CN104124522B - A kind of four feed point measurement type antenna assemblies of miniaturization - Google Patents
A kind of four feed point measurement type antenna assemblies of miniaturization Download PDFInfo
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- CN104124522B CN104124522B CN201410345026.XA CN201410345026A CN104124522B CN 104124522 B CN104124522 B CN 104124522B CN 201410345026 A CN201410345026 A CN 201410345026A CN 104124522 B CN104124522 B CN 104124522B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0414—Substantially flat resonant element parallel to ground plane, e.g. patch antenna in a stacked or folded configuration
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Abstract
The invention discloses a kind of antenna assembly of four feed point measurement types of miniaturization, including：Top substrate layer, underlying substrate, suppression diameter plate, coaxial probe and signal processing circuit；Top substrate layer is connected to the upper surface of underlying substrate, suppression diameter plate is arranged along underlying substrate periphery and is connected with underlying substrate, signal processing circuit is located at the lower section of underlying substrate, the upper surface of top substrate layer is provided with upper strata paster, the upper surface of underlying substrate is provided with lower floor's paster, upper strata paster is provided with four feed points, and each feed point is connected with one end of a coaxial probe respectively.The antenna assembly be it is a kind of with miniaturization, broadband, high-gain, good axle than the device of performance measurement type dual frequency active antenna, many constellation satellite-signals such as GPS, GLONASS, the Big Dipper can be received simultaneously.Change traditional Two -- Layer Microstrip Antenna structure, realize that four feed points feed, make antenna that there is good antenna phase center stability and positioning precision.
Description
Technical field
The present invention relates to a kind of antenna assembly, and in particular to a kind of antenna assembly of four feed point measurement type of miniaturization.
Background technology
As satellite navigation can have full-time empty, round-the-clock, high accuracy, continuous offer in real time to navigate, position and award
When the characteristics of, be widely used in navigating, survey and draw, monitor, time service, the multiple fields such as communication, therefore grind in economic development, science
Study carefully, damage control and military field play more and more important effect, it is huge to national defense safety and economic construction contribution.With U.S.
State GPS ((Global Positioning System, GPS)) is the GPS (Global of representative
Navigation Satellite System, GNSS) application industry progressively become a global new high-tech industry.
With the extensive application of Satellite Navigation Technique, the antenna performance of the handset apparatus of high-acruracy survey it is also proposed
Higher and higher requirement, is mainly manifested in：
(1) good right-handed circular polarization
Gps signal is sent from space by satellite, in order to eliminate Faraday rotation effect of the ionosphere to signal,
Signal uses right-handed circular polarization, therefore, reception antenna should also adopt right-handed circular polarization mode.When gps satellite signal is by ground
After the symmetric objects reflection such as face or building, the cross-polarized signals of left-handed polarization can be become, multi-path signal is this shape mostly
Formula, so right-handed circular polarization antenna can also suppress multipath to disturb.Because there is cross polarization phenomenon in circular polarized antenna, so
Should try to improve the cross polarization rejection ability of antenna.
(2) directionality
The number of satellite that navigation neceiver can be received on ground level is The more the better, is typically required to receive 5 ° of the elevation angle
The aerial satellite-signal in all days above.Therefore, antenna will have uniform response in this space to satellite-signal, when
During less than receiving height, it is to suppress serious multipath effect and tropospheric, antenna response end rapidly.Preferably
GPS antenna has the directional diagram of near hemispherical in poincare half plane, typically requires lobe width >=120 °, and horizontal plane is attached
Near cutoff rate is more than 1dB/ degree (from -5 ° to 5 ° of the elevation angle).In the receiver using carrier phase measurement, antenna should also
To coincide with antenna geometrical center with uniform phase response, and phase center.
(3) active amplification
Navigation antenna has hemispheric directionality, therefore gain is general all very low.Antenna element is general all by reception day
Line and low-noise preamplifier composition, amplifier are generally possible to the gain of 15～35dB of offer, and many navigation antennas are directly adopted
Designed with active antenna.
(4) interior outside antenna switching
After antenna miniaturization, some degradations.When handset apparatus in seriously blocking, in the case of strong jamming even nothing
Method works.In order to solve this problem, necessary devices of the GNSS external antennas into many high-side signal receiving devices so that interior
Put, external antenna switching device applies more and more extensive on handset apparatus.
