CN110308440A - A kind of double antenna transmitting-receiving separation 5.8GHz moving Object Detection sensor - Google Patents
A kind of double antenna transmitting-receiving separation 5.8GHz moving Object Detection sensor Download PDFInfo
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- CN110308440A CN110308440A CN201910706668.0A CN201910706668A CN110308440A CN 110308440 A CN110308440 A CN 110308440A CN 201910706668 A CN201910706668 A CN 201910706668A CN 110308440 A CN110308440 A CN 110308440A
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- 238000001514 detection method Methods 0.000 title claims abstract description 21
- 238000000926 separation method Methods 0.000 title claims abstract description 18
- 239000000758 substrate Substances 0.000 claims abstract description 28
- 239000002184 metal Substances 0.000 claims abstract description 18
- 229910052751 metal Inorganic materials 0.000 claims abstract description 18
- 230000010355 oscillation Effects 0.000 claims abstract description 8
- 230000005855 radiation Effects 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 20
- 230000000903 blocking effect Effects 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 description 4
- 238000001465 metallisation Methods 0.000 description 4
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/003—Bistatic radar systems; Multistatic radar systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/02—Systems using reflection of radio waves, e.g. primary radar systems; Analogous systems
- G01S13/50—Systems of measurement based on relative movement of target
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
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- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Waveguide Aerials (AREA)
Abstract
The invention discloses a kind of double antennas to receive and dispatch separation 5.8GHz moving Object Detection sensor, including a medium substrate and positioned at the ground plane metal layers on one surface of medium substrate, it receives and dispatches double antenna to be located on another surface of medium substrate, is provided with receiving antenna and transmitting antenna；One circuit board is sticked on another surface of ground plane metal layers, and there are two metalized conductive via hole, via holes to be connected with the feed through-hole of antenna for setting, is etched with circuit face metal layer on another surface of circuit board；Sensor circuit is arranged on circuit boards, oscillator output signal on the sensor circuit makes the signal of half enter transmitting antenna to space radiation by a power divider, the electric bridge frequency mixer that its other half signal enters deformation does local oscillation signal, another input port of the electric bridge frequency mixer of deformation connects receiving antenna, and electric bridge frequency mixer and power divider are bent into serpentine circuit.Inventive sensor is more suitable for being mounted on fine crack space long and narrow among a plurality of LED light strip.
Description
Technical field
The present invention relates to antenna technical fields, particularly relate to a kind of double antenna transmitting-receiving separation 5.8GHz mobile object
Detection sensor.
Background technique
The main structure by the way of duplexer of the sensor of current 5.8GHz discrete device moving Object Detection
At mainly discrete device circuit cost is cheap, and circuit size is bigger, using the transmitting-receiving separated structure of conventional microstrip double antenna
Circuit keeps its volume bigger, is not suitable for being mounted on the occasion installed in some small spaces.The sensor of duplexer
Although advantageous in volume, its performance can not show a candle to receive and dispatch isolated circuit structure.
Summary of the invention
Aiming at the shortcomings in the prior art, the technical problem to be solved in the present invention is that providing a kind of double antenna transmitting-receiving point
From 5.8GHz moving Object Detection sensor.
In order to solve the above technical problems, the present invention is realized by following scheme: a kind of double antenna transmitting-receiving separation 5.8GHz
Including a medium substrate and the ground plane metal layers on one surface of medium substrate are arranged in moving Object Detection sensor,
Further include:
The transmitting-receiving double antenna on another surface of the medium substrate is set, which is provided with receiving antenna and hair
Antenna is penetrated, feed port is provided on the receiving antenna and transmitting antenna, two feed ports pass through respectively to be arranged in institute
State two feed through-holes on medium substrate and pass through the medium substrate to the back side of the medium substrate, respectively with the ground connection
Receiving port on the metal layer of face is connected with emission port, the receiving port and emission port and described states ground plane metal layers
Between be provided with isolated area to form insulation system；
Be sticked the circuit board on another surface of the ground plane metal layers, and there are two metallization VIA, two metallization for setting
Via hole is connected with the feed through-hole, is etched with circuit face metal layer on another surface of the circuit board；
One sensor circuit is arranged on the circuit board, and the oscillator output signal on the sensor circuit passes through one
Power divider makes the signal of half enter transmitting antenna to space radiation, and the electric bridge that the other half signal enters deformation is mixed
Frequency device does local oscillation signal, another input port of the electric bridge frequency mixer of the deformation connects receiving antenna, the electric bridge frequency mixer
Serpentine circuit is bent into the power divider.
