CN1949587B - Quasi-elliptic filtering character frequency selecting surface - Google Patents
Quasi-elliptic filtering character frequency selecting surface Download PDFInfo
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- CN1949587B CN1949587B CN200610096794A CN200610096794A CN1949587B CN 1949587 B CN1949587 B CN 1949587B CN 200610096794 A CN200610096794 A CN 200610096794A CN 200610096794 A CN200610096794 A CN 200610096794A CN 1949587 B CN1949587 B CN 1949587B
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Abstract
The invention is a quasi-elliptic filter characteristic frequency selection surface, an ultrathin novel frequency selection surface with quasi-elliptic filter characteristic, based on substrate integrated waveguide cavity cascading technique, and the structure is made on a multilayer substrate formed by laminating three layers of microwave plates and having four metal surface layers and three medium layers, where the top and bottom metal surfaces are made with periodical square annular slots of the same size. And the intermediate metal surface is made with periodical square annualr slots of the other size which coincides the centers of the square annular slots on the top and bottom surfaces, three medium layers are filled in between the four metal surface layers, and a series of metalized through holes are arranged at regular intervals around each periodical square annular slot unit on the ready-laminated multilayer substrate so as to form a substrate integrated waveguide cavity equivalent to traditional metal cavity. As compared with common SMD or slot type multiscreen cascaded frequency selection surface, it first implements quasi-elliptic filter performance with high selectivity.
Description
Technical field
The present invention is that a kind of ultra-thin novel frequency with accurate oval filtering characteristic based on the substrate integrated wave-guide cavity wave concatenation technology is selected the surface, 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 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.And present various multi-screen cascade systems are owing to realizing cross-couplings, so also do not see the report of the frequency-selective surfaces of realizing oval or accurate oval filtering characteristic.
Summary of the invention
Technical problem: the purpose of this invention is to provide a kind of the realization first at home and abroad and have ultra-thin quasi-elliptic filtering character frequency selecting surface with monolithic integrated structure formation based on the substrate integrated wave-guide cavity wave concatenation technology, this frequency-selective surfaces selects performance greatly to improve at working frequency range, stability is good, thickness reduces greatly, be easy to processing, simple in structure, cost is low.This frequency-selective surfaces is compared with the frequency-selective surfaces of existing multilayer cascade and is selected performance greatly to improve, and volume reduces greatly.
Technical scheme: the high quality factor resonance of at first introducing cavity based on the quasi-elliptic filtering character frequency selecting surface of substrate integrated waveguide technology improves the frequency selective characteristic of FSS, strengthens its incident angle and the insensitivity of polarization and bandwidth stability under the various environment for driving source.Secondly it according to traditional cascade cavity body filter theoretical and multimode cavity fluid filter theory, the bimodulus resonance characteristic of utilization itself and sandwich construction obtain to realize ellipse or accurate oval filtering characteristic must cross-couplings.Structurally, the substrate of ultra-thin quasi-elliptic filtering character frequency selecting surface forms with the manufacturing of three layers of microwave sheet material lamination, and substrate comprises the metal covering and the middle double layer of metal face of upper and lower surface, is filled with three layers of dielectric layer of upper, middle and lower between these four layers of metal coverings; On the metal covering of upper and lower surface, carve measure-alike big square ring type clearance channel simultaneously, on middle double layer of metal face, carve the little square ring type clearance channel of another size that overlaps with the big square ring type clearance channel of upper and lower surface center; Last periodically the square ring type slot element is to be interval with a series of metal through holes uniformly around each on the good substrate of lamination, and formation is equivalent to the substrate integrated wave-guide cavity wave of conventional metals cavity.The etched big square ring type clearance channel of the metal covering of upper and lower surface is used for plane wave is coupled to cavity about fully symmetrical " " shape of length and width both direction slit; Be used for that electromagnetic wave with a cavity is coupled to another cavity and be about length and width both direction little " " shape slit of symmetry fully at the little square ring type clearance channel of middle double layer of metal surface etching.
Big square ring type clearance channel is when Ka frequency range centre frequency is 30GHz, and its length of side is 2.58 millimeters, and width is 0.24 millimeter, and the little square ring type clearance channel length of side on intermetallic metal surface is 1.39 millimeters, and width is 0.15 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 6 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.
