CN112821066A - Improve EBG structure of antenna isolation - Google Patents
Improve EBG structure of antenna isolation Download PDFInfo
- Publication number
- CN112821066A CN112821066A CN202011609549.2A CN202011609549A CN112821066A CN 112821066 A CN112821066 A CN 112821066A CN 202011609549 A CN202011609549 A CN 202011609549A CN 112821066 A CN112821066 A CN 112821066A
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- China
- Prior art keywords
- ebg structure
- metal patch
- isolation
- patch units
- medium substrate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
- H01Q1/523—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas between antennas of an array
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
- H01Q1/525—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas between emitting and receiving antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
- H01Q21/065—Patch antenna array
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- Variable-Direction Aerials And Aerial Arrays (AREA)
- Waveguide Aerials (AREA)
Abstract
The invention discloses an EBG structure for improving the isolation degree of an antenna, which comprises: an EBG structure; the EBG structure is arranged between the microstrip antennas; the EBG structure comprises a high-frequency dielectric substrate, a ground plate and a plurality of metal patch units, wherein the high-frequency dielectric substrate is arranged on the ground plate, the metal patch units are arranged on the high-frequency dielectric substrate in a matrix manner, and a through hole penetrating through the metal patch units and the high-frequency dielectric substrate is arranged in the middle of each metal patch unit.
Description
Technical Field
The invention belongs to the technical field of antennas, and particularly relates to an EBG structure for improving antenna isolation.
Background
In the millimeter wave continuous wave radar system, the antenna working mode belongs to a system with the same frequency for receiving and transmitting, and the influence of the isolation between the receiving and transmitting antennas on the working performance of the system cannot be ignored. In millimeter wave band, microstrip antenna is widely used in miniaturized radar because of its small profile and easy to realize integrated processing. The microstrip antenna design can also provide convenience for designing the array antenna under the condition of ensuring the size, and further the antenna performance is improved. However, due to the miniaturization of the system, the distance between the transmitting and receiving antennas is small, and the mutual coupling between the antennas is serious, so that the isolation of the transmitting and receiving antennas is reduced, and the detection sensitivity of the system is influenced.
Disclosure of Invention
The invention aims to provide an EBG structure for improving antenna isolation, which can improve the isolation between antennas.
In order to achieve the purpose, the invention provides the following technical scheme:
an EBG structure for improving antenna isolation, comprising: an EBG structure; the EBG structure is arranged between the microstrip antennas; the EBG structure comprises a high-frequency medium substrate, a grounding plate and a plurality of metal patch units, wherein the high-frequency medium substrate is arranged on the grounding plate, the metal patch units are arranged on the high-frequency medium substrate, and a through hole penetrating through the metal patch units and the high-frequency medium substrate is formed in the middle of each metal patch unit.
Further, the material model of the high-frequency dielectric substrate is RO 4350.
Furthermore, the metal patch units are arranged on the high-frequency dielectric substrate in a matrix manner. Furthermore, the metal patch units are arranged on the high-frequency medium substrate in 3 rows and 11 columns.
Furthermore, the cross section of the metal welting unit is square.
Furthermore, the side length of the metal welt single is 2.57-2.63 mm.
Furthermore, the distance between two adjacent metal patch units is 0.18-0.22 mm.
The beneficial technical effects are as follows: according to the invention, the EBG structure is arranged between the antennas, so that the isolation of the antennas is increased, and the detection sensitivity of the system is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a top view of an EBG structure in accordance with the present invention;
fig. 3 is a comparison graph of S11 parameter curves between the microstrip antenna array after loading the 11 × 3 periodic planar EBG structure in simulation and the microstrip antenna array without loading the periodic planar EBG structure in the present invention;
fig. 4 is a comparison of S21 parameter curves between the microstrip antenna array with the 11 × 3 periodic planar EBG structure loaded in simulation and the microstrip antenna array without the periodic planar EBG structure loaded in simulation according to the present invention;
fig. 5 is a comparison graph of radiation pattern parameter curves between a microstrip antenna array with a simulated 11 × 3 periodic planar EBG structure loaded and a microstrip antenna array without a periodic planar EBG structure loaded in the present invention;
fig. 6 is a cross-sectional view of an EBG structure in the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 6, an EBG structure for improving antenna isolation includes: an EBG structure 2; the EBG structure is arranged in the middle between the two microstrip antennas 1; the EBG structure 2 comprises a high-frequency dielectric substrate 21, a grounding plate 22 and a plurality of metal patch units 23, wherein the high-frequency dielectric substrate 21 is arranged on the grounding plate 22, and the metal patch units 23 are arranged on the high-frequency dielectric substrate 21 in 3 rows and 11 columns. The middle of each metal patch unit 23 is provided with a through hole 24 penetrating through the metal patch unit 23 and the high-frequency medium substrate 21, the cross section of each metal patch unit is square, the side length is 2.57-2.63 mm, and the distance between every two adjacent metal patch units is 0.18-0.22 mm.
