CN116581546A - Low-profile dual-frequency Fabry-Perot resonant cavity antenna - Google Patents

Low-profile dual-frequency Fabry-Perot resonant cavity antenna Download PDF

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Publication number
CN116581546A
CN116581546A CN202310854142.3A CN202310854142A CN116581546A CN 116581546 A CN116581546 A CN 116581546A CN 202310854142 A CN202310854142 A CN 202310854142A CN 116581546 A CN116581546 A CN 116581546A
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metal patch
patch
metal
dielectric substrate
layer
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刘宇峰
徐磊
朱乐乐
张文梅
高扬
仝宗伟
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Shanxi University
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Shanxi University
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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/002—Protection against seismic waves, thermal radiation or other disturbances, e.g. nuclear explosion; Arrangements for improving the power handling capability of an antenna
    • 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
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/48—Earthing means; Earth screens; Counterpoises
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
    • H01Q13/10—Resonant slot antennas
    • H01Q13/18—Resonant slot antennas the slot being backed by, or formed in boundary wall of, a resonant cavity ; Open cavity antennas
    • 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
    • H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • 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
    • H01Q5/10—Resonant antennas
    • 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
    • H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
    • 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
    • H01Q9/045—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular feeding means
    • 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
    • H01Q9/0485—Dielectric resonator antennas
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Waveguide Aerials (AREA)

Abstract

The invention belongs to the technical field of manufacturing of structural parts and electrical element assemblies of electrical equipment, and relates to a low-profile dual-frequency Fabry-Perot resonant cavity antenna, which solves the problems in the background art and comprises a partial reflecting layer and a grounding plate layer; the partial reflecting layer comprises a top layer dielectric substrate, an upper reflecting structure and a lower reflecting structure, and the upper reflecting structure and the lower reflecting structure are respectively etched on the upper surface and the lower surface of the top layer dielectric substrate; the grounding plate layer comprises a bottom dielectric substrate and an artificial magnetic conductor surface, wherein the artificial magnetic conductor surface is etched on the upper surface of the bottom dielectric substrate, a rectangular microstrip patch is etched in the center of the upper surface of the bottom dielectric substrate, two strip-shaped gaps are formed in the rectangular microstrip patch to form a double-frequency radiation patch, and a metal grounding surface is etched on the lower surface of the bottom dielectric substrate. The artificial magnetic conductor surface reduces the height of the section of the antenna, and the partial reflection layer enhances the gain of the dual-frequency radiation patch, thus laying a foundation for improving the gain of the antenna and the return loss.

Description

Low-profile dual-frequency Fabry-Perot resonant cavity antenna
Technical Field
The invention belongs to the technical field of manufacturing of structural parts and electrical element assemblies of electrical equipment, relates to an antenna, and particularly relates to a low-profile dual-frequency Fabry-Perot resonant cavity antenna.
Background
Antennas are an important component of wireless communication systems as devices for transmitting and receiving signals in wireless communications. With the rapid development of wireless communication technology, the performance requirements for antennas are also increasing.
Fabry-Perot resonator (Fabry-Perot resonator) antennas are gaining increasing attention and application in modern wireless communications due to their simple feed structure and high gain characteristics. The Fabry-Perot resonant cavity antenna mainly comprises three parts, namely a feed source structure, a metal grounding plate and a partial reflecting layer (PRS). Electromagnetic waves radiated by the feed source are incident into the partial reflecting layer, energy is reflected back and forth between the two plates for multiple times, when the space between the two plate cavities reaches a resonance condition, electromagnetic waves transmitted at each position in the partial reflecting layer can be overlapped in phase on the aperture surface, and the effects of improving the gain radiation of the antenna and sharpening the beam width are achieved.
