CN113809542B - 2.5-dimensional broadband miniaturized frequency selection surface based on padlock structure - Google Patents
2.5-dimensional broadband miniaturized frequency selection surface based on padlock structure Download PDFInfo
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- CN113809542B CN113809542B CN202111071666.2A CN202111071666A CN113809542B CN 113809542 B CN113809542 B CN 113809542B CN 202111071666 A CN202111071666 A CN 202111071666A CN 113809542 B CN113809542 B CN 113809542B
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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
Abstract
The invention discloses a 2.5-dimensional broadband miniaturized frequency selection surface based on a padlock structure, wherein each frequency selection unit comprises a dielectric layer, a first metal patch layer, a second metal patch layer and a metalized through hole; the first patch layer comprises a plurality of strip patches and annular patches, the strip patches are arranged in a direction parallel to one side of the medium layer, and the first patch layer comprises a first patch group, a second patch group and a third patch group which are symmetrically distributed along a perpendicular bisector parallel to one side of the medium layer; the second patch layer has the same structure as the first patch layer and is rotationally symmetrical at 90 degrees relative to the normal direction of the dielectric layer; because the metal patch layer patches are arranged in parallel, the frequency selection units are arranged in a staggered mode through simple translation to form a buckling and locking structure, and the bandwidth of the frequency selection surface is expanded while the miniaturization design is achieved.
Description
Technical Field
The invention relates to the technical field of electromagnetic fields and microwaves, in particular to a 2.5-dimensional broadband miniaturized frequency selection surface based on a buckling structure.
Background
The frequency selective surface is an electromagnetic periodic structure with filter characteristics, and has selective characteristics on electromagnetic waves with different working frequencies, polarization modes and incident angles.
The ideal frequency selective surface is an infinite periodic structure, and in practical application, the frequency selective surface needs to be designed with small unit size, so that a sufficient number of units can be gathered in a limited area to maintain the characteristics of the frequency selective surface. In addition, miniaturization design is an effective idea for improving polarization and angle stability of the frequency selective surface.
2.5-dimensional structures are generally based on planar periodic structures with the introduction of metallized vias in the dielectric layer for the reduction of the cell size of the frequency selective surface. Similar to the miniaturization of the unit by bending the metal patch, the increase in the degree of miniaturization often results in a reduction in the operating bandwidth of the frequency selective surface. At present, a 2.5-dimensional structure is widely applied to miniaturization design of a band-stop frequency selection surface, few researches on how to improve the bandwidth of the 2.5-dimensional frequency selection surface are made by focusing on improvement of polarization and angle stability of the frequency selection surface, and the realization of broadband miniaturization frequency selection surface design by using the 2.5-dimensional structure is a research difficulty.
Disclosure of Invention
The purpose of the invention is as follows: in view of the problems in the background art, the invention provides a 2.5-dimensional broadband miniaturization frequency selection surface based on a padlock structure, which expands the working bandwidth of the frequency selection surface while realizing the miniaturization of a unit.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the technical scheme that:
a2.5-dimensional broadband miniaturization frequency selection surface based on a buckling structure comprises a plurality of frequency selection units which are arranged in a staggered mode and are in the buckling structure; the single frequency selection unit comprises a medium layer, a first patch layer and a second patch layer, wherein the first patch layer and the second patch layer are respectively arranged on the opposite surfaces of the medium layer;
the first patch layer comprises a plurality of strip patches and annular patches, and the annular patches are arranged at two ends of each strip patch; the strip-shaped patches are arranged along a direction parallel to one side of the medium layer, the first patch layers are symmetrically distributed along a perpendicular bisector parallel to one side of the medium layer, and the first patch layers, the second patch layers and the third patch layers are outwards arranged along the perpendicular bisector and respectively comprise a first patch group, a second patch group and a third patch group; the first patch group comprises two short strip-shaped patches symmetrically arranged along the orthogonal direction of the perpendicular bisector, and independent circular patches are respectively arranged on the outer sides of two ends of each short strip-shaped patch; the second patch group comprises two middle strip patches symmetrically arranged along the orthogonal direction of the perpendicular bisector; the third patch group comprises a strip patch, and the middle section of the third patch group is also provided with two circular patches; the circular patch is rotationally symmetrical at 90 degrees relative to the normal direction of the dielectric layer;
the second patch layer has the same structure as the first patch layer and is rotationally symmetrical at 90 degrees relative to the normal direction of the medium layer;
metallized through holes are formed in the positions of the circular patches on the first patch layer and are communicated with the circular patches on the two sides of the dielectric layer.
