CN112736438A - Dual-band dielectric resonant antenna with optimized super-surface circular polarization - Google Patents
Dual-band dielectric resonant antenna with optimized super-surface circular polarization Download PDFInfo
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- CN112736438A CN112736438A CN202011534694.9A CN202011534694A CN112736438A CN 112736438 A CN112736438 A CN 112736438A CN 202011534694 A CN202011534694 A CN 202011534694A CN 112736438 A CN112736438 A CN 112736438A
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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
- 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
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/20—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements characterised by the operating wavebands
Abstract
The application provides a dual-band dielectric resonant antenna with optimized super-surface circular polarization, and relates to the design of dielectric resonant antennas. The invention consists of a substrate, a rectangular dielectric resonator, a super surface, a circular patch and a coaxial probe. The metal rectangle in a unit structure of the super surface and the material of the substrate (1) with the same area below form a self-complementary structure together; the dimensions of the super-surface were 8.76mm by 2.5mm, the lateral spacing of each rectangular cell was 1.835mm, and the longitudinal spacing was 5.125 mm; the transmission (reflection) coefficients of two orthogonal linear polarizations from the complementary super-surface are constantly 90 ° out of phase. The circularly polarized working mode is well realized, and the method can be used for radar and electronic countermeasure.
Description
Technical Field
The application relates to the field of dielectric resonant antennas, in particular to a dual-band dielectric resonant antenna with super-surface circular polarization.
Background
In the microwave frequency band, the performance of the dielectric resonance antenna is superior to that of a microstrip antenna. Because the dielectric resonant antenna is metal lossless, low loss can still be realized in a high-frequency wave band, the dielectric resonant antenna can be made into different shapes to meet the requirements of different scenes, and feeding can be performed in various modes, so that the design is flexible.
Because the circularly polarized antenna has good penetrating power and a large radiation range, the circularly polarized antenna is more and more valued by people. It has important application in the fields of communication, radar, electronic countermeasure, broadcast television, electronic reconnaissance and the like. In 2018, a broadband circularly polarized radiation antenna based on a super-surface is provided, so that the bandwidth of the antenna is effectively improved, but the antenna can only work in a single frequency band.
In recent years, in artificial structural materials, research and application of super-surfaces become a hot spot, and electromagnetic properties which natural materials do not have can be realized. The super surface is a two-dimensional structural unit array of thin and densely arranged metamaterials, and can control electromagnetic waves. The super-surface unit cells are sub-wavelength in size and arrangement period, and thus have a uniform plane like a uniform polarizer, reflecting and transmitting plane waves, as opposed to the diffraction grating effect which generates multiple diffraction lobes. With the development of the super-surface, which is used for polarization manipulation, the size and thickness of the polarization conversion device can be significantly reduced by the use of the super-surface. When linearly polarized waves radiated by the antenna are incident on the linear circular polarization conversion surface, an incident wave electric field can be decomposed into two orthogonal constant-amplitude polarization components, the phase difference of the two components is 90 degrees by designing the structural unit structure of the super surface, and then the circularly polarized waves can be obtained. The mode of converting the linear circular polarization into the super surface is adopted, the design of a complex feed network is avoided, the section of the whole structure is effectively reduced, the application range is wider, and the control is easier.
In recent years, the demand for dual-band antennas has been increasing in communication systems, and many kinds of dual-band dielectric resonant antennas have been proposed. One common method for designing dual-band dielectric resonant antennas is to use two different dielectric resonators and a coupling slot to achieve circular polarization, but this design method necessarily increases the size of the antenna. Another method is to combine a dielectric resonator antenna and a slot resonator into a dual-band antenna, and directly connect the slot resonator to the feed network of the dielectric resonator antenna, so that it is very difficult to design any two operating frequencies. The design adopts the mode of super surface and metal patch to realize the characteristics of double frequency and circular polarization, the design is flexible and simple, the processing is easy, and the whole section of the antenna can be effectively reduced.
Disclosure of Invention
The present application relates to the design of dielectric resonant antennas, the design of circularly polarized antennas, the design of dual band antennas and the optimization of antennas. The application provides a dual-band dielectric resonant antenna with super-surface circular polarization, which can work in dual-frequency bands and realizes very good circular polarization performance in one working band.
The application aims to provide a dual-band dielectric resonant antenna with super-surface circular polarization, which can realize a dual-band working mode of the dielectric resonant antenna in a high-frequency band and realize a circular polarization radiation mode in one working band.
