CN103022660B - Multi-feed-source double-frequency high-separation wide-beam high-stability phase centre antennae - Google Patents
Multi-feed-source double-frequency high-separation wide-beam high-stability phase centre antennae Download PDFInfo
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Abstract
The invention relates to a multi-feed-source double-frequency high-separation wide-beam high-stability phase centre antennae. The multi-feed-source double-frequency high-separation wide-beam high-stability phase centre antennae comprises an antenna cap and a metal inverted frustum substrate, wherein the metal inverted frustum substrate is internally provided with a first power divider and a second power divider, first and second radiating antennas are arranged in the antenna cap and on the metal inverted frustum substrate and are fixed through hollow short circuit screws, and a first coaxial cable is arranged between the first radiating antenna and the metal inverted frustum substrate; one end of an inner core is connected with a radiation fin of the first radiating antenna, the other end of the inner core is connected with a first branch of the first power divider, one end of a shielding layer is connected with ground of the first radiating antenna, and the other end of the shielding layer is connected with the ground of the first power divider; a fifth coaxial cable is arranged between the second radiating antenna and the metal inverted frustum substrate and the fifth coaxial cable passes through the hollow short circuit screws, and the inner core of the fifth coaxial cable is respectively connected with the ground of the second radiating antenna and the first branch of the second power divider; and the shielding layer is respectively connected with the radiation fin of the second radiating antenna and the ground of the second power divider.
Description
Many feeds double frequency high-isolation wide-beam high-stability phase center antenna.
Technical field
The present invention relates to a kind of many feeds double frequency high-isolation wide-beam high-stability phase center antenna being suitable for geodesic survey type satellite navigation ground receiver terminals, the directed satellite navigation ground receiver terminals of hi-Fix, its exemplary operation frequency range is L and S frequency range, has compact conformation, standing wave is little, axial ratio is little, axial ratio bandwidth is wide, double frequency isolation is high, the remarkable advantage such as phase center is overstable within the scope of broad beam.Be mainly used in the geodesic survey type satellite navigation ground receiver terminals of the grade positioning precision in US Global satellite navigation system, the Chinese Big Dipper, Russian Glonass and European Galileo satellite navigation positioning system, Short baseline percent once in the various Ground Nuclear Magnetic Resonance navigation terminal equipment such as level hi-Fix directional terminals.
Background technology
At present, the GPS (Global Position System) of the U.S., the Beidou satellite navigation system of China, Muscovite glonass system and Europe Galileo navigation system under preparation form global four large satellite navigation system.This four Iarge-scale system can provide the location of general precision (being generally 10 meter levels), also can provide the location of high accuracy (being generally grade).The latter is mainly widely used in geodesy and association area thereof, is also widely used in the directed field of hi-Fix.And wherein antenna technology belongs to core technology, ordinary antennas can bring Centimeter Level and above error due to the instability of its phase center, cannot realize millimetre-sized superhigh precision locating and orienting.
The current satellite navigation system mainly GPS (Global Position System) of the U.S. and the dipper system of China that can realize superhigh precision locating and orienting, the existing high stable phase center antenna mainly for US Global satellite navigation system mainly comprises two kinds of forms: the micro-band laminated patch antenna adopting the many feeds of axial symmetry, as the Zephyr measurement type antenna of Trimble company; The multi-arm snail slot antenna of " Hot Wheels " technology of employing, if Novatel GPS-600 antenna.The former is by axisymmetric axial symmetry Feed Design being kept to antenna, and feed is more, and symmetry is better, and Phase center stability is higher, and when feeding network is more complicated, and bandwidth is narrower, and phase centre stability is lower, and not easily regulates; The latter ensures antenna high stable phase center by multiple around axisymmetric gap spiral arm, and feeding network adopts serial row ripple feed microstrip line circuit, and structure is comparatively simple, but its phase centre stability is lower, and not easily regulates.
Summary of the invention
The invention provides a kind of there is compact conformation, standing wave is little, axial ratio is little, axial ratio bandwidth is wide, double frequency isolation is high, phase center is overstable within the scope of broad beam, deviation in roundness is low, be easy to many feeds double frequency high-isolation wide-beam high-stability phase center antenna of the antenna regulated.
