CN114389048A - Frequency selection surface unit structure and surface structure of X-band transmission - Google Patents
Frequency selection surface unit structure and surface structure of X-band transmission Download PDFInfo
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- CN114389048A CN114389048A CN202210116391.8A CN202210116391A CN114389048A CN 114389048 A CN114389048 A CN 114389048A CN 202210116391 A CN202210116391 A CN 202210116391A CN 114389048 A CN114389048 A CN 114389048A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—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
- H01Q15/0026—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 said selective devices having a stacked geometry or having multiple layers
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Abstract
The invention discloses a frequency selective surface unit structure and a surface structure of X-band transmission, which relate to the technical field of microwaves, wherein the unit structure comprises a first medium base layer, a second medium base layer and an air layer between the first medium base layer and the second medium base layer; a square annular metal patch and a cross metal patch are arranged on one side of the first medium base layer close to the second medium base layer; one side of the second medium base layer, which is far away from the first medium base layer, is provided with two square ring-shaped metal patches. The surface unit structure for selecting the frequency of the X-waveband wave-transmitting wave and the surface structure formed according to the unit structure can improve the reflection effect of a reflection frequency band, have better in-band transmission coefficient and wider bandwidth of a wave-transmitting frequency band, thereby realizing the effects of in-band broadband wave-transmitting and out-of-band reflection of the X-waveband.
Description
Technical Field
The invention relates to the technical field of microwaves, in particular to a frequency selection surface unit structure and a surface structure of X-band transmission waves.
Background
The X-band refers to electromagnetic waves with a frequency range from 8GHz to 12GHz, and is widely applied to the fields of radar detection and satellite communication.
The frequency selective surface has unique polarization selective characteristics, such as converting linear polarized incident waves into circularly polarized waves, converting horizontal polarized incident waves into vertical polarized waves, and the like. Frequency selective surfaces have been widely used in radome, reflector, polarization sensor, microwave sensor, spatial filter, etc. based on their unique characteristics. A frequency selective surface is a two-dimensional periodic structure with planar metal array elements (patches or aperture elements smaller than the operating wavelength) on a dielectric substrate, which shows transmission and reflection properties at a certain resonance frequency-the frequency selective surface structure will produce good reflection properties within a certain frequency range of its stop band. However, the existing frequency selective surface structure has technical defects of poor transmission, narrow bandwidth and the like for the electromagnetic wave in the X band, so how to overcome the above problems is a technical problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a frequency selective surface unit structure and a surface structure of X-band transmission.
In order to achieve the above purpose, the invention provides the following technical scheme:
a frequency selective surface unit structure of X-waveband transmission comprises a first medium base layer, a second medium base layer, and an air layer between the first medium base layer and the second medium base layer;
a metal patch is arranged on one side of the first medium base layer close to the second medium base layer;
and one side of the second medium base layer, which is far away from the first medium base layer, is only provided with a metal patch.
The metal patch arranged on the first medium base layer comprises a first square-shaped annular metal patch arranged on the periphery of the first medium base layer and a cross-shaped metal patch arranged on the inner periphery of the first medium base layer.
The metal patch arranged on the second medium base layer comprises a second square ring-shaped metal patch arranged on the periphery of the second medium base layer and a third square ring-shaped metal patch arranged on the inner periphery of the second medium base layer.
Optionally, the first dielectric substrate and the second dielectric substrate are both F4B dielectric slabs with a dielectric constant of 2.65, a loss angle of 0.0013, and a thickness of 0.5 mm.
Optionally, the surface element structure has a size of 1/2 corresponding to the wavelength of the operating center frequency.
Optionally, the surface unit structure has a size of 15 mm.
Optionally, the size of the second square ring-shaped metal patch on the periphery of the second dielectric base layer is as follows: width updl 0.5mm, side length upl 14.3 mm; the third square annular metal patch on the inner periphery of the second medium base layer has the following dimensions: width updl20.5mm, side length upl2＝5mm。
Optionally, the first square annular metal patch at the periphery of the first dielectric base layer has the following dimensions: width dl is 0.5mm, side length l is 14.6 mm; the size of the cross-shaped metal patch on the inner periphery of the first medium base layer is as follows: length l27mm, width w2＝0.8mm。
A frequency selective surface structure of X-band transmission waves is formed by arranging the unit structures of the frequency selective surface in a periodic rectangular array.
