CN113964494B - Broadband circularly polarized antenna with filtering characteristic - Google Patents
Broadband circularly polarized antenna with filtering characteristic Download PDFInfo
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- CN113964494B CN113964494B CN202111199669.4A CN202111199669A CN113964494B CN 113964494 B CN113964494 B CN 113964494B CN 202111199669 A CN202111199669 A CN 202111199669A CN 113964494 B CN113964494 B CN 113964494B
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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
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
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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
- H01Q15/14—Reflecting surfaces; Equivalent structures
Abstract
The invention belongs to a broadband circular polarized antenna, and provides a broadband circular polarized antenna with filtering characteristics, which comprises a coaxial line, a dielectric plate and a reflecting plate which is arranged at intervals with the dielectric plate, wherein two surfaces of the dielectric plate are respectively provided with two dipoles, two split resonant rings and two parasitic patches, the two parasitic patches are positioned on a first surface of the dielectric plate, the two parasitic patches are respectively positioned at two adjacent corners of the dielectric plate, one split resonant ring is positioned between the two parasitic patches, the other split resonant ring is arranged adjacent to any parasitic patch, the two dipoles are mutually perpendicular, one end of each split resonant ring is coupled, the other end of each split resonant ring is connected with the reflecting plate through a wavelength delay line, one end of the coaxial line is connected with the reflecting plate, and the other end of each coaxial line is connected with the dipole.
Description
Technical Field
The invention belongs to a broadband circularly polarized antenna, and particularly relates to a broadband circularly polarized antenna with filtering characteristics.
Background
With the development of wireless communication technology, broadband communication technology has also been developed for a long time, and thus, compact broadband circularly polarized antennas have been widely studied as an important component in broadband communication.
In practical engineering application, circular polarization has the advantages of restraining multipath fading, reducing polarization mismatch and being free from Faraday rotation effect, and is widely applied to global positioning systems, radio frequency identification and wireless local area networks. For wide bandwidths, the antenna size is generally large, and therefore, the size characteristics are a technology for continuously pursuing breakthrough along with the broadband characteristics. The size of the antenna greatly affects the overall size of the system, considering that the antenna is ultimately integrated into the system. Therefore, the design of the compact broadband circularly polarized antenna has important significance for reducing the size of the radio frequency front end.
In recent years, cross dipole antennas have been widely studied for their excellent circular polarization characteristics. In 2017, chinese scholars Feng Guirong proposed a cross dipole antenna with an asymmetric cross loop structure, and the cross dipoles with unequal lengths and the asymmetric cross loops are combined to generate three circular polarization points, so as to realize wideband circular polarization. The circular polarization width was achieved in 2019 by xianning Liang et al using an L-shaped cross dipole in combination with the two modes. In the same year, LEI WANG scholars introduce eight parasitic patches around the dipole, creating multiple resonant modes that extend the circularly polarized bandwidth of the antenna. The cross dipole antenna provided above expands the circular polarization bandwidth, but the size increases with it, and has no frequency selective characteristic.
