CN103579783A - Vehicle-mounted reader-writer antenna - Google Patents
Vehicle-mounted reader-writer antenna Download PDFInfo
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- CN103579783A CN103579783A CN201210254597.3A CN201210254597A CN103579783A CN 103579783 A CN103579783 A CN 103579783A CN 201210254597 A CN201210254597 A CN 201210254597A CN 103579783 A CN103579783 A CN 103579783A
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Abstract
The invention discloses a vehicle-mounted reader-writer antenna which comprises an integrated structure formed by combining four small yagi antenna bodies in an orthogonal mode in pairs, the four yagi antenna bodies share a support fixing piece and are respectively connected with a vehicle-mounted reader-writer through coaxial cables, and the overall structure of the interior of the antenna is a cross symmetrical structure. According to the vehicle-mounted reader-writer antenna, the integrated structure formed by the four yagi antenna bodies has large gain, and the drawback of an electronic tag for reading blind spots with regard to a directional antenna is successfully avoided; besides, the vehicle-mounted reader-writer antenna has an omnidirectional horizontal radiation pattern, so that the requirement that omnidirectional scanning is achieved at the same time point is satisfied.
Description
Technical field
The present invention relates to field of antenna, relate in particular to a kind of vehicle-mounted reading and writing device antenna.
Background technology
In recent years, along with socioeconomic fast development, the increasing rapidly of vehicles number, it is more and more busier that highway transportation becomes.The contradiction of traffic administration present situation and demand is further aggravated, and the criminal and case involving public security relevant to traffic also rises year by year.In the case, how to utilize advanced technological means, strengthen public security management department to entering the check and control dynamics of the motor vehicle at road junction, for hitting all kinds of criminal offences, provide technological means ，Shi public safety traffic management department problem demanding prompt solution.
For effective containment vehicle personation car plate and the act of violating regulations such as annual test not, control, reduce road traffic accident, RFID(Radio Frequency Identification is installed on police car, radio-frequency (RF) identification) read-and-write device, the public vehicles of police car all installation electronic tags are around identified to ，Shi public safety traffic management department automatically and motor vehicle is carried out to a kind of effective means of dynamic management and control.
The vehicle-mounted reading and writing device antenna of existing police car adopts directional antenna+turntable compound mode more, and within a period of time, vehicle-mounted reading and writing device antenna can be with whole circumferential area in the rotary scanning horizontal plane of turntable.
The shortcoming of the vehicle-mounted read write line of above-mentioned existing police car is: due to the introducing of the equipment such as turntable, strengthened equipment investment cost, and vehicle-mounted reading and writing device antenna can not be put the demand that reaches omnidirectional's scanning at one time.
Summary of the invention
The invention provides a kind of vehicle-mounted reading and writing device antenna, to solve existing vehicle-mounted reading and writing device antenna, can not put at one time the problem that reaches omnidirectional's scanning.
A reading and writing device antenna, comprising:
Support unit 5-1,5-2,5-3, wherein, support unit 5-1 and support unit 5-2 planche cross intersect, form cross structure, support unit 5-3 vertically places with respect to described cross structure, the top of support unit 5-3 is fixedly connected with the center of described cross structure, and described cross structure is supported;
Radiating element 3-1,3-2,3-3,3-4, be separately positioned on 4 linking arms of described cross structure, and the radio frequency discrimination RFID electromagnetic signal sending for receive vehicle-mounted read write line by coaxial cable and feed port, outwards launches described RFID electromagnetic signal; Receive the response signal that exterior vehicle vehicle carried electronic label returns, by coaxial cable and feed port, described response signal is sent to vehicle-mounted read write line;
Feed port 1-1,1-2,1-3,1-4, be arranged on the bottom of described support unit 5-3, described feed port 1-1 and the distributing point of the distributing point of the distributing point of radiating element 3-1, described feed port 1-2 and radiating element 3-2, described feed port 1-2 and radiating element 3-2, described feed port 1-4 and the distributing point of radiating element 3-4 are connected by coaxial cable; Described feed port 1-1,1-2,1-3,1-4 are also connected with vehicle-mounted read write line by coaxial cable;
Coaxial cable 6, lays along described support unit 5-1,5-2,5-3, and respectively with radiating element 3-1,3-2,3-3,3-4, feed port 1-1,1-2,1-3,1-4, and vehicle-mounted read write line connects.
