CN200965906Y - Chebyshev filter characteristic frequency selection surface - Google Patents
Chebyshev filter characteristic frequency selection surface Download PDFInfo
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- CN200965906Y CN200965906Y CN 200620126092 CN200620126092U CN200965906Y CN 200965906 Y CN200965906 Y CN 200965906Y CN 200620126092 CN200620126092 CN 200620126092 CN 200620126092 U CN200620126092 U CN 200620126092U CN 200965906 Y CN200965906 Y CN 200965906Y
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Abstract
A Chebyshev filter characteristic frequency selective surface, which can be applied to the multi-frequency antenna of communication system, such as satellite and radar, as band multiplexer, consists of multilayer substrate of frequency selective surface compacted by two layer microwave plate. The multilayer substrate comprises metal surfaces (1) on the upper and lower surfaces, a middle-layer metal surface (2), and two upper and lower dielectric layers (5) are filled in the gap between the three-tier metal surfaces. On the two upper and lower metal surfaces (1) two big square ring slit grooves (3) with the same size are arranged; on the middle metal surface a small square ring slit groove (4) with smaller size are arranged with coincidence center as the big square ring slit grooves. A plurality of metal via holes (6) are positioned around the cyclical square ring slit unit with uniform space on the laminated substrate, which forms the substrate integrated waveguide cavity which is equivalent to traditional metal cavity. The structure has a stable band and select property for the angle of incident light and polarity changes.
Description
Technical field
The utility model is a kind of ultra-thin frequency-selective surfaces of the novel Chebyshev's of the having filtering characteristic based on the substrate integrated wave-guide cavity wave cascade, belongs to microwave technical field.
Background technology
Frequency-selective surfaces (FSS) is very extensive in engineering is used.FSS has good selectivity to electromagnetic transmission and reflection, presents the all-pass characteristic for the electromagnetic wave in its passband, and the electromagnetic wave in its stopband then is total reflection characteristic, has the space filtering function.In microwave regime, FSS can be used for the frequency range multiplexer of Telstar, utilizes many feeds to dispose and enlarges traffic capacity.Another main application is to make radome, is used for the shielding of Aero-Space radar antenna and stealthy.Can also make high performance waveguide filter as the integrated insert of monolithic.The main performance of FSS is a frequency selective characteristic, for incident direction and the sensitivity of polarization and the stability of bandwidth of driving source.Traditional FSS selectivity that is formed by periodic patches or gap array is relatively poor.In order to improve the frequency selective characteristic of FSS, in the world at present method in common obtains the better choice characteristic with multi-screen FSS cascade exactly.Be filled with the dielectric layer that uses as impedance transformer between the multilayer FSS of cascade, but thickness of dielectric layers is about 1/4th of working frequency range centre frequency corresponding wavelength, this makes that whole FSS structural thickness is very big, limits its use under a lot of practical application.
Summary of the invention
Technical problem: the purpose of this utility model provides a kind of formation based on the substrate integrated wave-guide cavity wave cascade and has ultra-thin Chebyshev filtering character frequency selecting surface, this frequency-selective surfaces is good in the working frequency range stability, and thickness reduces greatly, is easy to processing, simple in structure, cost is low.The frequency-selective surfaces of this frequency-selective surfaces and existing multilayer cascade specific volume is mutually reduced greatly, and stability is good.
