CN107404005B - Novel high-selectivity frequency selective surface based on single-layer PCB process - Google Patents
Novel high-selectivity frequency selective surface based on single-layer PCB process Download PDFInfo
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- CN107404005B CN107404005B CN201710791877.0A CN201710791877A CN107404005B CN 107404005 B CN107404005 B CN 107404005B CN 201710791877 A CN201710791877 A CN 201710791877A CN 107404005 B CN107404005 B CN 107404005B
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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 novel high-selectivity frequency selective surface based on a single-layer PCB process, and belongs to the technical field of electromagnetic fields and microwaves. The metal layer of the frequency selective surface comprises a plurality of metal units which are arranged periodically and can be used as antenna covers, metal reflecting surfaces and the like for military and civil fields; the frequency selective surface comprises an upper frequency selective surface metal layer and a lower frequency selective surface metal layer which have the same structure and a medium layer in the middle; the frequency selective surface metal unit comprises a metal square ring and four metal isosceles right triangles, and four corners of the square ring and the bottom side of the triangle are connected by four bent metal wires. The invention realizes the frequency band-pass filter characteristic, introduces a transmission zero point at two sides of the passband by using two layers of metal structures, reduces the transition band between the passband and the stopband, realizes abrupt drop at two sides of the passband, and realizes high selectivity of the frequency selection surface.
Description
Technical Field
The invention belongs to the technical field of electromagnetic fields and microwaves, and particularly relates to a high-selectivity frequency selective surface based on a single-layer PCB process.
Background
The frequency selective surface (Frequency selective surface, FSS) is a single-or multi-layer planar structure of identical units arranged periodically, and is not itself capable of absorbing energy, but has a filtering effect, essentially a spatial filter. The characteristics of the frequency selective surface are widely used in the fields of antenna systems, radomes, wireless security shields, etc.
In recent years, multi-frequency technology has received great attention in both civil communication and military fields, and has progressed rapidly. However, the integration of multiple subsystems of different frequencies in the same system may affect the overall system performance, and the use of frequency selective surfaces in these systems effectively isolates signals of different frequencies, minimizing the impact between them. The application of different frequencies also creates an increasing strain on the spectrum resources, so that high performance frequency selective surfaces are becoming a hotspot, where the nature of the bilateral steepness is particularly critical. The bilateral dip of the frequency selective surface can greatly reduce the transition band between the pass band and the stop band to make it approach to the ideal filtering performance. To realize the bilateral abrupt drop of the frequency selective surface transmission response, a multi-layer frequency selective surface cascade structure can be utilized, but the thickness of the whole frequency selective surface is very large and is often not suitable for practical application; the introduction of a transmission zero on each side of the passband also allows for a double-sided steep drop in the frequency selective surface transmission response.
For example, document Design and experimental verification of compact frequency-selective surface with quasi-elliptic bandpass response (G.Q.Luo, W.Hong, Q.H.Lai, K.Wu, and l.l. sun, "IEEE trans. Microw. Thory techn., vol.55, no.12, pp.2481-2487, dec.2007") proposes an integrated waveguide-based frequency selective surface, introducing a transmission zero on each side of the passband, achieving a steep drop between passband to stopband.
It is found from various documents that the frequency selective surface to achieve the bilateral steep drop can use multilayer frequency selective surface superposition or integrated waveguide technology, but these technologies are often very complex, so that the frequency selective surface processing is very difficult to manufacture and is difficult to achieve in practical application.
Disclosure of Invention
The invention aims to realize: in order to overcome the problem that in the prior art, a complex technology is required to realize the high-selectivity frequency selection surface and the high-selectivity frequency selection surface is difficult to process and realize in practical application, a novel high-selectivity frequency selection surface easy to realize is proposed.
In order to achieve the above purpose, the specific scheme is as follows:
the high-selectivity frequency selective surface is composed of a plurality of periodically distributed units, and each unit sequentially comprises a first metal layer, a dielectric layer and a second metal layer from top to bottom; the first metal layer and the second metal layer have the same structure size and are symmetrically arranged relative to the dielectric layer.
The first metal layer and the second metal layer mainly comprise square rings and four metal structures arranged in the square rings; the metal structure comprises a bending line and a triangular structure, one end of the bending line is connected with the inner angle of the square ring, the other end of the bending line is connected with the side length center of the triangular structure, and the four metal structures are distributed in a central symmetry manner;
further, the square ring, the bending line and the triangular structure of the frequency selective surface unit are made of metal.
Further, the material adopted by the dielectric layer of the frequency selective surface is F4B-2.
Further, the dielectric layer thickness is 2mm when the frequency selective surface operating frequency is in the vicinity of 4.8-5.1 GHz.