As seen from the above technical solution provided by the invention, when four-Yagi antenna integral structure of vehicle-mounted reading and writing device antenna of the present invention has larger gain, the electronic tag of successfully having avoided directional antenna existence reads the drawback of blind spot, the antenna pattern that has possessed the horizontal direction of omnidirectional, has met the demand that reaches at one time omnidirectional's scanning.
Accompanying drawing explanation
Fig. 1 is the structure chart of vehicle-mounted reading and writing device antenna of the present invention;
Fig. 2 is the top view of antenna fixing holder of the present invention;
Fig. 3 is the structural representation of the car antenna after a kind of encapsulation of the present invention.
Embodiment
Present RFID(Radio Frequency Identification, radio-frequency (RF) identification) more and more extensive in the application of Internet of Things field, car networking is an important branch of Internet of Things, RFID is also more and more extensive in the application of car networking.
The present invention proposes a kind of vehicle-mounted reading and writing device antenna of the RFID of possessing function, as shown in Figure 1, the top of Fig. 1 is divided into the main body plan structure of vehicle-mounted reading and writing device antenna to the structure of above-mentioned reading and writing device antenna, and bottom is divided into the end view of vehicle-mounted reading and writing device antenna.Above-mentioned vehicle-mounted reading and writing device antenna comprises that 4 antennas that are combined into by radiating element, reflector element, adjunct unit, support unit and coaxial cable are respectively individual, specifically consists of the following components:
Support unit 5-1,5-2,5-3, wherein, support unit 5-1 and 5-2 planche cross intersect, form cross structure, the vertical placement of cross structure that support unit 5-3 forms with 5-2 with respect to above-mentioned support unit 5-1, the top of support unit 5-3 is fixedly connected with the center of above-mentioned cross structure, thereby above-mentioned cross structure is supported.
Radiating element 3-1,3-2,3-3,3-4, be separately positioned on 4 linking arms of above-mentioned cross structure, in order to reduce antenna arm, take up space, radiating element adopts folded dipole structure, and with respect to standard dipole antenna, two arm lengths are approximately half wavelength, in order to reduce antenna, take up space, generally antenna ends doubling, i.e. so-called folded dipole structure, two arm lengths can reduce to quarter-wave.As aerial radiation main body, radiating element receives by coaxial cable and feed port the RFID electromagnetic signal that vehicle-mounted read write line sends, and outwards launches described RFID electromagnetic signal; Receive the response signal that exterior vehicle vehicle carried electronic label returns, and by coaxial cable and feed port, described response signal is sent to vehicle-mounted read write line.
Feed port 1-1,1-2,1-3,1-4, be arranged on the bottom of described support unit 5-3, described feed port 1-1 and the distributing point of the distributing point of the distributing point of radiating element 3-1, described feed port 1-2 and radiating element 3-2, described feed port 1-2 and radiating element 3-2, described feed port 1-4 and the distributing point of radiating element 3-4 are connected by coaxial cable; Described feed port 1-1,1-2,1-3,1-4 are also connected with vehicle-mounted read write line by coaxial cable;
Reflector element 2-1,2-2,2-3,2-4, be separately positioned on 4 linking arms of above-mentioned cross structure, reflector element 2-1 is arranged between radiating element 3-1 and the central point of above-mentioned cross structure, reflector element 2-2 is arranged between radiating element 3-2 and the central point of above-mentioned cross structure, reflector element 2-3 is arranged between radiating element 3-3 and the central point of above-mentioned cross structure, and reflector element 2-4 is arranged between radiating element 3-4 and the central point of above-mentioned cross structure.Reflector element can reflected radiation unit backward electromagnetic wave, the qualitative radiation of single Yagi antenna that radiating element, reflector element and auxiliary unit are formed, also can reduce in addition the impact of reading and writing device antenna rear structure on antenna performance, strengthen the radiation direction gain of reading and writing device antenna simultaneously.
