CN103022602B - Intelligent space filter with on and off function - Google Patents
Intelligent space filter with on and off function Download PDFInfo
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- CN103022602B CN103022602B CN201210570546.1A CN201210570546A CN103022602B CN 103022602 B CN103022602 B CN 103022602B CN 201210570546 A CN201210570546 A CN 201210570546A CN 103022602 B CN103022602 B CN 103022602B
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Abstract
The invention relates to the technical field of microwaves and discloses an intelligent space filter with an on and off function. The intelligent space filter with the on and off function solves the problem that band-pass filtering characteristics cannot be changed as required in an existing FSS (frequency selective surface) application process. The filter comprises a double-layer frequency selective surface, a mixture interlayer composed of polymers and solid electrolyte, a lead, a voltage source and a switch, the double-layer frequency selective surface comprises a frequency selective surface substrate layer and a frequency selective surface metal layer which are in close contact; the mixture interlayer is arranged in the double-layer frequency selective surface, two sides of the mixture interlayer composed of the polymers and the solid electrolyte are respectively in close contact with the frequency selective surface metal layer, one end of the lead is connected with one end of the voltage source, the other end of the lead is connected with the frequency selective surface metal layer, the other end of the voltage source is connected with one end of the switch, and the other end of the switch is connected with the frequency selective surface metal layer. The filter is simple in structure and convenient to operate.
Description
Technical field
The present invention relates to microwave technical field, be specifically related to a kind of intelligent space filter with switching function.
Background technology
Frequency-selective surfaces (Frequency Selective Surface, FSS) be a kind of periodic array in two dimensions structure be made up of the perforate unit of periodic arrangement on the metal patch unit of periodic arrangement or metal screen, it can make electromagnetic wave, at resonance frequency place, total reflection or total transmissivity occur, and is therefore a kind of spatial filter wave frequency being had to selection index system.
FSS has a wide range of applications in microwave regime as spatial filter.As adopted FSS technology to prepare mixing radome, the outer RCS of band of flight weapons antenna can be reduced, thus realize radar invisible function; Utilize FSS filtering characteristic to prepare the dichroism subreflector of Cassegrain antenna, make the feed of two different frequencies share same reflecting surface, thus save space; Using the wall of FSS structure as building or the interlayer of door and window, the electromagnetic transmission of special frequency channel can be realized, and shield the interference signal of other frequency ranges.
But once prepared by product in above-mentioned application, the band-pass filtering property utilizing FSS to realize just cannot change.For mixing radome, when enemy's detection radar is identical with one's own side's guidance radar frequency range, lose stealthy function because this frequency range electromagnetic wave cannot be shielded; The dichroism subreflector of card match Glenn system cannot select feed according to demand; And shielded enclosure can not realize full frequency band shielding according to actual needs.This limitation makes FSS be difficult to practical requirement in the application as spatial filter.
Summary of the invention
The present invention, for solving in existing application FSS process, cannot change the problem of band-pass filtering property as required.A kind of intelligent space filter with switching function is provided.
Have an intelligent space filter for switching function, this filter comprises mixture interlayer, wire, voltage source and the switch that double-layer frequency selective surfaces, polymer and solid electrolyte form; Each frequency-selective surfaces of described double-layer frequency selective surfaces comprises frequency-selective surfaces basalis and frequency-selective surfaces metal level; Described frequency-selective surfaces metal level and frequency-selective surfaces basalis close contact; Mixture interlayer is set in described double-layer frequency selective surfaces; The both sides of the mixture interlayer that described polymer and solid electrolyte form respectively with frequency-selective surfaces metal level close contact, one end of described wire is connected with one end of voltage source, the other end of wire is connected with in double-layer frequency selective surfaces frequency-selective surfaces metal level, the other end of voltage source is connected with one end of switch, and the other end of switch is connected with another frequency-selective surfaces metal level in double-layer frequency selective surfaces.
