antenna, which is a patent application with the application publication number of CN 109786963A and the name of 'a low-profile broadband directional pattern diversity antenna', and the invention adopts a three-dimensional monopole antenna and a rectangular microstrip patch antenna, thereby reducing the height and the size of the directional pattern diversity antenna and leading the antenna structure to be more compact; the three-dimensional monopole antenna adopts a double-bending hexagonal loop structure, so that the working bandwidth of a horizontal omnidirectional radiation mode is effectively expanded; when the length of a single bent hexagonal loop is close to half wavelength, the loop resonates; when the two bent hexagonal loops feed in phase, the coupling effect between the two bent hexagonal loops effectively expands the working bandwidth of the antenna; in addition, the L-shaped flat transmission line is adopted to replace a coaxial probe for differential feeding, so that the working bandwidth of the antenna in a lateral radiation mode is effectively increased. However, when the antenna operates in the edge-fire mode, the directional pattern is gradually deteriorated due to the gradual increase of the directional pattern side lobe along with the increase of the frequency in the operating frequency band. And the antenna has a high profile, up to 0.14 wavelength.
Therefore, it is important to design a pattern diversity antenna having a wide frequency band, a low profile, and a good pattern when operating in an edge-fire mode.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a low-profile broadband directional diagram diversity antenna based on a super-surface, aiming at solving the technical problems that the wide impedance bandwidth and the low-profile characteristic are difficult to obtain simultaneously and the directional diagram is gradually deteriorated as the side lobe of the directional diagram is gradually increased along with the increase of the frequency when the antenna works in the side-emitting mode in the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a low section broadband directional diagram diversity antenna based on super surface, includes first dielectric plate 1, second dielectric plate 2 and the third dielectric plate 3 that top-down stacks gradually, wherein: the center position of the upper surface of the first dielectric slab 1 is printed with a super-surface radiation unit 4 consisting of 4x4 periodically arranged square metal patches 41, the 4x4 square metal patches 41 are distributed in four quadrants of a plane rectangular coordinate system on the upper surface of the first dielectric slab 1, the number of the square metal patches 41 distributed in each quadrant is 2x2, and two square metal patches 41 adjacent to each other in the super-surface radiation unit 4 and far from a point are provided with a cutting angle to form a V-shaped notch with an outward opening;
4 rectangular feeding patches 5 which are rotationally symmetrical about the normal of the center of the second dielectric plate 2 are printed on the upper surface of the second dielectric plate 2, the included angle between every two adjacent rectangular feeding patches 5 is 90 degrees, and the connecting line of the midpoints of two short sides of each rectangular feeding patch 5 is superposed with the angle bisector of two coordinate axes of a plane rectangular coordinate system on the upper surface of the second dielectric plate 2 and used for realizing coupling feeding of the super-surface radiation unit 4; the lower surface of the second dielectric plate 2 is printed with a metal floor 6;
a feed network 7 is printed on the lower surface of the third rectangular dielectric plate 3, and the feed network 7 comprises two input ports and four output ports;
the rectangular feed patch 5 is connected with an output port of the feed network 7 through a metallized via hole 8 penetrating through the second dielectric plate 2 and the third dielectric plate 3, and directional pattern diversity characteristics of the antenna are realized by inputting signals to different input ports of the feed network 7.
In the low-profile broadband directional diagram diversity antenna based on the super surface, the two square metal patches 41 which are adjacent to each other in the super surface radiation unit 4 and are far away from the point O are provided with the cut angles, and the side lengths of the cut angles are equal to the side lengths of the square metal patches 41.
In the low-profile broadband directional diagram diversity antenna based on the super-surface, the origin of the plane rectangular coordinate system is located on the central normal of the first dielectric slab 1.
In the low-profile broadband directional diagram diversity antenna based on the super-surface, the plane rectangular coordinate system X ' O ' Y ' coincides with the normal projection of the plane rectangular coordinate system XOY on the second dielectric plate 2.
In the low-profile broadband directional pattern diversity antenna based on the super surface, the metal floor 6 is etched with a circular hole with a diameter larger than that of the metalized via hole 8 at the position where the metalized via hole 8 passes through.
