CN102664314A - Zero-refraction microwave lens based on electromagnetic double resonance structure - Google Patents
Zero-refraction microwave lens based on electromagnetic double resonance structure Download PDFInfo
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- CN102664314A CN102664314A CN2012101656644A CN201210165664A CN102664314A CN 102664314 A CN102664314 A CN 102664314A CN 2012101656644 A CN2012101656644 A CN 2012101656644A CN 201210165664 A CN201210165664 A CN 201210165664A CN 102664314 A CN102664314 A CN 102664314A
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Abstract
Enclosed is a zero-refraction microwave lens based on an electromagnetic double resonance structure. The zero-refraction microwave lens based on the electromagnetic double resonance structure is used for solving a problem of poor improvement effect of the existing zero-refraction lens with anisotropy to the antenna gain. N+1 secondary strip-type dielectric substrates and N primary strip-type dielectric substrates are alternately arranged in a mutually parallel manner at distances of d 1, d 2, d 1, d 2......d2. The primary strip-type dielectric substrates are etchingly made of the strip-type dielectric substrates with both sides coated with copper. A plurality of split ring resonators SRR with square openings are etched on both surfaces of each strip-type dielectric substrate and arranged along the longitudinal direction of each strip-type dielectric substrate. The shapes of the split ring resonators SRR with the square openings on one surface of each strip-type dielectric substrate are formed by rotating the split ring resonators SRR with the square openings on the other surface of each strip-type dielectric substrate around the center of the strip-type dielectric substrate. The secondary strip-type dielectric substrates 2 are etchingly made of the strip-type dielectric substrates with single sides coated with copper. The zero-refraction microwave lens based on the electromagnetic double resonance structure is used for assisting to increase the antenna gain.
Description
Technical field
The present invention relates to a kind of zero refraction microwave lens, particularly a kind of zero refraction microwave lens based on electromagnetism double resonance structure.
Background technology
Supernormal medium (Metamaterial) is with elementary cell periodicity or the resulting novel artificial material of acyclic arrangement with geometry in particular.Through changing the structure and the parameter of elementary cell, can freely control the electromagnetic attributes of supernormal medium, i.e. its dielectric constant and magnetic permeability.Present supernormal medium dielectric constant and magnetic permeability can just can be born and also can be zero, and the two can jack per line, but also contrary sign.Therefore, be zero supernormal medium as if constructing dielectric constant or magnetic permeability, then the refractive index of this supernormal medium can be zero, i.e. zero refractive material (ZIM or Zero Refractive Index Metamaterial).2002; S.Enoch etc. point out that zero refractive material has the function that converges electromagnetic beam; Therefore can be used for making microwave lens, be used to improve directionality (S.Enoch, the et al.A metamaterial for directive emission.Physical Review Letters of aerial radiation; 2002,89:213902).Based on people's such as S.Enoch result of study, people have designed multiple zero refraction microwave lens (following abbreviation zero refractor) and zero refractor antenna very soon.Yet existing zero refractor is just realized zero refractive index through simple zero dielectric constant (electric resonance) or simple zero magnetic permeability (magnetic resonance), and they do not match with the impedance of air layer, if the direct radiation efficiency of the remarkable reduction of use meeting antenna.So the existing overwhelming majority zero refractor can only be to be placed on horn antenna actinal surface inner (Q.Wu, at al.A novel flat lens horn antenna designed based on zero refraction principle of metamaterials; Applied Physics, 2007, A87; 151-156); Or by metallic reflection plate (such as the floor of microstrip antenna) (Dongho Kim, at al.Analysis of Antenna Gain Enhancement with a New Planar Metamaterial Superstrate:an Effective Medium and a Fabry-P é rot Resonance Approach, the J Infrared Milli Terahz Waves at antenna rear; 2010; 31:1289-1303), the inside (Cheng Q, the at al.Radiation of planar electromagnetic waves by a line source in anisotropic MTMs that or directly antenna are embedded into zero refractor; Journal of Physics D-Applied Physics; 2010,43 (33): 335406.), need carry out structure optimization respectively to different antennas simultaneously; Could finally play the effect that improves antenna gain (antenna gain is the actual performance index of antenna, and the radiation directionality coefficient that it equals antenna multiply by the efficient of antenna).This makes that existing zero refractor is very fastidious to using environment, and does not often have versatility for different antennas, therefore is inconvenient to use very much.Though; People such as Ma proposed to utilize anisotropic zero refraction materials to improve the impedance matching property of zero refractor and air in 2009; Thereby make zero refractor can separate (just can make zero refractor have certain versatility like this) (Ma YG with antenna for different antennas; Et al.Near-field plane-wave-like beam emitting antenna fabricated by anisotropic metamaterial, Applied Physics Letters, 2009; 94 (4): 044107.) still from present result of practical application; This anisotropy zero refractor is very limited to the raising effect of antenna gain, even not enough 1dB (referring among on May 13rd, the 2011 disclosed patent publication CN102280703, Fig. 9 of Figure of description).