Adjunct unit 4-1,4-2,4-3,4-4, be separately positioned on 4 linking arms of above-mentioned cross structure, wherein, adjunct unit 4-1 is connected with the distributing point of radiating element 3-1, adjunct unit 4-2 is connected with the distributing point of radiating element 3-2, adjunct unit 4-3 is connected with the distributing point of radiating element 3-3, and adjunct unit 4-4 is connected with the distributing point of radiating element 3-4.Adjunct unit 4-1,4-2,4-3,4-4 are by each distributing point place and connect one section of U-shaped conductor, adjust the distributing point port Impedance of radiating element 3-1,3-2,3-3,3-4, making the impedance of each distributing point port Impedance and cable 6 consistent is 50 ohm, reduces standing wave; The balanced structure that simultaneously changes each distributing point is non-equilibrium structure, and is connected to read write line unit by cable 6 with each feed port 1-1,1-2,1-3,1-4, does not change the radiation characteristic of radiating element 3-1,3-2,3-3,3-4.
Coaxial cable 6, lays along described support unit 5-1,5-2,5-3, respectively with radiating element 3-1,3-2,3-3,3-4, feed port 1-1,1-2,1-3,1-4, and adjunct unit 4-1,4-2,4-3,4-4, and vehicle-mounted read write line connects.
Radome 7, in order to protect antenna structure, at antenna external load radome, radome form can be diversified, and streamlined structure, during high vehicle speeds, can effectively reduce air drag as shown in Figure 1; Another aerial radiation main body should be loaded warning lamp height higher than police car, to reduce the impact of warning lamp on antenna performance.The described radome multiselect rigid plastic material less to electromagnetic field performance impact, as ABS etc., space resin filling between inside antenna and radome.
Above-mentioned radiating element, reflector element, adjunct unit and support unit form whole antenna frame, the organic connection in each unit, and be metal quality, such as aluminum pipe etc.
Four feeder lines of reading and writing device antenna of the present invention lead to the support unit 5-3 of hollow from the distributing point of four radiating elements, after inner assembly, from the bottom of support unit 5-3, by four feed port, draw, four ports last and vehicle-mounted read write line join respectively.
Reading and writing device antenna of the present invention can be regarded the integral structure of four individual pairwise orthogonal combinations of small-sized Yagi antenna as, and four antenna duplexers prop up supporting piece, and antenna inner body framework is right-angled intersection symmetrical structure.Described radiating element 3-1, reflector element 2-1, adjunct unit 4-1 form the first Yagi antenna, described radiating element 3-2, reflector element 2-2, adjunct unit 4-2 and form the second Yagi antenna, described radiating element 3-3, reflector element 2-3, adjunct unit 4-3 and form the 3rd Yagi antenna, described radiating element 3-4, reflector element 2-4, adjunct unit 4-4 and forms the 4th Yagi antenna, the supporting construction of described the first Yagi antenna, the second Yagi antenna, the 3rd Yagi antenna, the 4th Yagi antenna common support unit 5-1,5-2,5-3 formation.