Technical scheme: the high quality factor resonance of at first introducing cavity based on the Chebyshev filtering character frequency selecting surface of substrate integrated waveguide technology improves the frequency selective characteristic of FSS, strengthen its incident angle and the insensitivity of polarization and bandwidth stability under the various environment for driving source, next utilizes traditional cascade cavity body filter theory to design multi layer substrate integral waveguide cavity cascade FSS.Structurally, Chebyshev filtering character frequency selecting surface manufactures the multi layer substrate of frequency-selective surfaces with two-layer microwave sheet material lamination, this multi layer substrate comprises the metal covering and the metallic intermediate layer face of upper and lower surface, and the space between this three-layer metal face is filled with two layer medium layer up and down; Simultaneously on the metal covering of upper and lower surface, open measure-alike big square annulus groove, the little square annulus groove of another size that etching overlaps with the groove center position, big square annulus of upper and lower surface on the intermetallic metal face; Last periodically unit, square annulus is to be interval with a series of metal through holes uniformly around each on the good multi layer substrate of lamination, and formation is equivalent to the substrate integrated wave-guide cavity wave of conventional metals cavity., be used for plane wave is coupled to cavity about fully symmetrical " " shape of length and width both direction slit at the etched big square annulus of the metal covering of upper and lower surface groove; Be used for that electromagnetic wave with a cavity is coupled to another cavity and at the little square annulus of intermetallic metal facet etch groove about length and width both direction symmetry " " shape slit fully.The big square annulus groove of the metal covering of upper and lower surface is when Ka frequency range centre frequency is 30GHz, and the length of side is 3.12 millimeters, and width is 0.16 millimeter, and the little square annulus trough rim length of intermetallic metal face is 0.67 millimeter, and width is 0.06 millimeter; The working medium substrate is that dielectric constant is 2.2 Rogers5880 material, and its thickness is 0.254 millimeter.The diameter of plated-through hole is 0.4 millimeter, and the hole heart distance of two adjacent metal through holes is 0.6 millimeter between the plated-through hole array.
This frequency-selective surfaces has been introduced the cavity body structure that is formed by substrate integrated waveguide technology on the basis of traditional periodic structure, changed the distribution of field between traditional multi-screen cascade system, significantly reduce the thickness of middle filling medium layer, thereby reduced the volume of total greatly.Can be used as the frequency range multiplexer and be applied to the multifrequency antenna of communication systems such as satellite, radar, be used for stealth technology as radome, make the multiplexing secondary face of multiplex antenna in millimeter wave/infrared compound remote sensing technology, and the polarizer of optics and quasi-optical system and wave beam separator.
Operation principle is: after plane wave incides frequency-selective surfaces, the cavity the inside is coupled to the plane wave of working frequency range in periodic square annulus, by the coupling slit of intermediate metal layer electromagnetic wave is coupled to next cavity again, by slit on the opposite side surface electromagnetic wave is coupled to the space again.The space plane ripple has finally formed the high performance filtering to the space plane ripple of transmission through the selectivity transmission of upper and lower surface slit and middle two cavitys.
Beneficial effect: the frequency-selective surfaces of the Chebyshev's filtering characteristic that forms based on substrate integrated waveguide technology has the following advantages:
The Chebyshev filtering character frequency selecting surface that a this novel frequency selection surface and former studies design specific volume is mutually reduced greatly, stability is good, and thickness only is the sixth of the frequency-selective surfaces that forms of traditional multi-screen plane cascade system.
This novel frequency of b is selected surperficial stable performance, and is little in the insertion loss of working frequency range, the selectivity height.And its high selectivity and bandwidth stability do not change with the incident angle of incident wave and the variation of polarized state.
This novel frequency of c selects the surface simple in structure, and entire infrastructure is covered with in common upper and lower surface on the dielectric substrate of metal and just can realizes.In design process, only need to regulate the shape and size of square annulus, and the periodicity size of metal throuth hole just can obtain needed performance.Structural parameters are few, save the time of design optimization greatly.
It is simple and convenient that this novel frequency of d selects the surface to make, and just can realize with common lamination PCB technology, cheap.
Description of drawings
Fig. 1 is the structure vertical view of the local unit of a signal of the utility model.P is the Cycle Length and the width of one-period unit, and C is the length and the width of the substrate integrated wave-guide cavity wave that plated-through hole constitutes in the one-period unit, and L be the length of side of metal surface pros annulus up and down, L
mBe the length of side of the square annulus of coupling on the intermediate metal layer, W be the width of metal surface pros annulus up and down, W
mBe the width of the square annulus of coupling on the intermediate metal layer, d is a through-hole diameter, d
pBe the hole heart distance of adjacent two through holes, h is a thickness of dielectric layers, and mh is a metal layer thickness.
Fig. 2 is the structure side view of the local unit of a signal of the utility model.