Furthermore, the middle strip patch upper end point circular patch is parallel to the independent circular patch, and the shortest distance from the circular patch in the middle section of the strip patch to the end circular patch is equal to the vertical distance from the middle strip patch end point to the independent circular patch.
Furthermore, the dielectric layer is a square with the side length of p, the surface of the dielectric layer in the frequency selection unit is a square with the side length of p, a single frequency selection unit randomly selects one direction to translate p/2, then selects another different direction to translate p/2, and then the position of the other frequency selection unit can be obtained, and the two frequency selection units form a locking structure; and by analogy, obtaining a 2.5-dimensional broadband miniaturized frequency selective surface based on a padlock structure.
Furthermore, the dielectric layer adopts an FR4 material with a relative dielectric constant of 4.3 and a loss tangent of 0.025.
Has the beneficial effects that:
the frequency selection surface provided by the invention has the characteristic of miniaturization, the 2.5-dimensional resonance units are arranged in a staggered mode to form a buckling and locking structure, each unit is interwoven with the four surrounding units, and the planar space is fully utilized. Compared with the condition that the basic units are not locked, the number of the units is doubled in a certain area, and the periodicity is more easily embodied. The frequency selective surface element has an equivalent dimension of 0.033 λ × 0.033 λ, λ being a wavelength at a resonance frequency when the electromagnetic wave is perpendicularly incident to the frequency selective surface.
The frequency selective surface provided by the invention also has a broadband characteristic, and the units are arranged in a staggered manner, so that the coupling of adjacent units is enhanced, and the working bandwidth of the frequency selective surface is greatly expanded. The frequency selection surface resonates at 2.265GHz, the attenuation of a stop band exceeds 10dB and the relative bandwidth reaches 94.8% within the frequency band range from 1.255GHz to 3.515GHz, and a research basis is provided for increasing unit coupling and expanding the working bandwidth of the miniaturized frequency selection surface.
Drawings
FIG. 1 is a three-dimensional structure diagram of a 2.5-dimensional broadband miniaturized frequency selection unit based on a latch structure according to the present invention;
FIG. 2a is a patch distribution diagram of a first patch layer of a 2.5-dimensional broadband miniaturized frequency selective unit based on a padlock structure according to the present invention;
FIG. 2b is a patch distribution diagram of a second patch layer of the 2.5-dimensional broadband miniaturized frequency selective unit based on the padlock structure according to the present invention;
FIG. 3 is a schematic diagram of an arrangement of 2.5-dimensional broadband miniaturized frequency selective units based on a latch structure according to the present invention;
FIG. 4 is a transmission coefficient of a 2.5-dimensional broadband miniaturized frequency selective surface based on a latch structure under a change of an oblique incident angle when a TE polarized wave is incident;
fig. 5 shows the transmission coefficient of a 2.5-dimensional broadband miniaturized frequency selective surface based on a snap-lock structure under the change of an oblique incident angle when a TM polarized wave is incident.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
The invention provides a 2.5-dimensional broadband miniaturization frequency selection surface based on a buckling lock structure, which comprises M multiplied by N frequency selection units which are periodically arranged, wherein M is more than or equal to 5,N is more than or equal to 5, the frequency selection surface unit is of a 2.5-dimensional structure, and adjacent units are arranged in a staggered mode to form the buckling lock structure. Wherein the frequency selective element structure is shown in fig. 1.
The single frequency selection unit comprises a medium layer, and a first patch layer and a second patch layer which are respectively arranged on the opposite surfaces of the medium layer.