Further, the sensor circuit includes being made of transistor Q1, resistance Rc, resistance Rg and an interdigital capacitor
The oscillator and capacitor C1 blocking output；
The one end the resistance Rc is connected to the collector of transistor, and the other end is electrically connected with DC power supply VDC, the electricity
Resistance one end Rg is connected to the collector of transistor, and the other end is connected to the base stage of transistor, and the interdigital capacitor resistance Rg is simultaneously
Connection, one end are connected to the collector of transistor Q1, and the other end is connected to transistor Q1 base stage, and the emitter of the transistor Q1 connects
Ground；
The one end the capacitor C1 is connected to transistor Q1 base stage, and the other end is electrically connected the first interface of the power divider
End, the second interface end of the power divider are electrically connected the transmitting antenna, and it is mixed that third interface end is electrically connected the electric bridge
The third port of frequency device and a resistance Rif, described the another of resistance Rif are terminated with medium frequency output end；
The second port of the electric bridge frequency mixer is electrically connected the receiving antenna, and first port is electrically connected with diode D1
Cathode, the positive terminal ground connection of the diode D1, the 4th port of the electric bridge frequency mixer is connected with the anode of diode D2,
The negative pole end of the diode D2 is grounded.
Further, the transistor Q1 is NPN type triode.
Further, the transistor Rc and transistor Rg constitutes the shunt voltage negative-feedback direct current biasing of oscillator
Network.
Further, the electric bridge frequency mixer is Rat-RACE electric bridge frequency mixer.
Further, an isolation resistance is connected between the second interface of the power divider and third interface.
Further, the power divider is deformation Wilkinson WILKN2 power divider, the power divider
For distribution power, one after power distribution, will be transported to all the way the transmitting antenna, and another output is mixed to the electric bridge
Device.
Further, the interdigital capacitor is MICAP1 interdigital capacitor, is used to provide microwave signal positive feedback.
Compared with the existing technology, the beneficial effects of the present invention are: double antenna transmitting-receiving separation 5.8GHz motive objects of the invention
Body detecting sensor, by designing long and narrow microstrip antenna, the size of individual antenna only has the half of conventional microstrip antenna, and leads to
The size for crossing the method decrement electric bridge frequency mixer of route bending, reaches the transmitting-receiving separated structure discrete device using double antenna
5.8GHz moving Object Detection sensor, the adjoining dimensions of volume and traditional single antenna transmit-receive sharing sensor, and it is more suitable
It closes and is mounted on fine crack space long and narrow among a plurality of LED light strip.Structure of the invention includes circuit part and transmitting-receiving double antenna.Its
Middle circuit part includes Rat-RACE electric bridge frequency mixer, the 5.8GHz oscillator of power divider, deformation.Antenna is that have transmitting-receiving two
The dielectric substrate of a Miniaturized Microstrip Antennas, circuit and antenna uses FR4 dielectric substrate, or uses other low-loss circuit bases
Sheet material.When the antenna constituted using FR4 substrate, typical patch size is 12*6mm after Miniaturization Design.Oscillator
Output signal enters transmitting antenna by power divider half and radiates to space, and half enters the Rat-RACE electricity of deformation
Bridge frequency mixer does local oscillation signal, another input port of the Rat-RACE electric bridge frequency mixer of deformation connects receiving antenna.Rat-
RACE electric bridge frequency mixer and deformation Wilkinson WILKN2 power divider are bent into serpentine.
Detailed description of the invention
Fig. 1 is the circuit diagram of double antenna of the present invention transmitting-receiving separation 5.8GHz moving Object Detection sensor.
Fig. 2 is the antenna structure view of double antenna of the present invention transmitting-receiving separation 5.8GHz moving Object Detection sensor.
