CN101572355A - Antenna reflector with a compact single-surface photo band gap (PBG) periodic structure - Google Patents
Antenna reflector with a compact single-surface photo band gap (PBG) periodic structure Download PDFInfo
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- CN101572355A CN101572355A CNA200910072290XA CN200910072290A CN101572355A CN 101572355 A CN101572355 A CN 101572355A CN A200910072290X A CNA200910072290X A CN A200910072290XA CN 200910072290 A CN200910072290 A CN 200910072290A CN 101572355 A CN101572355 A CN 101572355A
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Abstract
The invention provides an antenna reflector with a compact single-surface PBG periodic structure, which relates to an antenna reflector and solves the problems of oversize volume and restricted working frequency band of the existing antenna reflector with the PBG structure. The metal layer of the antenna reflector with the compact single-surface PBG periodic structure is provided with at least one PBG unit; each PBG unit has a four-arm helical structure; all the PBG units form the compact single-surface PBG periodic structure in the same plane. The invention can be used as the reflector of a military antenna and the reflector of a civil antenna.
Description
Technical field
The present invention relates to a kind of antenna reflector.
Background technology
The miniaturization technology of antenna becomes the important topic of the communications field, all more and more comes into one's own in dual-use field, and progressively becomes the focus of research.And in actual conditions because be subjected to that installing space is narrow and small, the restriction of complete machine size or the like, live to require under the condition that does not influence antenna radiation performance, to reduce the size of antenna; And the antenna more weak to some directivity need add reflector, strengthens the directivity of its radiation, and reflector size is very important to antenna miniaturization.When reflector is desirable infinitely great metallic plate, antenna and metallic plate are at a distance of L, perfact conductor (PEC) surface is thought in the metal surface, by " mirror image " principle in the electromagnetic theory as can be known, CURRENT DISTRIBUTION distributes opposite with its " image current " on the antenna, the antenna far region radiation field is at a distance of 2L, and promptly two radiation field of aerials that distributed current is opposite superpose.When L → 0, incident wave is opposite with the reflected wave phase place, cancels out each other, and antenna can not effective radiant energy; When L ≈ λ/4, incident wave and reflected wave are with superimposed, and antenna radiation efficiency is the highest.
Antenna reflector commonly used has metallic plate (or metal wire), photonic crystal or the like.The photonic crystal basic feature is to have photon band gap (Photonic Bandgap, PBG), PBG spatially can be divided into one dimension, two dimension, three-dimensional structure, the high impedance surface pbg structure can be regarded two-dimensional photon crystal structure as, and in the very high frequency range of impedance, the magnetic field normal component is very little, corresponding with " electric conductor ", this structure is called as " magnetic conductor ", and promptly when L → 0, incident wave and reflected wave are with superimposed.Du Te boundary condition thus, high impedance surface can be used as the floor of low profile antenna, and image current homophase rather than anti-phase, adjacent cells be effectively radiation still.
The problem that the antenna emitter of existing P BG structure exists: one, volume: more weak or only need the antenna of one-way radiation for some directivity, adding reflectorizes can improve its gain.Reflector commonly used is infinitely great metallic plate.When being used as antenna reflector for general pbg structure, its reflector size wants the ratio antenna size a lot of greatly, and often undersized antenna needs large-sized reflector; Two, frequency band: metallic reflection plate and traditional pbg structure can only play reflex in extremely limited frequency range, working band is limited, and some broadband or its application of multiband antenna are restricted.
Summary of the invention
The present invention is, a working band restricted problem excessive for the volume of the antenna reflector that solves existing P BG structure, thereby a kind of antenna reflector of compact single-surface photo band gap (PBG) periodic structure is provided.
A kind of antenna reflector of compact single-surface photo band gap (PBG) periodic structure, it comprises metal level, dielectric layer and floor, and described metal level is connected with the upper surface of dielectric layer, and the lower surface of described dielectric layer is connected with the upper surface on floor; Be processed with at least one PBG unit on the described metal level, described each PBG unit is four arm helical structures, and compact single-surface photo band gap (PBG) periodic structure is formed in all PBG unit in same plane, and the area of described each PBG unit is identical.