Fig. 3 is the perspective view of the local unit of a signal of the utility model.Have among the figure: the metal surface 1 up and down, metallic intermediate layer face 2, unit, the square annulus of the periodicity of opening on the metal surface up and down 3, the square annular coupling of the periodicity of opening on metallic intermediate layer surface slot element 4, middle dielectric layer 5, plated-through hole 6.
Fig. 4 is the overall structure schematic diagram that the utility model is applied to the Ka wave band.
Fig. 5 is the comparison of the utility model emulation and test result when the plane wave vertical incidence.Wherein (a) is that electric field is perpendicular to the Y-Z plane.Wherein (b) is that electric field is perpendicular to the X-Z plane.
Fig. 6 is the test result of the utility model when the oblique incidence of TE polarization plane ripple.
Fig. 7 is the test result of the utility model when the oblique incidence of TM polarization plane ripple.
Embodiment
Chebyshev filtering character frequency selecting surface uses two-layer microwave sheet material to be pressed into the multilayer board process layer.Its upper and lower surface and intermediate layer are metal covering, are made of medium charge in the middle of the three-layer metal.
Up and down be carved with unit, the square annulus of the identical periodicity of position, size and Cycle Length on the metal surface, be carved with unit, periodicity pros annulus different with metal surface gap size up and down but that the center overlaps and Cycle Length is identical on the metallic intermediate layer face.On the substrate that three-layer metal face and two layer medium lamination are made, around each unit, square annulus with uniform interval around be provided with a series of metal through holes, formation is equivalent to the substrate integrated wave-guide cavity wave of the cascade up and down of conventional metals cavity.In etched square annulus, metal surface up and down be about symmetrical fully " " shape slit of length and width both direction.The big square annulus of the upper and lower surface length of side is 3.14 millimeters when Ka frequency range centre frequency is 30GHz, and width is 0.16 millimeter, and little square annulus, the intermediate layer length of side is 0.67 millimeter, and width is 0.06 millimeter.Sheet material is that dielectric constant is 2.2 Rogers5880, and its thickness of dielectric layers is 0.254 millimeter, and metal layer thickness is 0.018 millimeter.The diameter of plated-through hole is 0.4 millimeter, and the hole heart of two adjacent metal through holes is apart from being 0.6 millimeter between the plated-through hole array, and the ratio of plated-through hole diameter and hole heart distance is greater than 0.5.
Manufacture process of the present utility model is: at first choosing two dielectric substrates, the etching size square annulus in corresponding outer surface and intermediate layer respectively on two metal coverings up and down of a substrate therein, the metal covering of a side is opened the square annulus groove of size corresponding to outer surface on another substrate, and the metal covering of opposite side is all peeled off.Then first substrate is opened the one side of the square annulus of corresponding intermediate layer size groove and second substrate do not have metal level that this simultaneously stacks and carries out lamination.A series of metal through holes are beaten with uniform interval in last each periodically unit, square annulus that centers on the good substrate of lamination, form the substrate integrated wave-guide cavity wave that is equivalent to the conventional metals cavity.Select suitable aperture and pitch of holes, avoid produce power leakage between cavity.This frequency-selective surfaces has been introduced the field distribution characteristics that are equivalent to the metallic cavity structure on the basis of traditional periodic structure, effectively reduced the thickness of the dielectric layer of filling between the cascade metal flat.Select for use ultra-thin dielectric substrate can reduce the thickness of whole frequency-selective surfaces greatly.Select the be coupled size of square annulus of suitable intermediate layer, can regulate two cavity coupling amounts up and down, thereby form frequency-selective surfaces with Chebyshev's filtering characteristic.Whole frequency-selective surfaces is realized by common multi-layer PCB technology fully.Cavity body structure is realized by the plated-through hole array, makes simple, with low cost.