In the super-surface-based low-profile broadband directional pattern diversity antenna, the feed network 7 includes a coupler 71 and a wilkinson power divider 72 connected to two output ports of the coupler 71, two input ports of the coupler 71 are used as input ports of the feed network 7, and an output port of the wilkinson power divider 72 is used as an output port of the feed network 7.
Compared with the prior art, the invention has the following advantages:
1. the invention adopts the super surface positioned on the upper surface of the first dielectric plate as the radiation unit, the resonance frequency points of the cone mode and the edge-emitting mode of the super surface can be close to each other under the condition of low profile, and in addition, the super surface has the advantages of low profile and broadband due to low Q value, thereby solving the problem that the low profile and the broadband can not be realized simultaneously due to high Q value of the prior directional diagram polarization antenna adopting a metal patch as a radiator, and realizing the effect of reducing the profile height of the antenna while widening the standing-wave ratio bandwidth of the antenna.
2. According to the invention, four rectangular metal patches positioned on the upper surface of the second dielectric plate are used for carrying out coupling feed on the super-surface radiation unit positioned on the upper surface of the first dielectric plate, and the capacitance between the rectangular metal patches and the super-surface radiation unit can offset the inductance component introduced by the metallized through hole, so that the effect of further widening the standing-wave ratio bandwidth is realized.
3. According to the directional diagram diversity antenna, the cut angles are arranged on the two square metal patches adjacent to the quadrants and far away from the point in the super-surface radiation unit to form the V-shaped notch with the outward opening, when the antenna works in the edge-fire mode, the reverse current on the surface of the radiation unit along with the increase of the frequency is weakened, the problem that the directional diagram is deteriorated due to the fact that the secondary lobe is gradually increased because the reverse current appears on the surface of the radiation unit along with the increase of the frequency when the conventional directional diagram diversity antenna uses the metal patches as the radiation unit and works in the edge-fire mode is solved, and the effect that the directional diagram always keeps a good state without the secondary lobe when the antenna works in the edge-fire mode is achieved.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a schematic diagram of a super-surface radiating element according to the present invention;
FIG. 3 is a schematic diagram of a rectangular feed patch of the present invention;
FIG. 4 is a schematic diagram of the feed network structure of the present invention;
FIG. 5 is an exploded view of the feed network of the present invention;
FIG. 6 is a graph of reflection coefficient versus frequency simulation results for an embodiment of the present invention;
FIG. 7(a) is a radiation pattern of the YOZ plane at 5.0GHz according to an embodiment of the present invention;
FIG. 7(b) is the radiation pattern of the XOZ plane at 5.0GHz according to an embodiment of the present invention;
FIG. 8(a) is the radiation pattern of the YOZ plane at 5.5GHz according to an embodiment of the present invention;
FIG. 8(b) is the radiation pattern of the XOZ plane at 5.5GHz according to an embodiment of the present invention;
FIG. 9(a) is a radiation pattern of the YOZ plane at 6.0GHz according to an embodiment of the present invention;
FIG. 9(b) is the radiation pattern of the XOZ plane at 6.0GHz according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
referring to fig. 1, the present invention includes a first rectangular dielectric sheet 1, a second rectangular dielectric sheet 2, and a third rectangular dielectric sheet 3 stacked one on top of the other.