On the premise of ensuring the high-gain radiation characteristic of the Fabry-Perot resonant cavity antenna, the section height of the cavity is effectively reduced, and the working frequency band is increased on the basis, so that the antenna becomes one of important directions in the field of antenna research. Currently, the low profile characteristics of Fabry-Perot cavity antennas are achieved by varying the reflection phase of the partially reflective layer and the ground plane. Such as: the section of the antenna is reduced to 0.19 lambda by loading the artificial magnetic conductor surface and the electromagnetic band gap structure in the paper of Low-profile high-gain slot antenna with Fabry-pe rot cavity and mushroom-like electromagnetic band gap structures by YIng Liu et al, but the resonant cavity structure and the feed source structure of the designed antenna are complex and have lower gain. Al-Tarifi M5 Anagnostou D et Al in the paper "Two-cavity model for creating Two high-directivity bands of the resonant cavity antenna with flexible and dynamic control" adopts a double-layer dielectric plate as a partial reflecting layer, and forms Two resonant cavity structures with a grounding plate, so that Two-frequency resonance conditions are achieved, and the antenna section is high although the dual-frequency performance is realized, so that the antenna is not beneficial to application. The Kuigen Cao et al in the paper "Low-Profile Dual-band Fabry-Perot Resonator Antenna" adopts a patch antenna with a single feed point offset as a feed source, and loads a super surface on a part of a reflecting layer and a grounding plate. Therefore, it is of great importance to study a low-profile dual-frequency Fabry-Perot resonant cavity antenna that solves the above-mentioned problems.
Disclosure of Invention
In order to solve the technical problem of how to effectively reduce the section height of the cavity of the resonant cavity and increase the working frequency band on the basis of the section height on the premise of ensuring the high-gain radiation characteristic, the invention provides a low-section double-frequency Fabry-Perot resonant cavity antenna loaded with the surface of an artificial magnetic conductor.
The invention discloses a low-profile dual-frequency Fabry-Perot resonant cavity antenna, which comprises a partial reflecting layer and a grounding plate layer; the partial reflecting layer comprises a top layer dielectric substrate, an upper reflecting structure and a lower reflecting structure, wherein the upper reflecting structure and the lower reflecting structure are respectively etched on the upper surface and the lower surface of the top layer dielectric substrate, the upper reflecting structure comprises first metal patches and second metal patches which are distributed in a rectangular array, and each four first metal patches surround one second metal patch and are adjacent to each other; the first metal patch is a diamond ring, the second metal patch consists of a ring and a circular sheet which are concentrically arranged, the circular sheet is positioned in the middle of the ring, and a space is arranged between the circular sheet and the circular sheet; the lower reflection structure comprises third metal patches and fourth metal patches which are distributed in a rectangular array, and each four third metal patches surround one fourth metal patch and are spaced; the third metal patch is a diamond-shaped sheet, and the fourth metal patch is a circular ring; the grounding plate layer comprises a bottom layer medium substrate and an artificial magnetic conductor surface, wherein the artificial magnetic conductor surface is etched on the upper surface of the bottom layer medium substrate, the artificial magnetic conductor surface comprises a fifth metal patch and a sixth metal patch which are distributed in a rectangular array, each fourth metal patch surrounds one sixth metal patch and is spaced, the fifth metal patch is a cross-shaped piece, the sixth metal patch is a round piece, the center of the upper surface of the bottom layer medium substrate is also etched with a rectangular microstrip patch, two parallel strip-shaped slits are formed in the rectangular microstrip patch to form a double-frequency radiation patch, a feed point is arranged between the two strip-shaped slits, an SMA connector connected with the feed point is fixedly arranged in the bottom layer medium substrate in a penetrating manner, and a metal grounding surface is etched on the lower surface of the bottom layer medium substrate; the part of the reflecting layer is positioned above the grounding plate layer, the part of the reflecting layer is connected with the grounding plate layer through nylon studs, and a space serving as a resonant cavity is arranged between the part of the reflecting layer and the grounding plate layer.
And a resonant cavity is formed between the partial reflecting layer and the grounding plate layer, and the nylon studs are used as connecting pieces, so that the air height of the resonant cavity can be kept between the top dielectric substrate and the bottom dielectric substrate. In the partial reflecting layer, the first metal patch is a diamond ring, the second metal patch consists of a ring and a circular sheet which are concentrically arranged, the third metal patch is a diamond sheet, and the fourth metal patch is a ring, wherein the reflecting characteristics of the partial reflecting layer can be adjusted in a larger range by the partial reflecting surface formed by the special arrangement mode. The surface of the artificial magnetic conductor is provided with the fifth metal patch and the sixth metal patch which are periodically arranged, so that surface waves can be restrained, and in-phase reflection characteristics can be realized. And feeding the double-frequency radiation patch by adopting an SMA connector to provide excitation for the resonant cavity.