The first Yagi antenna that radiating element 3-1, reflector element 2-1, adjunct unit 4-1 form of take is example, by adjusting radiating element 3-1, the length of reflector element 2-1 and the spacing between Unit two, adjusts the operating frequency of the first Yagi antenna.For Yagi antenna, two arm lengths of radiating element 3-1 have determined the operating efficiency of antenna, and radiating element generally adopts straight oscillator or folded dipole structure, and the length of straight oscillator is generally 1/2 wavelength, folded dipole is its distortion, and length can be reduced to 1/4 wavelength.The length of reflector element 2-1 is slightly larger than half-wavelength, situation when concrete length can be used according to reality and determining.Reflector element 2-1 is positioned at 1/4 wavelength place, radiating element 3-1 rear, and the induced electromotive force of reflector element 2-1 on radiating element 3-1 be with the induced electromotive force homophase of radiating element 3-1 self, the two enhancing that superposes.Particularly, car antenna operating frequency is 920MHz～925MHz, and its wavelength is approximately 32cm, therefore radiating element 3-1 horizontal length is about 8cm, and the length of reflector element 2-1 is a bit larger tham 16cm, between the two apart from being about 8cm.
By adjusting adjunct unit 4-1, adjust impedance and the directivity of the first Yagi antenna.A key character of antenna, is exactly input impedance, and in resonance condition, antenna is connected on feeder line end as same resistance.Conventional feed line impedance is 50 ohm, if antenna impedance is also 50 ohm, that has just reached coupling, and the electromagnetic wave of read write line output just can all be launched from antenna; If do not mated, a part of power will be reflected back read write line.The input impedance of 1/2nd wavelength dipole antennas is about 67 ohm, the input impedance of 1/2nd wavelength folded dipoles higher than the former 4 times.After introducing reflector element, it is more complicated that impedance relationship just becomes.Yagi antenna is balance output, distributing point presents identical characteristic over the ground, but common transceiver antenna port is unbalanced, if the heart yearn of feeder cable 6 is arbitrarily connected on antenna feed point, another distributing point connects cable outer conductor layer, this will destroy the original directional characteristic of antenna, and on feeder cable 6, produce unnecessary transmitting.Adjunct unit 4-1 is at feed place and connect one section of U-shaped conductor, adjusts radiating element 3-1 port Impedance, also plays " balanced-unbalanced " (being Ba Lun) transformation simultaneously.
The specificity analysis of operating frequency, impedance and the directivity of above-mentioned the second Yagi antenna, the 3rd Yagi antenna, the 4th Yagi antenna is identical with above-mentioned the first Yagi antenna.That is:
By adjusting radiating element 3-2, the length of reflector element 2-2 and the spacing between Unit two, adjust the operating frequency of the second Yagi antenna.By adjusting adjunct unit 4-2, adjust impedance and the directivity of the second Yagi antenna.
By adjusting radiating element 3-3, the length of reflector element 2-3 and the spacing between Unit two, adjust the operating frequency of the 3rd Yagi antenna.By adjusting adjunct unit 4-3, adjust impedance and the directivity of the 3rd Yagi antenna.
By adjusting radiating element 3-4, the length of reflector element 2-4 and the spacing between Unit two, adjust the operating frequency of the 4th Yagi antenna.By adjusting adjunct unit 4-4, adjust impedance and the directivity of the 4th Yagi antenna.
With respect to the Yagi antenna of standard, the horizontal lobe angle of above-mentioned first, second and third and four Yagi antennas increases to 70 degree, and gain is about 5dBi, has strengthened electromagnetic field coverage when sacrificing gain.Due to the design feature of Yagi antenna, the adding of single Yagi antenna left and right and rear same individual antenna, on individual antenna body radiation direction performance impact is limited separately, on the contrary, 45 degree angle directions between adjacent body antenna, electromagnetic field stack, demonstrates stronger radiation characteristic.Be 45 degree angle directions between 45 degree angle directions, the 3rd Yagi antenna and the 4th Yagi antenna between 45 degree angle directions, the second Yagi antenna and the 3rd Yagi antenna between above-mentioned the first Yagi antenna, the second Yagi antenna, and the electromagnetic fields of the 4th 45 degree angle directions between Yagi antenna and the first Yagi antenna superpose mutually, make the antenna pattern sub-circular of the horizontal direction of reading and writing device antenna system of the present invention, radiation-curable police car peripheral regions, sphere of action is larger.