We have the ultra-thin frequency-selective surfaces of Chebyshev response, the relative dielectric constant ε of dielectric substrate what the Ka wave band had been realized above introduction based on substrate integrated waveguide technology
rAnd geometrical parameters (seeing Fig. 1,2,3) is as follows:
| P(mm) L(mm) W(mm) h(mm) d(mm) ε r | 6.0 3.14 0.16 0.254 0.4 2.2 | C(mm) L m(mm) W m(mm) m h(mm) d p(mm) | 6.0 0.67 0.06 0.018 0.6 |
Fig. 5 is its test result and and the contrast of simulation result to Fig. 7.
Claims (4)
1. Chebyshev filtering character frequency selecting surface, it is characterized in that manufacturing the multi layer substrate of frequency-selective surfaces with two-layer microwave sheet material lamination, this multi layer substrate comprises the metal covering (1) and the metallic intermediate layer face (2) of upper and lower surface, and the space between this three-layer metal face is filled with two layer medium layer (5) up and down; On the metal covering (1) of upper and lower surface, open simultaneously measure-alike big square annulus groove (3), the little square annulus groove (4) of another size that etching overlaps with big square annulus groove (3) center of upper and lower surface on intermetallic metal face (2); Last periodically unit, square annulus is to be interval with a series of metal through holes (6) uniformly around each on the good multi layer substrate of lamination, and formation is equivalent to the substrate integrated wave-guide cavity wave of conventional metals cavity.
2. Chebyshev filtering character frequency selecting surface according to claim 1, it is characterized in that the etched big square annulus groove of metal covering (1) (3) in upper and lower surface about complete symmetry " " shape slit of length and width both direction, is used for plane wave is coupled to cavity; Be used for that electromagnetic wave with a cavity is coupled to another cavity and at the etched little square annulus groove of intermetallic metal face (2) (4) about length and width both direction symmetry " " shape slit fully.
3. Chebyshev filtering character frequency selecting surface according to claim 1, the big square annulus groove (3) of metal covering (1) that it is characterized in that upper and lower surface is when Ka frequency range centre frequency is 30GHz, the length of side is 3.12 millimeters, width is 0.16 millimeter, little square annulus groove (4) length of side of intermetallic metal face (2) is 0.67 millimeter, and width is 0.06 millimeter; The working medium substrate is that dielectric constant is 2.2 Rogers5880 material, and its thickness is 0.254 millimeter.
4. Chebyshev filtering character frequency selecting surface according to claim 1, the diameter that it is characterized in that plated-through hole (6) is 0.4 millimeter, the hole heart distance of two adjacent metal through holes (6) is 0.6 millimeter between plated-through hole (6) array.
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| CN 200620126092 CN200965906Y (en) | 2006-10-17 | 2006-10-17 | Chebyshev filter characteristic frequency selection surface |
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| CN 200620126092 CN200965906Y (en) | 2006-10-17 | 2006-10-17 | Chebyshev filter characteristic frequency selection surface |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1949586B (en) * | 2006-10-17 | 2010-05-12 | 东南大学 | Chebyshev filtering character frequency selecting surface |
| CN104064840A (en) * | 2014-07-09 | 2014-09-24 | 南京师范大学 | Miniaturization band elimination type frequency selective surface |
| CN110829018A (en) * | 2019-11-15 | 2020-02-21 | 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 |
| CN110880632A (en) * | 2019-11-26 | 2020-03-13 | 电子科技大学 | Wide-bandwidth angular frequency selection surface based on substrate integrated waveguide cavity |
-
2006
- 2006-10-17 CN CN 200620126092 patent/CN200965906Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1949586B (en) * | 2006-10-17 | 2010-05-12 | 东南大学 | Chebyshev filtering character frequency selecting surface |
| CN104064840A (en) * | 2014-07-09 | 2014-09-24 | 南京师范大学 | Miniaturization band elimination type frequency selective surface |
| CN104064840B (en) * | 2014-07-09 | 2016-08-24 | 南京师范大学 | Miniaturization band resistance type frequency-selective surfaces |
| CN110829018A (en) * | 2019-11-15 | 2020-02-21 | 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 |
| CN110880632A (en) * | 2019-11-26 | 2020-03-13 | 电子科技大学 | Wide-bandwidth angular frequency selection surface based on substrate integrated waveguide cavity |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071024 Termination date: 20101017 |