Summary of the invention
The present invention seeks to have proposed zero refraction microwave lens based on electromagnetism double resonance structure in order to solve the present anisotropy zero refractor problem low to the raising effect of antenna gain.
Zero refraction microwave lens based on electromagnetism double resonance structure of the present invention; It comprises N the first bar shaped medium substrate and N+1 the second bar shaped medium substrate; N+1 the second bar shaped medium substrate is alternate with the individual first bar shaped medium substrate of N and be arranged parallel to each other, and the first bar shaped medium substrate is identical with the profile of the second bar shaped medium substrate;
Distance between individual first bar shaped medium substrate of adjacent N and the individual second bar shaped medium substrate of N+1 is respectively d1, d2, d1, d2 ... D2;
The first bar shaped medium substrate is that the bar shaped medium substrate etching by double-sided copper-clad forms; Wherein one side goes up the square aperture resonant ring SRR that etching has a plurality of transverse openings of arranging by the length direction of this bar shaped medium substrate, and etching has the square aperture resonant ring SRR of a plurality of vertical openings of arranging by the length direction of this bar shaped medium substrate on the another side; The shape of the square aperture resonant ring SRR of vertical openings is that the square aperture resonant ring SRR by transverse opening obtains behind its center half-twist, and etching has etching on position and the another side of square aperture resonant ring SRR of a plurality of transverse openings to have the position of square aperture resonant ring SRR of a plurality of vertical openings corresponding one by one on the said one side;
The bar shaped medium substrate etching that the single face of the second bar shaped medium substrate covers copper forms, and the said copper that covers is strip.
The invention has the advantages that: the effect of the first bar shaped medium substrate is to utilize square aperture resonant ring SRR to cause magnetic resonance; Make the magnetic permeability of lens approach zero; The effect of the second bar shaped medium substrate is to utilize metal strap to cause electric resonance, makes the dielectric constant of lens approach zero.
The present invention has the zero refractor of electric resonance structure and magnetic resonance structure simultaneously; Its dielectric constant can very similar trend level off to zero with magnetic permeability; Thereby the present invention and air have fabulous impedance matching property, and further reduce refractive index and widen frequency band.
The present invention can directly be placed on the bore top of traditional antenna, and can significantly improve the radiation gain of antenna.The present invention has versatility to different antennas, need not carry out structure optimization separately to different antennas.
Description of drawings
Fig. 1 is the structural representation that reflects microwave lens based on zero of electromagnetism double resonance structure of the present invention.
Fig. 2 is the structural representation of one side of the first bar shaped medium substrate of zero refraction microwave lens based on electromagnetism double resonance structure of the present invention.
Fig. 3 is the structural representation of another side of the first bar shaped medium substrate of zero refraction microwave lens based on electromagnetism double resonance structure of the present invention.
Fig. 4 covers the structural representation of copper for the single face that reflects the second bar shaped medium substrate of microwave lens based on zero of electromagnetism double resonance structure of the present invention.
Fig. 5 is the structural representation of square aperture resonant ring SRR of vertical openings of the first bar shaped medium substrate of zero refraction microwave lens based on electromagnetism double resonance structure of the present invention.
Fig. 6 is a H face horn antenna E face far-field pattern, and wherein, curve b is the E face far-field pattern curve of existing H face horn antenna; Curve a is provided with the E face far-field pattern curve that obtains behind the zero refraction microwave lens based on electromagnetism double resonance structure of the present invention at this antenna actinal surface,
Fig. 7 is under the situation of Fig. 6, in the 8.9-10.8GHz frequency range, and horn antenna gain curve figure.
Fig. 8 is a paster antenna E face far-field pattern, and wherein, curve c is the E face far-field pattern curve of existing paster antenna.Curve e is for being provided with the E face far-field pattern curve that obtains behind the zero refraction microwave lens based on electromagnetism double resonance structure of the present invention at this antenna actinal surface.
Fig. 9 is under the situation of Fig. 8, in the 9.7-10.2GHz frequency range, and paster antenna gain curve figure.