The high-frequency dielectric substrate 21 is made of RO4350, the loss tangent is 0.004, and the thickness of a PCB serving as the substrate is 0.254 mm.
The microstrip antenna array is a four-unit 2 x 2 array antenna, and the size length and the width of each patch antenna unit are 4.07mm and 3.1mm respectively.
After the periodic plane EBG structure is added between the antenna arrays, the isolation between the microstrip antenna arrays is improved by the novel periodic EBG structure in a frequency band of 24GHz-24.25GHz due to the stop band effect of the EBG structure. Compared with the traditional layout mode of the microstrip antenna array, after the periodic plane EBG structure is added, the isolation of the antenna is improved, the gain of the antenna is hardly reduced, and the directivity of the antenna is hardly changed. The addition of the periodic plane EBG structure effectively improves the isolation between the transmitting and receiving antennas of the system without influencing the performance of the system. Through comparing the performances of the periodic plane EBG structures of the 11 × 1 periodic units, the 11 × 2 periodic units and the 11 × 3 periodic units, it can be seen that the isolation of the antenna is obviously improved after the 11 × 3 periodic plane EBG structure is loaded, and the isolation can be improved by more than 10dB at the central frequency point of 24.1 GHz.
The EBG structure adopted by the invention has moderate size, is easy to process in a K wave band, and can be applied to a communication system of a 24GHz frequency band.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. An EBG structure for improving antenna isolation, comprising: an EBG structure; the EBG structure is arranged between the microstrip antennas; the EBG structure comprises a high-frequency medium substrate, a grounding plate and a plurality of metal patch units, wherein the high-frequency medium substrate is arranged on the grounding plate, the metal patch units are arranged on the high-frequency medium substrate, and a through hole penetrating through the metal patch units and the high-frequency medium substrate is formed in the middle of each metal patch unit.
2. The EBG structure-based high-isolation antenna according to claim 1, characterized in that: the material model of the high-frequency dielectric substrate is RO 4350.
3. The EBG structure-based high-isolation antenna according to claim 1, characterized in that: the metal patch units are arranged on the high-frequency medium substrate in a matrix manner.
4. The EBG structure-based high-isolation antenna according to claim 3, characterized in that: the metal patch units are arranged on the high-frequency medium substrate in 3 rows and 11 columns.
5. The EBG structure-based high-isolation antenna of claim 1, wherein the metal welt cells are square in cross-section.
6. The EBG structure-based high-isolation antenna according to claim 4, wherein the side length of the metal welt is between 2.57 mm and 2.63 mm.
7. The EBG structure-based high-isolation antenna according to claim 1, characterized in that: the distance between two adjacent metal patch units is 0.18-0.22 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011609549.2A CN112821066A (en) | 2020-12-30 | 2020-12-30 | Improve EBG structure of antenna isolation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011609549.2A CN112821066A (en) | 2020-12-30 | 2020-12-30 | Improve EBG structure of antenna isolation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112821066A true CN112821066A (en) | 2021-05-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011609549.2A Pending CN112821066A (en) | 2020-12-30 | 2020-12-30 | Improve EBG structure of antenna isolation |
Country Status (1)
| Country | Link |
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| CN (1) | CN112821066A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102176537A (en) * | 2011-01-17 | 2011-09-07 | 西安电子科技大学 | Antenna for reducing radar scattering cross section |
| CN108631060A (en) * | 2017-03-24 | 2018-10-09 | 松下电器产业株式会社 | Antenna assembly |
-
2020
- 2020-12-30 CN CN202011609549.2A patent/CN112821066A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102176537A (en) * | 2011-01-17 | 2011-09-07 | 西安电子科技大学 | Antenna for reducing radar scattering cross section |
| CN108631060A (en) * | 2017-03-24 | 2018-10-09 | 松下电器产业株式会社 | Antenna assembly |
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