The current following defect of antenna assembly generally existing：1st, current, the frequency band of Mini Microstrip paster antenna is narrow,
Most of antennas can only receive simple signal, can only often cover the L1 frequency ranges of GPS, the G1 frequency ranges of GLONASS, or simply connect
Receive the signal of the B1 frequency ranges of the Big Dipper.At present, the reception of many constellation signals be antenna development trend, the original for causing antenna frequency band narrow
Because designing mainly due to antenna unit structure, the selection of antenna feed point position, the selection of wave filter, the design of circuit are caused.
2nd, feeding classification, most of antennas are fed by the way of SF single feed or double-fed point, and this kind of feeding classification changes antenna structure
Symmetry so that antenna phase center is not sufficiently stable, and the precision of antenna is not high enough.3rd, interior external antenna switching circuit is using micro-
Band lines matching transmission, isolation are low, larger by ectocine.A part of switching circuit adopts software controlled circuitry, operation to compare
It is loaded down with trivial details.4th, inside built-in antenna receiver, overall antenna Signal-to-Noise is relatively low, and reason is inner antenna circuit noise coefficient mistake
Greatly.
The content of the invention
In order to overcome the deficiencies in the prior art, it is an object of the invention to provide a kind of day of four feed point measurement types of miniaturization
Line apparatus, make the antenna assembly have the stable function of broadband, high-gain and phase center, can receive multiple constellations in addition
Satellite-signal, can realize the function of helping receiver quickly to position.
To solve the above problems, the technical solution adopted in the present invention is as follows：
A kind of antenna assembly of four feed point measurement types of miniaturization, including：Top substrate layer, underlying substrate, suppression diameter plate, coaxial spy
Pin and signal processing circuit, phase-shift circuit that the signal processing circuit includes being electrically connected with successively, frequency dividing circuit, filter and amplification
Circuit, alien frequencies Combining Circuit, second amplifying circuit and gain control circuit；The top substrate layer, underlying substrate, suppression diameter plate and letter
Number process circuit is arranged successively from top to bottom, and the upper surface of the top substrate layer is provided with upper strata paster, the upper surface of underlying substrate
Lower floor's paster is provided with, the upper strata paster is provided with four feed points, each feed point one end respectively with a coaxial probe
Connection, the other end of four coaxial probes sequentially pass through top substrate layer, lower floor's paster and underlying substrate and with phase shift electricity
Road is electrically connected with, and the suppression diameter plate is provided with a signal for signal processing circuit is exported and passes through cable transmission to a letter
The built-in interface of number receiver, the built-in interface are electrically connected with gain control circuit.
Four feed points are uniformly distributed on a circumference, and the center of circle of the circumference is overlapped with the midpoint of upper strata paster, respectively
Four coaxial probes are designated as into the first coaxial probe, the second coaxial probe, the 3rd coaxial probe and the 4th coaxial probe, phase shift electricity
Road includes that the first electric bridge, the second electric bridge and the 3rd electric bridge, the first coaxial probe and the second coaxial probe are electrical with the first electric bridge
Connection, the 3rd coaxial probe and the 4th coaxial probe are electrically connected with the second electric bridge, and the first electric bridge and the second electric bridge are with the
Three electric bridges are electrically connected with, and the 3rd electric bridge is electrically connected with frequency dividing circuit；
The filter amplification circuit includes the first filter amplification circuit and the second filter amplification circuit, and first filtering is put
Big circuit includes the first prefilter, the first amplifier and the first postfilter being electrically connected with successively, and the second filtering is put
Big circuit includes being electrically connected with the second prefilter, the second amplifier and the second postfilter, the first pre-filtering successively
Device and the second prefilter are electrically connected with frequency dividing circuit respectively, the first postfilter and the second postfilter respectively with
Alien frequencies Combining Circuit is electrically connected with.
The suppression diameter plate is provided with one for the external antenna interface that is connected with exterior antenna device, the signal transacting electricity
Road also includes the switching circuit of the switching for built-in aerial and external antenna, and the switching circuit includes combiner and electric current inspection
Survey control circuit, the external antenna interface and current detection control circuit electric connection, the gain control circuit and electric current
Detection control circuit is electrically connected with the input of combiner respectively, and output end and the built-in interface of combiner are electrically connected with, institute
It is electric with gain control in combiner for cutting off when detecting and having electric current in external antenna interface to state current detection control circuit
The connection on road.