The present invention adopts following technical scheme:
A kind of many feeds double frequency high-isolation wide-beam high-stability phase center antenna, comprise: radome and for reflected signal with suppress the metal inversed taper platform pedestal of multi-path jamming, described radome is located on metal inversed taper platform pedestal, the first power splitter and the second power splitter is provided with in metal inversed taper platform pedestal, in radome and on metal inversed taper platform pedestal, be provided with the first radiating antenna be mutually superimposed and the second radiating antenna and be fixed on metal inversed taper platform pedestal by the hollow short circuit screw through the first radiating antenna and the second radiating antenna center, the first coaxial cable is provided with between the first radiating antenna and metal inversed taper platform pedestal, one end of the inner core of the first coaxial cable is connected with the radiation fin of the first radiating antenna, the other end of the inner core of the first coaxial cable is connected with the first branch road of the first power splitter, one end of the screen of the first coaxial cable is connected with the ground of the first radiating antenna, the other end of the screen of the first coaxial cable is connected with the ground of the first power splitter, between the second radiating antenna and metal inversed taper platform pedestal, be provided with the 5th coaxial cable and the 5th coaxial cable through hollow short circuit screw, one end of the inner core of the 5th coaxial cable is connected with the ground of the second radiating antenna, the other end of the inner core of the 5th coaxial cable is connected with the first branch road of the second power splitter, one end of the screen of the 5th coaxial cable is connected with the radiation fin of the second radiating antenna, and the other end of the screen of the 5th coaxial cable is connected with the ground of the second power splitter.
Compared with prior art, tool of the present invention has the following advantages:
Double-deck micro-belt substrate stepped construction is adopted to realize double frequency round polarized high-isolation high stable phase center antenna in the present invention, many feeds feed (representative value is four feeds) structure is adopted on upper strata especially for upper strata radiating antenna, feed coaxial cable traverses to metal inversed taper platform base interior by hollow metal short circuit screw inside, and then be connected respectively with the 2 one point of four power splitter four output ports, export finally by the 2 one point of four power splitter main road; Adopt many feeds feed (representative value is four feeds) structure for lower floor's radiating antenna in lower floor, four feeds are connected with the 1 one point of four power splitter four output ports respectively, export finally by the 1 one point of four power splitter main road; In this structure, because the feed inner core of upper strata radiating antenna is without the need to passing through lower floor's radiating antenna dielectric material, but pass through by central hollow short circuit screw inside, thus achieve the height isolation feed of two antennas, effectively reduce the mutual coupling between two antennas, greatly improve the standing wave of the isolation between the antenna working in two working frequency points and the radiating antenna by the 1 one point of four power splitter connection.
All inner hole wall metallization can be carried out to first medium layer, the inner all feed perforation of second dielectric layer in the present invention, the coaxial inner core of feed effectively can weld first medium layer, the inner all feed perforation of second dielectric layer, thus significantly improves feed connection reliability.
In the present invention, metal lattice is provided with to the second metal level, the 4th metal level periphery.Because high stable phase center antenna requires that all area antennas in work wave beam have consistent phase characteristic, but usually due to dielectric material processing technology reason, the dielectric constant of dielectric material itself is difficult to accomplish completely the same, therefore according to actual test result, by carrying out quarter to the metal lattice increased except regulating, improving the consistency of antenna phase center and gain pattern and reducing axial ratio index.
Adopt metal inversed taper platform pedestal in the present invention, metal mirror larger above frustum can improve the gain of antenna, the suppression that back taper structure below then can be carried out to a certain degree to the multipath signal of low elevation direction.
Accompanying drawing explanation
After reading description by reference to the accompanying drawings, above-mentioned purpose of the present invention, further feature and advantage all can be more obvious, wherein:
Fig. 1 is overall front view of the present invention.
Fig. 2 is unitary side view of the present invention.
Fig. 3 is the first metal layer vertical view of the present invention.
Fig. 4 is first medium layer vertical view of the present invention.
Fig. 5 is the second metal level vertical view of the present invention.
Fig. 6 is the 3rd metal level vertical view of the present invention.
Fig. 7 is second dielectric layer vertical view of the present invention.
Fig. 8 is the 4th metal level vertical view of the present invention.
Fig. 9 is the first antenna phase pattern of the present invention.
Figure 10 is the first antenna gain patterns of the present invention.
Figure 11 is first day bobbin specific characteristic of the present invention.
Figure 12 is the second antenna phase pattern of the present invention.
