CN107623157A - A kind of dual-passband design method based on multi-screen frequency-selective surfaces - Google Patents
A kind of dual-passband design method based on multi-screen frequency-selective surfaces Download PDFInfo
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Abstract
A kind of dual-passband design method based on multi-screen frequency-selective surfaces of the present invention belongs to electromagnetic wave and microwave technical field, is related to a kind of dual-passband design method of multi-screen frequency-selective surfaces, and the filtering characteristic with dual-passband frequency can be achieved.In design method, using three screen FSS and the medium substrate being placed in parallel for two layers, three screen FSS are parallel and symmetrical relative to medium substrate, frequency-selective surfaces cellular construction arrangement mode is square arrangement, and arrangement is followed successively by upper surface metal level, upper dielectric layer, intermediate metal layer, lower dielectric layer, lower surface metal layer from top to bottom.This method uses the symmetrical structure of three screen FSS cascades, the U-shaped rotational symmetry unit of use, improves the degree of miniaturization of structure, adds the flexibility of design, easily adjusts two frequency band spacing, realizes the dual-passband frequency characteristic with second-order filter characteristic.The present invention is simple in construction, it is easy to accomplish, pass-band loss is small, and bandwidth is wider, and steep cutoff performance is good.
Description
Technical field
The invention belongs to electromagnetic wave and microwave technical field, is related to a kind of dual-passband based on multi-screen frequency-selective surfaces and sets
Meter method, the filtering characteristic of the dual-passband frequency with second-order filter characteristic can be achieved.
Background technology
Frequency-selective surfaces (Frequency Selective Surface, abbreviation FSS) refer to the gold by periodic arrangement
Belong to the one-dimensional or periodic array in two dimensions structure that the aperture unit of cycle arrangement on unit or metal screen is formed, this periodic structure pair
Selective reflecting or transmissison characteristic is presented in the electromagnetic wave of different frequency.FSS is widely used in electricity as a kind of spatial filter
The various aspects in magnetic field, including for preparing the bandpass filter, multifrequency reflector antenna, artificial electromagnetic material of stealth radar cover
Material etc..
FSS units traditional at present mainly include annular, cross, Y shape, solid unit etc., can be achieved to different resonance
The transmission or reflection of frequency electromagnetic.The structure of these elementary cells is simple, and controllable parameter is less, it is impossible to meets well real
Border requires.For some of which unit, generally require by appropriate design to change their characteristic.Such as document
Y.Yang, X.-H.Wang, and H.Zhou " the double frequency-band frequency-selective surfaces based on miniaturization unit design ",
Progress in electromagnetics research letters, vol.33,167-175,2012, using single screen frequency
Two passbands are realized in rate selection surface to design, and the structure is combined by two square annular aperture units, by reducing two
The size in individual aperture improves degree of miniaturization.The structure realizes two passbands with stationary filtering characteristic, realizes one
Determine the miniaturization of degree.But use this single screen frequency-selective surfaces structure is difficult to realize there is edge cut-off property, wideband suddenly
The filtering characteristic of the performance such as band and flat characteristic.Normally only have edge steep using one layer of frequency-selective surfaces structure is difficult to realize
The filtering characteristic of the performances such as cut-off property, broadband and flat characteristic, thus double screen and multi-screen FSS research are more and more concerned,
And with the development of multi-band communication and multifrequency Detection Techniques, how to rationally design multilayer FSS structural parameters and possess width to realize
Frequency band, stability is good, the double frequency-band frequency-selective surfaces structure of the premium properties such as cut-off property, miniaturization suddenly, it has also become FSS's grinds
Study carefully focus and development trend.
The content of the invention
The present invention invents to solve the technical problem such as poor, narrow bandwidth of FSS filtering characteristics edge cut-off property in the prior art
A kind of dual-passband design method based on multi-screen frequency-selective surfaces.Design method is using three screen FSS and is placed in parallel for two layers
Medium substrate layer, three screen FSS are parallel and symmetrical relative to dielectric layer, load on respectively in the centre of two substrates and upper and lower surface.
Upper and lower two screens FSS is the Central Symmetry unit formed by the annular chip unit composite U-shaped rotation chip unit in side, and FSS is shielded in centre
For grid chip unit.Two screen side's annular chip units and middle screen grid cell in the present invention couple shape by two layer medium
Into the first passband, and U-shaped rotates chip unit with the annular chip unit in side by constructing two transmission zeros, to form second
Passband, make the present invention that there is good steep cut-off, there is stable filtering characteristic and low insertion loss.