Fig. 3 is that the circuit board of double antenna of the present invention transmitting-receiving separation 5.8GHz moving Object Detection sensor is connected with antenna plate
Schematic diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, enables advantages and features of the invention to be easier to be readily appreciated by one skilled in the art, thus to protection of the invention
Range is more clearly defined.Obviously, embodiment described in the invention is only a part of the embodiment of the present invention,
Instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative labor
Every other embodiment obtained under the premise of dynamic, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also indirectly connected through an intermediary, it can be with
It is the connection inside two elements, can be wireless connection, be also possible to wired connection.For those of ordinary skill in the art
For, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
As long as in addition, the non-structure each other of technical characteristic involved in invention described below different embodiments
It can be combined with each other at conflict.
Embodiment 1, specific structure of the invention are as follows:
Attached drawing 1-3 is please referred to, a kind of double antenna transmitting-receiving of the invention separates 5.8GHz moving Object Detection sensor, including
One medium substrate 4 and the ground plane metal layers 5 that 4 one surface of medium substrate is set, further includes:
The transmitting-receiving double antenna on another surface of the medium substrate 4 is set, which is provided with 1 He of receiving antenna
Transmitting antenna 2 is provided with feed port 11 on the receiving antenna 1 and transmitting antenna 2, and two feed ports 11 pass through respectively
Two feed through-holes 6 being arranged on the medium substrate 4 pass through the medium substrate 4 to the back side of the medium substrate 4, divide
Not in the ground plane metal layers 5 receiving port 51 and emission port 52 connect, the receiving port 51 and emission port
52 and described state isolated area is provided between ground plane metal layers 5 to form insulation system；
Be sticked the circuit board on another surface of the ground plane metal layers, and there are two metallization VIA, two metallization for setting
Via hole is connected with the feed through-hole, is etched with circuit face metal layer on another surface of the circuit board；
One sensor circuit is arranged on the circuit board, and the oscillator output signal on the sensor circuit passes through one
Power divider makes the signal of half enter transmitting antenna to space radiation, and the electric bridge that the other half signal enters deformation is mixed
Frequency device does local oscillation signal, another input port of the electric bridge frequency mixer of the deformation connects receiving antenna, the electric bridge frequency mixer
Serpentine circuit is bent into the power divider.
Further, the sensor circuit includes being made of transistor Q1, resistance Rc, resistance Rg and an interdigital capacitor
The oscillator and capacitor C1 blocking output；
The one end the resistance Rc is connected to the collector of transistor, and the other end is electrically connected with DC power supply VDC, the electricity
Resistance one end Rg is connected to the collector of transistor, and the other end is connected to the base stage of transistor, and the interdigital capacitor resistance Rg is simultaneously
Connection, one end are connected to the collector of transistor Q1, and the other end is connected to transistor Q1 base stage, and the emitter of the transistor Q1 connects
Ground；
The one end the capacitor C1 is connected to transistor Q1 base stage, and the other end is electrically connected the first interface of the power divider
End, the second interface end of the power divider are electrically connected the transmitting antenna, and it is mixed that third interface end is electrically connected the electric bridge
The third port of frequency device and a resistance Rif, described the another of resistance Rif are terminated with medium frequency output end；
The second port of the electric bridge frequency mixer is electrically connected the receiving antenna 1, and first port is electrically connected with diode
The cathode of D1, the positive terminal ground connection of the diode D1, the 4th port of the electric bridge frequency mixer is being connected with diode D2 just
Pole, the negative pole end ground connection of the diode D2.
A kind of optimal technical scheme of the present embodiment: the transistor Q1 is NPN type triode.
A kind of optimal technical scheme of the present embodiment: the transistor Rc and transistor Rg constitutes the parallel connection electricity of oscillator
Press negative-feedback DC bias networks.
A kind of optimal technical scheme of the present embodiment: the electric bridge frequency mixer is Rat-RACE electric bridge frequency mixer.
A kind of optimal technical scheme of the present embodiment: it is connected between the second interface and third interface of the power divider
One isolation resistance.
A kind of optimal technical scheme of the present embodiment: the power divider is deformation Wilkinson WILKN2 power distribution
Device, the power divider are used for distribution power, and one after power distribution, will be transported to all the way the transmitting antenna 2, and another way is defeated
The electric bridge frequency mixer is arrived out.