Preferably, the first metal patch, the third metal patch and the fifth metal patch are vertically positioned correspondingly, and the second metal patch, the fourth metal patch and the sixth metal patch are vertically positioned correspondingly. Therefore, the reflection phases of the partial reflection layer and the grounding plate layer correspond to each other, the transmitted electromagnetic waves are overlapped in phase, and the gain of the antenna is improved.
Preferably, through holes for penetrating and fixing nylon studs are formed in four corners of the partial reflecting layer and the grounding plate layer. The arrangement structure is reasonable.
Preferably, the dielectric constant of the top dielectric substrate is 2.55 and the thickness is 2mmThe relative dielectric constant of the bottom dielectric substrate is 2.2 and the thickness is 2mm. This reduces costs and facilitates processing.
Preferably, two parallel strip-shaped gaps are arranged on the rectangular microstrip patch, and 12GHz resonance points are added on the basis of the original 7GHz resonance points, so that the double-frequency radiation patch is formed.
Preferably, the long side of the rectangular microstrip patchS 1 11.8mmShort sidey 1 11.3mmLong sides of two strip gaps on rectangular microstrip patchsl9.2mmShort sideswIs 0.55mmDistance from feed point to lower edge of rectangular microstrip patchy f Is 0.85mmDistance from lower strip gap to lower edge of rectangular microstrip patchsh4.8mm. The arrangement structure is reasonable.
Preferably, the first metal patch, the second metal patch, the third metal patch, the fourth metal patch, the fifth metal patch and the sixth metal patch are all copper patches and have the same thickness of 0.035mmThe length and width of the metal grounding surface are consistent with those of the bottom dielectric substrate, and the metal grounding surface is made of copper and has a thickness of 0.035mm. The arrangement structure is reasonable.Compared with the prior art, the technical scheme provided by the invention has the following advantages: according to the resonant cavity antenna, two symmetrical strip-shaped gaps are etched on the rectangular microstrip patch antenna, so that the dual-frequency performance of the Fabry-Perot resonant cavity antenna is realized, each frequency band independently realizes the function, and the defect of mutual influence between the frequency bands in the prior art is avoided.
According to the resonant cavity antenna, the first metal patch, the second metal patch, the third metal patch and the fourth metal patch are respectively loaded on the upper surface and the lower surface of the top dielectric substrate, so that double-frequency response is generated, double-layer partial reflection layers are prevented from being adopted to generate double-frequency response in the prior art, the overall volume of the Fabry-Perot resonant cavity antenna is reduced, and miniaturization of the antenna is facilitated; the artificial magnetic conductor surface formed by the fifth metal patch and the sixth metal patch which are periodically arranged is printed on the bottom dielectric substrate, the section height of the Fabry-Perot resonant cavity antenna is reduced by the artificial magnetic conductor surface, the gain based on the dual-frequency radiation patch is enhanced, and a foundation is laid for improving the gain and the return loss of the Fabry-Perot resonant cavity antenna.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic three-dimensional structure of a low-profile dual-frequency Fabry-Perot cavity antenna according to the present invention;
FIG. 2 is a longitudinal cross-sectional view of a low profile dual frequency Fabry-Perot cavity antenna according to the present invention;
FIG. 3 is a schematic view of the upper surface structure of the partially reflective layer;
FIG. 4 is a schematic view of the bottom surface structure of the partially reflective layer;
FIG. 5 is a schematic view of the upper surface structure of the grounding plate layer;
fig. 6 is a schematic size diagram of the rectangular microstrip patch;
FIG. 7 is a schematic view of the dimensions of the first metal patch;
FIG. 8 is a schematic size view of the second metal patch;
FIG. 9 is a schematic size view of the third metal patch;
FIG. 10 is a schematic size diagram of the fourth metal patch;
FIG. 11 is a schematic illustration of the dimensions of the fifth metal patch;
FIG. 12 is a schematic size view of the sixth metal patch;
FIG. 13 is a graph of the simulated S11 curve of a Fabry-Perot cavity antenna according to an embodiment of the present invention;
FIG. 14 is a normalized radiation E-plane pattern at 7GHz for a Fabry-Perot cavity antenna in accordance with an embodiment of the present invention;
FIG. 15 is a normalized radiation H-plane pattern at 7GHz for a Fabry-Perot cavity antenna in accordance with an embodiment of the present invention;
FIG. 16 is a normalized radiation E-plane pattern at 12GHz for a Fabry-Perot cavity antenna in accordance with an embodiment of the present invention;
FIG. 17 is a normalized radiation H-plane pattern at 12GHz for a Fabry-Perot resonant cavity antenna in accordance with the specific present embodiment of the invention;
fig. 18 is a graph of gain of a Fabry-Perot cavity antenna according to an embodiment of the invention.