The technical scheme is as follows:
a dual band dielectric resonant antenna, preferably super-surface circular polarized, comprising: the device comprises a substrate (1), a super surface (2), a rectangular dielectric resonator (3), a circular patch (4) and a coaxial probe (5); wherein the content of the first and second substances,
etching a super surface (2) on a substrate (1), placing a rectangular dielectric resonator (3) on the super surface (2), covering a circular patch (4) right above the rectangular dielectric resonator (3), and feeding power to an antenna through a coaxial probe (5), thereby realizing radiation of the antenna;
a layer of metal is covered below the substrate (1) and used as a reference ground;
the super surface is used for reducing the axial ratio of the antenna and realizing the circular polarization characteristic of the antenna;
the circular patch is positioned in the middle of the rectangular dielectric resonator and is used for realizing the dual-band working characteristic of the antenna;
the coaxial probe is used for feeding the whole antenna;
the super-surface (2) is composed of rectangular metal structural units arranged by 7 multiplied by 7;
the rectangular dielectric resonator (3) is formed by a Rogerstm 10 dielectric with the size of WDR×LDR(20mm 31.75mm), and the electromagnetic wave mode propagated by the rectangular dielectric resonator is TEZ 11δ. Resonance frequency of rectangular dielectric resonator
εrIs the relative dielectric constant, f, of the resonator material0Is a center frequency, WDRBeing the width of the resonator, c is the speed of light in vacuum.
The substrate (1) is a single-layer FR4 substrate with the thickness of 3.2 mm;
the metal rectangle in a unit structure of the super surface and the material of the substrate (1) with the same area below form a self-complementary structure together;the dimensions of the super-surface were 8.76mm by 2.5mm, the transverse spacing of each rectangular cell was 1.835mm, and the longitudinal spacing was 1.835mm 5.125mm(ii) a The transmission (reflection) coefficients of two orthogonal linear polarizations from the complementary super-surface are constantly 90 ° out of phase.
The radiation device has the advantages of wide radiation range, multiple purposes and simple production process.
Drawings
Fig. 1 is a top view of a dual-band dielectric resonator antenna structure with super-surface circular polarization according to embodiment 1 of the present application.
Fig. 2 is a cross-sectional view of a dual-band dielectric resonant antenna structure with super-surface circular polarization according to embodiment 1 of the present application.
Fig. 3 is a graph showing reflection coefficient results of the dual band dielectric resonator antenna with super-surface circular polarization according to embodiment 1 of the present application.
Fig. 4 is a diagram illustrating axial ratio results of the dual-band dielectric resonator antenna with super-surface circular polarization according to embodiment 1 of the present application.
Fig. 5 is a graph illustrating the gain result of the dual band dielectric resonator antenna with super-surface circular polarization according to embodiment 1 of the present application.
Fig. 6 shows that in a unit structure of the super-surface of the embodiment 2, the metal rectangle and the material of the substrate 1 with the same area below form a self-complementary structure together.
FIG. 7 is a graph showing the variation of axial ratio with frequency for different values of the width W of the super-surface unit rectangle in example 2.
FIG. 8 is a graph showing the variation of the S11 parameter with frequency when the length L of the super surface element rectangle of example 2 takes different values.
Detailed Description
The invention is further described in detail with reference to the following specific examples and the accompanying drawings.
Example 1
As shown in fig. 1, the present application provides a dual band dielectric resonant antenna with super-surface circular polarization, comprising: the device comprises a substrate 1, a super surface 2, a rectangular dielectric resonator 3, a circular patch 4 and a coaxial probe 5; wherein the content of the first and second substances,
etching a super surface 2 on a substrate 1, placing a rectangular dielectric resonator 3 on the super surface 2, covering a circular patch 4 right above the rectangular dielectric resonator 3, and feeding power to an antenna through a coaxial probe 5, thereby realizing radiation of the antenna;
the substrate 1 is a single-layer FR4 substrate with the thickness of 3.2mm, and a layer of metal is covered below the substrate and used as a reference ground;
the super-surface 2 is composed of rectangular metal structural units arranged by 7 x 7, is used for reducing the axial ratio of the antenna and is used for realizing the circular polarization characteristic of the antenna;
the rectangular dielectric resonator 3 is formed by a ROGERST TM 10 (Rogers TMM10, available on the market) dielectric with the thickness of 8 mm;
the circular patch 4 is composed of a metal patch with the radius of 3.55mm, is positioned in the middle of the rectangular dielectric resonator 3 and is used for realizing the dual-band working characteristic of the antenna;
the coaxial probe 5 is used to feed the entire antenna.
Fig. 3 is a graph of the variation of the S11 parameter of the antenna with frequency, when the S11 parameter value of the antenna is less than-10 dB, the impedance matching is good, and the antenna can work normally. When the circular patch 4 is not provided, the S11 parameter of the antenna has only one lowest point, namely only one resonance point, and belongs to a single-band antenna; when the circular patch 4 is added, the S11 parameter curve of the antenna has two lowest points, namely two resonance points, and is in a dual-band working state. Thus, the circular patch 4 well realizes the dual-band operation characteristic of the antenna.