This frequency-selective surfaces combines the transmission characteristic and the field distribution of traditional periodic structure and double mould cavity body structure.Cavity the inside is coupled to the plane wave in the certain frequency scope in the periodicity slit on surface during work, realizes in the same cavity cross-couplings of same pattern in two kinds of different modes and the different cavitys in cavity, has accurate oval filtering characteristic thereby form.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 ring type slit, through the cross-couplings of same pattern in different mode in the same cavity and the different cavitys, the slit of the ripple in the free transmission range by opposite side is coupled away after forming repeatedly filtering.The space plane ripple has finally been realized the high selectivity filtering to the space plane ripple through the double mode selectivity transmission of upper and lower surface slit and middle three cavitys.
Beneficial effect: the ultra-thin novel frequency option table face of the accurate oval filtering characteristic that forms based on substrate integrated waveguide technology has the following advantages:
It is that we utilize the frequency-selective surfaces of realizing having accurate oval filtering characteristic on the single chip integrated structure at home and abroad first that this novel frequency of a is selected the surface.Compare with frequency-selective surfaces in the past, select performance to improve greatly, volume reduces greatly, and thickness only be the sixth of the frequency-selective surfaces of traditional multi-screen plane cascade system formation.
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 utilizes the common upper and lower surface of multilayer to be covered with on the dielectric substrate of metal and just can realize.In design process, only need to regulate the shape and size in square ring type slit, 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 present invention.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, L be about the length of side in square ring type slit, metal surface, L
mBe the length of side in coupling square ring type slit on the middle double layer of metal face, W be about the width in square ring type slit, metal surface, W
mBe the width in coupling square ring type slit on the middle double layer of metal face, 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 present invention.
Fig. 3 is the perspective view of the local unit of a signal of the present invention.Have among the figure: the metal surface 1 up and down, middle double layer of metal face 2, big square ring type clearance channel 3, little square ring type clearance channel 4, middle dielectric layer 5, plated-through hole 6.
Fig. 4 is the overall structure schematic diagram that the present invention is applied to the Ka wave band.
Fig. 5 is the comparison of the present invention's emulation and test result when the plane wave vertical incidence. wherein (a) for electric field perpendicular to the Y-Z plane. wherein (b) for electric field perpendicular to the X-Z plane.
Fig. 6 is the test result of the present invention when the oblique incidence of TE polarization plane ripple.
Fig. 7 is the test result of the present invention when the oblique incidence of TM polarization plane ripple.
Embodiment
Quasi-elliptic filtering character frequency selecting surface uses three layers of microwave sheet material to be pressed into the multilayer board process layer.Its upper and lower surface and centre are two-layer to be metal covering, is made of medium charge in the middle of four layers of metal covering.Up and down be carved with the big positive square ring type slot element of the identical periodicity of position, size and Cycle Length on the metal surface, be carved with different on the middle double layer of metal face but center coincidence and the identical positive square ring type slot element of periodicity of Cycle Length with metal surface gap size up and down.On the substrate that four layers of metal covering and three layers of dielectric layer are pressed into, around each positive square ring type slot element 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 ring type slit, metal surface up and down be about symmetrical fully " " shape slit of length and width both direction.The upper and lower surface square ring type slit length of side is 2.58 millimeters when Ka frequency range centre frequency is 30GHz, and width is 0.24 millimeter, and square ring type slit, the intermediate layer length of side is 1.39 millimeters, and width is 0.15 millimeter.Sheet material is that dielectric constant is 2.2 Rogers5880 material, 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 invention is: at first choosing three dielectric substrates, the etching size square ring type clearance channel in corresponding outer surface and intermediate layer respectively on two metal coverings up and down of two substrates is all peeled another substrate two sides metal covering off therein.Then preceding two substrates are opened aspectant the setting of one side of corresponding intermediate layer size square ring type clearance channel, another dielectric substrate that does not have metal covering is inserted into their middle stacking then carries out lamination.Last each periodicity square ring type slot element that centers on the good substrate of lamination is beaten the substrate integrated wave-guide cavity wave that a series of metal through holes formation are equivalent to the conventional metals cavity with uniform interval.Select suitable aperture and pitch of holes, avoid produce power leakage between cavity.This frequency-selective surfaces combines the transmission characteristic and the field distribution of traditional periodic structure and double mould cavity body structure.Because single substrate thickness is much smaller than the broadside of the cavity of substrate integration wave-guide formation, so it is very little for the resonance affects of cavity, so select ultrathin substrate can reduce the size of whole frequency-selective surfaces greatly.Select the size in suitable coupling square ring type slit, intermediate layer, can regulate two cavity coupling amounts up and down, thereby form frequency-selective surfaces with accurate oval filtering characteristic.Whole frequency-selective surfaces is realized by common lamination 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 accurate ellipse 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:
Fig. 5 is its test result and and the contrast of simulation result to Fig. 7.