Further, the unit size of the frequency selective surface is 8.8mm x 8.8mm;
further, the size of the metal square ring is 8.8mm multiplied by 8.8mm, and the side width is 0.8mm;
further, the length of the metal bending line is 9.3mm, and the width of the metal bending line is 0.2mm;
further, the metal triangle is a right isosceles triangle, the waist length of the triangle is 2.4mm, and the distance between adjacent triangles is 0.4mm. One end of the bending line is connected with the inner angle of the square ring, and the other end is connected with the center of the bottom edge of the right-angled isosceles triangle.
Compared with the prior art, the invention has the beneficial effects that:
1. the frequency selective surface of the invention only needs one layer of medium and two layers of metal, only needs single-layer PCB processing, and is easy to process and realize.
2. According to the invention, the frequency band-pass filter characteristic is realized, two layers of metal structures are used for introducing a transmission zero point at two sides of a pass band respectively, so that the transition band between the pass band and a stop band is reduced, the bilateral abrupt drop at two sides of the pass band is realized, the transition band between the pass band and the stop band is reduced, and the high selectivity of the frequency selection surface is realized.
3. The transmission response in-band loss in the frequency selective surface is less than 1dB, and the frequency selective surface has good flat top characteristic.
4. The frequency selective surface of the present invention still has good transmission response under different polarizations and 45 oblique incidence.
5. The unit size of the frequency selective surface is one-seventh wavelength, and the frequency selective surface has the characteristic of miniaturization.
Drawings
FIG. 1 is a schematic diagram of a frequency selective surface metal unit according to the present invention;
FIG. 2 is a schematic diagram of a frequency selective surface structure according to the present invention, wherein (2) is a first metal layer, (3) is a dielectric layer, and (4) is a second metal layer;
FIG. 3 is a graph of simulated reflectance and transmittance for a frequency selective surface according to the present invention;
fig. 4 is a graph showing transmission of the frequency selective surface according to the present invention under 45 ° oblique incidence of electromagnetic waves: wherein, FIG. 4A is a transmission curve of TE waves; fig. 4B is a transmission curve of TM waves.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples.
As shown in fig. 1, the frequency selective surface metal unit structure of the present invention comprises a metal square ring (11) and four metal isosceles right triangles (13), and four corners of the square ring and the bottom side of the triangle are connected by four bent metal wires (12); fig. 2 is a schematic diagram of a frequency selective surface structure according to the present invention, which includes a first metal layer (2) of a frequency selective surface, a dielectric plate (3), and a second metal layer (4) of a frequency selective surface, wherein the first metal layer (2) of the frequency selective surface and the second metal layer (4) of the frequency selective surface are identical and symmetrical with respect to the dielectric plate (3).
The first metal layer (2) and the second metal layer (4) of the high-selectivity frequency selective surface are copper foils, the thickness of the dielectric layer (3) is 2mm, the dielectric material is F4B-2, the dielectric constant is 2.65, the size of a metal unit (1) is 8.8mm multiplied by 8.8mm, the side width of a metal square ring (11) is 0.8mm, four isosceles right triangles (13) with right angles 0.4mm apart are placed in the middle of the square ring, and the four corners of the triangle (13) and the square ring (11) are connected by metal bending lines (12) with the length of 9.3 mm.
When electromagnetic waves are perpendicularly incident, the electric field direction is equivalent to inductance when being parallel to the metal wires, and when the electric field direction is perpendicular to the metal wires, gaps between adjacent metal wires can be equivalent to capacitance. In the frequency selective surface metal unit, the metal bending lines (12) are equivalent to inductors, the gaps between adjacent metal triangles (13) are equivalent to capacitors, and the series capacitors and the inductors form series resonance to generate transmission zero points; and the metal bending lines (12), the gaps between the adjacent metal triangles (13) and the metal square rings (11) form parallel resonance to generate transmission poles. Therefore, a single-layer metal unit generates a transmission zero and a transmission pole (f Pole ＜f Zero point ) Two layers of metal units will generate two transmission zeros (f Zero point 1 And f Zero point 2 ) And two transmission poles (f Pole 1 And f Pole 2 ) When the thickness of the medium is large, the upper layer metal and the lower layer metal are not coupled, and the generated transmission zero point and the generated pole are f Pole 1 ＜f Pole 2 ＜f Zero point 1 ＜f Zero point 2 The method comprises the steps of carrying out a first treatment on the surface of the When the thickness of the medium is gradually reduced, the upper layer metal and the lower layer metal are coupled, the position of a transmission pole is almost unchanged, one transmission zero point moves towards the high frequency direction, one transmission zero point moves towards the low frequency direction to the left side of the transmission pole, and f Zero point 1 ＜f Pole 1 ＜f Pole 2 ＜f Zero point 2 A bandpass transmission response is obtained having a transmission zero on each side of the passband.
