CN103259096A - Oval intersecting nesting multi-loop recursive microstrip antenna for compass system - Google Patents
Oval intersecting nesting multi-loop recursive microstrip antenna for compass system Download PDFInfo
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- CN103259096A CN103259096A CN2013101832195A CN201310183219A CN103259096A CN 103259096 A CN103259096 A CN 103259096A CN 2013101832195 A CN2013101832195 A CN 2013101832195A CN 201310183219 A CN201310183219 A CN 201310183219A CN 103259096 A CN103259096 A CN 103259096A
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Abstract
The invention relates to a microstrip antenna of a loop-shaped structure, in particular to an oval intersecting nesting multi-loop recursive microstrip antenna for a compass system. The oval intersecting nesting multi-loop recursive microstrip antenna for the compass system is provided with a substrate. Two surfaces of the substrate are coated with good conductors. The good conductors located on the upper surface are processed to be an oval intersecting nesting multi-loop recursive radiating adhesive sheet. An outer loop of the multi-loop recursive radiating adhesive sheet is composed of N oval arcs in an intersecting mode. The focal points of the oval arcs are located on radiating lines of i*360 degrees/N, each oval arc has a long axis and a short axis, and the long axes and the short axes of the oval arcs which form outer contours are identical. A series of recursive nesting contours of the same shape are formed in a shrinking mode according to a ratio eta of the oval short axes of two adjacent loops in the same composing mode. The eta is 0.2 to 0.9 and recursive times are 3 to 11. The conductors between uneven number times and even number times are eliminated, so that a series of gap nesting loops with contour sizes reduced in a recursive mode are formed. The good conductors with the widths between 0.5mm to 2mmare reserved on the ray portion of i*360 degrees/N of the gap nesting loops.
Description
Technical field
The present invention relates to a kind of microstrip antenna of circulus, relate in particular to the nested many ring recurrence microstrip antennas of a kind of ellipse intersection for dipper system.
Background technology
China Beidou satellite navigation system (COMPASS, Chinese transliteration title BeiDou), as the GPS (Global Position System) of Chinese independent development, autonomous operation, be the important space information infrastructure that country is building, can be widely used in the every field of current economic society.2003, operation is built up and opened to China's Big Dipper generation, and China had launched first Big Dipper two generations satellite in 2007, short several in the period of triones navigation system developing fast.Particularly China has launched many big-dipper satellites after 2010, and when February 25 2012 Beijing time zero 12 minutes, China with " No. three first of the Long March " carrier rocket, successfully sends the 11 Big Dipper navigation satellite of China into the predetermined transfer orbit of space in Xichang Launching Site.This is the 9th inclination geo-synchronous orbit satellite of Chinese Beidou satellite navigation system networking, and succeeding in sending up of 11 Big Dipper navigation satellites of this order indicates that the construction of Chinese Big Dipper region satellite navigation system steps essential step again.At present, the Big Dipper two generations series satellite rises and will enter the networking peak period this year, estimates the system covering the whole world that is made up of thirties satellites formation in 2015.
Antenna be satellite navigation system essential also be vital part, can it determining satellite navigation system normally bring into play its action and function, so the design of ICBM SHF satellite terminal antenna has very important practical sense to the development of satellite navigation cause.Along with the deep structure of Beidou satellite navigation system, the independent development of miniaturization terminal antenna and product practicability are extremely urgent.The modal scheme that reduces antenna size is to fold in the confined space, fractal folding is owing to it often is applied in the antenna design (Xiao-Qin Tian, Shao-bin Liu and Xue-yong Zhang.Circularly polarized microstrip antenna with slots for Beidou Navigation System.ISSSE Sept 2010:1-3) in Frequency point control and frequency related fields special advantages.The main representative figure of foreign study fractal antenna has Nathan Cohen and the Hispanic Carles Puente Baliarda of the U.S., and they have established Fractal Antenna Systems company and Fractus S.A. company respectively.Wherein, the research of Nathan Cohen mainly concentrates on the Koch fractal antenna with size compression property, and C.Puente then mainly studies the Sierpinski fractal antenna with multifrequency characteristic, has begun to obtain actual application though also improve not to the utmost.The research of fractal antenna at present mainly comprises two aspects: antenna element and the aerial array with fractal arrangement with fractal structure, fractal loop antenna, fractal slot antenna, fractal frequency-selective surfaces have also obtained extensive use in addition, new fractal antenna structure will continue to bring out (.YB Thakare and Rajkumar.Design of fractal patch antenna for size and radar cross-section reduction.IET Microwave.Antenna Propagation, 2010, vol.4, Iss.2, PP:175-181).