The top substrate layer is connected to the upper surface of underlying substrate and in the projection of underlying substrate, the suppression diameter plate edge
Underlying substrate periphery to arrange and be connected with underlying substrate.
The periphery of the upper strata paster is provided with for adjusting frequency position with the tuning tooth block of compensating frequency deviation.
The tuning tooth block has four, and four tuning tooth blocks are uniformly distributed along the periphery of upper strata paster.
One is provided with the point midway of the upper strata paster to visit through the short-circuit of top substrate layer, lower floor's paster and underlying substrate
Pin.
The suppression diameter plate is provided with multiple suppression diameter holes for strengthening the rejection ability to multi-path signal.
The suppression diameter plate is provided with multiple for by antenna assembly hard-wired installing hole.
Compared to existing technology, the beneficial effects of the present invention is：The antenna assembly be it is a kind of have miniaturization, broadband,
The device of high-gain, good axle than performance measurement type dual frequency active antenna, can receive many stars such as GPS, GLONASS, the Big Dipper simultaneously
Seat satellite-signal.Change traditional Two -- Layer Microstrip Antenna structure, realize that four feed points feed, make antenna that there is good antenna phase
Central stabilizer degree and positioning precision.The amplifier with ultra-low noise is used, has made the noise coefficient of integrated circuit relatively low, antenna
Device has higher signal-to-noise performance.It is external in by being realized using current detection control circuit and the design of combiner
The switching of antenna, simple to operate, isolation is high, and built-in signal is not affected by lead.
Description of the drawings
Fig. 1 is the structure top view of the antenna assembly of the four feed point measurement type of miniaturization of the present invention.
Fig. 2 is the Section A-A figure in Fig. 1 of the present invention.
Fig. 3 is the circuit diagram of the antenna assembly of the four feed point measurement type of miniaturization of the present invention.
Wherein：1st, top substrate layer；2nd, underlying substrate；3rd, suppression diameter plate；4th, upper strata paster；5th, lower floor's paster；6th, built-in interface；
7th, external antenna interface；11st, the first coaxial probe；12nd, the second coaxial probe；13rd, the 3rd coaxial probe；14th, the 4th coaxial spy
Pin；21st, tune tooth block；22nd, grounding probe；23rd, suppression diameter hole；24th, installing hole；101st, the first electric bridge；102nd, the second electric bridge；103、
3rd electric bridge；104th, frequency dividing circuit；105th, alien frequencies Combining Circuit；106th, amplifier；107th, gain control circuit；108th, combining
Device；109th, current detection control circuit；201st, the first prefilter；202nd, the first amplifier；203rd, the first postfilter；
204th, the second prefilter；205th, the second amplifier；206th, the second postfilter.
Specific embodiment
Below, with reference to accompanying drawing and specific embodiment, the present invention is described further：
Fig. 1-3 shows the preferred embodiments of the present invention, a kind of antenna assembly of four feed point measurement type of miniaturization, including：
Top substrate layer 1, underlying substrate 2, suppression diameter plate 3, coaxial probe and signal processing circuit, top substrate layer 1 are connected to underlying substrate 2
Upper surface, the surface area of underlying substrate 2 are more than the midpoint of the surface area and top substrate layer 1 of top substrate layer 1 and underlying substrate 2
Midpoint overlap, suppression diameter plate 3 is arranged and is connected with underlying substrate 2 along 2 periphery of underlying substrate, and signal processing circuit is electric located at one
On the plate of road, the circuit board is located at the lower section of underlying substrate 2.Top substrate layer 1 and underlying substrate 2 select high-k, low tangent
The frequency microwave sheet material of loss angle, this microwave sheet material can cause antenna miniaturization so that be adapted to the hand for increasingly minimizing
Hold formula receiver device.
The upper surface of top substrate layer 1 is provided with upper strata paster 4, and the upper surface of underlying substrate 2 is provided with lower floor's paster 5, upper strata base
The periphery of plate 1 is provided with metal hemming edge, makes upper strata paster 4 and lower floor's paster 5 electrically conduct, and underlying substrate 2 and lower floor's paster 5 set
The frequency bandwidth that can extend the antenna assembly is put, and then many constellation satellite letters such as GPS, GLONASS, the Big Dipper can be received simultaneously
Number.