Operation principle of the present invention: intelligent space filter of the present invention, using the metal level of two-layer frequency-selective surfaces as the positive and negative electrode of intermediate course, different voltage is applied from the mixture dielectric interlayer that solid electrolyte forms by the Switch Controller polymer in control voltage source, make mixture interlayer realize inverible transform in insulator and conductor two states, and then reach the switching function of filter.When the metal level of voltage source and frequency-selective surfaces disconnects, the mixture dielectric interlayer both sides that polymer and solid electrolyte form, without electric field action, present state of insulation, and the filter table of this structure reveals the filtering characteristic of high q-factor; When voltage source is communicated with the metal level of frequency-selective surfaces, the mixture dielectric interlayer that polymer and solid electrolyte form is rendered as conductive state under the effect of electric field, can shield electromagnetic wave, makes this filter no longer have filtering characteristic.Whether be communicated with the metal level of frequency-selective surfaces by control voltage source, achieve the switching function of this spatial filter.
Beneficial effect of the present invention: the invention provides a kind of intelligent space filter with switching function, the function of passband filtering or full frequency band shielding can be realized according to the actual requirements, improve frequency-selective surfaces as the practical application of spatial filter and reliability, and structure is simple, easy to operate.
Accompanying drawing explanation
Fig. 1 is a kind of intelligent space filter structural representation with switching function of the present invention.
Fig. 2 is that a kind of intelligent space filter with switching function of the present invention aligns incoming electromagnetic wave transfer characteristic comparison diagram under Kai Heguan two states.
In figure: 1, frequency-selective surfaces basalis, 2, frequency-selective surfaces metal level, 3, mixture interlayer, 4, switch, 5, wire, 6, voltage source.
Embodiment
Composition graphs 1 and Fig. 2 illustrate present embodiment, and a kind of intelligent space filter with switching function, comprises frequency-selective surfaces basalis 1, frequency-selective surfaces metal level 2, the mixture interlayer 3 that polymer and solid electrolyte form, switch 4, wire 5 and voltage source 6; Frequency-selective surfaces metal level 2 close contact of mixture interlayer 3 and both sides, frequency-selective surfaces metal level 2 and frequency-selective surfaces basalis 1 close contact; Whether voltage source 6 is connected with the metallic member of frequency-selective surfaces metal level 2 by wire 5, be communicated with by switch 4 control voltage source 6 with frequency-selective surfaces metal level 2.
The concrete preparation process of the mixture interlayer 3 that the polymer described in present embodiment and solid electrolyte form is as follows: the composite material adopting any one polymer in polyaniline (PANi), polypyrrole (PPy) and Polyglycolic acid fibre (PEDOT) and certain solid electrolyte to form is as the intermediate course of double-layer frequency selective surfaces:
Polymer selects Polyglycolic acid fibre (PEDOT), and solid electrolyte selects polyethylene glycol oxide (PEO), cupric fluoborate (Cu (BF
4)
2), lithium fluoroborate (LiBF
4) and copper particulate, in above material, PEDOT mass fraction is 19%, PEO mass fraction is 54%, Cu (BF
4)
2mass fraction is 1.5%, LiBF
4mass fraction is 11.5%, and copper particle mass mark is 14%, and copper particle size is less than 10 μm; Said mixture is put into acetonitrile solvent uniform stirring after five hours, solvent to be evaporated, and mixture is dried; Use pressure roller that the mixture of polymer and solid electrolyte is prepared into interlayer 3, its thickness is 3mm, and relative dielectric constant is 7.5, and loss tangent value is 0.01.
Frequency-selective surfaces basalis 1 described in present embodiment selects polyimide film, and its thickness is 25 μm, and relative dielectric constant is 3.0, and loss tangent value is 0.005; Carry out the graphic designs of frequency-selective surfaces according to the requirement of above parameter and center frequency point, adopt plated film and photoetching process on polyimide film, prepare frequency-selective surfaces metal level 2; Wire 5 selects metallic copper to prepare, and one end is connected with frequency-selective surfaces metal level 2, and the other end is connected with voltage source 6, and voltage source voltage is ± 5V, and frequency is 0.05Hz, by being communicated with of switch 4 control voltage source and frequency-selective surfaces metal level 2.
Composition graphs 2 illustrates present embodiment, and when switch 4 is opened, mixture interlayer 3 both sides do not have voltage, show as insulator, and this filter has good filtering characteristic; When switch 4 cuts out, mixture interlayer 3 both sides are loaded with voltage, and mixture has conductivity, and this filter can realize the electromagnetic shielding characteristic of wide-band.