The dielectric layer material is an FR4 material with a relative dielectric constant of 4.3 and a loss tangent of 0.025, and is square, the side length is p =6.2mm, and the thickness is h =1mm.
The first patch layer structure is shown in fig. 2a and includes a plurality of strip patches and ring patches. And two ends of each strip patch are provided with circular patches. All strip-shaped patches are arranged in the direction parallel to the edge of the medium layer, and the first patch layers are symmetrically distributed along the perpendicular bisector parallel to one side of the medium layer. The first patch group, the second patch group and the third patch group are sequentially arranged along the perpendicular bisector outwards. The first patch group comprises two short strip patches symmetrically arranged in the orthogonal direction of the perpendicular bisector, and independent circular patches are respectively arranged on the outer sides of two ends of each short strip patch. The line width of the short strip patch is w =0.2mm, and the distance between the centers of the circular rings at two ends is l 5 ＝1mm。
The second patch group includes two middle strip patches symmetrically arranged in the orthogonal direction of the perpendicular bisector. The line width of the middle strip patch is w =0.2mm, and the distance between the centers of the circular rings at two ends is l 3 ＝2mm。
The third patch group comprises a strip patch, and two circular patches are arranged at the middle section of the third patch group. The line width of the long strip patch is w =0.2mm, and the distance between the centers of the circular rings at two ends is l 1 =3.6mm, the distance between the centers of the middle pair of rings is 1.6mm.
The annular patches in fig. 2a are all the same size, with an annular width rr =0.13mm and an annular inner diameter r =0.2mm. The circular patch is rotationally symmetrical at 90 degrees relative to the normal direction of the dielectric layer.
The second patch layer has the same structure as the first patch layer, and is rotationally symmetric about the normal direction of the dielectric layer by 90 degrees, as shown in fig. 2 b.
And metallized through holes are formed in the positions of the circular ring patches of the first patch layer. The metalized via hole is communicated with the circular patch on the two sides of the dielectric layer, the diameter of the metalized via hole is r =0.2mm, and the diameter of the metalized via hole is the same as the inner diameter of the circular patch.
The schematic arrangement diagram of the frequency selective surface units is shown in fig. 3, and as the metal patch layer patches are arranged in parallel, the frequency selective basic units can be staggered and arranged through simple translation to form a locking structure. The basic unit is a square unit, and the side length is p =6.2mm. After staggered arrangement, a single frequency selection unit randomly selects one direction to translate p/2, then selects another different direction to translate p/2, and then obtains the position of another frequency selection unit, the two units form a locking structure, and the distance between the centers of the adjacent units is p/V2. One basic unit and four surrounding basic units are interwoven together, the patch of the latter unit is positioned in the gap of the patches of other units after staggered arrangement, more basic resonance units are concentrated in a certain area, and the size of the unit is greatly reduced. In addition, the unit is arranged in a staggered mode to form a locking structure, coupling of adjacent units is enhanced, and the working bandwidth of the frequency selection surface is greatly expanded.
The technical effects of the invention are further explained by simulation experiments as follows:
1. simulation conditions and simulation contents:
the simulation utilized commercial software CST STUDIO SUITE 2016.
Simulation 2 is a simulation of a transmission coefficient curve of TM waves from an incident angle of 0 ° to 30 ° in the example of the present invention, and the result is shown in fig. 5.
