CN213845512U - Broadband Circularly Polarized Antenna Based on Artificial Magnetic Conductor - Google Patents
Broadband Circularly Polarized Antenna Based on Artificial Magnetic Conductor Download PDFInfo
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- CN213845512U CN213845512U CN202023073252.7U CN202023073252U CN213845512U CN 213845512 U CN213845512 U CN 213845512U CN 202023073252 U CN202023073252 U CN 202023073252U CN 213845512 U CN213845512 U CN 213845512U
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Abstract
一种基于人工磁导体的宽带圆极化天线，包括：上介质基板、下介质基板、支撑柱、主辐射结构、用于降低天线剖面的人工磁导体单元和底板，上介质基板通过支撑柱与下介质基板相连并设置于下介质基板上端，主辐射结构两端设置于上介质基板的上下两侧，人工磁导体单元周期设置于下介质基板上端，底板设置于下介质基板下端；主辐射结构包括正交分布的两个相同偶极子，两个偶极子以90°的相位延迟线在上介质基板同一侧相连接，辐射波幅度相同且相位差为90°。本实用新型在天线剖面降低的情况下显著改善了阻抗带宽和轴比带宽，并大幅提高了轴向增益，具有低成本及宽带高增益的优势，可应用于对增益需求较高的远距离通信系统的接收和发射设备中，可以得到很好的圆极化性能。
A broadband circularly polarized antenna based on an artificial magnetic conductor, comprising: an upper dielectric substrate, a lower dielectric substrate, a support column, a main radiation structure, an artificial magnetic conductor unit and a bottom plate for reducing the antenna section, and the upper dielectric substrate is connected to the support column through the support column. The lower dielectric substrate is connected and arranged on the upper end of the lower dielectric substrate, the two ends of the main radiating structure are arranged on the upper and lower sides of the upper dielectric substrate, the artificial magnetic conductor unit is periodically arranged on the upper end of the lower dielectric substrate, and the bottom plate is arranged on the lower end of the lower dielectric substrate; the main radiation structure Including two identical dipoles distributed orthogonally, the two dipoles are connected by a 90° phase delay line on the same side of the upper dielectric substrate, the radiation wave amplitude is the same and the phase difference is 90°. The utility model significantly improves the impedance bandwidth and the axial ratio bandwidth under the condition that the antenna profile is reduced, and greatly improves the axial gain, and has the advantages of low cost and wide bandwidth and high gain, and can be applied to long-distance communication with high gain requirements. In the receiving and transmitting equipment of the system, good circular polarization performance can be obtained.
Description
Technical Field
The utility model relates to an electromagnetic field and microwave field's technique specifically are a broadband circular polarized antenna based on artifical magnetic conductor that can be used to mobile communication.
Background
The circularly polarized antenna has the advantages of eliminating polarization mismatch, inhibiting multipath interference and the like, and has important application in the aspects of satellite communication, global positioning systems, radio frequency identification, wireless local area networks, radars, electronic countermeasures, electronic reconnaissance and the like. As modern wireless communication systems require higher and higher transmission speeds to support the data transmission demands, which have increased explosively, wideband circularly polarized antennas have gained significant research significance. The traditional microstrip patch antenna can generate two linear polarized waves with equal amplitude and orthogonal phase through technical means such as corner cutting, surface slotting and the like to form circularly polarized radiation, but the circularly polarized bandwidth is generally narrow. In order to improve the axial gain, an antenna array is usually constructed by using multiple antennas, which introduces a complex feeding network and increases the design difficulty.
Different from the traditional microstrip patch circular polarization antenna, the cross dipole circular polarization antenna often has broadband performance and higher gain, but the distance between the metal back plate and the main radiation structure of the antenna often needs one quarter of working wavelength, so that the size of the antenna is greatly increased, and the high-profile antenna has larger wind resistance during installation, and is not beneficial to practical application.
SUMMERY OF THE UTILITY MODEL
The utility model provides a to the above-mentioned shortcoming that prior art exists, propose a broadband circular polarized antenna based on artifical magnetic conductor, adopt two the same dipoles that have full-wave length as the main radiation structure, in order to realize the feed, the dipole arm is designed for the multilayer echelonment to introduce the corner cut in the outer corner, improved the impedance matching characteristic of antenna by a wide margin, obtained the work bandwidth wider than the half-wave dipole; the artificial magnetic conductor unit is introduced to effectively reduce the antenna profile and remarkably improve the impedance bandwidth and the axial ratio bandwidth; the single-port feed has the characteristic of high broadband gain.
The utility model discloses a realize through following technical scheme:
the utility model discloses a: go up dielectric substrate, lower dielectric substrate, support column, main radiation structure, be used for reducing the artifical magnetic conductor unit and the bottom plate of antenna section, wherein: the upper dielectric substrate is connected with the lower dielectric substrate through the support columns and is arranged at the upper end of the lower dielectric substrate, two ends of the main radiation structure are arranged at the upper side and the lower side of the upper dielectric substrate, the artificial magnetic conductor unit period is arranged at the upper end of the lower dielectric substrate, and the bottom plate is arranged at the lower end of the lower dielectric substrate.