Figure 13 is the second antenna gain patterns of the present invention.
Figure 14 is the second antenna axial ratio characteristic of the present invention.
Figure 15 is the isolation of the first antenna of the present invention and the second antenna.
Figure 16 is the first power splitter schematic diagram of the present invention.
Figure 17 is the cutaway view of the first power splitter of the present invention.
Figure 18 is the second power splitter schematic diagram of the present invention.
Figure 19 is the cutaway view of the second power splitter of the present invention.
Wherein, 1 is radome, 2 is hollow metal short circuit screw, 3 is the 4th metal level, 4 is second dielectric layer, 6 is the 3rd metal level, 7 is the second metal level, 8 is first medium layer, 9 is the first metal layer, 11-1, 11-2, 11-3 and 11-4 is four feed mouths of the first antenna, 10-1, 10-2, 10-3 and 10-4 is four feed mouths of the second antenna, 12 is metal inversed taper platform pedestal, 13 is the 1 one point of four power splitter main road port, 13-1, 13-2, 13-3 and 13-4 is the 1 one point of four power splitter four tributary ports, 13-0 the 1 one point of four power splitter ground, 13-5 is the 1 one point of four power splitter medium, 13-6 is the 1 one point of four power divider network layer, 14 is the 2 one point of four power splitter main road port, 14-1, 14-2, 14-3 and 14-4 is the 2 one point of four power splitter four tributary port 14-0 the 2 one point of four power splitter ground, 14-5 is the 2 one point of four power splitter medium, 14-6 is the 2 one point of four power divider network layer.
Embodiment
A kind of many feeds double frequency high-isolation wide-beam high-stability phase center antenna, comprise: radome 1 and for reflected signal with suppress the metal inversed taper platform pedestal 12 of multi-path jamming, described radome 1 is located on metal inversed taper platform pedestal 12, the first power splitter 13 and the second power splitter 14 is provided with in metal inversed taper platform pedestal 12, in radome and on metal inversed taper platform pedestal 12, be provided with the first radiating antenna be mutually superimposed and the second radiating antenna and be fixed on metal inversed taper platform pedestal 12 by the hollow short circuit screw 2 through the first radiating antenna and the second radiating antenna center, the first coaxial cable 11-1 is provided with between the first radiating antenna and metal inversed taper platform pedestal 12, one end of the inner core of the first coaxial cable 11-1 is connected with the radiation fin of the first radiating antenna, the other end of the inner core of the first coaxial cable 11-1 is connected with the first branch road 13-1 of the first power splitter 13, one end of the screen of the first coaxial cable 11-1 is connected with the ground of the first radiating antenna, the other end of the screen of the first coaxial cable 11-1 is connected with the ground 13-0 of the first power splitter 13, between the second radiating antenna and metal inversed taper platform pedestal 12, be provided with the 5th coaxial cable 10-1 and the 5th coaxial cable 10-1 through hollow short circuit screw 2, one end of the inner core of the 5th coaxial cable 10-1 is connected with the ground of the second radiating antenna, the other end of the inner core of the 5th coaxial cable 10-1 is connected with the first branch road 14-1 of the second power splitter 14, one end of the screen of the 5th coaxial cable 10-1 is connected with the radiation fin of the second radiating antenna, and the other end of the screen of the 5th coaxial cable 10-1 is connected with the ground 14-0 of the second power splitter 14.
The first described radiating antenna forms by according to the first metal layer 9 of the superimposed setting of order from bottom to up, first medium layer 8 and the second metal level 7, and described the first metal layer 9 is the ground of the first radiating antenna, the second metal level 7 is the radiation fin of the first radiating antenna.Be provided with the first metal lattice be made up of the metal salient point be located on first medium layer 8 in the outside of the second metal level 7, the metal salient point be located on first medium layer 8 is positioned at the center of hollow short circuit screw 2 to be the center of circle circumferentially and to be uniformly distributed in circumferentially.
The second described radiating antenna forms by according to the second metal level 7 of the superimposed setting of order from bottom to up, the 3rd metal level 6, second dielectric layer 4 and the 4th metal level 3, and described second metal level 7 is the ground of the second radiating antenna, the 4th metal level 3 is the radiation fin of the second radiating antenna.Be provided with the first metal lattice be made up of the metal salient point be located in second dielectric layer 4 in the outside of the 4th metal level 3, the metal salient point be located in second dielectric layer 4 is positioned at the center of hollow short circuit screw 2 to be the center of circle circumferentially and to be uniformly distributed in circumferentially.