Fig. 4 is a graph showing the axial ratio of the antenna as a function of frequency, and when the axial ratio of the antenna is less than 3dBi, the antenna is considered to be in a circular polarization operating state. When the super surface 2 does not exist, the axial ratio values of the antennas are all larger than 3dBi, and the antennas are not in a circular polarization working state; when the super surface 2 is added, the axial ratio of the antenna on the frequency band of 5.60GHz-6.10GHz is lower than 3dBi, and the antenna is in a circular polarization working state. Therefore, the super-surface 2 well reduces the axis ratio of the antenna, and the circular polarization operating characteristic of the antenna is realized. Fig. 5 is a graph showing the variation of the gain of the antenna with frequency, and the maximum gain of the antenna reaches 7.2dBi, thereby realizing a high-gain circularly polarized operating mode. The application realizes the dual-band working mode of 24.7 percent (4.23GHz-5.42GHz) and 8.5 percent (5.60GHz-6.10GHz) and the maximum gain of 7.2 dBi. Can be used for 5GNR (newradio) and WLAN. The super-surface on the substrate effectively reduces the axial ratio of the antenna, realizes circular polarization on a frequency band of 5.60GHz-6.10GHz, and can be used for radar and electronic countermeasure.
Example 2
Example 2 was further optimized on the basis of example 1.
The dielectric substrate 1 is a single-layer FR4 dielectric substrate with low dielectric constant;
the rectangular dielectric resonator 3 is a single-layer ROGERST TM 10 with high dielectric constant and dimension WDR×LDR(20mm 31.75mm), and the electromagnetic wave mode propagated by the rectangular dielectric resonator is TEZ 11δ. Resonance frequency of rectangular dielectric resonator
εrIs the relative dielectric constant, f, of the resonator material0Is a center frequency, WDRBeing the width of the resonator, c is the speed of light in vacuum. When the working frequency is 6.5GHz, the width W of the resonant cavity can be calculatedDRThe size of the rectangular dielectric resonator 3 is finally selected by adding the influence of the structure such as the super surface 2 on the antenna in the simulation software, namely 16.2 mm.
The super-surface 2 is composed of 7 × 7 rectangular metal structural units, and is used for reducing the axial ratio of the antenna and realizing the circular polarization characteristic of the antenna. The reason why the designed super surface can control the electromagnetic wave can be explained by the Huygens principle, each point on the spherical wave surface is a wavelet source of a secondary spherical wave, and the wave speed and the frequency of the wavelet are equal to those of the primary wave. For a finite surface, its electromagnetic field distribution is determined entirely by the electrical and magnetic components that are tangential to the surface. Thus, the external field of the surface can be controlled by controlling the tangential field. The super-surface controls the reflection field and transmission field of the surface by the repetitive arrangement of sub-wavelength unit cells. When linearly polarized waves reflected by a metal ground plane below the substrate 1 are incident on the surface 2, an incident wave electric field can be decomposed into two orthogonal constant-amplitude polarization components, the phase difference of the two orthogonal linear polarization components is 90 degrees through the designed rectangular constitutive unit structure of the super surface, and then circularly polarized waves can be obtained.
In the most preferred embodiment, the super-surface 2 constitutes a self-complementary super-surface, and as shown in fig. 6, the metal rectangles in a unit structure of the super-surface and the material of the substrate 1 with the same area below form a self-complementary structure.The dimension of the super surface is 8.76mm by 2.5mm, each rectangular element having a transverse spacing of 1.835mm and a longitudinal spacing of 5.125mm. The transmission (reflection) coefficients of two orthogonal linear polarizations from the complementary metasurfaces are constantly 90 ° out of phase, so that circular polarization is achieved when their amplitudes are equal. The designed super surface has wide application value in communication equipment and optical devices for polarization regulation and control, and communication systems such as satellites and radars.
As shown in fig. 7, it can be seen that when W is less than 2.5mm, the axial ratio is significantly increased and is higher than 3dBi, and the circular polarization working characteristic cannot be realized; when W is larger than 2.5mm, the ratio of the same axis is obviously increased and is higher than 3dBi, and the working characteristic of circular polarization cannot be realized, so that the width W of the super-surface unit rectangle is 2.5 mm.
