CN103490125A - Multi-layer complementary structure terahertz band-pass filter based on frequency selective surface - Google Patents
Multi-layer complementary structure terahertz band-pass filter based on frequency selective surface Download PDFInfo
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- CN103490125A CN103490125A CN201310475925.7A CN201310475925A CN103490125A CN 103490125 A CN103490125 A CN 103490125A CN 201310475925 A CN201310475925 A CN 201310475925A CN 103490125 A CN103490125 A CN 103490125A
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Abstract
The invention provides a multi-layer complementary structure terahertz band-pass filter based on a frequency selective surface, and belongs to the technical field of electromagnetic wave transmission function devices. The filter comprises an underlay dielectric substrate and two frequency selective surface layers which are arranged on upper and lower surfaces of the underlay dielectric substrate; the two frequency selective surface layers are arranged oppositely with the same structure; each frequency selective surface layer comprises N*N resonance units arranged in a matrix, and N is more than or equal to 30. The filter is high in Q value, small in insert loss, flat in passband ripple, remarkable in out-of-band rejection, simple in structure and small in size, and is convenient to adjust and control and easy to process.
Description
Technical field
The invention belongs to electromagnetic transmission function element technical field, particularly the Terahertz band pass filter.
Background technology
Terahertz (THz) ripple typically refers to the electromagnetic wave of frequency range in 0.1THz～10THz, between millimeter wave and infrared light, the characteristic that simultaneously there is microwave and infrared light, be characterized in that beamwidth is moderate, system bandwidth is larger, extremely be conducive to target acquisition imaging, High rate and large capacity communication.
Artificial electromagnetic material (Electromagnetic metamaterial) or composite material (composite material) can be broken through the dielectric constant of the existing material of nature and the restriction that magnetic permeability changes the degree of freedom, aspect the regulation and control electromagnetic wave, are showing huge application potential.Artificial electromagnetic material be by two or more traditional medium material (as metal and medium) design certain artificial structure unit, periodicity or acyclic combining, formation can freely regulate and control the artificial super material of electromagnetic transmission character.Frequency-selective surfaces (FSS-Frequency Selective Surfaces) is the hot research field in artificial electromagnetic material, a kind of can, to the two-dimension periodic array structure of electromagnetic different resonance frequencys, incidence angle, polarization mode generation total reflection or total transmissivity, with the electromagnetic wave phase mutual effect, showing obvious band logical (type unit, aperture) or be with the filtering characteristic of resistance (patch-type unit).Because FSS has the selection permeability to electromagnetic wave, the fields such as the RCS that can be widely used in radome reduces, spatial filter, polarizer, absorbing material modification.
Filter is passive device very important in microwave circuit and system, but, along with the further shortening of wavelength, the conventional waveguide mode filter is difficult to meet the actual demand of terahertz wave band.FSS realizes that the terahertz wave band band pass filter is mainly that ((Split ring resonances) two kinds of periodic resonance versions realize filtering by CELCs (Complementary Electric – LC Structure) and SRRs.In April, 2011, the people such as Mingzhi Lu of the U.S. provided the second-order bandpass filter of the complementary ELC resonance structure of a kind of 250GHz in the literature.This filter has the characteristics of second order bandpass filtering, and the Q value is higher, and band is outer precipitous.But insertion loss is larger, inband flatness is poor.
Summary of the invention
Technical problem to be solved by this invention is, provides that a kind of Q value is high, insertion loss is little, ripple is smooth in band, Out-of-band rejection is obvious, simple in structure, size is little, regulation and control are convenient, be easy to a kind of Terahertz bandpass filter based on frequency-selective surfaces of processing.
The technical scheme that the present invention solve the technical problem employing is, multilayer complementary structure Terahertz band pass filter based on frequency-selective surfaces, it is characterized in that, comprise substrate dielectric substrate and two frequency-selective surfaces layers that are arranged at substrate dielectric substrate upper and lower surface; Two frequency-selective surfaces layers are oppositely arranged, and structure is identical; Each frequency-selective surfaces layer comprises the resonant element that N * N matrix is arranged; N >=30.
Described resonant element is formed by the square-shaped metal sheet of middle hollow out, and the hollow out zone is circular; At vacancy section, along the sheet metal diagonal, every 90 degree, by annular of support arm cross-over connection, load.