In the present embodiment, the second coaxial cable 11-2 is also provided with between the first radiating antenna and metal inversed taper platform pedestal 12, triaxial cable 11-3 and the 4th coaxial cable 11-4, second coaxial cable 11-2, one end of the inner core of triaxial cable 11-3 and the 4th coaxial cable 11-4 is connected with the radiation fin of the first radiating antenna respectively, second coaxial cable 11-2, the other end of the inner core of triaxial cable 11-3 and the 4th coaxial cable 11-4 respectively with the second branch road 13-2 of the first power splitter 13, 3rd branch road 13-3 and the 4th branch road 13-4 connects, second coaxial cable 11-2, one end of the screen of triaxial cable 11-3 and the 4th coaxial cable 11-4 is connected with the ground of the first radiating antenna respectively, second coaxial cable 11-2, the other end of the screen of triaxial cable 11-3 and the 4th coaxial cable 11-4 is connected with the ground 13-0 of the first power splitter 13 respectively, described first coaxial cable 11-1, second coaxial cable 11-2, triaxial cable 11-3 and the 4th coaxial cable 11-4 is that symmetry axis is symmetrical with hollow short circuit screw 2,
The 6th coaxial cable 10-2 is provided with between the second radiating antenna and metal inversed taper platform pedestal 12, 7th coaxial cable 10-3 and the 8th coaxial cable 10-4 and the 6th coaxial cable 10-2, 7th coaxial cable 10-3 and the 8th coaxial cable 10-4 is through hollow short circuit screw 2, 6th coaxial cable 10-2, one end of the inner core of the 7th coaxial cable 10-3 and the 8th coaxial cable 10-4 is connected with the ground of the second radiating antenna respectively, 6th coaxial cable 10-2, the other end of the inner core of the 7th coaxial cable 10-3 and the 8th coaxial cable 10-4 respectively with the second branch road 14-2 of the second power splitter 14, 3rd branch road 14-3 and the 4th branch road 14-4 connects, 6th coaxial cable 10-2, one end of the screen of the 7th coaxial cable 10-3 and the 8th coaxial cable 10-4 is connected with the radiation fin of the second radiating antenna respectively, 6th coaxial cable 10-2, the other end of the screen of the 7th coaxial cable 10-3 and the 8th coaxial cable 10-4 is connected with the ground 14-0 of the second power splitter 14 respectively, described 5th coaxial cable 10-1, 6th coaxial cable 10-2, 7th coaxial cable 10-3 and the 8th coaxial cable 10-4 is that symmetry axis is symmetrical with hollow short circuit screw 2.
In the present embodiment, first power splitter is one point of four power splitter, four branch roads of the first power splitter and the signal amplitude of 13-1,13-2,13-3 and 13-4 equal, signal phase is followed successively by 0 °, 90 °, 180 ° and 270 ° or phase place and is followed successively by 0 ° ,-90 ° ,-180 ° and-270 °, form four feed feed structures, realize left-hand circular polarization or right-handed circular polarization.
In the present embodiment, second power splitter is one point of four power splitter, four branch roads of the second power splitter and the signal amplitude of 14-1,14-2,14-3 and 14-4 equal, signal phase is followed successively by 0 °, 90 °, 180 ° and 270 ° or phase place and is followed successively by 0 ° ,-90 ° ,-180 ° and-270 °, form four feed feed structures, realize left-hand circular polarization or right-handed circular polarization.
Participate in the detailed content of a preferred embodiment of the present invention below, embodiment 1 in conjunction with the accompanying drawings.In the conceived case, the same label for institute's drawings attached and explanation represents same or analogous part.This embodiment is a kind of terrestrial receiving antenna for gps system, two working frequency points is L-band, are all right-handed circular polarizations, overall structure is structure as shown in Fig. 1 to Fig. 8, and its first antenna phase pattern as shown in Figure 9, first antenna gain patterns as shown in Figure 10, as shown in figure 11, wherein the elevation angle is in ± 60 beam areas for first day bobbin specific characteristic, and phase fluctuation is less than ± and 1 °, during 60 degree, the elevation angle, gain fluctuation is less than ± 0.1dB, and axial ratio is all less than 1.25dB; As shown in figure 12, as shown in figure 13, the second antenna axial ratio characteristic as shown in figure 14 for the second antenna gain patterns for second antenna phase pattern, wherein the elevation angle is in ± 60 beam areas, phase fluctuation is less than ± and 1.5 °, during 60 degree, the elevation angle, gain fluctuation is less than ± 0.12dB, and axial ratio is all less than 2.3dB; The isolation of the first antenna and the second antenna as shown in figure 15, reaches more than 23dB.In sum, the index of preferred embodiment reaches very high index, exceedes similar projects index in the world.