The main radiation structure comprises two dipoles which are orthogonally arranged, the distance between two ends of each dipole is close to one wavelength, a pair of mutually vertical dipoles are connected on the same side of the upper dielectric substrate through a phase delay line with the wavelength of 1/4, the formed radiation waves have the same amplitude and the phase difference is 90 degrees, and circular polarization radiation is realized.
The dipole is composed of two dipole arms arranged in central symmetry, and the four dipole arms of the two dipoles are arranged in central symmetry and are mutually spaced by 90 degrees.
The two dipole arms arranged in central symmetry are respectively printed on the upper side and the lower side of the upper dielectric substrate, the black part is positioned on the upper side of the dielectric substrate, and the gray part is positioned on the lower side of the dielectric substrate.
The width of each dipole arm is gradually increased to form a multi-layer ladder structure.
The outer corners of each dipole arm are provided with cut corners for improving impedance matching characteristics.
An air layer is arranged between the upper medium substrate and the lower medium substrate.
The artificial magnetic conductor unit is a rectangular patch array arrangement structure, and gaps are arranged between patches.
The bottom plate is square, and the thickness of the bottom plate is the same as that of the dipole and the artificial magnetic conductor unit.
Technical effects
Compared with the prior art, the utility model discloses showing under the circumstances that the antenna section reduces and having improved impedance bandwidth and axial ratio bandwidth, adopting single port feed, simple structure has the characteristics of broadband high-gain under the circumstances that does not introduce complicated feed network, can be applied to in all kinds of wireless communication system's receiving and transmitting equipment, can obtain fine circular polarization performance.
Drawings
Fig. 1 is a side view of the present invention;
fig. 2 is a top view of the present invention;
fig. 3 is a graph of simulation and test curves for the S11 parameter of the present invention;
FIG. 4 is a graph showing the simulation and test of axial ratio parameters of the present invention;
fig. 5 is a graph showing simulation and test curves of gain parameters according to the present invention;
fig. 6 is a normalized radiation pattern of the present invention;
in the figure: a is 4.6GHz, b is 6.0GHz, c is 8.0 GHz; the device comprises a main radiation structure upper half part 1, an upper dielectric substrate 2, a main radiation structure lower half part 3, a support column 4, an air layer 5, an artificial magnetic conductor 6, a lower dielectric substrate 7, a bottom plate 8, a single dipole arm 9, a chamfer 10, a main radiation structure 11, a phase delay line 12 and a dipole 13;
Detailed Description
As shown in fig. 1, the present embodiment relates to a broadband circular polarization antenna based on an artificial magnetic conductor, which includes: go up dielectric substrate 2, lower dielectric substrate 7, be used for increasing structural stability and fixed air layer thickness's support column 4, main radiation structure upper half 1, main radiation structure lower half 3, be used for reducing the artifical magnetic conductor unit 6 and the bottom plate 8 of antenna section, wherein: the upper dielectric substrate 2 is connected with the lower dielectric substrate 7 through the support column 4 and is arranged at the upper end of the lower dielectric substrate 7, two ends of the main radiation structure 11 are arranged at the upper side and the lower side of the upper dielectric substrate 2 so as to feed electricity, the artificial magnetic conductor units 6 are periodically arranged at the upper end of the lower dielectric substrate 7, and the bottom plate 7 is arranged at the lower end of the lower dielectric substrate 6.
As shown in fig. 2, the main radiating structure 11 includes two dipoles 13 arranged orthogonally, and the distance between two ends of the dipoles 13 is close to one wavelength, and a pair of mutually perpendicular dipoles are connected with a phase delay line 12 with a length of 1/4 wavelengths on the same side of the upper dielectric substrate 2, so that the formed radiation waves have the same amplitude and a phase difference of 90 °, and circular polarization radiation is realized.
The dipole 13 is composed of two dipole arms 9 arranged in central symmetry, and the four dipole arms 9 of the two dipoles 13 are arranged in central symmetry and are spaced by 90 degrees.
The two dipole arms 9 with central symmetry are respectively printed on the upper and lower sides of the upper dielectric substrate 2, the black part is located on the upper side of the dielectric substrate 2, and the gray part is located on the lower side of the dielectric substrate 2.
The width of each dipole arm 9 is gradually increased to form a multi-layer ladder structure.
The outer corners of each dipole arm 9 are provided with cut corners 10 for improving impedance matching characteristics.
An air layer 5 with the thickness of 3mm is arranged between the upper dielectric substrate 2 and the lower dielectric substrate 7.
The total length l1 of the dipole arm is 25mm, the terminal width w1 of the dipole arm is 27mm, the radius of the phase delay line circular ring is 2.4mm, and the width of the phase delay line circular ring is 0.4 mm.