The first rectangular dielectric slab 1, the second rectangular dielectric slab 2 and the third rectangular dielectric slab 3 are all square, the side length L is 70mm, the thickness of the first dielectric slab 1 is H1-0.5 mm, the thickness of the second dielectric slab 2 is H2-2 mm, and the thickness of the third dielectric slab 3 is H3-1 mm, wherein the first rectangular dielectric slab 1 is made of F4B material, the relative dielectric constant is 3.5, the loss tangent value is 0.001, the second rectangular dielectric slab 2 and the third rectangular dielectric slab 3 are made of FR4 material, the relative dielectric constant is 4.4, and the loss tangent value is 0.02;
the first dielectric plate 1 is structurally shown in fig. 2, a super-surface radiation unit 4 composed of 4x4 periodically arranged square metal patches 41 is printed at the central position of the upper surface of the first dielectric plate 1, the distance between the 4x4 square metal patches 41 is g equal to 1.95mm, the super-surface radiation unit is distributed in four quadrants of a planar rectangular coordinate system XOY located on the upper surface of the first dielectric plate 1, the origin of the rectangular coordinate system XOY is located at the central normal of the first dielectric plate 1, the side length Lp is equal to 9mm, the number of the square metal patches 41 distributed in each quadrant is 2x2, and the two square metal patches 41 adjacent to each quadrant in the super-surface radiation unit 4 and far from the O point are provided with cut angles to form a V-shaped notch with an outward opening, and the side length of each cut angle is the same as that of the square metal patches 41; when the antenna works in a side-emitting mode, the V-shaped notch weakens reverse currents which appear over the surface of the surface radiation unit 4 along with the increase of the frequency, and the increase of the reverse currents can cause the side lobe of a directional pattern to be gradually increased so that the directional pattern is deteriorated. Through optimization, when the side length of the cut angle is the same as that of the square metal patch 41, the reverse current appearing on the surface of the super-surface radiation unit 4 along with the increase of the frequency is minimum, and the influence on the directional diagram of the antenna when the antenna works in the cone mode is minimum.
The upper surface of the second dielectric plate 2 is printed with 4 rectangular feed patches 5 which are rotationally symmetric about the normal of the center of the second dielectric plate 2, the structure of the rectangular feed patches is shown in fig. 3, the length of each rectangular feed patch 5 is Lf-7.5 mm, the width of each rectangular feed patch 5 is Wf-2 mm, an included angle between adjacent rectangular feed patches 5 is 90 °, a connecting line of midpoints of two short sides of each rectangular feed patch 5 coincides with an angular bisector of two coordinate axes of a rectangular planar coordinate system X ' O ' Y ' located on the upper surface of the second dielectric plate 2, wherein the rectangular planar coordinate system coincides with a normal projection of the rectangular planar coordinate system XOY on the second dielectric plate 2. And a circular pad with the diameter of 2.4mm is connected to the center of the short side of the rectangular feed patch 5 far away from O' and is used for connecting the metalized via hole 8, and the distance between the centers of adjacent circular pads is 19.8mm.
For realizing coupled feeding to the super-surface radiation unit 4; the lower surface of the second dielectric plate 2 is printed with a metal floor 6 with a side length L of 70mm, the structure of which is shown in fig. 4, and a circular hole with a diameter of 3mm is etched at a position where the metalized via hole 8 passes through, so as to avoid the coupling effect between the metalized via hole 8 and the metal floor 6.
A feed network 7 is printed on the lower surface of the third rectangular dielectric plate 3, and as shown in fig. 4, the feed network 7 includes two input ports and four output ports; the feeding network 7 includes a coupler 71 and a wilkinson power divider 72 connected to two output ports of the coupler 71, as shown in fig. 5, two input ports of the coupler 71 serve as input ports of the feeding network 7, and an output port of the wilkinson power divider 72 serves as an output port of the feeding network 7.
The rectangular feed patches 5 are connected with the output ports of the feed network 7 through metallized via holes 8 with the diameters of 2mm penetrating through the second dielectric plate 2 and the third dielectric plate 3, bonding pads with the diameters of 2.2mm are arranged at the positions where the rectangular feed patches 5 and the feed network 7 are connected with the metallized via holes 8, and two pairs of equal-amplitude reverse-phase signals or two pairs of equal-amplitude in-phase signals are generated on the 4 rectangular feed patches 5 by inputting signals to different input ports of the feed network 7. Two pairs of equal-amplitude reverse signals on the rectangular feed patch 5 can excite an edge-emitting mode of the super-surface, and two pairs of equal-amplitude same-direction signals on the rectangular feed patch 5 can excite a conical mode of the super-surface, so that the directional diagram diversity characteristic of the antenna is realized. In addition, the capacitance between the rectangular feed patch 5 and the super-surface radiating unit 4 can offset the inductance component introduced by the metalized via hole, and the effect of further widening the standing-wave ratio bandwidth can be realized.