In the figure: 1. a partially reflective layer; 2. a ground plate layer; 3. a top dielectric substrate; 4. an upper reflective structure; 5. a lower reflective structure; 6. a first metal patch; 7. a second metal patch; 8. a third metal patch; 9. a fourth metal patch; 10. a bottom dielectric substrate; 11. an artificial magnetic conductor surface; 12. a fifth metal patch; 13. a sixth metal patch; 14. rectangular microstrip patches; 15. a strip-shaped slit; 16. a feeding point; 17. an SMA joint; 18. a metal ground plane; 20. a resonant cavity; 21. and a through hole.
Detailed Description
In order that the above objects, features and advantages of the invention will be more clearly understood, a further description of the invention will be made. It should be noted that, without conflict, the embodiments of the present invention and features in the embodiments may be combined with each other.
In the description, it should be noted that the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. It should be noted that, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms described above will be understood by those of ordinary skill in the art as the case may be.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced otherwise than as described herein; it will be apparent that the embodiments in the specification are only some, but not all, embodiments of the invention.
Specific embodiments of the present invention will be described in detail below with reference to fig. 1 to 18.
In one embodiment, as shown in fig. 1 to 12, a low-profile dual-frequency Fabry-Perot resonant cavity antenna loaded with an artificial magnetic conductor surface is disclosed, comprising a partially reflective layer 1 and a ground plate layer 2; the partial reflecting layer 1 comprises a top dielectric substrate 3, an upper reflecting structure 4 and a lower reflecting structure 5, wherein the upper reflecting structure 4 and the lower reflecting structure 5 are respectively etched on the upper surface and the lower surface of the top dielectric substrate 3, the upper reflecting structure 4 comprises a first metal patch 6 and a second metal patch 7 which are distributed in a rectangular array, and each four first metal patches 6 surround one second metal patch 7 and are adjacent to each other; the first metal patch 6 is a diamond ring, the second metal patch 7 consists of a concentric ring and a circular sheet, and the circular sheet is positioned in the middle of the ringA space is arranged between the two; the lower reflecting structure 5 comprises third metal patches 8 and fourth metal patches 9 which are distributed in a rectangular array, and each four third metal patches 8 surrounds one fourth metal patch 9 and is spaced apart; the third metal patch 8 is a diamond-shaped sheet, and the fourth metal patch 9 is a circular ring; the grounding plate layer 2 comprises a bottom dielectric substrate 10 and an artificial magnetic conductor surface 11, the artificial magnetic conductor surface 11 is etched on the upper surface of the bottom dielectric substrate 10, the artificial magnetic conductor surface 11 comprises a fifth metal patch 12 and a sixth metal patch 13 which are distributed in a rectangular array, each fourth metal patch 12 surrounds one sixth metal patch 13 and is spaced, the fifth metal patch 12 is a cross-shaped sheet, the sixth metal patch 13 is a round sheet, the center of the upper surface of the bottom dielectric substrate 10 is also etched with a rectangular microstrip patch 14, two parallel strip gaps 15 of two parallel strip gaps 15 are arranged on the rectangular microstrip patch 14 and are symmetrical with respect to the central line of the rectangular microstrip patch 14, a 12GHz resonance point is added on the basis of the original 7GHz resonance point, a dual-frequency radiation patch is formed, excitation is provided for the resonance cavity 20, and the Fabry-Perot resonance cavity 20 antenna generates dual-frequency performance; a feeding point 16 is arranged between the two strip-shaped gaps 15, an SMA joint 17 connected with the feeding point 16 is fixedly arranged in the bottom layer dielectric substrate 10 in a penetrating way, a metal grounding surface 18 is etched on the lower surface of the bottom layer dielectric substrate 10, and the long side of the rectangular microstrip patch 14S 1 11.8mmShort sidey 1 11.3mmLong sides of two strip-shaped gaps 15 on rectangular microstrip patch 14sl9.2mmShort sideswIs 0.55mmDistance from the feeding point 16 to