Coaxial probe has four, is designated as the first coaxial probe 11, the second coaxial probe 12, the 3rd coaxial probe 13 respectively
With the 4th coaxial probe 14, four feed points are provided with upper strata paster 4 around the midpoint of upper strata paster 4, four feed points are uniform
It is distributed on a circumference, the midpoint of circumference is overlapped with the midpoint of upper strata paster 4, four feed points connect to form square a, difference
Plated through-hole is provided with top substrate layer 1 and underlying substrate 2 vertically downward along four feed point positions, four coaxial probes are worn respectively
Four plated through-holes are crossed, one end of four coaxial probes is connected with four feed points on upper strata paster 4 respectively.The position of four feed points
Put to make the phase center of antenna assembly overlap with the geometric center of its structure with good symmetry, and then improves antenna
The Phase center stability and positioning precision of device, this is different from traditional antenna structure.The position of four feed points can produce
Double frequency satellite-signal, this satellite-signal have high-gain, the characteristics of good axle is than performance, circular polarization radiation, wherein first is same
Axle probe 11 and the second coaxial probe 12 transmit a kind of satellite-signal of frequency, the 3rd coaxial probe 13 and the 4th coaxial probe 14
The satellite-signal of another kind of frequency of transmission.
Suppression diameter plate 3 is provided with built-in interface 6, and signal processing circuit includes phase-shift circuit, the frequency dividing electricity being electrically connected with successively
Road 104, filter amplification circuit, alien frequencies Combining Circuit 105, second amplifying circuit and gain control circuit 107, wherein phase-shift circuit
Including the first electric bridge 101, the second electric bridge 102 and the 3rd electric bridge 103, filter amplification circuit includes the first filter amplification circuit and
Two filter amplification circuits, the first filter amplification circuit include the first prefilter 201, the first amplifier being electrically connected with successively
202 and first postfilter 203, the second filter amplification circuit includes being electrically connected with the second prefilter 204, second successively
Amplifier 205 and the second postfilter 206, second amplifying circuit include amplifier 106.First amplifier 202 and second is put
Big device 205 is the amplifier of ultra-low noise, and the signal to noise ratio of most of antenna assemblies is too low at present, is due to circuit inner noise
Coefficient is excessive, and the noise coefficient for reducing circuit is conducive to improving the overall signal to noise ratio of antenna, therefore the amplifying circuit of ultra-low noise
Substantially reduce the noise coefficient in circuit.
The satellite-signal transmitted by first coaxial probe 11 and the second coaxial probe 12 is designated as L1,13 He of the 3rd coaxial probe
The satellite-signal transmitted by 4th coaxial probe 14 is designated as L2, and satellite-signal L1 is input into the first electric bridge 101 and carries out phase shift, satellite
Signal L2 is input into the second electric bridge 102 and carries out phase shift, through the first electric bridge 101 and the second electric bridge 102 signal transmission to the 3rd
Electric bridge 103 carries out phase shift, and three electric bridges can carry out 90 degree of phase difference phase shifts, and above-mentioned adjacent feed point signal has 90 degree of phase places
Differ from, therefore signal phase place after the phase shift of three electric bridges is consistent.Signal from the output of the 3rd electric bridge 103 is through frequency dividing electricity
Road 104 is divided into signal A1 and signal A2 signal, and signal A1 sequentially passes through the first prefilter 201 and is filtered, and first puts
Big device 202 is amplified and is filtered with the first postfilter 203 again, is then transmit to alien frequencies Combining Circuit 105, signal A2
Sequentially pass through the second prefilter 204 to be filtered, the second amplifier 205 is amplified and enters with the second postfilter 206
Row is filtered again, is then transmit to alien frequencies Combining Circuit 105, A1 and A2 two paths of signals is combined into by alien frequencies Combining Circuit 105 to be believed all the way
Number export to amplifier 106, signal gain is adjusted by the signal input amplified through amplifier 106 to gain control circuit 107
To the gain size needed for signal receiver, transmitted to one by built-in interface 6 through the signal of the adjustment of gain control circuit 107
In signal receiver.