The working principle of the invention is that the feed network 7 printed on the lower surface of the third rectangular dielectric plate 3 can output two pairs of equal-amplitude same-direction or two pairs of equal-amplitude reverse signals in a wide frequency band, which is a prerequisite condition for realizing directional diagram diversity in the wide frequency band. When the port II is connected with a matched load, a signal input by the port I is divided into equal-amplitude reverse signals at the port a and the port b, then the equal-amplitude reverse signals are equally divided into equal-amplitude same-direction signals by a Wilkinson power divider respectively and are sent to four output ports of the feed network 7, namely two pairs of equal-amplitude reverse signals are generated on the rectangular feed patch 5, and the signals can excite the super surface to generate an edge-emitting directional diagram; when the port is connected with a matched load, the input signal of the port is divided into signals with equal amplitude and same direction at the port a and the port b, and then the signals are equally divided into the signals with equal amplitude and same direction by the Wilkinson power divider respectively and are sent to four output ports of the feed network 7 from (c) to (c), namely two pairs of signals with equal amplitude and same direction are generated on the rectangular feed patch 5, and the signals can excite the super surface to generate a conical directional diagram. Because all eigenmodes of the super-surface antenna have potential wide standing-wave ratio bandwidth, and resonance frequency points of all modes of each super-surface can be close to each other under the condition of low profile, and the resonance points of all eigenmodes of the common patch can be close to each other only by increasing the profile height as the common patch antenna, the invention realizes the effect of reducing the profile height of the antenna while widening the standing-wave ratio bandwidth of the antenna. The resulting antenna had a cross-sectional height reduced to 0.06 vacuum wavelengths and still had a common impedance bandwidth of 21.70%.
The technical effects of the invention are further explained by simulation experiments as follows:
1. simulation conditions and contents:
simulation a model simulation of the reflection coefficient and far field pattern of an embodiment of the invention was performed using commercial simulation software HFSS — 15.0.
The embodiment of the invention simulates the reflection coefficient of the antenna when the antenna is respectively in the cone mode and the edge-fire mode, and the result is shown in fig. 6;
in the embodiment of the present invention, when the antenna is in the cone mode and the edge-fire mode, directional patterns of the YOZ plane and the XOZ plane of the antenna at frequencies of 5.0GHz, 5.5GHz, and 6.0GHz are simulated, and the results are shown in fig. 7, 8, and 9.
2. And (3) simulation result analysis:
referring to FIG. 6, in S11And less than or equal to-10 dB, the relative bandwidth of the impedance of the antenna in the embodiment of the invention is 24.89% when the antenna works in a side-fire mode, 21.70% when the antenna works in a taper mode, and 21.70% of the common relative bandwidth of the impedance of the antenna in the two modes.
Referring to fig. 7 to 9, fig. 7(a) is a YOZ normalized directional diagram of the embodiment operating at 5.0GHz when the embodiment operates in the cone mode and the edge-fire mode, respectively, and fig. 7(b) is an XOZ normalized directional diagram of the embodiment operating at 5.0GHz when the embodiment operates in the cone mode and the edge-fire mode, respectively; FIG. 8(a) is a normalized YOZ plane directional diagram of the embodiment operating at 5.5GHz when the embodiment is respectively operated in the cone mode and the edge-fire mode, and FIG. 8(b) is a normalized XOZ plane directional diagram of the embodiment operating at 5.5GHz when the embodiment is respectively operated in the cone mode and the edge-fire mode; fig. 9(a) is a YOZ plane normalized pattern of the embodiment operating at 6.0GHz when operating in the cone mode and the edge-fire mode, respectively, and fig. 9(b) is an XOZ plane normalized pattern of the embodiment operating at 6.0GHz when operating in the cone mode and the edge-fire mode, respectively. When the implementation case works in a cone mode, the directional diagrams of all frequency bands are shown as good cone modes, and the normalized direction coefficients in the visual axis direction are all smaller than-30 dB; when the implementation case works in the edge-fire mode, the directional diagrams of all frequency bands are shown as good edge-fire modes, and no side lobe is generated in the directional diagrams.