Through the technical scheme, the invention discloses and provides a frequency selective surface unit structure and a surface structure of X-band transmission waves, and compared with the prior art, the X-band transmission waves have the following beneficial effects:
the invention discloses a frequency selective surface unit structure of X-waveband transmission and a surface structure formed according to the unit structure, wherein a first medium base layer is provided with a square ring-shaped metal patch and a cross-shaped metal patch, a second medium base layer is provided with two square ring-shaped metal patches, the transmission coefficient in a band is better, the bandwidth of a transmission frequency band is wider, and thus the transmission of broadband in the band and the reflection out of the band are realized. In addition, the invention designs the size of the unit structure, the thickness of the dielectric layer and the like by an equivalent circuit method to obtain the optimal unit structure parameters. And the working frequency band of the frequency selection surface structure can be changed by adjusting the sizes of the unit structures and the sizes of the metal patches.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a frequency selective surface unit structure according to the present invention;
FIG. 2 is a general schematic diagram of a frequency selective surface structure according to the present invention;
FIG. 3(a) is a schematic diagram of a first dielectric base layer structure of a frequency selective surface unit structure according to the present invention;
FIG. 3(b) is a schematic diagram of a second dielectric substrate structure of the frequency selective surface unit structure of the present invention;
FIG. 4 is an equivalent circuit diagram of the frequency selective surface unit structure of the present invention;
FIG. 5(a) is a graph of transmission coefficient simulation for a frequency selective surface unit structure of the present invention;
FIG. 5(b) is a graph showing a simulation of the reflection coefficient of the frequency selective surface unit structure of the present invention;
wherein, 1 is a first medium base layer, 2 is a second medium base layer, 3 is an air layer, 4 is a first square annular metal patch, 5 is a cross metal patch, 6 is a second square annular metal patch, and 7 is a third square annular metal patch; 11 is a first dielectric substrate of a frequency selective surface structure, 12 is an air layer of a frequency selective surface structure, and 13 is a second dielectric substrate of a frequency selective surface structure.
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.
The embodiment of the invention discloses a frequency selective surface unit structure of X-band transmission, which is shown in figure 1 and comprises a first medium base layer 1, a second medium base layer 2, and an air layer 3 between the first medium base layer 1 and the second medium base layer 2;
a metal patch is arranged on one side of the first medium base layer 1 close to the second medium base layer 2;
and a metal patch is arranged on one side of the second medium base layer 2, which is far away from the first medium base layer 1.
In a specific embodiment, the metal patches arranged on the first dielectric base layer 1, which is described with reference to fig. 3(a), include a first square-ring-shaped metal patch 4 arranged on the periphery of the first dielectric base layer 1 and a cross-shaped metal patch 5 arranged on the inner periphery of the first dielectric base layer 1.
In a specific embodiment, referring to fig. 3(b), the metal patches arranged on the second dielectric base layer 2 include a second square ring-shaped metal patch 6 arranged on the periphery of the second dielectric base layer 2 and a third square ring-shaped metal patch 7 arranged on the inner periphery of the second dielectric base layer 2.
The embodiment of the invention also provides a frequency selective surface structure of the X-waveband transmission, and referring to fig. 2, the frequency selective surface structure is formed by arranging frequency selective surface unit structures in a periodic rectangular array.
An equivalent circuit model of the frequency selective surface unit structure of the present invention is shown in FIG. 4, Z0Representing wave impedance of free space, ZF2Is the equivalent impedance, Z, of the first dielectric substrate 1F1Is the equivalent impedance, Z, of the second dielectric substrate 21Representing the wave impedance of the spacer layer. Transfer matrix from FIG. 4
The relation between the input and the output of the cascade network is solved, and then the expression form of the scattering matrix, namely the S parameter, can be solved by utilizing the relation between the transfer matrix and the scattering matrix:
wherein the content of the first and second substances,
characterizing the relationship of the total input voltage and total input current at port 1 to the total output voltage and total output current at port 2,
f is the operating frequency, c is the speed of light in vacuum, εr1Is the relative dielectric constant, h, of the dielectric substrate1Is the air layer thickness.
In order to realize in-band wave-transparent and out-band reflection, f is defined from low frequency to high frequency in sequence in the embodiment1、f2And f3At f1And f3Design of ideal index S11＝1，S 210, at f2Designed ideal index S11＝0，S21＝1。S11And S21Respectively, the reflection coefficient of port 1 and the forward transmission coefficient of port 1 to port 2.
Transforming the transition matrix to obtain S11And S21。
Wherein M ═ ZF1ZF2,N＝ZF1+ZF2,T＝ZF1-ZF2,
And
the middle dielectric layer is air, then Z1＝Z0Q is 0, according to the ideal target of design f1And f3At frequency S21When the value is 0, then ZF1ZF20, if ZF1Equal to 0, equivalent to a metal surface, total reflection will occur, so Z F20. Due to ZF1For complex impedance, Z isF1Substitution of R + jX into S11Expression of, by S11Available as 1:
at f2Is according to S 211, to S21Calculating to obtain:
when Z isF1ZF2→ infinity, denominator modulus | cos θ1+jsinθ 11, thus S 211. Therefore, as long as the upper layer and the lower layer are of band-pass structures, in-band wave-transmitting and out-of-band reflection can be realized.