Claims (4)
1. quasi-elliptic filtering character frequency selecting surface, the substrate that it is characterized in that this frequency-selective surfaces is with three layers of microwave sheet material lamination, manufacturing forms, this frequency-selective surfaces comprises the metal covering (1) and the middle double layer of metal face (2) of upper and lower surface, is filled with three layers of microwave sheet material of upper, middle and lower dielectric layer (5) between these four layers of metal coverings; Go up at the metal covering (1) of upper and lower surface simultaneously and carve measure-alike big square ring type clearance channel (3), go up the little square ring type clearance channel (4) of carving another size that overlaps with the big square ring type clearance channel of upper and lower surface (3) center at middle double layer of metal face (2), form adjacent equal intervals and the square ring type slot element of periodic arrangement; The last square ring type slot element that centers on each periodic arrangement on the good multi layer substrate of lamination forms the substrate integrated wave-guide cavity wave that is equivalent to the conventional metals cavity to be interval with a series of metal through holes (6) uniformly.
2. quasi-elliptic filtering character frequency selecting surface according to claim 1, the etched big square ring type clearance channel of metal covering (1) (3) that it is characterized in that upper and lower surface is used for plane wave is coupled to cavity about fully symmetrical " " shape of length and width both direction slit; Be used for that electromagnetic wave with a cavity is coupled to another cavity and be about length and width both direction little " " shape slit of symmetry fully at the etched little square ring type clearance channel in middle double layer of metal surface (2) (4).
3. quasi-elliptic filtering character frequency selecting surface according to claim 1, it is characterized in that big square ring type clearance channel (3) is when Ka frequency range centre frequency is 30GHz, its length of side is 2.58 millimeters, width is 0.24 millimeter, little square ring type clearance channel (4) length of side on intermetallic metal surface is 1.39 millimeters, and width is 0.15 millimeter; The working medium substrate is that dielectric constant is 2.2 Rogers5880 material, and its thickness is 0.254 millimeter.
4. quasi-elliptic 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 of two adjacent metal through holes (6) is apart from being 0.6 millimeter between plated-through hole (6) array, and the ratio of plated-through hole (6) diameter and hole heart distance is greater than 0.5.
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| CN1949587B true CN1949587B (en) | 2010-05-12 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6208316B1 (en) * | 1995-10-02 | 2001-03-27 | Matra Marconi Space Uk Limited | Frequency selective surface devices for separating multiple frequencies |
| CN1825678A (en) * | 2006-03-21 | 2006-08-30 | 东南大学 | Frequency selecting surface based on substrate integrated waveguide technology |
| CN200965908Y (en) * | 2006-10-17 | 2007-10-24 | 东南大学 | Quasi-ellipse filter characteristic frequency selection surface |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6208316B1 (en) * | 1995-10-02 | 2001-03-27 | Matra Marconi Space Uk Limited | Frequency selective surface devices for separating multiple frequencies |
| CN1825678A (en) * | 2006-03-21 | 2006-08-30 | 东南大学 | Frequency selecting surface based on substrate integrated waveguide technology |
| CN200965908Y (en) * | 2006-10-17 | 2007-10-24 | 东南大学 | Quasi-ellipse filter characteristic frequency selection surface |
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Granted publication date: 20100512 Termination date: 20211017 |