A kind of optimal technical scheme of the present embodiment: the interdigital capacitor is MICAP1 interdigital capacitor, is used to provide micro-
Wave signal positive feedback.
Embodiment 2:
The structure of double antenna transmitting-receiving separation 5.8GHz moving Object Detection sensor technology scheme of the invention includes circuit
Part and transmitting-receiving double antenna.Wherein circuit part includes power divider, the Rat-RACE electric bridge frequency mixer of deformation, 5.8GHz vibration
Swing device.Antenna is equipped with two Miniaturized Microstrip Antennas of transmitting-receiving, is transmitting antenna 2 and receiving antenna 1 respectively, circuit board and antenna plate
Dielectric substrate use FR4 dielectric substrate, or use other low-loss circuit substrate materials.When what is constituted using FR4 substrate
Antenna, typical patch size is 12*6mm after Miniaturization Design.The output signal of oscillator by power divider half into
Enter and radiated to transmitting antenna to space, the Rat-RACE electric bridge frequency mixer that half enters deformation is local oscillation signal, the rat of deformation
Another input port of electric bridge frequency mixer connects receiving antenna.Rat-RACE electric bridge frequency mixer and deformation Wilkinson WILKN2 function
Rate distributor is bent into serpentine.
Oscillator of the invention is made of transistor Q1, transistor Rc, transistor Rg and an interdigital capacitor, transistor
Rc, transistor Rg constitute the shunt voltage negative-feedback DC bias networks of oscillator, are conducive to stable operating point.
MICAP1 interdigital capacitor provides the microwave signal positive feedback of appropriate phase, enables oscillator stable oscillation stationary vibration.Oscillation
The 5.8GHz signal of device is output to deformation Wilkinson WILKN2 power divider by C1 blocking, to put it more simply, deformation Weir
The isolation resistance of the gloomy WILKN2 power divider of gold can be omitted.After power distribution, it is output to transmitting antenna 2 all the way, it is defeated all the way
The third port of Rat-RACE electric bridge frequency mixer is arrived out, receiving antenna 1 is connected to the second port of Rat-RACE electric bridge frequency mixer,
First port and the 4th port respectively connect diode to ground, and two diode directions are reversed, the diodes of reverse geometry
Unwanted combination frequency can be reduced, difference frequency part is left behind and is exported by intermediate frequency port, since IF signal frequency is low,
The electric bridge frequency mixer any position Rat-RACE passes through resistance or the output of inductance or high resistant microstrip line.
The foregoing is merely the preferred embodiment of the present invention, are not intended to limit the scope of the invention, all benefits
The equivalent structure or equivalent flow shift made by description of the invention and accompanying drawing content is applied directly or indirectly in other phases
The technical field of pass, is included within the scope of the present invention.
Claims (8)
1. a kind of double antenna transmitting-receiving separation 5.8GHz moving Object Detection sensor, including a medium substrate (4) and setting exist
The ground plane metal layers (5) on (4) one surface of medium substrate, which is characterized in that further include:
Transmitting-receiving double antenna on the medium substrate (4) another surface is set, the transmitting-receiving double antenna be provided with receiving antenna (1) and
Transmitting antenna (2) is provided with feed port (11) on the receiving antenna (1) and transmitting antenna (2), two feed ports
(11) medium substrate (4) are passed through described in by two feed through-holes (6) being arranged on the medium substrate (4) respectively
The back side of medium substrate (4), respectively on the ground plane metal layers (5) receiving port (51) and emission port (52) even
It connects, the receiving port (51) and emission port (52) and described state are provided with isolated area between ground plane metal layers (5) with shape
At insulation system；
The circuit board on the ground plane metal layers that are sticked (5) another surface, there are two via hole, two via holes and the feeds for setting
Through-hole (6) is coaxial aperture, is etched with circuit face metal layer (8) on another surface of the circuit board；
One sensor circuit is arranged on the circuit board, and the oscillator output signal on the sensor circuit passes through a power
Distributor makes the signal of half enter transmitting antenna (2) to space radiation, and the electric bridge that the other half signal enters deformation is mixed
Frequency device does local oscillation signal, another input port of the electric bridge frequency mixer of the deformation connects receiving antenna (1), the electric bridge mixing
Device and the power divider are bent into serpentine circuit.