Disclosure of Invention
The invention provides a broadband circularly polarized antenna with filtering characteristics, which aims to solve the technical problems that the size of the existing cross dipole antenna is increased along with the circular polarized bandwidth although the circular polarized bandwidth is expanded and the frequency selection characteristics are not generated.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the broadband circularly polarized antenna with the filtering characteristic is characterized by comprising coaxial lines, rectangular dielectric plates and reflecting plates which are arranged in parallel with the dielectric plates at intervals through supporting pieces;
two surfaces of the dielectric plate are respectively provided with two dipoles, two rectangular split resonant rings and two rectangular parasitic patches;
the surface, far away from the reflecting plate, of the dielectric plate is a first surface of the dielectric plate, and the surface, facing the reflecting plate, of the dielectric plate is a second surface of the dielectric plate;
the two parasitic patches are respectively positioned at two adjacent corners of the dielectric plate, one split resonant ring is positioned between the two parasitic patches, and the other split resonant ring is arranged adjacent to any parasitic patch, so that the two split resonant rings and two sides of one parasitic patch, which are far away from the edge of the dielectric plate, are arranged adjacent to each other, the two dipoles are arranged in a mutually perpendicular manner, one end of each dipole is respectively coupled with one split resonant ring, and the other end of each dipole is connected with the center of the dielectric plate through a wavelength delay line;
the projection of the dipole, the split resonant ring and the parasitic patch on the second surface of the dielectric plate on the first surface of the dielectric plate is symmetrical with the arrangement positions of the dipole, the split resonant ring and the parasitic patch on the first surface of the dielectric plate with respect to the center of the dielectric plate;
the outer contour formed by the projection of the dipole, the split resonant ring and the parasitic patch on the first surface of the dielectric plate and the projection of the dipole, the split resonant ring and the parasitic patch on the second surface of the dielectric plate together with the dipole, the split resonant ring and the parasitic patch on the second surface of the dielectric plate is rectangular, and the projection of the two split resonant rings on the first surface of the dielectric plate and the two split resonant rings on the second surface of the dielectric plate are respectively positioned at the centers of all sides of the dielectric plate;
one end of the coaxial line is connected with an SMA connector and is connected with the reflecting plate; the other end of the inner conductor is connected with the dipole on the first surface of the dielectric plate, and the outer conductor is connected with the dipole on the second surface of the dielectric plate.
Further, the parasitic patch is a parasitic corner cut patch.
Further, the corner cut of the parasitic patch is positioned at the corner of the parasitic patch, which is close to the center of the dielectric plate.
Further, the reflecting plate and the dielectric plate are both square, the side length L of the reflecting plate is 100mm plus or minus 0.1mm, the side length w of the dielectric plate is 90mm plus or minus 0.1mm, the thickness H1 of the dielectric plate is 0.8mm plus or minus 0.1mm, and the distance H between the reflecting plate and the dielectric plate is 37.6mm plus or minus 0.1mm.
Further, the arm length L1 of the dipole is 23.5mm plus or minus 0.1mm, and the arm width W1 of the dipole is 3.1mm plus or minus 0.1mm.
Further, the inner diameter R0 of the wavelength extension line is 4.6mm plus or minus 0.1mm, and the outer diameter R1 is 4.8mm plus or minus 0.1mm.
Further, the open width W3 of the open resonance ring is 3.5mm plus or minus 0.02mm, the outer diameter L2 of the open resonance ring is 23mm plus or minus 0.1mm, and the inner diameter W2 of the open resonance ring is 17mm plus or minus 0.1mm.
Further, the parasitic patch is square, the side length L3 is 23mm plus or minus 0.1mm, and the chamfer length W4 is 6.5mm plus or minus 0.1mm.
Further, the dielectric plate has a dielectric constant of 4.4, a loss angle of 0.02 and a thickness of 0.8.
Further, the dielectric plate is a glass fiber epoxy resin dielectric plate; the medium plate is arranged at intervals with the reflecting plate through a supporting piece formed by four nylon columns.
Compared with the prior art, the invention has the beneficial effects that:
1. the broadband circularly polarized antenna has the advantages that the reflection coefficient with the filtering characteristic is formed through the interaction of the wavelength delay line, the crossed dipole and the split resonant ring, the suppression of out-of-band (beyond 1.38-2.86 GHz) interference signals is realized, the return loss of the broadband circularly polarized antenna in the whole frequency band of 1.38-2.86GHz is less than-10 dBm, the antenna has good frequency selection characteristics on the upper side band and the lower side band, the out-of-band signal suppression is good, and the filtering effect is good.
2. The broadband circularly polarized antenna has the axial ratio of less than 3dB in the frequency band of 1.43-2.54GHz, good circularly polarized characteristic, and the directional diagram of the antenna mainly has upward energy, and compared with the same type of antenna, the broadband circularly polarized antenna improves the impedance bandwidth and the circularly polarized bandwidth of the antenna on the premise of not increasing the size of the antenna, and simultaneously improves the frequency selection characteristics of the upper side band and the lower side band. In addition, the antenna of the invention also improves the suppression of out-of-band interference signals, introduces directional characteristics, and is flexible in application places in a wireless communication system.
3. The parasitic patch adopts the parasitic corner cut patch, and the parasitic corner cut patch is proved to be capable of effectively improving the filtering characteristic of the antenna and increasing the bandwidth.