The technical solution adopted by the present invention is a kind of dual-passband design method based on multi-screen frequency-selective surfaces, its feature
It is that in design method, using three screen FSS and the medium substrate being placed in parallel for two layers, three screen FSS are parallel and relative to medium substrate
Symmetrically, frequency-selective surfaces cellular construction arrangement mode is square arrangement, and arrangement is followed successively by from top to bottom：Upper surface metal level
1st, upper dielectric layer 2, intermediate metal layer 3, lower dielectric layer 4, lower surface metal layer 5；Upper and lower surface metal-layer 1,5 is that structure is identical
Periodic structure, be the Central Symmetry unit formed by side's annular chip unit composite U-shaped rotation chip unit, intermetallic metal
Layer 3 is grid chip unit；Two layers of the side's annular chip unit and the grid cell of intermediate metal layer 3 of upper and lower surface metal-layer 1,5
Couple to form the first passband by two layer medium, and the annular chip unit of U-shaped rotation chip unit and side is by constructing two
Transmission zero, to form the second passband, so as to construct second-order filter characteristic.
According to a kind of dual-passband design method based on multi-screen frequency-selective surfaces described in claim 1, it is characterized in that,
The material of the three screens FSS metal screens is Au, Cu, Ag or Al, using photoetching technique or printed circuit board (PCB) preparation technology, is prepared
In two layer medium substrate；Centre screen FSS grid paster structure is criss-cross grid paster or hexagonal grid paster.
According to a kind of dual-passband design method based on multi-screen frequency-selective surfaces described in claim 1 or 2, its feature
It is a quarter of resonant frequency wavelength centered on the gross thickness of two layers of symmetrically placed medium substrate.
The beneficial effects of the invention are as follows the symmetrical structure using three screen FSS cascades, realize with second-order filter characteristic
Dual-passband, flat characteristic is obtained, pass-band loss is small, and bandwidth is wider, and steep cutoff performance is good.It is single by designing U-shaped rotational symmetry
Member, the degree of miniaturization of structure is improved, add the flexibility of design, easily adjust two frequency band spacing.The present invention is simple in construction,
It is easily achieved with second-order filter characteristic, the dual-passband transmission characteristic for flat-top can be achieved, ending suddenly.It is more that FSS can be applied to microwave
Frequency communicates, in the radome of equipment such as electronic countermeasure.
Brief description of the drawings
Fig. 1 is the schematic diagram of bi-pass band frequency selective surface structure, in figure：1- upper surfaces metal level, the upper medium substrates of 2-
Layer, 3- intermediate metal layers, medium substrate layer under 4-, 5- lower surface metal layers, h- thickness.
Fig. 2 is the structural parameters figure of upper and lower surface metal-layer 1,5, and Fig. 3 is the structural parameters figure of intermediate metal layer 3.Its
In, Dx-X is to array period, and Dy-Y is to array period, the outer length of side of l- side's annular element, w- line widths, n-U shape unit transverse outer arms
It is long, the outer brachium in e- longitudinal directions, s- line widths, g- raster widths.
Fig. 4 is transmission coefficient curve map of the frequency-selective surfaces structure when TE polarizes, abscissa-frequency (GHZ), indulge and sit
Mark-transmission coefficient (dB).
Fig. 5 is transmission coefficient curve map of the frequency-selective surfaces structure when TM polarizes, abscissa-frequency (GHZ), indulge and sit
Mark-transmission coefficient (dB).
Embodiment
Make further describe in detail to the present invention with technical scheme below in conjunction with the accompanying drawings.
As shown in figure 1, in the present embodiment, the symmetrical structure arrangement mode of the three screen FSS cascades used for square arrangement,
Upper surface metal level 1, upper medium substrate layer 2, intermediate metal layer 3, lower medium substrate layer 4, lower surface gold are followed successively by from top to bottom
Belong to layer 5.