Embodiment
Embodiment one: combine Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5 that this execution mode is described; Zero refraction microwave lens based on electromagnetism double resonance structure of the present invention; It comprises N first bar shaped medium substrate 1 and N+1 the second bar shaped medium substrate 2; N+1 the second bar shaped medium substrate 2 and N the first bar shaped medium substrate 1 is alternate and be arranged parallel to each other, and the first bar shaped medium substrate 1 is identical with the profile of the second bar shaped medium substrate 2;
Distance between individual first bar shaped medium substrate 1 of adjacent N and the individual second bar shaped medium substrate 2 of N+1 is respectively d1, d2, d1, d2 ... D2;
The first bar shaped medium substrate 1 is that the bar shaped medium substrate etching by double-sided copper-clad forms; Wherein one side goes up the square aperture resonant ring SRR3 that etching has a plurality of transverse openings of arranging by the length direction of this bar shaped medium substrate, and etching has the square aperture resonant ring SRR4 of a plurality of vertical openings of arranging by the length direction of this bar shaped medium substrate on the another side; The shape of the square aperture resonant ring SRR4 of vertical openings is that the square aperture resonant ring SRR3 by transverse opening obtains behind its center half-twist, and etching has etching on position and the another side of square aperture resonant ring SRR3 of a plurality of transverse openings to have the position of square aperture resonant ring SRR4 of a plurality of vertical openings corresponding one by one on the said one side;
The bar shaped medium substrate etching that the single face of the second bar shaped medium substrate 2 covers copper forms, and the said copper that covers is strip.
The length of the first bar shaped medium substrate 1 and the second bar shaped medium substrate 2 is identical. concrete size will be decided according to concrete antenna, and the actinal surface of antenna is big more, and length is long more.Wherein quantity N depends on antenna actinal surface size, and N gets appropriate value makes the lens size be slightly larger than the antenna actinal surface.N is an integer, and the antenna actinal surface is big more, and N is big more.
Embodiment two: combine Fig. 2 that this execution mode is described, this execution mode is that said d1 is 2.9mm to the further specifying of the described zero refraction microwave lens based on electromagnetism double resonance structure of embodiment one, and d2 is 3.7mm.
Embodiment three: this execution mode is that the adjacent square aperture resonant ring SRR of the first bar shaped medium substrate 1 is 1.2mm apart from d3 to the further specifying of the described zero refraction microwave lens based on electromagnetism double resonance structure of embodiment two.
Embodiment four: this execution mode is that the width I1 of the first bar shaped medium substrate 1 and the second bar shaped medium substrate 2 is 8mm to the further specifying of the described zero refraction microwave lens based on electromagnetism double resonance structure of embodiment three.
Embodiment five: this execution mode is that the width I3 that the strip of the second bar shaped medium substrate 2 covers copper is 6.6mm to the further specifying of the described zero refraction microwave lens based on electromagnetism double resonance structure of embodiment five.
Embodiment six: this execution mode is further specifying the described zero refraction microwave lens based on electromagnetism double resonance structure of embodiment six; The length of side I2 of square aperture resonant ring SRR is 5.4mm; The wide S of opening of square aperture resonant ring SRR is 0.4mm, and the width W of square aperture resonant ring SRR is 0.8mm.
Embodiment seven: this execution mode is that the thickness of the first bar shaped medium substrate 1 and the second bar shaped medium substrate 2 is 0.8mm to the further specifying of the described zero refraction microwave lens based on electromagnetism double resonance structure of embodiment six.
Embodiment eight: this execution mode is that the dielectric constant of dielectric-slab is 2.2 to the further specifying of the described zero refraction microwave lens based on electromagnetism double resonance structure of embodiment six.
The dielectric-slab model is F4BMX-2.
Certainly also available other materials, but need change the structural parameters of lens according to properties of materials.For the mounting medium substrate can be done framework with the material that dielectric constant and magnetic permeability approach air.
The first bar shaped medium substrate 1 and the second bar shaped medium substrate 2 are arranged by above-mentioned size; Can realize the electromagnetism double resonance; Even dielectric constant and magnetic permeability are the almost equal zero value that approaches simultaneously; Realize the coupling of lens peculiarity impedance and air, and further reduce refractive index and widen frequency band.
Thought of the present invention is equally applicable to other operating frequencies, only need be directed to the different working frequency, utilizes commercial electromagnetism simulation software (like the CST microwave studio), and this antenna lens is carried out modeling and simulating, and the adjustment parameter is to adapt to required frequency.
With H face loudspeaker is example, observes when having or not lens, and what antenna pattern has change:
Fig. 6 is that H face horn antenna E face far-field pattern is in the contrast that has under the lensless situation.Can find that by Fig. 6 the directionality of antenna E face far-field pattern has had obvious improvement, when half-power point lobe width 36.65 ° during by no lens narrow down to lens 9.06 °, gain improves 3.88dB.Fig. 7 is in the 8.9-10.8GHz frequency range, and lens are to the situation of this horn antenna improving gain.Through observation, these lens are in the frequency range of 8.9-10.8GHz, and head can effectively improve the horn antenna gain.Relative bandwidth reaches 19.3%.