Although the present invention is illustrated with reference to accompanying drawing and preferred embodiment, for a person skilled in the art, the present invention can have various modifications and variations.Various change of the present invention, change, and equivalent has the content of appending claims to contain.
Claims (1)
1. the high-isolation wide-beam high-stability of feed double frequency more than kind phase center antenna, it is characterized in that, comprise: radome (1) and for reflected signal with suppress the metal inversed taper platform pedestal (12) of multi-path jamming, described radome (1) is located on metal inversed taper platform pedestal (12), the first power splitter (13) and the second power splitter (14) is provided with in metal inversed taper platform pedestal (12), in radome and on metal inversed taper platform pedestal (12), be provided with the first radiating antenna be mutually superimposed and the second radiating antenna and be fixed on metal inversed taper platform pedestal (12) by the hollow short circuit screw (2) through the first radiating antenna and the second radiating antenna center, the first coaxial cable (11-1) is provided with between the first radiating antenna and metal inversed taper platform pedestal (12), one end of the inner core of the first coaxial cable (11-1) is connected with the radiation fin of the first radiating antenna, the other end of the inner core of the first coaxial cable (11-1) is connected with first branch road (13-1) of the first power splitter (13), one end of the screen of the first coaxial cable (11-1) is connected with the ground of the first radiating antenna, the other end of the screen of the first coaxial cable (11-1) is connected with the ground (13-0) of the first power splitter (13), between the second radiating antenna and metal inversed taper platform pedestal (12), be provided with the 5th coaxial cable (10-1) and the 5th coaxial cable (10-1) through hollow short circuit screw (2), one end of the inner core of the 5th coaxial cable (10-1) is connected with the ground of the second radiating antenna, the other end of the inner core of the 5th coaxial cable (10-1) is connected with first branch road (14-1) of the second power splitter (14), one end of the screen of the 5th coaxial cable (10-1) is connected with the radiation fin of the second radiating antenna, the other end of the screen of the 5th coaxial cable (10-1) is connected with the ground (14-0) of the second power splitter (14), first radiating antenna is by the first metal layer (9) according to the superimposed setting of order from bottom to up, first medium layer (8) and the second metal level (7) composition, and described the first metal layer (9) is the ground of the first radiating antenna, second metal level (7) is the radiation fin of the first radiating antenna, the first metal lattice be made up of the metal salient point be located on first medium layer (8) is provided with in the outside of the second metal level (7), the metal salient point be located on first medium layer (8) be positioned at the center of hollow short circuit screw (2) be the center of circle circumferentially and be uniformly distributed in circumferentially, second radiating antenna is by the second metal level (7) according to the superimposed setting of order from bottom to up, 3rd metal level (6), second dielectric layer (4) and the 4th metal level (3) composition, and described second metal level (7) is the ground of the second radiating antenna, 4th metal level (3) is the radiation fin of the second radiating antenna, the first metal lattice be made up of the metal salient point be located in second dielectric layer (4) is provided with in the outside of the 4th metal level (3), the metal salient point be located in second dielectric layer (4) be positioned at the center of hollow short circuit screw (2) be the center of circle circumferentially and be uniformly distributed in circumferentially, the second coaxial cable (11-2) is also provided with between the first radiating antenna and metal inversed taper platform pedestal (12), triaxial cable (11-3) and the 4th coaxial cable (11-4), second coaxial cable (11-2), one end of the inner core of triaxial cable (11-3) and the 4th coaxial cable (11-4) is connected with the