4. In the invention, parameters of the reflecting plate, the dielectric plate, the dipole, the wavelength extension line, the split resonant ring and the parasitic patch are reasonably designed, so that the antenna performance of the invention is optimized.
Drawings
FIG. 1 is a schematic diagram of a wideband circularly polarized antenna with filtering characteristics according to an embodiment of the present invention (wherein the dashed line represents the placement of devices on the second surface of the dielectric sheet and the solid line represents the placement of devices on the first surface of the dielectric sheet);
FIG. 2 is a side view of FIG. 1 of the present invention;
FIG. 3 is a graph of reflectance test results for the embodiment of FIG. 1 in accordance with the present invention;
FIG. 4 is a graph of axial ratio test results for the embodiment of FIG. 1 in accordance with the present invention;
FIG. 5 is a graph of gain test results for the embodiment of FIG. 1 in accordance with the present invention;
FIG. 6 is a polar diagram at 1.65GHz for the embodiment of FIG. 1 in accordance with the present invention;
FIG. 7 is a polar diagram at 2GHz for the embodiment of FIG. 1 in accordance with the present invention;
fig. 8 is a polar diagram of the embodiment of fig. 1 of the present invention at 2.55 GHz.
The antenna comprises a 1-dielectric plate, a 2-dipole, a 3-wavelength delay line, a 4-split resonant ring, a 5-parasitic patch, a 6-reflecting plate, a 7-nylon column, an 8-coaxial line and a 9-SMA connector.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention and the accompanying drawings, and it is apparent that the described embodiments do not limit the present invention.
Referring to fig. 1 and 2, the present invention provides a compact broadband circularly polarized cross dipole antenna, which can reduce the resonant frequency without increasing the antenna size by designing the split resonant ring 4, thereby achieving the purpose of miniaturization of the antenna. In addition to this, the combination of the dipole 2, the split ring 4 and the corner cut parasitic patch 5 achieves a wide axial ratio performance and a filter characteristic.
As shown in fig. 1 and 2, an embodiment of the wideband circularly polarized antenna of the invention includes a coaxial line 8, a rectangular dielectric plate 1, and a reflecting plate 6 spaced from the dielectric plate 1, where the reflecting plate 6 is located below the dielectric plate 1 to realize unidirectional radiation. The two surfaces of the dielectric plate 1 are respectively provided with two dipoles 2, two split resonant rings 4 and two parasitic patches 5, the split resonant rings 4, the parasitic patches, the dielectric plate 1 and the reflecting plate 6 are rectangular, in this embodiment of the invention, the parasitic patches 5 are parasitic corner cut patches, and the corner cuts are positioned at corners of the rectangular parasitic patches close to the dielectric plate 1.
The surface of the dielectric plate 1 facing away from the reflecting plate 6 is defined as a dielectric plate first surface, and the surface of the dielectric plate 1 facing toward the reflecting plate 6 is defined as a dielectric plate second surface. Because the two dipoles 2, the two split resonant rings 4 and the two parasitic patches 5 are projected on the first surface of the dielectric plate at the arrangement positions on the second surface of the dielectric plate, and the two dipole elements and the two parasitic patches are symmetrical with respect to the center of the dielectric plate 1 at the arrangement positions on the first surface of the dielectric plate, the arrangement conditions on the second surface of the dielectric plate can be clarified by introducing the arrangement positions on the first surface of the dielectric plate as follows:
the two parasitic patches 5 are respectively positioned at two adjacent corners of the dielectric plate 1, the distances between the two parasitic patches 5 and the corresponding corners are the same, the specific distances can be adjusted according to practical situations, one split resonant ring 4 is positioned between the two parasitic patches 5, the other split resonant ring 4 is arranged adjacent to any one parasitic patch 5, so that the two split resonant rings 4 and any one parasitic patch 5 are arranged adjacent to two sides of the edge of the dielectric plate 1, which is far away from the edge of the dielectric plate 1, the split resonant ring 4 and the parasitic patches 5 form broadband circular polarization characteristics, the two dipoles 2 are mutually perpendicular, one ends of the dipoles are respectively extended into one split resonant ring 4 and are coupled with the corresponding split resonant ring 4, the reflection coefficient and the axial ratio bandwidth with the filtering characteristics are the same, the sizes of the four split resonant rings 4 are the same, the other ends of the split resonant rings are connected through the wavelength delay line 3 at the center of the dielectric plate 1, and the length of the wavelength delay line 3 is one quarter wavelength.