Fig. 2, Fig. 3 represent the structural parameters figure of upper and lower surface metal-layer 1,5 and intermediate metal layer 3, take X to Y-direction battle array
Cycle Dx=Dy=4mm is arranged, upper and lower metal level 1,5 is structure identical periodic structure, by the annular chip unit in side and U-shaped
Rotary unit is combined.Wherein, the outer length of side l=3.8mm, line width w=0.2mm of square annular element.The outer brachium of U-shaped unit transverse
N=2.6mm, longitudinal direction outer brachium e=2.1mm, its line width s=0.1mm.Intermediate metal layer 3 is square grid patch array, grid
Width g=1mm.The material of upper and lower medium substrate layer substrate and structural parameters are identical used by the present embodiment, are FR4, are situated between
Electric constant εr=2.65, thickness h=1mm.To improve degree of miniaturization and design flexibility, using non-traditional resonant element U-shaped
Resonant element of the rotary unit as the second resonance frequency band.
Simulation analysis are carried out respectively to the transmission coefficient of the Multilayer Frequency-Selective Surfaces structure of the present embodiment, Fig. 4 and Fig. 5 divide
Transfer curve when not giving electromagnetic wave vertical incidence under TE polarization modes and TM polarization modes, corresponding data are such as
Shown in table 1.
Index contrasts of the FSS of table 1 under not same polarization side
From Fig. 4, Fig. 5, the frequency-selective surfaces structure of the design method can realize two stable passbands, center
Resonant frequency is respectively 9.2GHz and 15.8GHz, and -3dB relative bandwidths respectively reach 24.2% and 6.3%, and frequency band is wider.And
The quality factor of two passbands obtained by the structure are larger.
The present invention has good steep cut-off.It is described herein from the data comparison under two kinds of polarization modes in table
Frequency-selective surfaces structure under different polarization modes center resonant frequency and the equal very little of bandwidth offset, thus with stable
Filtering characteristic.The present invention can provide broadband, low insertion loss, the dual-passband with steep cut-off characteristics.
Claims (3)
1. a kind of dual-passband design method based on multi-screen frequency-selective surfaces, it is characterized in that, in design method, using three screens
FSS and the medium substrate being placed in parallel for two layers, three screen FSS are parallel and symmetrical relative to medium substrate, frequency-selective surfaces unit
Structural assignments mode is square arrangement, and arrangement is followed successively by from top to bottom：Upper surface metal level (1), upper dielectric layer (2), centre
Metal level (3), lower dielectric layer (4), lower surface metal layer (5)；Upper and lower surface metal-layer (1,5) is structure identical periodicity
Structure, is the Central Symmetry unit formed by the annular chip unit composite U-shaped rotation chip unit in side, and intermediate metal layer (3) is
Grid chip unit；Two layers of the side's annular chip unit and intermediate metal layer (3) grid cell of upper and lower surface metal-layer (1,5)
Couple to form the first passband by two layer medium, and the annular chip unit of U-shaped rotation chip unit and side is by constructing two
Transmission zero, to form the second passband, so as to construct second-order filter characteristic.
2. according to a kind of dual-passband design method based on multi-screen frequency-selective surfaces described in claim 1, it is characterized in that, institute
The material for stating three screen FSS metal screens is Au, Cu, Ag or Al, using photoetching technique or printed circuit board (PCB) preparation technology, is prepared
In two layer medium substrate；Centre screen FSS grid paster structure is criss-cross grid paster or hexagonal grid paster.