The present invention adopts four arm spiral type compact single-surface photo band gap (PBG) periodic structures, because it is very little that this pbg structure individual unit can be done, so the periodic arrangement size is little, can reduce the volume of reflector significantly, the volume of comparing existing classical UC-PBG structure has reduced more than 70%, has reduced more than 55% than the volume of existing modified model UC-PBG structure; Working band is wide simultaneously, is more than 2 times of bandwidth of existing classical UC-PBG structure, is more than 4 times of bandwidth of existing modified model UC-PBG structure, is applicable to broadband or multiband antenna.
Description of drawings
Fig. 1 is a structural representation of the present invention; Fig. 2 is the vertical view of Fig. 1; Fig. 3 is the structural representation of a PBG unit; Fig. 4 is the structural representation of a unit of classical UC-PBG reflector; Fig. 5 is the structural representation of a unit of modified model UC-PBG reflector; Fig. 6 is the transmitter, phase curve of the UC-PBG reflector of embodiment seven, and wherein abscissa is the bandgap center frequency, and ordinate is a transmitter, phase; Fig. 7 is the wide influence curve to band gap of the metal arm of PBG of the present invention unit, and wherein abscissa is the bandgap center frequency, and ordinate is a phase place; The arm of curve 71 is wide to be 0.25mm, and the arm of curve 72 is wide to be 0.3, and the arm of curve 73 is wide to be 0.4; Slit in Fig. 8 PBG of the present invention unit is to the influence curve of band gap, and wherein abscissa is the bandgap center frequency, and ordinate is a phase place; The gap width of curve 81 is 0.2mm, and the gap width of curve 82 is 0.3mm, and the gap width of curve 83 is 0.4mm.
Embodiment
Embodiment one: this embodiment is described in conjunction with Fig. 1, Fig. 2 and Fig. 3, a kind of antenna reflector of compact single-surface photo band gap (PBG) periodic structure, it comprises metal level 1, dielectric layer 2 and floor 3, described metal level 1 is connected with the upper surface of dielectric layer 2, and the lower surface of described dielectric layer 2 is connected with the upper surface on floor 3; Be processed with at least one PBG1-1 unit on the described metal level 1, described each PBG unit 1-1 is four arm helical structures, all PBG unit 1-1 form compact single-surface photo band gap (PBG) periodic structure in same plane, the area of described each PBG unit 1-1 is identical.
Described each PBG unit 1-1 includes four independently metal arms, and each metal arm is to form by four sections sheet metals, promptly form by first section sheet metal, second section sheet metal, the 3rd section sheet metal and the 4th section sheet metal,
Described first section sheet metal 1-1-1, second section sheet metal 1-1-2, the 3rd section sheet metal 1-1-3 and the 4th section metal 1-1-4 leaf length ratio are 1: 2: 3: 4, described first section sheet metal 1-1-1 is parallel with the 3rd section sheet metal 1-1-3, second section sheet metal 1-1-2 is parallel with the 4th section sheet metal 1-1-4, first section sheet metal 1-1-1 and the 3rd section sheet metal 1-1-3 are all between second section sheet metal 1-1-2 and the 4th section sheet metal 1-1-4, and the end of first section sheet metal 1-1-1 is connected with the end of second section sheet metal 1-1-2, the other end of second section sheet metal 1-1-2 is connected with the end of the 3rd section sheet metal 1-1-3, the other end of the 3rd section sheet metal 1-1-3 is connected with the end of the 4th section sheet metal 1-1-4, and every two adjacent sheet metals are vertical mutually among described four sections sheet metal 1-1-4; First section sheet metal 1-1-1 of described four metal arms all is positioned at the center of PBG unit 1-1, and described four sheet metals are with the mutual spiralization rectangular configuration in same center; The other end of the 4th section sheet metal 1-1-4 of described adjacent PBG unit 1-1 interconnects.
Spacing in four metal arms between adjacent two metal arms is identical, and the width of each metal arm is all identical.