From this, the placement of the dipoles 2, the split ring 4 and the parasitic patch 5 on the second surface of the dielectric plate is known, and the two dipoles 2 on the second surface of the dielectric plate are also connected by the corresponding retarder 3.
The projections of the dipole 2, the split resonant ring 4 and the parasitic patch 5 on the first surface of the dielectric plate and the outer contour formed by the dipole 2, the split resonant ring 4 and the parasitic patch 5 on the second surface of the dielectric plate are rectangular, and the projections of the two split resonant rings 4 on the first surface of the dielectric plate and the two split resonant rings 4 on the second surface of the dielectric plate are respectively positioned at the centers of the sides of the dielectric plate 1.
The dielectric plate 1 is arranged at intervals with the reflecting plate 6 through the support of four nylon posts 7, one end of the coaxial line 8 is connected with an SMA connector 9 which is connected with the reflecting plate 6, the SMA connector 9 is welded and fixed with the coaxial line 8, the SMA connector 9 is propped against the surface of the reflecting plate 6 far away from the dielectric plate 1, the broken outer surface of the coaxial line 8 is welded with the reflecting plate 6, the inner conductor at the other end of the coaxial line 8 is connected with the dipole 2 on the first surface of the dielectric plate, and the outer conductor is connected with the dipole 2 on the second surface of the dielectric plate.
Among them, the dielectric plate 1 is selected from epoxy resin plates or other plates using microwave frequency bands, such as Rogers, ceramics, etc., and glass fiber epoxy resin (FR 4) dielectric plates having a dielectric constant of 4.4, a loss angle of 0.02, and a thickness of 0.8mm are preferable in view of cost and universality of antennas. The inner and outer conductors of the 50Ω coaxial line 8 having SMA connectors are connected to the dipoles 2 on the first surface of the dielectric plate and the second surface of the dielectric plate, respectively, and the dipoles 2 and the retarder 3 can form a crossed dipole having a phase difference of 90 ° to radiate circularly polarized waves. Without increasing the size, the split resonant ring 4 is coupled with the cross dipole, so that the current path is prolonged, a plurality of resonant points are introduced to expand the bandwidth, circular polarization points are introduced, and parasitic patches 5 are loaded around the split resonant ring 4 to generate broadband circular polarization. The reflecting plate 6 at a quarter wavelength from the lower side of the dielectric plate 1 serves as a reflecting surface to give directivity to the antenna.
The present invention introduces high frequency axis ratio point and frequency selective characteristics, mainly through the wide impedance bandwidth formed by the crossed dipole (formed by dipole 2 and the wave delay line 3) and the split ring resonator 4. The introduction of parasitic patches 5 around the split ring 4, combined with the axial ratio point, creates a broadband circular polarization performance.
In one embodiment of the present invention, the effective size ranges of the respective parts of the above structure are:
the reflection plate 6 has a square shape with a side length l=100 mm±0.1mm, and a distance H between the reflection plate 6 and the dielectric plate 1 is 37.6mm±0.1mm.
The dielectric plate 1 is square, the side length is 90mm plus or minus 0.1mm, and the thickness H1 of the dielectric plate 1 is 0.8mm plus or minus 0.1mm.
Arm length l1=23.5 mm±0.1mm, arm width w1=3.1 mm±0.1mm of the dipole;
the inner diameter r0=4.6mm±0.1mm and the outer diameter r1=4.8mm±0.1mm of the wavelength delay line 3.
The split width w3=3.5 mm±0.02mm of the split ring 4, the outer diameter l2=23 mm±0.1mm of the split ring 4, and the inner diameter w2=17 mm±0.1mm.
The length l3=23 mm±0.1mm of the parasitic patch 5, and the chamfer length w4=6.5±0.1mm.