Further, be additionally provided with external antenna interface 7 on suppression diameter plate 3, gain control circuit 107 and built-in interface 6 it
Between increase by a switching circuit, switching circuit includes combiner 108 and current detection control circuit 109,107 He of gain control circuit
Current detection control circuit 109 is electrically connected with the input of combiner 108 respectively, and the output end of combiner 108 is connect with built-in
Mouth 6 is electrically connected with, and external antenna interface 7 is electrically connected with current detection control circuit 109.When external antenna interface 7 with it is external
After antenna assembly connection, current detection control circuit 109 just can detect external antenna interface 7 electric current, is then cut off combining
Connection in device 108 with gain control circuit 107, that is, cut off the electric current of inventive antenna device, so as to fill using external antenna
Put by built-in interface 6 to signal receiver output signal, realize the switching of external antenna device.
Further, the periphery of upper strata paster 4 is provided with tuning tooth block 21, and tuning tooth block 21 has four, four tuning teeth
Block 21 is uniformly distributed along the periphery of upper strata paster 4, and tuning tooth block 21 is used to adjust frequency position with compensating frequency deviation.
Further, the point midway in upper strata paster 4 is provided with one through top substrate layer 1, lower floor's paster 5 and underlying substrate
2 grounding probe 22, grounding probe 22 are used for extended antenna device bandwidth and increase the stability of antenna assembly.
Further, suppression diameter plate 3 is provided with multiple suppression diameter holes 23 for strengthening the rejection ability to multi-path signal, suppression
Four are additionally provided with footpath plate 3 for by antenna assembly hard-wired installing hole 24.
It will be apparent to those skilled in the art that technical scheme that can be as described above and design, make other various
It is corresponding to change and deformation, and all these change and deformation should all belong to the protection domain of the claims in the present invention
Within.
Claims (8)
1. it is a kind of miniaturization four feed point measurement types antenna assembly, it is characterised in that include：Top substrate layer, underlying substrate, suppression diameter
Plate, coaxial probe and signal processing circuit, the signal processing circuit include phase-shift circuit, the frequency dividing electricity being electrically connected with successively
Road, filter amplification circuit, alien frequencies Combining Circuit, second amplifying circuit and gain control circuit；The top substrate layer, lower floor's base
Plate, suppression diameter plate and signal processing circuit are arranged successively from top to bottom, and the upper surface of the top substrate layer is provided with upper strata paster, lower floor
The upper surface of substrate is provided with lower floor's paster, and the upper strata paster is provided with four feed points, and each feed point is described with one same respectively
One end connection of axle probe, the other end of four coaxial probes sequentially pass through top substrate layer, lower floor's paster and lower floor's base
Plate is simultaneously electrically connected with phase-shift circuit, and the suppression diameter plate is provided with a signal for signal processing circuit is exported and passes through line
Cable is transmitted to the built-in interface of a signal receiver, and the built-in interface is electrically connected with gain control circuit；
Four feed points are uniformly distributed on a circumference, and the center of circle of the circumference is overlapped with the midpoint of upper strata paster, respectively by four
Root coaxial probe is designated as the first coaxial probe, the second coaxial probe, the 3rd coaxial probe and the 4th coaxial probe, phase-shift circuit bag
The first electric bridge, the second electric bridge and the 3rd electric bridge are included, the first coaxial probe and the second coaxial probe are electrically connected with the first electric bridge,
3rd coaxial probe and the 4th coaxial probe are electrically connected with the second electric bridge, the output end of the first electric bridge and the second electric bridge with
3rd electric bridge is electrically connected with, and the 3rd electric bridge is electrically connected with frequency dividing circuit；
The filter amplification circuit includes the first filter amplification circuit and the second filter amplification circuit, the first filter and amplification electricity
Road includes the first prefilter, the first amplifier and the first postfilter being electrically connected with successively, the second filter and amplification electricity
Road includes being electrically connected with the second prefilter, the second amplifier and the second postfilter successively, the first prefilter and
Second prefilter is electrically connected with frequency dividing circuit respectively, the first postfilter and the second postfilter respectively with alien frequencies
Combining Circuit is electrically connected with.