2. a kind of double antenna transmitting-receiving separation 5.8GHz moving Object Detection sensor according to claim 1, feature exist
In: the sensor circuit includes the oscillator being made of transistor Q1, resistance Rc, resistance Rg and an interdigital capacitor,
And capacitor C1 blocking output；
The one end the resistance Rc is connected to the collector of transistor, and the other end is electrically connected with DC power supply VDC, the resistance Rg
One end is connected to the collector of transistor, and the other end is connected to the base stage of transistor, and the interdigital capacitor resistance Rg is in parallel, and one
End is connected to the collector of transistor Q1, and the other end is connected to transistor Q1 base stage, the emitter ground connection of the transistor Q1；
The one end the capacitor C1 is connected to transistor Q1 base stage, and the other end is electrically connected the first interface end of the power divider,
The second interface end of the power divider is electrically connected the transmitting antenna (2), and it is mixed that third interface end is electrically connected the electric bridge
The third port of frequency device and a Rif resistance, described the another of Rif resistance are terminated with medium frequency output end；
The second port of the electric bridge frequency mixer is electrically connected the receiving antenna (1), and first port is electrically connected with diode D1
Cathode, the positive terminal ground connection of the diode D1, the 4th port of the electric bridge frequency mixer is connected with the anode of diode D2,
The negative pole end of the diode D2 is grounded.
3. a kind of double antenna transmitting-receiving separation 5.8GHz moving Object Detection sensor according to claim 2, feature exist
In: the transistor Q1 is NPN type triode.
4. a kind of double antenna transmitting-receiving separation 5.8GHz moving Object Detection sensor according to claim 2, feature exist
In: the transistor Rc and transistor Rg constitutes the shunt voltage negative-feedback DC bias networks of oscillator.
5. a kind of double antenna transmitting-receiving separation 5.8GHz moving Object Detection sensor according to claim 2, feature exist
In: the electric bridge frequency mixer is Rat-RACE electric bridge frequency mixer.
6. a kind of double antenna transmitting-receiving separation 5.8GHz moving Object Detection sensor according to claim 2, feature exist
In: an isolation resistance is connected between the second interface and third interface of the power divider.
7. a kind of double antenna transmitting-receiving separation 5.8GHz moving Object Detection sensor according to claim 2, feature exist
In: the power divider is deformation Wilkinson WILKN2 power divider, which is used for distribution power, one
It after power distribution, is transported to all the way the transmitting antenna (2), another output to the electric bridge frequency mixer.
8. a kind of double antenna transmitting-receiving separation 5.8GHz moving Object Detection sensor according to claim 2, feature exist
In: the interdigital capacitor is MICAP1 interdigital capacitor, is used to provide microwave signal positive feedback.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910706668.0A CN110308440A (en) | 2019-08-01 | 2019-08-01 | A kind of double antenna transmitting-receiving separation 5.8GHz moving Object Detection sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910706668.0A CN110308440A (en) | 2019-08-01 | 2019-08-01 | A kind of double antenna transmitting-receiving separation 5.8GHz moving Object Detection sensor |
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| CN110308440A true CN110308440A (en) | 2019-10-08 |
Family
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| CN201910706668.0A Pending CN110308440A (en) | 2019-08-01 | 2019-08-01 | A kind of double antenna transmitting-receiving separation 5.8GHz moving Object Detection sensor |
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|---|---|---|---|---|
| KR20060085031A (en) * | 2005-01-21 | 2006-07-26 | (주)지컨 | Patch type dual antenna |
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| CN103296425A (en) * | 2012-02-29 | 2013-09-11 | 深圳光启创新技术有限公司 | Antenna device |
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| CN104300214A (en) * | 2014-08-22 | 2015-01-21 | 江苏本能科技有限公司 | Double-feed-point circular polarization microstrip antenna |
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-
2019
- 2019-08-01 CN CN201910706668.0A patent/CN110308440A/en active Pending
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| KR20060085031A (en) * | 2005-01-21 | 2006-07-26 | (주)지컨 | Patch type dual antenna |
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| Title |
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