The artificial magnetic conductor 6 is a square patch with the size of 6.6mm by 6.6mm and is arranged according to an 8 by 8 array structure, and a gap of 1mm is arranged between the square patches.
The bottom plate 8 is a square copper layer, the thickness of the copper layer is the same as that of the main radiation structure 11 and the artificial magnetic conductor 6, and the thickness of the copper layer is 0.018 mm.
The upper dielectric substrate 2 is 70mm square, made of Rogers5880, 2.2 in dielectric constant and 0.762mm in thickness.
The lower dielectric substrate 7 is 80mm square, made of Rogers5880, 3.48 in dielectric constant and 3.125mm in thickness.
The utility model discloses the feed mode adopts the coaxial feed of single port, and coaxial line inner conductor connects main radiation structure first half 1, and the outer conductor connects main radiation structure the latter half 3 and bottom plate 8.
As shown in fig. 4, the simulation of the embodiment is more consistent with the tested S11 parameter, and the test result has a slight frequency deviation in the high frequency part, which is caused by practical processing and experimental error. The 10dB impedance bandwidth tested was 74% and the simulation results were 72%.
As shown in fig. 5, the simulation of this embodiment is more consistent with the tested 3dB axial ratio parameter, the tested 3dB axial ratio bandwidth is 67.7% and the simulation result is 62.5%, and the tested axial ratio pass band is entirely located in the impedance pass band, so all the tested axial ratio pass bands are available bandwidths.
As shown in FIG. 6, the simulation of the present embodiment is consistent with the tested gain curve, and the average gain in the test pass band is 10.69 dBi.
As shown in a, b and c of fig. 6, in the normalized radiation pattern of three different frequencies 4.6GHz, 6.0GHz and 8.0GHz in the pass band, as the frequency increases, the beam of the antenna becomes narrower, and the axial gain increases first and then decreases, the maximum radiation direction of the antenna remains directly above the radiator, and the main polarization is more than 15dBi greater than the cross polarization.
The whole size of the broadband circularly polarized antenna is 1.4 lambda0*1.4λ0*0.14λ0(wherein:. lambda.0Wavelength at center frequency), the impedance bandwidth can reach 74%, the axial ratio bandwidth of 3dB can reach 67.7%, and the in-band peak gain reaches 12.1 dBi.
The real broadband circularly polarized antenna has a simple structure, does not use a complex feed network, introduces an artificial magnetic conductor structure to greatly reduce the height of the antenna, can be applied to receiving and transmitting equipment of various wireless communication systems, and can obtain good circularly polarized performance.
Compared with the conventional practical half-wave length dipole as a radiator, the utility model adopts the full-wave length dipole as a main radiator, thereby widening the bandwidth; in order to realize impedance matching of the full-wave length dipole, a multi-layer stepped structure is adopted as a dipole arm; the chamfer is introduced for further improving the impedance matching characteristic of the dipole; based on the improvement, the bandwidth realized by the conventional means can reach about 50 percent at most, and the utility model discloses bandwidth more than 60 percent has been reached; because a full-wave length dipole structure is adopted, the axial gain obtained without introducing a complex feed network is higher than that obtained by a conventional method by more than 2 dBi.
The foregoing embodiments may be modified in various ways by those skilled in the art without departing from the spirit and scope of the present invention, which is not limited by the above embodiments but is to be accorded the full scope defined by the appended claims, and all such modifications and variations are within the scope of the invention.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023073252.7U CN213845512U (en) | 2020-12-18 | 2020-12-18 | Broadband Circularly Polarized Antenna Based on Artificial Magnetic Conductor |
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| CN202023073252.7U CN213845512U (en) | 2020-12-18 | 2020-12-18 | Broadband Circularly Polarized Antenna Based on Artificial Magnetic Conductor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113644432A (en) * | 2021-10-18 | 2021-11-12 | 成都锐芯盛通电子科技有限公司 | Dual circularly polarized phased array antenna array |
| CN114256616A (en) * | 2021-12-30 | 2022-03-29 | 中国科学院微电子研究所 | An antenna unit and antenna array |
| CN114824780A (en) * | 2022-06-29 | 2022-07-29 | 南通至晟微电子技术有限公司 | Closely arranged low mutual coupling patch antenna |
-
2020
- 2020-12-18 CN CN202023073252.7U patent/CN213845512U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113644432A (en) * | 2021-10-18 | 2021-11-12 | 成都锐芯盛通电子科技有限公司 | Dual circularly polarized phased array antenna array |
| CN114256616A (en) * | 2021-12-30 | 2022-03-29 | 中国科学院微电子研究所 | An antenna unit and antenna array |
| CN114824780A (en) * | 2022-06-29 | 2022-07-29 | 南通至晟微电子技术有限公司 | Closely arranged low mutual coupling patch antenna |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210730 Termination date: 20211218 |
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| CF01 | Termination of patent right due to non-payment of annual fee |