the lower side of the rectangular microstrip patch 14y f Is 0.85mmDistance from the lower strip slit 15 to the lower side of the rectangular microstrip patch 14sh4.8mmThe method comprises the steps of carrying out a first treatment on the surface of the The top dielectric substrate 3 is composed of F4B255, and has a relative dielectric constant of 2.55 and a thickness of 2mmThe underlying dielectric substrate 10 is composed of F4B220 with a relative dielectric constant of 2.2 and a thickness of 2mmThe method comprises the steps of carrying out a first treatment on the surface of the The partial reflecting layer 1 is arranged above the grounding plate layer 2, the upper and lower positions of the first metal patch 6, the third metal patch 8 and the fifth metal patch 12 correspond to the upper and lower positions of the second metal patch 7, the fourth metal patch 9 and the sixth metal patch 13Corresponding to the above; the part of the reflecting layer 1 is connected with the grounding plate layer 2 through nylon studs, through holes 21 for penetrating and fixing the nylon studs are formed in four corners of the part of the reflecting layer 1 and the grounding plate layer 2, and a space serving as a resonant cavity 20 is formed between the part of the reflecting layer 1 and the grounding plate layer 2. The first metal patch 6, the second metal patch 7, the third metal patch 8, the fourth metal patch 9, the fifth metal patch 12 and the sixth metal patch 13 are copper patches and have the same thickness of 0.035mmThe length and width of the metal grounding surface 18 are consistent with those of the bottom dielectric substrate 10, and the metal grounding surface 18 is made of copper and has a thickness of 0.035mm. The arrangement structure is reasonable. The diamond ring serving as the first metal patch 6 is a square ring body, the diamond sheet serving as the third metal patch 8 is a square sheet, and the outer ring side length of the diamond ring is equal to the side length of the diamond sheet; the diameter of the circular piece in the second metal patch 7 is equal to the inner diameter of the circular ring of the fourth metal patch 9, and the inner diameter of the circular ring in the second metal patch 7 is equal to the outer diameter of the circular ring of the fourth metal patch 9; the length and width of the two strips of the fifth metal patch 12 are equal. In a specific embodiment, the inner ring side length of the diamond ringa 1 4.24mmOuter ring side length of diamond ringa 2 7.07 (7.07)mmThe method comprises the steps of carrying out a first treatment on the surface of the Diameter of circular piece of second metal patch 7r 1 Is 2.67mmThe inner diameter of the ring of the second metal patch 7r 2 4.60mmOuter diameter ofr 3 4.95 ofmmThe method comprises the steps of carrying out a first treatment on the surface of the Side length of diamond-shaped sheeta 2 7.07 (7.07)mmThe method comprises the steps of carrying out a first treatment on the surface of the The inner diameter r of the ring of the fourth metal patch 9 1 Is 2.67mmOuter diameter ofr 2 4.60mmThe method comprises the steps of carrying out a first treatment on the surface of the The cross-shaped sheet as the fifth metal patch 12 is formed by overlapping and intersecting two equal length strip-shaped sheets, the length of the strip-shaped sheetsl9.40mmWidth of stripwIs 0.5mmDiameter of circular piece as sixth metal patch 13r 4 4.20 ofmm。
A resonant cavity 20 is formed between the partial reflecting layer 1 and the grounding plate layer 2, and nylon studs are used as connecting pieces, so that the air height of the resonant cavity 20 can be kept between the top dielectric substrate 3 and the bottom dielectric substrate 10. In the partial reflecting layer 1, the first metal patch 6 is a diamond ring, the second metal patch 7 is composed of a concentric ring and a circular sheet, the third metal patch 8 is a diamond sheet, and the fourth metal patch 9 is a ring, wherein the reflecting characteristics of the partial reflecting layer 1 can be adjusted in a larger range by the partial reflecting surface formed by the special arrangement mode. The fifth metal patch 12 and the sixth metal patch 13 which are periodically arranged are arranged on the surface 11 of the artificial magnetic conductor, so that surface waves can be suppressed, and in-phase reflection characteristics can be realized. The dual frequency radiating patch is fed with SMA joint 17 to provide excitation for the resonant cavity 20.