Further, 4 support arms and annular are loaded as the Central Symmetry setting, and the center of circle in symmetrical centre and hollow out zone overlaps, also with the center superposition of sheet metal.
Described substrate dielectric substrate material adopts the single crystal quartz crystal that crystal orientation is 0001, and dielectric constant is 4.41, and magnetic permeability is 1, and loss tangent is 0.0004, and thickness is d, and d is hundred micron dimensions.
The length of side of square-shaped metal sheet is a, and the radius of middle circular hollow out is r
1, a and r
1be hundred micron dimensions.
The length of each support arm is w
1, width is s, w
1with s be ten micron dimensions.
The interior outer radius that annular by the support arm cross-over connection loads is respectively r
2and r
3, annular is carried in along square metal frame centerline direction and disconnects, and A/F is w
2, r
2, r
3and w
2be ten micron dimensions.
The wire member of metal resonance structure is Au, Ag, Cu, Al or Ti/Pt/Au alloy, and thickness h is hundred nanometer scale.
The present invention utilizes four support arm annulars to load the CELCs resonance structure first, and insertion loss is little, and in band, ripple is smooth, and Out-of-band rejection is obvious.Specifically, there is following advantage:
1) the present invention utilizes the processing of minute manufacturing technology, with respect to structures such as utilizing surface plasma, electrooptic crystal, realizes terahertz filter, and the present invention is simple in structure, volume is little, be easy to processing, controllable precision is high, cost is lower;
2) the present invention improves coupling effect and the resonance effect between unit by the adjustment to resonant element key structure parameter and substrate thickness, loss, raising inband flatness in the squareness factor that can realize ideal, reduction band;
3) the present invention can be at microwave the free transmission range to flexible work in the Terahertz frequency range, realize the even more bandpass filtering of high-order of second order, three rank.The present invention has important using value to the development of Terahertz transfer function device and detection means.
The accompanying drawing explanation
The three-dimensional structure schematic diagram that Fig. 1 is the multilayer complementary structure Terahertz band pass filter based on frequency-selective surfaces provided by the invention;
The single resonant element structural representation that Fig. 2 is frequency-selective surfaces;
The equivalent circuit diagram of the single resonant element that Fig. 3 is frequency-selective surfaces;
Emulation and resolution chart that Fig. 4 is the multilayer complementary structure Terahertz band pass filter transmission coefficient curve based on frequency-selective surfaces.
Embodiment
The invention provides a kind of four support arm annulars based on frequency-selective surfaces and load complementary ELC Terahertz band pass filter, as shown in Figure 1, 2, two the frequency- selective surfaces layers 3,4 that comprise signal input part 1, substrate dielectric substrate 5, substrate dielectric substrate upper and lower surface, and signal output part 2.
Two frequency-selective surfaces layers are positioned at the both side surface of substrate dielectric substrate 5, each frequency-selective surfaces layer consists of the resonant element of periodicity square arrangement, the periodicity resonance structure has N * N continuously apart from the four support arms annular loading CELCs unit (being resonant element) of arranging, and N >=30; The resonant element arrangement architecture of two frequency-selective surfaces layers is identical with shape and structure.
Resonant element comprises the square metal frame of a circular hollow out in centre, and the length of side of square metal frame is a, and the radius of middle circular hollow out is r
1; On the metal edge frame diagonal of middle hollow out, every 90 degree, by annular of support arm cross-over connection, load, the length of four support arms on the square metal frame is w
1, width is s; The interior outer radius that annular by the support arm cross-over connection loads is respectively r
2and r
3, and r
2=r
1-w
1; Annular is carried in along square metal frame centerline direction and disconnects, and A/F is w
2, and w
2=w
1;
Described substrate dielectric substrate material adopts the single crystal quartz crystal that crystal orientation is 0001, and dielectric constant is about 4.41, and magnetic permeability is 1, and loss tangent is about 0.0004, and thickness is d; It is 3.72 * 10 that the wire member of described metal resonance structure adopts conductivity
7s/m, thickness is the h metallic aluminium.
The structural parameters of resonant element are as shown in Figure 2: N=40, d=155 μ m, h=200nm, a=350 μ m, w
1=w
2=35 μ m, s=35 μ m r
1=112 μ m, r
1=77 μ m, r
3=60 μ m.