As shown in Figure 2, described vehicle-mounted reading and writing device antenna can be installed on the top of the vehicles such as police car, by radio frequency cable, is connected with vehicle-mounted read write line, and this read write line can be fixed on roof, or is placed in car.Described vehicle-mounted reading and writing device antenna has broadband character, functional in 860MHz～960MHz frequency band range, can be furnished with for the supervise and examine of police car electronics the public vehicles of electronic tag.
Fig. 3 is the structural representation of the car antenna after a kind of encapsulation that the present invention provides, and larger area radome base contributes to reduce main body center of gravity, by screw and police car roof, joins, and improves the steadiness of antenna body.
One of ordinary skill in the art will appreciate that: accompanying drawing is the schematic diagram of an embodiment, the parts in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
One of ordinary skill in the art will appreciate that: the parts in device of the present invention can be described and be distributed in the device of embodiment according to embodiment, also can carry out respective change and be arranged in the one or more devices that are different from the present embodiment.Above-described embodiment can be merged into parts, also can further split into a plurality of subassemblies.
In sum, when four-Yagi antenna integral structure of vehicle-mounted reading and writing device antenna of the present invention has larger gain, the electronic tag of successfully having avoided directional antenna existence reads the drawback of blind spot, the antenna pattern that has possessed the horizontal direction of omnidirectional, met the demand that reaches at one time omnidirectional's scanning, radiation-curable inspection vehicle's surroundings region, sphere of action is larger.
The structure compact of vehicle-mounted reading and writing device antenna of the present invention, does not relate to the valuable mechanical devices such as turntable, time with low cost, can to front and back to and neighboring trace vehicle effectively identify, antenna gain is moderate, and identification range is larger, meets the performance requirement of police car onboard system.
Vehicle-mounted reading and writing device antenna of the present invention coordinates BAP(Battery-Assisted Passive tag, battery auxiliary electron label) can stablize and read apart from 40 meters of police cars with the interior normal driving vehicle of adjacent multilane.With respect to prior art, vehicle-mounted reading and writing device antenna system of the present invention, when reducing equipment cost, has improved police car identification vehicle scope, the illegal public vehicles of more efficiently supervise and examine greatly.
The above; be only the present invention's embodiment preferably, but protection scope of the present invention is not limited to this, is anyly familiar with in technical scope that those skilled in the art disclose in the present invention; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (9)
1. a vehicle-mounted reading and writing device antenna, is characterized in that, comprising:
Support unit 5-1,5-2,5-3, wherein, support unit 5-1 and support unit 5-2 planche cross intersect, form cross structure, support unit 5-3 vertically places with respect to described cross structure, the top of support unit 5-3 is fixedly connected with the center of described cross structure, and described cross structure is supported;
Radiating element 3-1,3-2,3-3,3-4, be separately positioned on 4 linking arms of described cross structure, and the radio frequency discrimination RFID electromagnetic signal sending for receive vehicle-mounted read write line by coaxial cable and feed port, outwards launches described RFID electromagnetic signal; Receive the response signal that exterior vehicle vehicle carried electronic label returns, by coaxial cable and feed port, described response signal is sent to vehicle-mounted read write line;
Feed port 1-1,1-2,1-3,1-4, be arranged on the bottom of described support unit 5-3, described feed port 1-1 and the distributing point of the distributing point of the distributing point of radiating element 3-1, described feed port 1-2 and radiating element 3-2, described feed port 1-2 and radiating element 3-2, described feed port 1-4 and the distributing point of radiating element 3-4 are connected by coaxial cable; Described feed port 1-1,1-2,1-3,1-4 are also connected with vehicle-mounted read write line by coaxial cable;
Coaxial cable 6, lays along described support unit 5-1,5-2,5-3, and respectively with radiating element 3-1,3-2,3-3,3-4, feed port 1-1,1-2,1-3,1-4, and vehicle-mounted read write line connects.