The frequency selective surface structure with in-band wave-transparent out-of-band reflection needs to meet the following conditions:
1、Z1＝Z0the two square ring-shaped metal patches of the second medium base layer 2 and the square ring-shaped metal patches and the cross-shaped metal patches 5 of the first medium base layer 1 are separated by an air layer 3;
2、Z F20, namely, the frequency selection surface of the first square ring-shaped metal patch 4 and the cross-shaped metal patch 5 of the first dielectric substrate 1 needs to be f1And f3Resonance is generated.
Through the optimized design of the frequency selective surface structure, the final size is obtained: the size of the frequency selective surface unit structure is 15mm, and is about 1/2 of the wavelength corresponding to the central frequency; the size of the second square ring-shaped metal patch 6 on the periphery of the second medium base layer 2 is as follows: width updl 0.5mm, side length upl 14.3 mm; the third square annular metal patch 7 on the inner periphery of the second medium base layer 2 has the following dimensions: width updl20.5mm, side length upl25 mm; first square ring shape of first medium base layer 1 peripheryThe dimensions of the metal patch 4 are: width dl is 0.5mm, side length l is 14.6 mm; the size of the cross-shaped metal patch 5 enclosed in the first medium base layer 1 is as follows: length l27mm, width w2＝0.8mm。
In a specific embodiment, the first dielectric substrate 1 and the second dielectric substrate 2 are both F4B dielectric boards with a dielectric constant of 2.65, a loss angle of 0.0013, and a thickness of 0.5 mm.
As shown in fig. 5(a) -5 (b), the bandwidth of the transmission band greater than 3dB is 7.3GHz-14.2GHz within the frequency band (2GHz-20GHz) of the designed unit.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A frequency selective surface unit structure of X-band transmission is characterized by comprising a first medium base layer (1), a second medium base layer (2), and an air layer (3) between the first medium base layer (1) and the second medium base layer (2);
a metal patch is arranged on one side, close to the second medium base layer (2), of the first medium base layer (1);
one side of the second medium base layer (2) far away from the first medium base layer (1) is only provided with a metal patch;
the metal patches arranged on the first medium base layer (1) comprise a first square annular metal patch (4) arranged on the periphery of the first medium base layer (1) and a cross metal patch (5) arranged on the inner periphery of the first medium base layer (1);
the metal patch arranged on the second medium base layer (2) comprises a second square ring-shaped metal patch (6) arranged on the periphery of the second medium base layer (2) and a third square ring-shaped metal patch (7) arranged on the inner periphery of the second medium base layer (2).
2. The frequency selective surface unit structure of X-band transmission waves according to claim 1, wherein the first dielectric substrate (1) and the second dielectric substrate (2) are both F4B dielectric plates with dielectric constant of 2.65, loss angle of 0.0013 and thickness of 0.5 mm.
3. The frequency selective surface element structure of claim 1, wherein the surface element structure has dimensions of 1/2 corresponding to the wavelength of the center frequency of operation.
4. The frequency selective surface unit structure of claim 1, wherein the surface unit structure has a size of 15 mm.
5. The structure of a frequency selective surface unit of X-band transmission waves according to claim 1, wherein the dimensions of the second square-ring type metal patch (6) are: width updl 0.5mm, side length upl 14.3 mm; the third square ring-shaped metal patch (7) has the following dimensions: width updl20.5mm, side length upl2＝5mm。
6. The frequency selective surface unit structure of X-band transmission according to claim 1, wherein the dimensions of the first square ring-shaped metal patch (4) are: width dl is 0.5mm, side length l is 14.6 mm; the size of the cross-shaped metal patch (5) on the inner periphery of the first medium base layer (1) is as follows: length l27mm, width w2＝0.8mm。
7. A frequency selective surface structure of an X-band transmission wave, characterized by being constituted by arranging the frequency selective surface unit structures according to any one of claims 1 to 6 in a periodic rectangular array.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114914706A (en) * | 2022-05-25 | 2022-08-16 | 西安电子科技大学 | Reflection-type frequency selective polarization conversion super surface |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114914706A (en) * | 2022-05-25 | 2022-08-16 | 西安电子科技大学 | Reflection-type frequency selective polarization conversion super surface |
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