In the present embodiment, the surface of frequency-selective surfaces metal level 2 can be arbitrary figure, as cross hole shape, Roundabout, Y hole shape, Y annular, circle hole shape and annular etc.
Claims (4)
1. have an intelligent space filter for switching function, this filter comprises mixture interlayer (3), wire (5), voltage source (6) and the switch (4) that double-layer frequency selective surfaces, polymer and solid electrolyte form; It is characterized in that, each frequency-selective surfaces of described double-layer frequency selective surfaces comprises frequency-selective surfaces basalis (1) and frequency-selective surfaces metal level (2); Described frequency-selective surfaces metal level (2) and frequency-selective surfaces basalis (1) close contact; Mixture interlayer (3) is set in described double-layer frequency selective surfaces; The both sides of the mixture interlayer (3) that described polymer and solid electrolyte form respectively with frequency-selective surfaces metal level (2) close contact, one end of described wire (5) is connected with one end of voltage source (6), the other end of wire (5) is connected with the frequency-selective surfaces metal level (2) of in double-layer frequency selective surfaces, the other end of voltage source (6) is connected with one end of switch (4), and the other end of switch (4) is connected with another frequency-selective surfaces metal level (2) in double-layer frequency selective surfaces.
2. a kind of intelligent space filter with switching function according to claim 1, it is characterized in that, the polymer in the mixture interlayer (3) that described polymer and solid electrolyte form is any one in polyaniline, polypyrrole or Polyglycolic acid fibre; Solid electrolyte is the mixture of polyethylene glycol oxide, cupric fluoborate, lithium fluoroborate and copper particulate.
3. a kind of intelligent space filter with switching function according to claim 2, it is characterized in that, the manufacturing process of described mixture interlayer (3) is specially: described polymer selects Polyglycolic acid fibre, solid electrolyte selects polyethylene glycol oxide, cupric fluoborate, lithium fluoroborate and copper particulate, the mass fraction of described Polyglycolic acid fibre is 19%, the mass fraction of polyethylene glycol oxide is 54%, the mass fraction of cupric fluoborate is 1.5%, the mass fraction of lithium fluoroborate is 11.5%, copper particle mass mark is 14%, by described Polyglycolic acid fibre, polyethylene glycol oxide, cupric fluoborate, the mixture of lithium fluoroborate and copper particulate is put into acetonitrile solvent uniform stirring and is evaporated by solvent after five hours, and mixture is dried, pressure roller is adopted mixture to be prepared into mixture interlayer (3).
4. a kind of intelligent space filter with switching function according to claim 3, is characterized in that, the size of described copper particulate is less than 10 μm.
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| CN201210570546.1A CN103022602B (en) | 2012-12-25 | 2012-12-25 | Intelligent space filter with on and off function |
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| CN201210570546.1A CN103022602B (en) | 2012-12-25 | 2012-12-25 | Intelligent space filter with on and off function |
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| CN103022602B true CN103022602B (en) | 2014-12-24 |
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| CN104167576B (en) * | 2014-08-27 | 2016-07-06 | 中国舰船研究设计中心 | A kind of big bandwidth small size periodic unit frequency-selective surfaces structure |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1688590A (en) * | 2002-08-09 | 2005-10-26 | 能源变换设备有限公司 | Photonic crystals and devices having tunability and switchability |
| US7190325B2 (en) * | 2004-02-18 | 2007-03-13 | Delphi Technologies, Inc. | Dynamic frequency selective surfaces |
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2012
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1688590A (en) * | 2002-08-09 | 2005-10-26 | 能源变换设备有限公司 | Photonic crystals and devices having tunability and switchability |
| US7190325B2 (en) * | 2004-02-18 | 2007-03-13 | Delphi Technologies, Inc. | Dynamic frequency selective surfaces |
Non-Patent Citations (1)
| Title |
|---|
| "A Reconfigurable Beam-Switching Antenna Base on Active FSS";Yueh-Lin Tsai 等;《Antenna Technology and Applied Electromagnetics(ANTEM),2012 15th International Symposium on》;20120628;1-4页 * |
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