2. vehicle-mounted reading and writing device antenna according to claim 1, is characterized in that, described vehicle-mounted reading and writing device antenna system also comprises:
Reflector element 2-1, 2-2, 2-3, 2-4, be separately positioned on 4 linking arms of described cross structure, reflector element 2-1 is arranged between radiating element 3-1 and the central point of above-mentioned cross structure, reflector element 2-2 is arranged between radiating element 3-2 and the central point of above-mentioned cross structure, reflector element 2-3 is arranged between radiating element 3-3 and the central point of above-mentioned cross structure, reflector element 2-4 is arranged between radiating element 3-4 and the central point of above-mentioned cross structure, reflector element 2-1, 2-2, 2-3, 2-4 is respectively used to reflected radiation unit 3-1, 3-2, 3-3, the backward electromagnetic wave of 3-4.
3. vehicle-mounted reading and writing device antenna according to claim 1, is characterized in that, described vehicle-mounted reading and writing device antenna also comprises:
Adjunct unit 4-1,4-2,4-3,4-4, be separately positioned on 4 linking arms of described cross structure, adjunct unit 4-1,4-2,4-3,4-4 are connected with the distributing point of radiating element 3-1,3-2,3-3,3-4 respectively, adjunct unit 4-1,4-2,4-3,4-4, by each distributing point place and connect conductor and adjust each distributing point port Impedance, make each distributing point port Impedance consistent with the impedance of cable; Adjunct unit 4-1,4-2,4-3,4-4 are also connected to vehicle-mounted read write line by cable, and the balanced structure that changes the distributing point of radiating element 3-1,3-2,3-3,3-4 is non-equilibrium structure, does not change the radiation characteristic of radiating element 3-1,3-2,3-3,3-4.
4. vehicle-mounted reading and writing device antenna according to claim 1, is characterized in that, described vehicle-mounted reading and writing device antenna also comprises:
Radome, is arranged on antenna outside, the space resin filling between described radome and the reading and writing device antenna of inside.
5. vehicle-mounted reading and writing device antenna according to claim 1, is characterized in that, described radiating element 3-1,3-2,3-3,3-4 adopt folded dipole structure.
6. according to the vehicle-mounted reading and writing device antenna described in claim 1 to 5 any one, it is characterized in that, described radiating element 3-1, reflector element 2-1, adjunct unit 4-1 forms the first Yagi antenna, described radiating element 3-2, reflector element 2-2, adjunct unit 4-2 forms the second Yagi antenna, described radiating element 3-3, reflector element 2-3, adjunct unit 4-3 forms the 3rd Yagi antenna, described radiating element 3-4, reflector element 2-4, adjunct unit 4-4 forms the 4th Yagi antenna, described the first Yagi antenna, the second Yagi antenna, the 3rd Yagi antenna, the qualitative radiation of the 4th Yagi antenna, and common support unit 5-1, 5-2, the supporting construction that 5-3 forms.
7. vehicle-mounted reading and writing device antenna according to claim 6, is characterized in that, by adjusting radiating element 3-1, the length of reflector element 2-1 and the spacing between radiating element 3-1, reflector element 2-1, adjusts the operating frequency of described the first Yagi antenna;
By adjusting radiating element 3-2, the length of reflector element 2-2 and the spacing between radiating element 3-2, reflector element 2-2, adjust the operating frequency of described the second Yagi antenna;
By adjusting radiating element 3-3, the length of reflector element 2-3 and the spacing between radiating element 3-3, reflector element 2-3, adjust the operating frequency of described the 3rd Yagi antenna;
By adjusting radiating element 3-4, the length of reflector element 2-4 and the spacing between radiating element 3-4, reflector element 2-4, adjust the operating frequency of described the 4th Yagi antenna.