Claims (6)
1. The utility model provides a low section broadband directional diagram diversity antenna based on super surface, its characterized in that includes first dielectric plate (1), second dielectric plate (2) and third dielectric plate (3) that top-down stacks gradually, wherein:
the center position of the upper surface of the first dielectric slab (1) is printed with a super-surface radiation unit (4) consisting of 4x4 square metal patches (41) which are periodically arranged, the 4x4 square metal patches (41) are distributed in four quadrants of a plane rectangular coordinate system XOY on the upper surface of the first dielectric slab (1), the number of the square metal patches (41) distributed in each quadrant is 2x2, and two square metal patches (41) which are adjacent to each quadrant and far away from an O point in the super-surface radiation unit (4) are provided with a cutting angle to form a V-shaped notch with an outward opening;
4 rectangular feed patches (5) which are rotationally symmetrical about the center normal of the second dielectric plate (2) are printed on the upper surface of the second dielectric plate (2), the included angle between every two adjacent rectangular feed patches (5) is 90 degrees, and the connecting line of the midpoints of two short sides of each rectangular feed patch (5) is superposed with the angular bisector of two coordinate axes of a plane rectangular coordinate system X ' O ' Y ' on the upper surface of the second dielectric plate (2) and is used for realizing the coupling feed of the super-surface radiation unit (4); a metal floor (6) is printed on the lower surface of the second dielectric plate (2);
a feed network (7) is printed on the lower surface of the third rectangular dielectric plate (3), and the feed network (7) comprises two input ports and four output ports;
the rectangular feed patch (5) is connected with an output port of the feed network (7) through a metallized through hole (8) penetrating through the second dielectric plate (2) and the third dielectric plate (3), and the directional diagram diversity characteristic of the antenna is realized by inputting signals to different input ports of the feed network (7).
2. The super-surface based low-profile broadband pattern diversity antenna of claim 1, wherein: and the two square metal patches (41) which are adjacent to each other in the super-surface radiation unit (4) and far away from the O point are provided with cut angles, and the side length of each cut angle is equal to that of the square metal patch (41) where the cut angle is located.
3. The super-surface based low-profile broadband pattern diversity antenna of claim 1, wherein: the origin of the rectangular plane coordinate system XOY is positioned on the central normal of the first medium plate (1).
4. The super-surface based low-profile broadband pattern diversity antenna of claim 1, wherein: and the plane rectangular coordinate system X ' O ' Y ' is superposed with the normal projection of the plane rectangular coordinate system XOY on the second dielectric slab (2).
5. The super-surface based low-profile broadband pattern diversity antenna of claim 1, wherein: the metal floor (6) is etched with a circular hole (61) larger than the diameter of the metalized via hole (8) at the position where the metalized via hole (8) passes through.
6. The super-surface based low-profile broadband pattern diversity antenna of claim 1, wherein: the feed network (7) comprises a coupler (71) and a Wilkinson power divider (72) connected with two output ports of the coupler (71), two input ports of the coupler (71) are used as input ports of the feed network (7), and an output port of the Wilkinson power divider (72) is used as an output port of the feed network (7).
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| CN115036687A (en) * | 2022-06-22 | 2022-09-09 | 航天特种材料及工艺技术研究所 | High radiation characteristic antenna based on butterfly-shaped super surface |
| CN115084856A (en) * | 2022-07-21 | 2022-09-20 | 广东工业大学 | Low-profile high-isolation super-surface microstrip patch antenna and wireless communication equipment |
| CN115275555A (en) * | 2022-08-05 | 2022-11-01 | 中国船舶集团有限公司第七二三研究所 | Ultra-wideband directional coupler integrated in antenna |
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| CN115275555A (en) * | 2022-08-05 | 2022-11-01 | 中国船舶集团有限公司第七二三研究所 | Ultra-wideband directional coupler integrated in antenna |
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