With a paster antenna is example, observes when having or not lens, and what antenna pattern has change:
This paster antenna of Fig. 8 E face far-field pattern is in the contrast that has under the lensless situation.Can find that by Fig. 8 the directionality of antenna E face far-field pattern has had obvious improvement, when half-power point lobe width 74.18 ° during by no lens narrow down to lens 24.24 °, gain improves 4.8dB.Fig. 9 is in the frequency range of 9.7-10.2GHz, and these lens are to the situation of this paster antenna improving gain.Can find that in this frequency range, these lens can effectively improve its gain.
This shows in the very wide frequency band of these lens horn antenna and paster antenna all to be had appreciable gain and improve effect, prove that these lens have versatility to different antennae, need not be directed against different antennae and not do structural adjustment and optimization.
Claims (8)
1. reflect microwave lens based on zero of electromagnetism double resonance structure; It is characterized in that; It comprises N the first bar shaped medium substrate (1) and N+1 the second bar shaped medium substrate (2); N+1 the second bar shaped medium substrate (2) is alternate and be arranged parallel to each other with N first bar shaped medium substrate (1), and the first bar shaped medium substrate (1) is identical with the profile of the second bar shaped medium substrate (2);
Distance between individual first bar shaped medium substrate (1) of adjacent N and the individual second bar shaped medium substrate (2) of N+1 is respectively d1, d2, d1, d2 ... D2;
The first bar shaped medium substrate (1) is that the bar shaped medium substrate etching by double-sided copper-clad forms; Wherein one side goes up the square aperture resonant ring SRR (3) that etching has a plurality of transverse openings of arranging by the length direction of this bar shaped medium substrate, and etching has the square aperture resonant ring SRR (4) of a plurality of vertical openings of arranging by the length direction of this bar shaped medium substrate on the another side; The shape of the square aperture resonant ring SRR (4) of vertical openings is that the square aperture resonant ring SRR (3) by transverse opening obtains behind its center half-twist, and etching has etching on position and the another side of square aperture resonant ring SRR (3) of a plurality of transverse openings to have the position of square aperture resonant ring SRR (4) of a plurality of vertical openings corresponding one by one on the said one side;
The bar shaped medium substrate etching that the single face of the second bar shaped medium substrate (2) covers copper forms, and the said copper that covers is strip.
2. zero refraction microwave lens based on electromagnetism double resonance structure according to claim 1 is characterized in that said d1 is 2.9mm, and d2 is 3.7mm.
3. zero refraction microwave lens based on electromagnetism double resonance structure according to claim 2 is characterized in that the adjacent square aperture resonant ring SRR of the first bar shaped medium substrate (1) is 1.2mm apart from d3.
4. zero refraction microwave lens based on electromagnetism double resonance structure according to claim 2 is characterized in that the width I1 of the first bar shaped medium substrate (1) and the second bar shaped medium substrate (2) is 8mm.
5. zero refraction microwave lens based on electromagnetism double resonance structure according to claim 2 is characterized in that the width I3 that the strip of the second bar shaped medium substrate (2) covers copper is 6.6mm.
6. zero refraction microwave lens based on electromagnetism double resonance structure according to claim 2; It is characterized in that; The length of side I2 of square aperture resonant ring SRR is 5.4mm, and the wide S of opening of square aperture resonant ring SRR is 0.4mm, and the width W of square aperture resonant ring SRR is 0.8mm.
7. zero refraction microwave lens based on electromagnetism double resonance structure according to claim 2 is characterized in that the thickness of the first bar shaped medium substrate (1) and the second bar shaped medium substrate (2) is 0.8mm.
8. zero refraction microwave lens based on electromagnetism double resonance structure according to claim 2, the dielectric constant of dielectric-slab is 2.2.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105226378A (en) * | 2015-10-14 | 2016-01-06 | 东南大学 | Based on the compact high directionality plate aerial of zero refraction materials |
| CN107026330A (en) * | 2017-03-23 | 2017-08-08 | 中国电子科技集团公司第三十六研究所 | The zero refraction microwave lens based on electromagnetism dual resonance structure |
| CN110943303A (en) * | 2019-10-29 | 2020-03-31 | Oppo广东移动通信有限公司 | Array lens, lens antenna, and electronic apparatus |
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2012
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105226378A (en) * | 2015-10-14 | 2016-01-06 | 东南大学 | Based on the compact high directionality plate aerial of zero refraction materials |
| CN107026330A (en) * | 2017-03-23 | 2017-08-08 | 中国电子科技集团公司第三十六研究所 | The zero refraction microwave lens based on electromagnetism dual resonance structure |
| CN110943303A (en) * | 2019-10-29 | 2020-03-31 | Oppo广东移动通信有限公司 | Array lens, lens antenna, and electronic apparatus |
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Application publication date: 20120912 |