Figure 4 shows that in emulation and the resolution chart of the Terahertz band pass filter transmission coefficient curve of frequency-selective surfaces.The four support arm annulars based on frequency-selective surfaces load complementary ELC Terahertz band pass filter and obtain through the HFSS of high-frequency electromagnetic simulation software simulation: when frequency is 0.305THz, loss is-1.27dB that three dB bandwidth is 33.1GHz; Adopt the terahertz time-domain spectroscopy instrument repeatedly to survey the complementary ELC Terahertz band pass filter of four support arm annular loadings of preparation, by obtaining after fast fourier transform: when frequency is 0.306THz, loss is-1.99dB, the band internal loss is less than 1dB, be about-50dB of Out-of-band rejection, bandwidth is about 12GHz.The design error of crest frequency and transmission coefficient is 0.32% and 7.93%, and bandwidth error is larger, and main cause is dielectric constant, the conductance of metal material, the substrate thickness of base material, and the error that the measuring equipment precision is brought causes.
Four support arm annular loading cycle structures in this case, can adopt different processing technologys to be processed according to the difference of working frequency range, such as PCB technology, MEMS technology.
Claims (5)
1. the multilayer complementary structure Terahertz band pass filter based on frequency-selective surfaces, is characterized in that, comprises substrate dielectric substrate (5) and be arranged at two frequency-selective surfaces layers of substrate dielectric substrate (5) upper and lower surface; Two frequency-selective surfaces layers are oppositely arranged, and structure is identical; Each frequency-selective surfaces layer comprises the resonant element that N * N matrix is arranged, N >=30;
Described resonant element is formed by the square-shaped metal sheet of middle hollow out, and the hollow out zone is circular; At vacancy section, along the sheet metal diagonal, every 90 degree, by annular of support arm cross-over connection, load.
2. the multilayer complementary structure Terahertz band pass filter based on frequency-selective surfaces as claimed in claim 1, it is characterized in that, 4 support arms and annular are loaded as the Central Symmetry setting, and the center of circle in symmetrical centre and hollow out zone overlaps, also with the center superposition of sheet metal.
3. the multilayer complementary structure Terahertz band pass filter based on frequency-selective surfaces as claimed in claim 1, it is characterized in that, described substrate dielectric substrate material adopts the single crystal quartz crystal that crystal orientation is 0001, and dielectric constant is 4.41, magnetic permeability is 1, and loss tangent is 0.0004.
4. the multilayer complementary structure Terahertz band pass filter based on frequency-selective surfaces as claimed in claim 1, is characterized in that, annular is carried in along square metal frame centerline direction and disconnects.
5. the multilayer complementary structure Terahertz band pass filter based on frequency-selective surfaces as claimed in claim 1, is characterized in that, the wire member of described metal resonance structure is Au, Ag, Cu, Al or Ti/Pt/Au alloy.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106058394A (en) * | 2016-08-11 | 2016-10-26 | 中国矿业大学 | Terahertz three-wave-band narrow-band band-pass filter based on metamaterial |
| CN106887657A (en) * | 2017-03-10 | 2017-06-23 | 中国矿业大学 | A kind of mechanically tunable narrow band filter based on Meta Materials |
| WO2017152544A1 (en) * | 2016-03-07 | 2017-09-14 | 中兴通讯股份有限公司 | Frequency selective surface structure unit and frequency selective surface structure |
| 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 |
| CN105896098B (en) * | 2016-04-25 | 2019-03-01 | 中国工程物理研究院激光聚变研究中心 | A kind of broadband Terahertz meta-material absorber absorbing superposition based on multi-resonant |