Oval intersection is nested encircles the recurrence microstrip antennas more, also can regard as according to the definition of class fractal structure to be a kind of fractal antenna, and it has used novel nested fractal structure, and the good radiation characteristic that combines oval structure simultaneously can be advantageously applied to dipper system.At present, the fractal loop antenna of novel nested structure is applied to dipper system and yet there are no report.
Summary of the invention
The object of the present invention is to provide that return loss is low, gain is high, it is little to disturb and the ellipse that is used for dipper system that tool hemisphere covers radiation characteristic intersects nested many ring recurrence microstrip antennas.
The present invention is provided with substrate, on two surfaces of substrate, be covered with upper surface conductor layer and lower surface conductor layer respectively, the upper surface conductor layer is processed into the oval nested many ring recurrence radiation patch of intersecting, the outer shroud of described many ring recurrence radiation patch is positioned at i * 360 °/N(i=1 by N focus, 2, N) the overlapping formation of elliptic arc that has major and minor axis on the radiation, even number between the N desirable 2～18, the major and minor axis of each elliptic arc of composition outline is all identical, major axis length can be 10～40mm, and minor axis length can be 6～12mm; Dwindle the same pattern nested profile that forms a series of recurrence with identical constituted mode by the ratio η of the ellipse short shaft of forming adjacent two rings, η is desirable 0.2～0.9, and the number of times of recurrence can be 3～11; The minor axis length of interior profile elliptic arc can be 1.6～10mm, major axis length can be 5～20mm, good conductor between odd number time and the even number time recurrence is removed, form the slit nested rings that a series of overall size recurrence reduce, i * 360 of described slit nested rings °/N(i=1,2 ... N) ray partly keeps the good conductor that width is 0.5～2mm; Described lower surface conductor layer is as ground plate.
Described upper surface conductor layer and lower surface conductor layer can adopt copper conductor layer or silver conductor layer etc.
The present invention also adopts the form of coaxial feed, on the center of distributing point near paster, and can move 1～2mm to the left and right, and 1～1.5mm fluctuates; And can double-fed be set as required, realize intensive multimodal characteristic.
Basic structure of the present invention can guarantee that frequency covers whole frequency range requirements of big-dipper satellite system by adjusting the scope of above each parameter, optimize to obtain, and return loss S
11Can reach-below the 10dB, gain can reach more than the 3dB.
Compare with conventional microstrip antenna, the present invention has following advantage:
The present invention has used novel nested form, utilize fractal broadband/multifrequency stack/advantages such as high radiation resistance/bootstrap loading, by the complex optimum of series technique, realized the miniaturization of antenna, can satisfy the requirement of satellite communication systems such as the Big Dipper and GPS well.
Owing to adopted above structure, so the present invention has the characteristics of directed radiation, and frequency is 1.6GHz, and its working frequency range is 1.52～1.64GHz, and absolute bandwidth is 7MHz, and relative bandwidth is 0.43%.Oval major and minor axis length be can reasonably optimize on the good conductor radiating surface, the frequency of expecting and the performance of each parameter of antenna obtained as required.
In sum, the present invention has that size is little, novel structure, radiation characteristic are good, be subjected to that such environmental effects is little, cost is low and be easy to advantages such as integrated, can satisfy satellite communication systems such as big-dipper satellite and GPS navigation to the requirement of antenna.
Utilize structure of the present invention, get different nested numbers and recurrence number of times and carry out complex optimum, can be locked in Big Dipper series global position system and the gps system by demand is flexible, also be expected to compatible other communications bands.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention.In Fig. 1, unit is mm, and R represents the main radius of elliptic arc, and oval axial ratio is 3.2, and power feed hole 4 coordinates are (0.45,1).
Fig. 2 is the main TV structure schematic diagram of the embodiment of the invention.
Fig. 3 is the return loss (S of the embodiment of the invention
11) performance map.In Fig. 3, abscissa is represented frequency Frequency (GHz), and ordinate is represented return loss intensity The return loss of the antenna (dB).
Fig. 4 is the E face directional diagram of the embodiment of the invention.In Fig. 4, coordinate is polar coordinates.
Fig. 5 is the H face directional diagram of the embodiment of the invention.In Fig. 5, coordinate is polar coordinates.
Embodiment
The invention will be further described below in conjunction with specific embodiments and the drawings.