The antenna test results of this embodiment of the invention are as follows:
FIG. 3 is a graph of the reflection coefficient test results of the wideband circularly polarized antenna of the invention, wherein the ordinate in the graph is the reflection coefficient, and the abscissa is the frequency, and the bandwidth of-10 dB reflection coefficient is the receivable/transmittable frequency range, which is 1.38 GHz to 2.86GHz, so as to meet the requirement of the wideband receiving/transmitting frequency range. The reflection coefficient of the antenna is steeper in the upper and lower sidebands, and the antenna has better frequency selection characteristic.
Fig. 4 is a graph of axial ratio test results of a wideband circularly polarized antenna of the invention, wherein the ordinate in the graph is axial ratio coefficient, and the abscissa is frequency, and the bandwidth of 3dB axial ratio is the receivable/transmittable frequency range, which is 1.43-2.54GHz, and meets the requirement of wideband receiving/transmitting frequency range.
Fig. 5 is a graph of gain test results for a wideband circularly polarized antenna of the present invention, with gain coefficients on the ordinate and frequencies on the abscissa, where the gain is around 7dBi in the receivable/transmittable frequency range (1.43-2.54 GHz).
Fig. 6-8 are left-right hand polar coordinate patterns of the broadband antenna of the invention in the 1.5GHz, 2GHz and 2.5GHz frequency bands, respectively. From the two patterns of the horizontal plane and the vertical plane in the frequency bands of 1.5GHz, 2GHz and 2.5GHz, the antenna provided by the invention has good right-handed radiation characteristics and good directional radiation characteristics.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the present invention and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A wideband circularly polarized antenna with filtering characteristics, characterized by: comprises a coaxial line (8), a rectangular dielectric plate (1) and a reflecting plate (6) which is arranged in parallel with the dielectric plate (1) at intervals through a supporting piece;
two surfaces of the dielectric plate (1) are respectively provided with two dipoles (2), two rectangular split resonant rings (4) and two rectangular parasitic patches (5);
the surface of the dielectric plate (1) far away from the reflecting plate (6) is a first surface of the dielectric plate, and the surface of the dielectric plate (1) facing the reflecting plate (6) is a second surface of the dielectric plate;
the two parasitic patches (5) are respectively positioned at two adjacent corners of the dielectric plate (1), one split resonant ring (4) is positioned between the two parasitic patches (5), the other split resonant ring (4) is arranged adjacent to any parasitic patch (5), so that the two split resonant rings (4) and two sides of one parasitic patch (5) far away from the edge of the dielectric plate (1) are arranged adjacent, the two dipoles (2) are arranged vertically to each other, one end of each dipole (2) is respectively coupled with one split resonant ring (4), and the other end of each dipole is connected with the center of the dielectric plate (1) through a wavelength delay line (3);
the projection of the dipole (2), the split resonant ring (4) and the parasitic patch (5) on the second surface of the dielectric plate on the first surface of the dielectric plate is symmetrical with the arrangement positions of the dipole (2), the split resonant ring (4) and the parasitic patch (5) on the first surface of the dielectric plate with respect to the center of the dielectric plate (1);
the projections of the dipoles (2), the split resonant rings (4) and the parasitic patches (5) on the first surface of the dielectric plate on the second surface of the dielectric plate, the outer contour formed by the dipoles (2), the split resonant rings (4) and the parasitic patches (5) on the second surface of the dielectric plate are rectangular, and the projections of the two split resonant rings (4) on the first surface of the dielectric plate and the two split resonant rings (4) on the second surface of the dielectric plate are respectively positioned at the centers of all sides of the dielectric plate (1);
one end of the coaxial line (8) is connected with an SMA connector (9) and is connected with the reflecting plate (6); the other end of the inner conductor is connected with a dipole (2) on the first surface of the dielectric plate, and the outer conductor is connected with the dipole (2) on the second surface of the dielectric plate.
2. A wideband circularly polarized antenna with filtering characteristics as recited in claim 1, wherein: the parasitic patch (5) is a parasitic corner cut patch.
3. A wideband circularly polarized antenna with filtering characteristics as claimed in claim 2, wherein: the corner cut of the parasitic patch (5) is positioned at the corner of the parasitic patch, which is close to the center of the dielectric plate (1).