Simulation is carried out, and fig. 3 is a graph of a simulation reflection coefficient and a transmission coefficient of a frequency selective surface according to the present invention, wherein the abscissa is frequency, and the ordinate is S parameter. It can be seen that the center frequency of the frequency selective surface passband is 4.85GHz, the 3db bandwidth is about 0.26GHz (4.78 GHz-5.04 GHz), and the relative bandwidth is 5.36%. The maximum insertion loss in the passband is less than 1dB. In addition, in the figure, it can be clearly observed that the two transmission zeros are respectively at 4.7GHz and 6.1GHz, the introduction of the transmission zeros can greatly enhance the steep drop out of the pass-through band, and the selectivity of the frequency selective surface can be well realized. The unit size of the frequency selective surface is one seventh of resonance wavelength, and the frequency selective surface has the characteristic of miniaturization and is convenient for practical application.
As shown in fig. 4, the transmission curve chart of the high-selectivity frequency selective surface in the case of 45 ° oblique incidence of electromagnetic waves is shown in fig. 4A, wherein the transmission coefficient of TE waves is shown in fig. 4A; fig. 4B shows the transmission coefficient of TM waves. Under the incidence of TE waves, the bandpass is slightly reduced, the insertion loss in the passband is slightly increased, and the center frequency is almost unchanged; under the incidence of TM wave, the passband becomes larger, and the center frequency is not shifted. Therefore, the frequency selective surface of the present invention has good angular stability and polarization stability.
The foregoing is merely illustrative of the specific embodiments of this invention and other embodiments of this invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (8)
1. The novel high-selectivity frequency selective surface based on the single-layer PCB process consists of a plurality of periodically distributed units, and is characterized in that each unit has a size of one seventh wavelength and sequentially comprises a first metal layer, a dielectric layer and a second metal layer from top to bottom; the first metal layer and the second metal layer have the same structure size and are symmetrically arranged relative to the dielectric layer;
the first metal layer and the second metal layer are formed by square rings and four metal structures arranged in the square rings; the metal structure comprises a bending line and a triangular structure, one end of the bending line is connected with the inner angle of the square ring, the other end of the bending line is connected with the side length center of the triangular structure, and the four metal structures are distributed in a central symmetry manner;
the first metal layer and the second metal layer are used for respectively introducing a transmission zero point at two sides of the passband, so that the transition band between the passband and the stopband is reduced, the bilateral abrupt drop at two sides of the passband is realized, the transition band between the passband and the stopband is reduced, and the high selectivity of the frequency selection surface is realized.
2. A novel high selectivity frequency selective surface based on a single layer PCB process as claimed in claim 1, wherein the dielectric layer is made of F4B-2.
3. A novel high selectivity frequency selective surface based on a single layer PCB process as claimed in claim 1, characterized in that the dielectric layer thickness is 2mm when the frequency selective surface operates around 4.8-5.1 GHz.
4. A novel highly selective frequency selective surface based on a single layer PCB process according to claim 1, characterized in that the cell size is 8.8mm x 8.8mm.
5. A novel high selectivity frequency selective surface based on a single layer PCB process according to claim 1, characterized in that the metal square ring width is 0.8mm.
6. A novel high selectivity frequency selective surface based on a single layer PCB process according to claim 1, characterized in that the metal meander line length is 9.3mm and the line width is 0.2mm.
7. A novel high selectivity frequency selective surface based on a single layer PCB process as claimed in claim 1, characterized in that the metal triangle is a right isosceles triangle with a waist length of 2.4mm.
8. A novel high selectivity frequency selective surface based on a single layer PCB process as claimed in claim 1, characterized in that the pitch of adjacent triangles is 0.4mm.
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Families Citing this family (5)
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| CN110829018B (en) * | 2019-11-15 | 2020-11-24 | 中国科学院长春光学精密机械与物理研究所 | Broadband wide-angle frequency selective surface radome |
| CN111969325B (en) * | 2020-06-23 | 2021-06-15 | 广州智讯通信***有限公司 | Frequency selection surface unit based on filter antenna and frequency selection surface |
| CN111786120A (en) * | 2020-07-06 | 2020-10-16 | 电子科技大学 | Miniaturized frequency selective surface structure with rectangular coefficient close to 1 |
| CN111987439B (en) * | 2020-07-27 | 2022-05-24 | 南京航空航天大学 | Miniaturized passive flexible band-pass frequency selection surface for antenna housing |
| CN113300112B (en) * | 2021-05-17 | 2022-05-31 | 广东福顺天际通信有限公司 | Reflecting plate and reflector with switchable working states |
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