3. according to a kind of dual-passband design method based on multi-screen frequency-selective surfaces described in claim 1 or 2, its feature
It is a quarter of resonant frequency wavelength centered on the gross thickness of two layers of symmetrically placed medium substrate.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108767486A (en) * | 2018-06-06 | 2018-11-06 | 哈尔滨工业大学 | Minimize dual layer elements and the frequency-selective surfaces containing the unit |
| CN109449601A (en) * | 2018-10-31 | 2019-03-08 | 宋应龙 | It is a kind of that surface cell is selected based on the ultra wide band frequency of low pass and band logical multi-layer-coupled |
| CN110085954A (en) * | 2019-04-26 | 2019-08-02 | 中国计量大学上虞高等研究院有限公司 | A kind of Fibonacci fractal structure Terahertz double-passband filter |
| CN110854543A (en) * | 2019-11-15 | 2020-02-28 | 电子科技大学 | Dual-frequency broadband wide-angle circularly polarized grid based on miniaturized unit |
| CN111009734A (en) * | 2019-10-24 | 2020-04-14 | 西安电子科技大学 | Dual-frequency FSS with closely spaced frequency response characteristics and unit structure thereof |
| CN112186362A (en) * | 2020-09-15 | 2021-01-05 | 重庆邮电大学 | Dual-frequency miniaturized frequency selective surface with complementary structure |
| CN112563757A (en) * | 2020-12-25 | 2021-03-26 | 安方高科电磁安全技术(北京)有限公司 | Frequency selective surface structure and third-order filter |
| CN112736481A (en) * | 2020-12-25 | 2021-04-30 | 南京航空航天大学 | Three-screen double-passband high-selectivity frequency selection surface and design method thereof |
| CN113258297A (en) * | 2021-05-27 | 2021-08-13 | 光谷技术有限公司 | Metamaterial filtering structure and gateway equipment |
| CN113394569A (en) * | 2021-06-30 | 2021-09-14 | 电子科技大学长三角研究院(湖州) | Low-profile dual-band wave-absorbing surface applied to vehicle-mounted radar test environment and manufacturing method thereof |
| CN113851801A (en) * | 2021-11-03 | 2021-12-28 | 武汉灵动时代智能技术股份有限公司 | Bandwidth-stable frequency selective surface structure based on pole coupling and splitting |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108767486A (en) * | 2018-06-06 | 2018-11-06 | 哈尔滨工业大学 | Minimize dual layer elements and the frequency-selective surfaces containing the unit |
| CN109449601A (en) * | 2018-10-31 | 2019-03-08 | 宋应龙 | It is a kind of that surface cell is selected based on the ultra wide band frequency of low pass and band logical multi-layer-coupled |
| CN110085954A (en) * | 2019-04-26 | 2019-08-02 | 中国计量大学上虞高等研究院有限公司 | A kind of Fibonacci fractal structure Terahertz double-passband filter |
| CN110085954B (en) * | 2019-04-26 | 2020-10-13 | 中国计量大学上虞高等研究院有限公司 | Fibonacci fractal structure terahertz dual-passband filter |
| CN111009734B (en) * | 2019-10-24 | 2021-09-03 | 西安电子科技大学 | Dual-frequency FSS with closely spaced frequency response characteristics and unit structure thereof |
| CN111009734A (en) * | 2019-10-24 | 2020-04-14 | 西安电子科技大学 | Dual-frequency FSS with closely spaced frequency response characteristics and unit structure thereof |
| CN110854543B (en) * | 2019-11-15 | 2021-03-30 | 电子科技大学 | Dual-frequency broadband wide-angle circularly polarized grid based on miniaturized unit |
| CN110854543A (en) * | 2019-11-15 | 2020-02-28 | 电子科技大学 | Dual-frequency broadband wide-angle circularly polarized grid based on miniaturized unit |
| CN112186362A (en) * | 2020-09-15 | 2021-01-05 | 重庆邮电大学 | Dual-frequency miniaturized frequency selective surface with complementary structure |
| CN112186362B (en) * | 2020-09-15 | 2022-07-01 | 重庆邮电大学 | Dual-frequency miniaturized frequency selective surface with complementary structure |
| CN112563757A (en) * | 2020-12-25 | 2021-03-26 | 安方高科电磁安全技术(北京)有限公司 | Frequency selective surface structure and third-order filter |
| CN112736481A (en) * | 2020-12-25 | 2021-04-30 | 南京航空航天大学 | Three-screen double-passband high-selectivity frequency selection surface and design method thereof |
| CN113258297A (en) * | 2021-05-27 | 2021-08-13 | 光谷技术有限公司 | Metamaterial filtering structure and gateway equipment |
| CN113394569A (en) * | 2021-06-30 | 2021-09-14 | 电子科技大学长三角研究院(湖州) | Low-profile dual-band wave-absorbing surface applied to vehicle-mounted radar test environment and manufacturing method thereof |
| CN113394569B (en) * | 2021-06-30 | 2022-10-18 | 电子科技大学长三角研究院(湖州) | Low-profile dual-band wave-absorbing surface applied to vehicle-mounted radar test environment and manufacturing method thereof |
| CN113851801A (en) * | 2021-11-03 | 2021-12-28 | 武汉灵动时代智能技术股份有限公司 | Bandwidth-stable frequency selective surface structure based on pole coupling and splitting |
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