With reference to Fig. 1 and Fig. 2, the embodiment of the invention adopts two-sided copper-plated ceramic dielectric substrate 1, and it is long to be 26mm ± 0.1mm, and wide is 26mm ± 0.1mm, and height is 2.5mm ± 0.1mm.Two sides at ceramic dielectric substrate 1 is covered with copper, and a metal etch of medium substrate becomes the oval nested many ring recurrence radiation patch 2 of intersecting, and the another side metal is as ground plate face 3.The ellipse of etching intersects the outer shroud of nested many ring recurrence radiation patch and is positioned at i * 360 °/N(i=1 by N focus in the copper-clad 2, and 2 ... N) have the overlapping formation of elliptic arc of a certain size major and minor axis on the radiation, N preferably gets 8.The major and minor axis of each elliptic arc of composition outline is all identical, and axial ratio preferably gets 3.2, and major axis is long preferably gets 25.6mm, and minor axis length is 2 * R1, and R1 preferably gets 4mm.By identical constituted mode, from outside to inside, the long 21.1mm that preferably gets of major axis that forms second elliptic arc, minor axis length is 2 * R2, R2 preferably gets 3.3mm, form the major axis length of the 3rd elliptic arc and preferably get 19.2mm, minor axis length is 2 * R3, and R3 preferably gets 3mm, the long 17.9mm that preferably gets of major axis that forms the 4th elliptic arc, minor axis length is 2 * R4, and R4 preferably gets 2.8mm, and the minor axis length of interior profile elliptic arc is 2 * R5, R5 preferably gets 2.5mm, the long 16mm that preferably gets of major axis removes the good conductor between odd number time and the even number time recurrence, can form the slit nested rings structure of a series of recurrence.Wherein, the i of these nested rings * 360 °/N(i=1,2 ... N) ray partly keeps the good conductor of certain width, guarantees that each recurrence ring UNICOM forms complete radiation patch, and the width of good conductor is preferably got 1.6mm.
Mark 5 and mark 6 are the circumferential weld crack among Fig. 1, and the spacing in circumferential weld crack is preferably got 1.6mm; Mark 4 is power feed hole among Fig. 1, and it is that radius is 0.5mm ± 0.01mm, highly passes the hollow cylinder of ceramic dielectric substrate for 2.5mm ± 0.01mm.Adopt form feed such as Fig. 2 of copper axis offset-fed among the present invention, this feed form makes the S of antenna
11Lower, gain increases.Wherein, the inner core of copper axis is connected with rectangle card sheet 2 by the feedback hole, and the outer core of copper axis links to each other with the reflecting plate 3 of ceramic dielectric plate lower surface.
Referring to Fig. 3, as can be seen from Figure 3, the working frequency range of antenna of the present invention can be 1.52～1.64GHz.Return loss (the S of this working frequency range internal antenna
11) all below 10dB, the minimum echo loss at the 1.6Hz place is-34.85dB.From as can be seen last, can both reach requirement in the return loss performance of whole passband internal antenna.Antenna of the present invention is respectively 0.07G and 0.43% in absolute bandwidth and the relative bandwidth of 1.6GHz; Bandwidth is narrower, but stable performance and can directed radiation, thereby can be advantageously applied in the satellite communication systems such as the Big Dipper and GPS.
Referring to Fig. 4 and Fig. 5, Fig. 4 is E face directional diagram, and Fig. 5 is H face directional diagram.As can be seen, the present invention has directional radiation properties from Figure 4 and 5, can satisfy the requirement of satellite communication system, and the gain of antenna has simultaneously better reached 7.62dB, still can further optimize.Table 1 provides manufacturing mismachining tolerance of the present invention to the situation that influences of antenna performance.
Table 1
Annotate: data are existing certain redundant in the table, and certain relevance is arranged between each parameter, and what provide is equalization characteristic, according to demand particular design.
Manufacturing mismachining tolerance of the present invention has certain influence to each parameter of antenna, needs manufacturing process very fine.For example, when width, the size of ceramic dielectric substrate, dielectric-slab copper-clad thickness, the feed position equal error in patch size, slit are controlled in 5%, and the relative dielectric constant error of ceramic dielectric substrate control is in 5% the time, and the parameters of antenna changes little.
Frequency range of the present invention can adopt 1.52～1.64GHz, and baseplate material can adopt 6～30 high-k quality material, preferably gets relative dielectric constant and be 18 composite ceramics, and the desirable encirclement structure outline of ceramic dielectric plate diameter is the oblate post of 15～40mm; Perhaps length is 15～40mm, and wide is the cuboid of 15～40mm.The thickness of oblate post or cuboid is 2～4mm, and diameter/length of side is preferably got 26mm, and thickness is preferably got 2.5mm.