According to " mirror image " principle in the Theory of Electromagnetic Field, for infinitely great metallic plate, when the distance of antenna and reflector be operation wavelength 1/4 the time, its gain can double.In the middle of the reality, when antenna and reflector are generally between λ/4～λ/16 (λ is an operation wavelength) apart, just can play the effect of enhance antenna directionality, for the antenna of a few thing in low-frequency range, its operation wavelength is longer, is unfavorable for realizing that antenna hangs down section.If reflector adopts pbg structure, because its homophase reflection characteristic, the distance of antenna and reflecting plate can be very near, and its distance is less than the situation that installs the metallic plate reflector additional, thus the low section of realization antenna.On the other hand, because pbg structure has periodically (the PBG unit is by periodic arrangement), the PBG cycle is many more, and antenna directivity is good more.
Embodiment two: this embodiment is that with the difference of the antenna reflector of embodiment one described a kind of compact single-surface photo band gap (PBG) periodic structure the material of described metal level 1 is a copper.
Embodiment three: this embodiment is with the difference of the antenna reflector of embodiment one or two described a kind of compact single-surface photo band gap (PBG) periodic structures, adopts photoetching method to obtain each PBG unit 1-1 of metal level 1 upper surface.
Embodiment four: this embodiment is with the difference of the antenna reflector of embodiment one or two described a kind of compact single-surface photo band gap (PBG) periodic structures, adopts caustic solution to obtain each PBG unit 1-1 of metal level 1 upper surface.
Embodiment five: this embodiment is that with the difference of the antenna reflector of embodiment one, two or four described a kind of compact single-surface photo band gap (PBG) periodic structures the material of described dielectric layer 2 is a high dielectric constant material, as pottery.
The dielectric constant of medium is big more, and the area of PBG unit is just more little.
Embodiment six: this embodiment is described in conjunction with Fig. 3, this embodiment is with the difference of the antenna reflector of embodiment five described a kind of compact single-surface photo band gap (PBG) periodic structures, the size of described each PBG unit 1-1 is between 2mm～10mm, the width of a metal arm among each PBG unit 1-1 is between 0.1mm～1.0mm, and the gap width between two metal arms among each PBG unit 1-1 is between 0.1mm～1.0mm.
Embodiment seven: this embodiment adopts the structure of embodiment one, is illustrated according to concrete parameter:
For a PBG unit.A is the size of individual unit, and w is the metal arm width, and g is the gap between the metal arm.A=5.2mm wherein, w=0.25mm, g=0.4mm.Dielectric-slab thickness is 4mm, DIELECTRIC CONSTANT
r=9.6.Adopt Unit 30 * 30, it is carried out emulation, simulation result as shown in Figure 3.
Volume for the antenna reflector of explanation single face compact optical subband crack periodic structure provides classical UC-PBG structure (as shown in Figure 4) and a kind of modified model UC-PBG structure (as shown in Figure 5) below, and they is compared.
Get the dielectric-slab of identical dielectric constant, thickness, with same centre frequency f
0=1.575GHz is a target, and the performance of three kinds of PBG is carried out simulation calculation, tabulate after relatively:
This shows that the volume of the antenna reflector of compact single-surface photo band gap (PBG) periodic structure has only 28% of classical UC-PBG, is to improve 42% of UC-PBG, and volume obviously reduces.Classical UC-PBG band gap width 80MHz improve UC-PBG band gap width 42MHz, and spiral type UC-PBG bandwidth is 170MHz, and working band is widened significantly.
It is very little that spiral type UC-PBG cell size can be done, so its periodic structure is very little.If when adopting identical big or small reflecting plate more spirality PBG unit can be arranged, the unit is many more, and the effect that reaches is good more; If adopt the pbg structure of similar number, it is very little that reflecting plate can be done; Its broader bandwidth, applied range.
Claims (6)
1, a kind of antenna reflector of compact single-surface photo band gap (PBG) periodic structure, it comprises metal level (1), dielectric layer (2) and floor (3), described metal level (1) is connected with the upper surface of dielectric layer (2), and the lower surface of described dielectric layer (2) is connected with the upper surface of floor (3); It is characterized in that: be processed with at least one PBG (1-1) unit on the described metal level (1), described each PBG unit (1-1) is four arm helical structures, compact single-surface photo band gap (PBG) periodic structure is formed in all PBG unit (1-1) in same plane, the area of described each PBG unit (1-1) is identical.