In a specific embodiment, the above embodiment was simulated using a CST microwave working chamber. The reflection phases of the partially reflecting surfaces of the present invention at 7GHz and 12GHz are-90 ° and-122 °, respectively, and the reflection phases of the artificial magnetic conductor surface 11 at 7GHz and 12GHz are 120 ° and 163 °, respectively. Fig. 13 is an |s11| curve simulated by the Fabry-Perot resonator antenna in this embodiment, and as can be seen from fig. 13, the frequency points of operation of the Fabry-Perot resonator 20 antenna are 7GHz and 12GHz, and the Fabry-Perot resonator 20 antenna achieves dual-frequency characteristics. In the design of the traditional Fabry-Perot resonant cavity antenna, the resonant cavity height is generally half of the spatial wavelength, and the designed Fabry-Perot resonant cavity antenna has the resonant cavity 20 height of 0.035 respectively due to the addition of the artificial magnetic conductor surfaceλ 0 (7GHz)、0.06λ 1 (12 GHz), whereλ 0 、λ 1 The spatial wavelengths at 7GHz and 12GHz respectively show that the low-profile dual-frequency Fabry-Perot resonant cavity antenna loading the artificial magnetic conductor surface 11 greatly reduces the profile height of the Fabry-Perot resonant cavity antenna.
Fig. 14 and 15 are normalized radiation patterns of the Fabry-Perot resonator 20 antenna at 7GHz in this embodiment, fig. 14 is an E-plane pattern, and fig. 15 is an H-plane pattern, indicating that the gain reaches 13.59 dBi. Fig. 16 and 17 are normalized radiation patterns of the antenna at 12GHz in this embodiment, fig. 16 is an E-plane pattern, fig. 17 is an H-plane pattern, and the gain is 14.07 dBi, which indicates that the low-profile dual-frequency Fabry-Perot resonant cavity 20 antenna loaded with the artificial magnetic conductor surface 11 of the present invention has good radiation performance, and the gain curves of the antenna are as shown in fig. 18, where the maximum gains of the antenna at two frequency bands are 14.1 dBi and 16.52 dBi, respectively, so as to realize the high gain characteristic of the Fabry-Perot resonant cavity 20 antenna.
The foregoing is only a specific embodiment of the invention to enable those skilled in the art to understand or practice the invention. Although described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the embodiments, and they should be construed as covering the scope of the appended claims.

Claims (8)

1. The low-profile dual-frequency Fabry-Perot resonant cavity antenna is characterized by comprising a partial reflecting layer (1) and a grounding plate layer (2);
the partial reflecting layer (1) comprises a top dielectric substrate (3), an upper reflecting structure (4) and a lower reflecting structure (5), wherein the upper reflecting structure (4) and the lower reflecting structure (5) are respectively etched on the upper surface and the lower surface of the top dielectric substrate (3), the upper reflecting structure (4) comprises first metal patches (6) and second metal patches (7) which are distributed in a rectangular array, and every four first metal patches (6) surround one second metal patch (7) and are adjacent to each other; the first metal patch (6) is a diamond ring, the second metal patch (7) consists of a concentric ring and a circular sheet, the circular sheet is positioned in the middle of the ring, and a space is arranged between the circular sheet and the circular sheet; the lower reflecting structure (5) comprises third metal patches (8) and fourth metal patches (9) which are distributed in a rectangular array, and each four third metal patches (8) surrounds one fourth metal patch (9) and is spaced; the third metal patch (8) is a diamond-shaped sheet, and the fourth metal patch (9) is a circular ring;
the grounding plate layer (2) comprises a bottom dielectric substrate (10) and an artificial magnetic conductor surface (11), the artificial magnetic conductor surface (11) is etched on the upper surface of the bottom dielectric substrate (10), the artificial magnetic conductor surface (11) comprises a fifth metal patch (12) and a sixth metal patch (13) which are distributed in a rectangular array, each fourth metal patch (12) surrounds one sixth metal patch (13) and is spaced, the fifth metal patch (12) is a cross-shaped sheet, the sixth metal patch (13) is a circular sheet, the center of the upper surface of the bottom dielectric substrate (10) is also etched with a rectangular microstrip patch (14), two parallel strip-shaped slits (15) are formed in the rectangular microstrip patch (14) to form a double-frequency radiation patch, a feeding point (16) is arranged between the two strip-shaped slits (15), an SMA joint (17) connected with the feeding point (16) is fixedly arranged in the bottom dielectric substrate (10) in a penetrating mode, and a metal grounding surface (18) is etched on the lower surface of the bottom dielectric substrate (10);
the part reflection layer (1) is positioned above the grounding plate layer (2), the part reflection layer (1) is connected with the grounding plate layer (2) through nylon studs, and a space serving as a resonant cavity (20) is arranged between the part reflection layer (1) and the grounding plate layer (2).