Claims (2)
1. the nested many ring recurrence microstrip antennas of ellipse intersection that are used for dipper system, it is characterized in that being provided with substrate, on two surfaces of substrate, be covered with upper surface conductor layer and lower surface conductor layer respectively, the upper surface conductor layer is processed into the oval nested many ring recurrence radiation patch of intersecting, the outer shroud of described many ring recurrence radiation patch is positioned at the overlapping formation of elliptic arc that has major and minor axis on the radiation of i * 360 °/N by N focus, the major and minor axis of each elliptic arc of composition outline is all identical, major axis length is 10～40mm, and minor axis length is 6～12mm; Dwindle the same pattern nested profile that forms a series of recurrence with identical constituted mode by the ratio η of the ellipse short shaft of forming adjacent two rings, η gets 0.2～0.9, and the number of times of recurrence is 3～11; The minor axis length of interior profile elliptic arc is 1.6～10mm, major axis length is 5～20mm, form the slit nested rings that the overall size recurrence reduces between odd number time and the even number time recurrence, i * 360 of described slit nested rings °/N, ray partly keeps the good conductor that width is 0.5～2mm; Wherein, i=1,2 ... N, N get the even number between 2～18; The lower surface conductor layer is as ground plate.
2. be used for the nested many ring recurrence microstrip antennas of ellipse intersection of dipper system according to claim 1, it is characterized in that described upper surface conductor layer and lower surface conductor layer adopt copper conductor layer or silver conductor layer.
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| CN201310183219.5A CN103259096B (en) | 2013-05-16 | 2013-05-16 | Oval intersecting nesting multi-loop recursive microstrip antenna for compass system |
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Citations (8)
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| WO2004066437A1 (en) * | 2003-01-24 | 2004-08-05 | Fractus, S.A. | Broadside high-directivity microstrip patch antennas |
| US7215290B2 (en) * | 1997-11-07 | 2007-05-08 | Nathan Cohen | Fractal counterpoise, groundplane, loads and resonators |
| CN1996662A (en) * | 2006-12-28 | 2007-07-11 | 上海交通大学 | Ultra-wide antenna with the base-integrated wave guide feedback structure |
| US20110050521A1 (en) * | 1995-08-09 | 2011-03-03 | Fractal Antenna Systems, Inc. | Wideband antenna system for garments |
| CN102005643A (en) * | 2010-10-14 | 2011-04-06 | 厦门大学 | Three-frequency Koch fractal ring mirror image dipole antenna |
| US20120285660A1 (en) * | 2010-05-04 | 2012-11-15 | Alexander Poltorak | Fractal heat transfer device |
| CN202712416U (en) * | 2012-03-01 | 2013-01-30 | 西安电子科技大学 | Ultra wideband antenna |
| CN103151606A (en) * | 2013-02-04 | 2013-06-12 | 河北科技大学 | Nested type Koch fractal Beidou dual-frequency micro-strip antenna |
-
2013
- 2013-05-16 CN CN201310183219.5A patent/CN103259096B/en not_active Expired - Fee Related
Patent Citations (8)
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|---|---|---|---|---|
| US20110050521A1 (en) * | 1995-08-09 | 2011-03-03 | Fractal Antenna Systems, Inc. | Wideband antenna system for garments |
| US7215290B2 (en) * | 1997-11-07 | 2007-05-08 | Nathan Cohen | Fractal counterpoise, groundplane, loads and resonators |
| WO2004066437A1 (en) * | 2003-01-24 | 2004-08-05 | Fractus, S.A. | Broadside high-directivity microstrip patch antennas |
| CN1996662A (en) * | 2006-12-28 | 2007-07-11 | 上海交通大学 | Ultra-wide antenna with the base-integrated wave guide feedback structure |
| US20120285660A1 (en) * | 2010-05-04 | 2012-11-15 | Alexander Poltorak | Fractal heat transfer device |
| CN102005643A (en) * | 2010-10-14 | 2011-04-06 | 厦门大学 | Three-frequency Koch fractal ring mirror image dipole antenna |
| CN202712416U (en) * | 2012-03-01 | 2013-01-30 | 西安电子科技大学 | Ultra wideband antenna |
| CN103151606A (en) * | 2013-02-04 | 2013-06-12 | 河北科技大学 | Nested type Koch fractal Beidou dual-frequency micro-strip antenna |
Non-Patent Citations (2)
| Title |
|---|
| LIN SHU.ET AL: "Simulation Research of a Novel Muti-band Fractal Triangle Antenna", 《PROCEEDINGS OF ASIA-PACIFIC MICROWAVE CONFERENCE 2007》, 31 December 2007 (2007-12-31), pages 1 - 4, XP031279913 * |
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