radiation fin of the first radiating antenna respectively, second coaxial cable (11-2), the other end of the inner core of triaxial cable (11-3) and the 4th coaxial cable (11-4) respectively with second branch road (13-2) of the first power splitter (13), 3rd branch road (13-3) and the 4th branch road (13-4) connect, second coaxial cable (11-2), one end of the screen of triaxial cable (11-3) and the 4th coaxial cable (11-4) is connected with the ground of the first radiating antenna respectively, second coaxial cable (11-2), the other end of the screen of triaxial cable (11-3) and the 4th coaxial cable (11-4) is connected with the ground (13-0) of the first power splitter (13) respectively, described first coaxial cable (11-1), second coaxial cable (11-2), triaxial cable (11-3) and the 4th coaxial cable (11-4) with hollow short circuit screw (2) for symmetry axis is symmetrical, the 6th coaxial cable (10-2) is provided with between the second radiating antenna and metal inversed taper platform pedestal (12), 7th coaxial cable (10-3) and the 8th coaxial cable (10-4) and the 6th coaxial cable (10-2), 7th coaxial cable (10-3) and the 8th coaxial cable (10-4) are through hollow short circuit screw (2), 6th coaxial cable (10-2), one end of the inner core of the 7th coaxial cable (10-3) and the 8th coaxial cable (10-4) is connected with the ground of the second radiating antenna respectively, 6th coaxial cable (10-2), the other end of the inner core of the 7th coaxial cable (10-3) and the 8th coaxial cable (10-4) respectively with second branch road (14-2) of the second power splitter (14), 3rd branch road (14-3) and the 4th branch road (14-4) connect, 6th coaxial cable (10-2), one end of the screen of the 7th coaxial cable (10-3) and the 8th coaxial cable (10-4) is connected with the radiation fin of the second radiating antenna respectively, 6th coaxial cable (10-2), the other end of the screen of the 7th coaxial cable (10-3) and the 8th coaxial cable (10-4) is connected with the ground (14-0) of the second power splitter (14) respectively, described 5th coaxial cable (10-1), 6th coaxial cable (10-2), 7th coaxial cable (10-3) and the 8th coaxial cable (10-4) with hollow short circuit screw (2) for symmetry axis is symmetrical.
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| CN201210264715.9A CN103022660B (en) | 2012-07-30 | 2012-07-30 | Multi-feed-source double-frequency high-separation wide-beam high-stability phase centre antennae |
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| CN103280630A (en) * | 2013-05-02 | 2013-09-04 | 苏州卡基纳斯通信科技有限公司 | Multi-frequency wide-beam circular polarization antenna |
| CN105990668A (en) * | 2015-01-30 | 2016-10-05 | 深圳光启尖端技术有限责任公司 | Antenna, antenna system and communication apparatus |
| CN104852150A (en) * | 2015-04-18 | 2015-08-19 | 江苏亨鑫科技有限公司 | Dual-frequency/dual-polarized base station antenna with parallel double line feed |
| CN107946757A (en) * | 2017-11-14 | 2018-04-20 | 西安天通电子科技有限公司 | Broadband high stability phase center anti-multipath antenna |
| CN109301467B (en) * | 2018-10-11 | 2020-04-14 | 江苏三和欣创通信科技有限公司 | Multi-satellite multi-frequency passive antenna based on stacked microstrip antenna |
| CN109387860B (en) * | 2018-12-04 | 2024-06-07 | 中电科技扬州宝军电子有限公司 | Stepped ground structure for improving phase stability of antenna |
| CN110752442A (en) * | 2019-10-16 | 2020-02-04 | 西安空间无线电技术研究所 | Wide-beam low-width-angle-to-axis-ratio circularly polarized antenna unit and radiation method thereof |
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| CN202103162U (en) * | 2011-05-18 | 2012-01-04 | 陕西海通天线有限责任公司 | Multi-feed multi-arm planar wideband printed helical antenna |
| CN102570017A (en) * | 2011-12-15 | 2012-07-11 | 东南大学 | Tri-band wide wave beam circular polarization microstrip antenna |
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| US7348933B2 (en) * | 2000-03-10 | 2008-03-25 | Wifi Plus, Inc. | Compact multi-polarized antenna for portable devices |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202103162U (en) * | 2011-05-18 | 2012-01-04 | 陕西海通天线有限责任公司 | Multi-feed multi-arm planar wideband printed helical antenna |
| CN102570017A (en) * | 2011-12-15 | 2012-07-11 | 东南大学 | Tri-band wide wave beam circular polarization microstrip antenna |
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