8. vehicle-mounted reading and writing device antenna according to claim 6, is characterized in that,
By adjusting adjunct unit 4-1, adjust return loss and the directivity of described the first Yagi antenna;
By adjusting adjunct unit 4-2, adjust return loss and the directivity of described the second Yagi antenna;
By adjusting adjunct unit 4-3, adjust return loss and the directivity of described the 3rd Yagi antenna;
By adjusting adjunct unit 4-4, adjust return loss and the directivity of described the 4th Yagi antenna.
9. vehicle-mounted reading and writing device antenna according to claim 6, it is characterized in that, 45 degree angle directions between 45 degree angle directions, the 3rd Yagi antenna and the 4th Yagi antenna between 45 degree angle directions, the second Yagi antenna and the 3rd Yagi antenna between described the first Yagi antenna, the second Yagi antenna, and the electromagnetic fields of the 4th 45 degree angle directions between Yagi antenna and the first Yagi antenna superpose mutually, make the antenna pattern of the horizontal direction of described reading and writing device antenna system be approximately circular.
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| CN201210254597.3A CN103579783B (en) | 2012-07-20 | 2012-07-20 | Vehicle-mounted reading and writing device antenna |
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| CN201210254597.3A CN103579783B (en) | 2012-07-20 | 2012-07-20 | Vehicle-mounted reading and writing device antenna |
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Cited By (6)
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|---|---|---|---|---|
| CN103928750A (en) * | 2014-04-08 | 2014-07-16 | 陈昊 | Superhigh-frequency radio frequency identification micro-strip conformal yagi antenna |
| CN104085358A (en) * | 2014-07-10 | 2014-10-08 | 陈昊 | Radio frequency identification reader-writer and antenna vehicle-mounted device |
| CN104538738A (en) * | 2014-05-06 | 2015-04-22 | 康凯科技（杭州）有限公司 | Switchable antenna applied to wireless communication |
| CN106911012A (en) * | 2017-04-01 | 2017-06-30 | 华侨大学 | A kind of high-gain reading and writing device antenna of fitting room rfid system |
| CN111029716A (en) * | 2019-12-19 | 2020-04-17 | 重庆壹城桥慧科技有限公司 | RFID antenna device |
| CN114492483A (en) * | 2020-10-28 | 2022-05-13 | Apulse技术株式会社 | Portable RFID reader device including crossed yagi antenna |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103928750A (en) * | 2014-04-08 | 2014-07-16 | 陈昊 | Superhigh-frequency radio frequency identification micro-strip conformal yagi antenna |
| CN104538738A (en) * | 2014-05-06 | 2015-04-22 | 康凯科技（杭州）有限公司 | Switchable antenna applied to wireless communication |
| CN104538738B (en) * | 2014-05-06 | 2018-12-04 | 康凯科技（杭州）股份有限公司 | applied to the switchable antenna in wireless communication |
| CN104085358A (en) * | 2014-07-10 | 2014-10-08 | 陈昊 | Radio frequency identification reader-writer and antenna vehicle-mounted device |
| CN106911012A (en) * | 2017-04-01 | 2017-06-30 | 华侨大学 | A kind of high-gain reading and writing device antenna of fitting room rfid system |
| CN106911012B (en) * | 2017-04-01 | 2023-03-31 | 华侨大学 | High-gain reader-writer antenna of fitting room RFID system |
| CN111029716A (en) * | 2019-12-19 | 2020-04-17 | 重庆壹城桥慧科技有限公司 | RFID antenna device |
| CN114492483A (en) * | 2020-10-28 | 2022-05-13 | Apulse技术株式会社 | Portable RFID reader device including crossed yagi antenna |
| JP2022071806A (en) * | 2020-10-28 | 2022-05-16 | エーパルステクノロジー | Portable RFID reader including cross Yagi antenna |
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