2. it is according to claim 1 miniaturization four feed point measurement types antenna assembly, it is characterised in that on the suppression diameter plate
One is provided with for the external antenna interface that is connected with exterior antenna device, the signal processing circuit is also included for built-in aerial
With the switching circuit of the switching of external antenna, the switching circuit includes combiner and current detection control circuit, described external
Antennal interface and current detection control circuit are electrically connected with, the gain control circuit and current detection control circuit respectively with conjunction
The input of road device is electrically connected with, and output end and the built-in interface of combiner are electrically connected with, and the current detection control circuit is used
The connection with gain control circuit in combiner is cut off when having electric current in detect external antenna interface.
3. it is according to claim 1 miniaturization four feed point measurement types antenna assembly, it is characterised in that the top substrate layer
It is connected to the upper surface of underlying substrate and in the projection of underlying substrate, the suppression diameter plate is arranged simultaneously along underlying substrate periphery
It is connected with underlying substrate.
4. it is according to claim 1 miniaturization four feed point measurement types antenna assembly, it is characterised in that the upper strata paster
Periphery be provided with for adjusting frequency position with the tuning tooth block of compensating frequency deviation.
5. it is according to claim 4 miniaturization four feed point measurement types antenna assembly, it is characterised in that the tuning tooth block
With four, four tuning tooth blocks are uniformly distributed along the periphery of upper strata paster.
6. it is according to claim 1 miniaturization four feed point measurement types antenna assembly, it is characterised in that the upper strata paste
The point midway of piece is provided with a grounding probe for passing through top substrate layer, lower floor's paster and underlying substrate.
7. it is according to claim 1 miniaturization four feed point measurement types antenna assembly, it is characterised in that on the suppression diameter plate
It is provided with multiple suppression diameter holes for strengthening the rejection ability to multi-path signal.
8. it is according to claim 1 miniaturization four feed point measurement types antenna assembly, it is characterised in that on the suppression diameter plate
It is provided with multiple for by antenna assembly hard-wired installing hole.
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| CN201410345026.XA CN104124522B (en) | 2014-07-18 | 2014-07-18 | A kind of four feed point measurement type antenna assemblies of miniaturization |
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| CN201410345026.XA CN104124522B (en) | 2014-07-18 | 2014-07-18 | A kind of four feed point measurement type antenna assemblies of miniaturization |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10439266B2 (en) * | 2014-11-03 | 2019-10-08 | Amotech Co., Ltd. | Wideband patch antenna module |
| CN104882661A (en) * | 2015-06-01 | 2015-09-02 | 蒋振东 | Wide-beam circularly-polarized micro-strip antenna |
| CN105161836A (en) * | 2015-08-20 | 2015-12-16 | 广州中海达卫星导航技术股份有限公司 | Measurement-type antenna device |
| CN108110437A (en) * | 2017-12-18 | 2018-06-01 | 东莞市合康电子有限公司 | Minimize tunable GPS antenna device and its production technology |
| CN109462034B (en) * | 2018-10-12 | 2021-05-07 | 江苏三和欣创通信科技有限公司 | External multi-satellite multi-frequency measurement type antenna |
| CN109586744B (en) * | 2018-11-23 | 2020-08-18 | 天津七六四通信导航技术有限公司 | Waterproof energy-saving audio communication device |
| CN109976380A (en) * | 2019-03-29 | 2019-07-05 | 北京理工大学 | Isolation identification bearing calibration and system based on Kalman Filter Estimation |
| CN110289481A (en) * | 2019-05-29 | 2019-09-27 | 南京理工大学 | Vehicle-mounted Dual Spectral Radiation differentiation paster antenna |
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| CN202523836U (en) * | 2012-04-20 | 2012-11-07 | 王常浩 | Wideband zero-phase center antenna |
| CN202678520U (en) * | 2011-12-05 | 2013-01-16 | 上海海积信息科技有限公司 | Satellite microstrip receiving antenna for receiving frequency bands of GPS L1/L2/L5 and Beidou II B1/B2/B3 |
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| US9966661B2 (en) * | 2012-08-24 | 2018-05-08 | City University Of Hong Kong | Phased array, a coherent source array, an antenna array and a system for controlling thereof |
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| CN202678520U (en) * | 2011-12-05 | 2013-01-16 | 上海海积信息科技有限公司 | Satellite microstrip receiving antenna for receiving frequency bands of GPS L1/L2/L5 and Beidou II B1/B2/B3 |
| CN202523836U (en) * | 2012-04-20 | 2012-11-07 | 王常浩 | Wideband zero-phase center antenna |
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