2. And (3) simulation result analysis:
as shown in fig. 4 and 5, the transmission coefficient curves of the frequency selective surface are respectively the incidence angles of the TE polarized electromagnetic wave and the TM polarized electromagnetic wave from 0 ° to 30 °. It can be seen that the resonant frequency of the frequency selective surface is 2.265GHz, the equivalent dimension of the cell is 0.033 λ × 0.033 λ, and λ is the wavelength corresponding to the resonant frequency when the electromagnetic wave perpendicularly enters the frequency selective surface. Within the frequency band range of 1.255GHz to 3.515GHz, the attenuation of the stop band exceeds 10dB, and the relative bandwidth of-10 dB reaches 94.8 percent. Simulation results show that the frequency selective surface has both cell miniaturization and broadband characteristics. At an angle of incidence below 30 deg., the frequency selective surface has good stability.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (4)
1. A2.5-dimensional broadband miniaturization frequency selection surface based on a padlock structure is characterized in that the frequency selection surface comprises a plurality of frequency selection units which are arranged in a staggered mode and are in the padlock structure; the frequency selection unit comprises a medium layer, a first patch layer and a second patch layer which are respectively arranged on the opposite surfaces of the medium layer;
the first patch layer comprises a plurality of strip patches and annular patches, and the annular patches are arranged at two ends of each strip patch; the strip-shaped patches are arranged along a direction parallel to one side of the medium layer, the first patch layers are symmetrically distributed along a perpendicular bisector parallel to one side of the medium layer, and the first patch layers, the second patch layers and the third patch layers are outwards arranged along the perpendicular bisector and respectively comprise a first patch group, a second patch group and a third patch group; the first patch group comprises two short strip-shaped patches symmetrically arranged along the orthogonal direction of the perpendicular bisector, and the outer sides of two ends of each short strip-shaped patch are respectively provided with an independent circular patch; the second patch group comprises two middle strip-shaped patches symmetrically arranged along the orthogonal direction of the perpendicular bisector; the third patch group comprises a strip patch, and the middle section of the third patch group is also provided with two circular patches; the circular patch is rotationally symmetrical at 90 degrees relative to the normal direction of the dielectric layer;
the second patch layer has the same structure as the first patch layer and is rotationally symmetrical at 90 degrees relative to the normal direction of the dielectric layer;
metallized through holes are formed in the positions of the circular patches on the first patch layer and are communicated with the circular patches on the two sides of the dielectric layer.
2. The 2.5-dimensional broadband miniaturized frequency selective surface based on a padlock structure as claimed in claim 1, wherein the middle strip patch upper end ring patch is parallel to the independent ring patch, and the shortest distance from the ring patch in the middle section of the strip patch to the end ring patch is equal to the perpendicular distance from the middle strip patch end to the independent ring patch.
3. A 2.5 dimensional broadband miniaturized frequency selective surface based on a snap-lock structure as claimed in claims 1-2, wherein the dielectric layer surface in the frequency selective unit is a square with a side length of p, and a single frequency selective unit randomly selects one direction to shift p/2, and then selects another different direction to shift p/2, so as to obtain another frequency selective unit position, which forms a snap-lock structure; and by analogy, obtaining a 2.5-dimensional broadband miniaturized frequency selective surface based on the padlock structure.
4. The 2.5-dimensional broadband miniaturized frequency selective surface according to claim 1, wherein the dielectric layer is made of FR4 material with a relative dielectric constant of 4.3 and a loss tangent of 0.025.
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| CN107834195A (en) * | 2017-12-05 | 2018-03-23 | 上海无线电设备研究所 | A kind of frequency-selective surfaces antenna house |
| CA3016950A1 (en) * | 2017-09-11 | 2019-03-11 | Thales | Polarizing reflector for multiple beam antennas |
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| CN112332109B (en) * | 2020-10-22 | 2021-06-08 | 西安电子科技大学 | Broadband wave-transmitting type frequency selective wave absorber based on 2.5D structure |
| CN112751205B (en) * | 2020-12-25 | 2021-11-05 | 南京航空航天大学 | Double-layer medium 2.5-dimensional band-stop frequency selection surface |
| CN113381194B (en) * | 2020-12-25 | 2023-06-02 | 中国航空工业集团公司沈阳飞机设计研究所 | Frequency selective wave absorber |
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| CA3016950A1 (en) * | 2017-09-11 | 2019-03-11 | Thales | Polarizing reflector for multiple beam antennas |
| CN107834195A (en) * | 2017-12-05 | 2018-03-23 | 上海无线电设备研究所 | A kind of frequency-selective surfaces antenna house |
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