As shown in fig. 8, which is a variation curve of the S11 parameter with frequency when the length L of the super surface unit rectangle takes different values, it can be seen that when L is less than 8.76mm, the operating frequency shifts to the right and is not within the circular polarization operating frequency band; when L is greater than 8.76mm, the operating band of S11 less than-10 dBi narrows, so the length L of the super-surface element rectangle is taken to be 8.76 mm.
Claims (1)
1. A dual band dielectric resonant antenna, preferably super-surface circular polarized, comprising: the device comprises a substrate (1), a super surface (2), a rectangular dielectric resonator (3), a circular patch (4) and a coaxial probe (5); wherein the content of the first and second substances,
etching a super surface (2) on a substrate (1), placing a rectangular dielectric resonator (3) on the super surface (2), covering a circular patch (4) right above the rectangular dielectric resonator (3), and feeding power to an antenna through a coaxial probe (5), thereby realizing radiation of the antenna;
a layer of metal is covered below the substrate (1) and used as a reference ground;
the super surface is used for reducing the axial ratio of the antenna and realizing the circular polarization characteristic of the antenna;
the circular patch is positioned in the middle of the rectangular dielectric resonator and is used for realizing the dual-band working characteristic of the antenna;
the coaxial probe is used for feeding the whole antenna;
the super-surface (2) is composed of rectangular metal structural units arranged by 7 multiplied by 7;
the rectangular dielectric resonator (3) is composed of a ROGERS TMM10 dielectric and has the size WDR×LDR(20mm 31.75mm), and the electromagnetic wave mode propagated by the rectangular dielectric resonator is TEZ 11δ. Resonance frequency of rectangular dielectric resonator
εrIs the relative dielectric constant, f, of the resonator material0Is a center frequency, WDRBeing the width of the resonator, c is the speed of light in vacuum.
The substrate (1) is a single-layer FR4 substrate with the thickness of 3.2 mm;
the metal rectangle in a unit structure of the super surface and the material of the substrate (1) with the same area below form a self-complementary structure together;the dimensions of the super-surface were 8.76mm by 2.5mm, the transverse spacing of each rectangular cell was 1.835mm, and the longitudinal spacing was 1.835mm 5.125mm(ii) a The transmission (reflection) coefficients of two orthogonal linear polarizations from the complementary super-surface are constantly 90 ° out of phase.
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| US6700539B2 (en) * | 1999-04-02 | 2004-03-02 | Qualcomm Incorporated | Dielectric-patch resonator antenna |
| US20090184875A1 (en) * | 2008-01-18 | 2009-07-23 | Tze-Hsuan Chang | Dielectric resonator antenna (dra) with a transverse-rectangle well |
| CN201946748U (en) * | 2011-01-15 | 2011-08-24 | 广东通宇通讯股份有限公司 | Single-point feed double-frequency circular polarization hybrid antenna |
| CN110350307A (en) * | 2019-07-12 | 2019-10-18 | 合肥工业大学 | A kind of sequence mutually presents the dielectric resonator antenna array of circular polarisation |
| CN110571527A (en) * | 2019-09-27 | 2019-12-13 | 西安电子科技大学 | Graphene composite super-surface-based electromagnetic wave adjustable polarization converter |
| CN111883912A (en) * | 2020-06-24 | 2020-11-03 | 南京邮电大学 | Ultra-wideband circularly polarized dielectric resonator antenna array |
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2020
- 2020-12-23 CN CN202011534694.9A patent/CN112736438A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6700539B2 (en) * | 1999-04-02 | 2004-03-02 | Qualcomm Incorporated | Dielectric-patch resonator antenna |
| US20090184875A1 (en) * | 2008-01-18 | 2009-07-23 | Tze-Hsuan Chang | Dielectric resonator antenna (dra) with a transverse-rectangle well |
| CN201946748U (en) * | 2011-01-15 | 2011-08-24 | 广东通宇通讯股份有限公司 | Single-point feed double-frequency circular polarization hybrid antenna |
| CN110350307A (en) * | 2019-07-12 | 2019-10-18 | 合肥工业大学 | A kind of sequence mutually presents the dielectric resonator antenna array of circular polarisation |
| CN110571527A (en) * | 2019-09-27 | 2019-12-13 | 西安电子科技大学 | Graphene composite super-surface-based electromagnetic wave adjustable polarization converter |
| CN111883912A (en) * | 2020-06-24 | 2020-11-03 | 南京邮电大学 | Ultra-wideband circularly polarized dielectric resonator antenna array |
Non-Patent Citations (1)
| Title |
|---|
| G. ZHAO, J. R. WANG, X. SHI AND M. S. TONG: "A Dualband Dielectric Resonator Antenna over a Metasurface with Circular Polarization", 《2020 IEEE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION AND NORTH AMERICAN RADIO SCIENCE MEETING》 * |
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