| WO2019153449A1 (en) * | 2018-02-08 | 2019-08-15 | 深圳市太赫兹科技创新研究院 | Metamaterial-based band-pass filter unit and band-pass filter |
| WO2019153456A1 (en) * | 2018-02-11 | 2019-08-15 | 深圳市太赫兹科技创新研究院有限公司 | Terahertz band-pass filter |
| CN110571501A (en) * | 2019-09-16 | 2019-12-13 | 深圳先进技术研究院 | Terahertz filter based on super surface and manufacturing method thereof |
| CN110676592A (en) * | 2019-11-04 | 2020-01-10 | 淮安信息职业技术学院 | Dual-polarized three-order band-pass three-dimensional frequency selection surface |
| CN110783712A (en) * | 2019-10-27 | 2020-02-11 | 山西大学 | Ultra-wideband strong electromagnetic field protection device |
| CN112039603A (en) * | 2019-06-03 | 2020-12-04 | 桂林电子科技大学 | Secret transmission system, method and chip |
| CN112186314A (en) * | 2020-09-18 | 2021-01-05 | 上海师范大学 | Broadband band-pass filter for sixth-generation mobile communication and resonance module thereof |
| CN114200566A (en) * | 2021-12-14 | 2022-03-18 | 安徽中科光栅科技有限公司 | Near-infrared band-pass filter with series structure and design method |
| CN112039603B (en) * | 2019-06-03 | 2024-05-28 | 桂林电子科技大学 | Secret transmission system, method and chip |
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Cited By (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017152544A1 (en) * | 2016-03-07 | 2017-09-14 | 中兴通讯股份有限公司 | Frequency selective surface structure unit and frequency selective surface structure |
| CN105896098B (en) * | 2016-04-25 | 2019-03-01 | 中国工程物理研究院激光聚变研究中心 | A kind of broadband Terahertz meta-material absorber absorbing superposition based on multi-resonant |
| CN106058394A (en) * | 2016-08-11 | 2016-10-26 | 中国矿业大学 | Terahertz three-wave-band narrow-band band-pass filter based on metamaterial |
| CN106058394B (en) * | 2016-08-11 | 2018-11-16 | 中国矿业大学 | A kind of three wave band narrow band filter of Terahertz based on metamaterial |
| CN106887657B (en) * | 2017-03-10 | 2019-09-20 | 中国矿业大学 | A kind of mechanically tunable narrow band filter of the microwave section based on Meta Materials |
| CN106887657A (en) * | 2017-03-10 | 2017-06-23 | 中国矿业大学 | A kind of mechanically tunable narrow band filter based on Meta Materials |
| WO2019153449A1 (en) * | 2018-02-08 | 2019-08-15 | 深圳市太赫兹科技创新研究院 | Metamaterial-based band-pass filter unit and band-pass filter |
| WO2019153456A1 (en) * | 2018-02-11 | 2019-08-15 | 深圳市太赫兹科技创新研究院有限公司 | Terahertz band-pass filter |
| 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 |
| CN112039603B (en) * | 2019-06-03 | 2024-05-28 | 桂林电子科技大学 | Secret transmission system, method and chip |
| CN112039603A (en) * | 2019-06-03 | 2020-12-04 | 桂林电子科技大学 | Secret transmission system, method and chip |
| CN110571501A (en) * | 2019-09-16 | 2019-12-13 | 深圳先进技术研究院 | Terahertz filter based on super surface and manufacturing method thereof |
| CN110783712A (en) * | 2019-10-27 | 2020-02-11 | 山西大学 | Ultra-wideband strong electromagnetic field protection device |
| CN110783712B (en) * | 2019-10-27 | 2020-11-06 | 山西大学 | Ultra-wideband strong electromagnetic field protection device |
| CN110676592A (en) * | 2019-11-04 | 2020-01-10 | 淮安信息职业技术学院 | Dual-polarized three-order band-pass three-dimensional frequency selection surface |
| CN110676592B (en) * | 2019-11-04 | 2021-06-29 | 淮安信息职业技术学院 | Dual-polarized three-order band-pass three-dimensional frequency selection surface |
| CN112186314B (en) * | 2020-09-18 | 2021-08-03 | 上海师范大学 | Broadband band-pass filter for sixth-generation mobile communication and resonance module thereof |
| CN112186314A (en) * | 2020-09-18 | 2021-01-05 | 上海师范大学 | Broadband band-pass filter for sixth-generation mobile communication and resonance module thereof |
| CN114200566A (en) * | 2021-12-14 | 2022-03-18 | 安徽中科光栅科技有限公司 | Near-infrared band-pass filter with series structure and design method |
| CN114200566B (en) * | 2021-12-14 | 2024-03-15 | 安徽中科光栅科技有限公司 | Near infrared band-pass filter with series structure and design method |
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