4. A wideband circularly polarized antenna with filtering characteristics as claimed in claim 2 or 3, wherein: the reflection plate (6) and the medium plate (1) are both square, the side length L of the reflection plate (6) is 100mm plus or minus 0.1mm, the side length w of the medium plate (1) is 90mm plus or minus 0.1mm, the thickness H1 of the medium plate (1) is 0.8mm plus or minus 0.1mm, and the distance H between the reflection plate (6) and the medium plate (1) is 37.6mm plus or minus 0.1mm.
5. A wideband circularly polarized antenna with filtering characteristics as recited in claim 4, wherein:
the arm length L1 of the dipole (2) is 23.5mm plus or minus 0.1mm, and the arm width W1 of the dipole (2) is 3.1mm plus or minus 0.1mm.
6. A wideband circularly polarized antenna with filtering characteristics as recited in claim 5, wherein:
the inner diameter R0 of the wavelength delay line (3) is 4.6mm plus or minus 0.1mm, and the outer diameter R1 is 4.8mm plus or minus 0.1mm.
7. A wideband circularly polarized antenna with filtering characteristics as recited in claim 6, wherein:
the width W3 of the split resonance ring (4) is 3.5mm plus or minus 0.02mm, the outer diameter L2 of the split resonance ring (4) is 23mm plus or minus 0.1mm, and the inner diameter W2 of the split resonance ring (4) is 17mm plus or minus 0.1mm.
8. A wideband circularly polarized antenna with filtering characteristics as recited in claim 7, wherein:
the parasitic patch (5) is square, the side length L3 is 23mm plus or minus 0.1mm, and the chamfer length W4 is 6.5mm plus or minus 0.1mm.
9. A wideband circularly polarized antenna with filtering characteristics as recited in claim 8, wherein: the dielectric plate (1) has a dielectric constant of 4.4, a loss angle of 0.02 and a thickness of 0.8.
10. A wideband circularly polarized antenna with filtering characteristics as recited in claim 9, wherein: the dielectric plate (1) is a glass fiber epoxy resin dielectric plate; the dielectric plate (1) is arranged at intervals with the reflecting plate (6) through a supporting piece formed by four nylon columns (7).
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| CN202111199669.4A CN113964494B (en) | 2021-10-14 | 2021-10-14 | Broadband circularly polarized antenna with filtering characteristic |
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| CN202111199669.4A CN113964494B (en) | 2021-10-14 | 2021-10-14 | Broadband circularly polarized antenna with filtering characteristic |
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| CN113964494B true CN113964494B (en) | 2023-10-03 |
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|---|---|---|---|---|
| CN106684543A (en) * | 2016-12-08 | 2017-05-17 | 华南理工大学 | Low-profile, bandwidth, circularly polarized cross-dipole antenna |
| CN108711672A (en) * | 2018-04-28 | 2018-10-26 | 西安电子科技大学 | A kind of polarization reconfigurable broad band cross dipole antenna |
| CN110854522A (en) * | 2019-11-27 | 2020-02-28 | 吉林医药学院 | Implanted small circularly polarized antenna loaded with octagonal complementary split resonant ring |
| KR102176044B1 (en) * | 2019-07-29 | 2020-11-06 | 주식회사 에스원 | Dipole Antenna with Switching Means For Circular Polarization UWB |
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2021
- 2021-10-14 CN CN202111199669.4A patent/CN113964494B/en active Active
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| CN106684543A (en) * | 2016-12-08 | 2017-05-17 | 华南理工大学 | Low-profile, bandwidth, circularly polarized cross-dipole antenna |
| CN108711672A (en) * | 2018-04-28 | 2018-10-26 | 西安电子科技大学 | A kind of polarization reconfigurable broad band cross dipole antenna |
| KR102176044B1 (en) * | 2019-07-29 | 2020-11-06 | 주식회사 에스원 | Dipole Antenna with Switching Means For Circular Polarization UWB |
| CN110854522A (en) * | 2019-11-27 | 2020-02-28 | 吉林医药学院 | Implanted small circularly polarized antenna loaded with octagonal complementary split resonant ring |
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