2. A low profile dual frequency Fabry-Perot resonator antenna according to claim 1, characterised in that the first metal patch (6), the third metal patch (8) and the fifth metal patch (12) are located in a vertically corresponding position, and the second metal patch (7), the fourth metal patch (9) and the sixth metal patch (13) are located in a vertically corresponding position.
3. A low profile dual frequency Fabry-Perot resonator antenna according to claim 2, characterized in that through holes (21) for passing through the fixing nylon studs are provided at the four corners of the partially reflective layer (1) and the ground plate layer (2).
4. A low profile dual frequency Fabry-Perot resonator (20) antenna according to any of claims 1 to 3, characterised in that the top dielectric substrate (3) has a relative permittivity of 2.55 and a thickness of 2mmThe relative dielectric constant of the underlying dielectric substrate (10) is 2.2 and the thickness is 2mm。
5. The low-profile dual-frequency Fabry-Perot resonant cavity antenna of claim 4, wherein two parallel strip-shaped slits (15) are arranged on the rectangular microstrip patch (14) to form a dual-frequency radiation patch by adding 12GHz resonance point to the original 7GHz resonance point.
6. A low profile dual frequency Fabry-Perot cavity antenna according to claim 5, characterised by a long side of rectangular microstrip patch (14)S 1 11.8mmShort sidey 1 11.3mmLong sides of two strip-shaped gaps (15) on the rectangular microstrip patch (14)sl9.2mmShort sideswIs 0.55mmDistance from the feeding point (16) to the lower side of the rectangular microstrip patch (14)y f Is 0.85mmDistance from the lower strip gap (15) to the lower edge of the rectangular microstrip patch (14)sh4.8mm。
7. The low-profile dual-frequency Fabry-Perot resonator antenna of claim 6, wherein the first metal patch (6), the second metal patch (7), the third metal patch (8), the fourth metal patch (9), the fifth metal patch (12) and the sixth metal patch (13) are copper patches and have equal thicknesses of 0.035mmThe length and width of the metal grounding surface (18) are consistent with those of the bottom dielectric substrate (10), and the metal grounding surface (18) is made of copper and has a thickness of 0.035mm。
8. The low-profile dual-frequency Fabry-Perot resonator antenna of claim 7, wherein the diamond ring as the first metal patch (6) is a square ring body, the diamond plate as the third metal patch (8) is a square plate, and the outer ring side length of the diamond ring is equal to the side length of the diamond plate; the diameter of the circular piece in the second metal patch (7) is equal to the inner diameter of the circular ring of the fourth metal patch (9), and the inner diameter of the circular ring in the second metal patch (7) is equal to the outer diameter of the circular ring of the fourth metal patch (9); the length and width of the two strip-shaped sheets of the fifth metal patch (12) are equal.
CN202310854142.3A 2023-07-13 2023-07-13 Low-profile dual-frequency Fabry-Perot resonant cavity antenna Pending CN116581546A (en)

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Application publication date: 20230811