2, the antenna reflector of a kind of compact single-surface photo band gap (PBG) periodic structure according to claim 1, the material that it is characterized in that described metal level (1) is a copper.
3, the antenna reflector of a kind of compact single-surface photo band gap (PBG) periodic structure according to claim 1 and 2 is characterized in that adopting photoetching method to obtain each PBG unit (1-1) of metal level (1) upper surface.
4, the antenna reflector of a kind of compact single-surface photo band gap (PBG) periodic structure according to claim 1 and 2 is characterized in that adopting caustic solution to obtain each PBG unit (1-1) of metal level (1) upper surface.
5, the antenna reflector of a kind of compact single-surface photo band gap (PBG) periodic structure according to claim 1 and 2, the material that it is characterized in that described dielectric layer (2) is a high dielectric constant material.
6, the antenna reflector of a kind of compact single-surface photo band gap (PBG) periodic structure according to claim 5, the size that it is characterized in that described each PBG unit (1-1) is between 2mm～10mm, the width of a metal arm in each PBG unit (1-1) is between 0.1mm～1.0mm, and the gap width between two metal arms in each PBG unit (1-1) is between 0.1mm～1.0mm.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102456951A (en) * | 2010-10-14 | 2012-05-16 | 中国移动通信集团江苏有限公司 | Base station antenna |
| CN102800987A (en) * | 2011-06-03 | 2012-11-28 | 深圳光启高等理工研究院 | Metamaterial reflecting mirror |
| CN104617361A (en) * | 2015-03-01 | 2015-05-13 | 中国人民解放军国防科学技术大学 | Three-way bandwidth frequency band frequency selecting surface structure and antenna cover |
| CN106207448A (en) * | 2016-08-26 | 2016-12-07 | 长安大学 | A kind of utilize three-D photon crystal as the dipole antenna of reflection substrate |
| CN107579339A (en) * | 2017-09-11 | 2018-01-12 | 电子科技大学 | A kind of spiral near field antenna with group's reading performance |
| CN108493594A (en) * | 2018-02-05 | 2018-09-04 | 厦门致联科技有限公司 | A kind of hyperfrequency near field antenna being evenly distributed |
| CN116526701A (en) * | 2023-05-19 | 2023-08-01 | 山西大同大学 | Wireless energy transmission system based on artificial magnetic conductor with four-arm spiral structure |
-
2009
- 2009-06-15 CN CNA200910072290XA patent/CN101572355A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102456951A (en) * | 2010-10-14 | 2012-05-16 | 中国移动通信集团江苏有限公司 | Base station antenna |
| CN102456951B (en) * | 2010-10-14 | 2014-06-04 | 中国移动通信集团江苏有限公司 | Base station antenna |
| CN102800987A (en) * | 2011-06-03 | 2012-11-28 | 深圳光启高等理工研究院 | Metamaterial reflecting mirror |
| CN102800987B (en) * | 2011-06-03 | 2015-04-22 | 深圳光启高等理工研究院 | Metamaterial reflecting mirror |
| CN104617361A (en) * | 2015-03-01 | 2015-05-13 | 中国人民解放军国防科学技术大学 | Three-way bandwidth frequency band frequency selecting surface structure and antenna cover |
| CN106207448A (en) * | 2016-08-26 | 2016-12-07 | 长安大学 | A kind of utilize three-D photon crystal as the dipole antenna of reflection substrate |
| CN107579339A (en) * | 2017-09-11 | 2018-01-12 | 电子科技大学 | A kind of spiral near field antenna with group's reading performance |
| CN107579339B (en) * | 2017-09-11 | 2019-07-09 | 电子科技大学 | A kind of spiral near field antenna with group's reading performance |
| CN108493594A (en) * | 2018-02-05 | 2018-09-04 | 厦门致联科技有限公司 | A kind of hyperfrequency near field antenna being evenly distributed |
| CN116526701A (en) * | 2023-05-19 | 2023-08-01 | 山西大同大学 | Wireless energy transmission system based on artificial magnetic conductor with four-arm spiral structure |
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Application publication date: 20091104 |