CN103579783B - Vehicle-mounted reading and writing device antenna - Google Patents
Vehicle-mounted reading and writing device antenna Download PDFInfo
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- CN103579783B CN103579783B CN201210254597.3A CN201210254597A CN103579783B CN 103579783 B CN103579783 B CN 103579783B CN 201210254597 A CN201210254597 A CN 201210254597A CN 103579783 B CN103579783 B CN 103579783B
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Abstract
The invention discloses a kind of vehicle-mounted reading and writing device antenna, comprise: the integral structure of four individual pairwise orthogonal combinations of small-sized Yagi antenna, four individual common support firmwares of Yagi antenna, be connected with vehicle-mounted read write line respectively by coaxial cable, inner antenna overall architecture is right-angled intersection symmetrical structure.While four-Yagi antenna integral structure of vehicle-mounted reading and writing device antenna system of the present invention has larger gain, successfully avoid the drawback of the electronic tag reading blind spot that directional antenna exists, possess the horizontal direction antenna pattern of omnidirectional, met the demand reaching omnidirectional's scanning at one time.
Description
Technical field
The present invention relates to field of antenna, particularly relate to a kind of vehicle-mounted reading and writing device antenna.
Background technology
In recent years, along with socioeconomic fast development, increasing rapidly of vehicles number, highway transportation becomes more and more busier.The contradiction of traffic administration present situation and demand is aggravated further, 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 the check and control dynamics of motor vehicle entering road junction, providing technological means for hitting all kinds of criminal offence, is public safety traffic management department problem demanding prompt solution.
For effectively containing act of violating regulations such as vehicle personation car plate and non-annual test etc., control, reduce road traffic accident, police car is installed RFID (RadioFrequencyIdentification, radio-frequency (RF) identification) read-and-write device, automatically identifying the public vehicles of all installation electronic tags around police car, is that public safety traffic management department carries out a kind of effective means of dynamic management and control to motor vehicle.
The vehicle-mounted reading and writing device antenna many employings directional antenna+turntable compound mode of existing police car, within a period of time, vehicle-mounted reading and writing device antenna can 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, increase equipment investment cost, and vehicle-mounted reading and writing device antenna can not put the demand reaching omnidirectional's scanning at one time.
Summary of the invention
The invention provides a kind of vehicle-mounted reading and writing device antenna, can not put to solve existing vehicle-mounted reading and writing device antenna the problem reaching omnidirectional's scanning at one time.
A kind of vehicle-mounted reading and writing device antenna, comprising:
First support unit 5-1, the second support unit 5-2 and the 3rd support unit 5-3, wherein, first support unit 5-1 and the second support unit 5-2 planche cross intersect, form cross structure, 3rd support unit 5-3 vertically places relative to described cross structure, the top of the 3rd support unit 5-3 is fixedly connected with the center of described cross structure, supports described cross structure;
First radiating element 3-1, the second radiating element 3-2, the 3rd radiating element 3-3 and the 4th radiating element 3-4, be separately positioned on 4 linking arms of described cross structure, for being received the radio frequency discrimination RFID electromagnetic signal that vehicle-mounted read write line sends by coaxial cable and feed port, outwards launch 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;
First feed port 1-1, the second feed port 1-2, the 3rd feed port 1-3 and the 4th feed port 1-4, be arranged on the bottom of described 3rd support unit 5-3, described first feed port 1-1 is connected by coaxial cable with the distributing point of the 4th radiating element 3-4 with the distributing point of the 3rd radiating element 3-3, described 4th feed port 1-4 with the distributing point of the second radiating element 3-2, described 3rd feed port 1-3 with the distributing point of the first radiating element 3-1, described second feed port 1-2; Described first feed port 1-1, the second feed port 1-2, the 3rd feed port 1-3, the 4th feed port 1-4 are also connected with vehicle-mounted read write line by coaxial cable;
Coaxial cable 6, lay along described first support unit 5-1, the second support unit 5-2, the 3rd support unit 5-3, respectively with the first radiating element 3-1, the second radiating element 3-2, the 3rd radiating element 3-3, the 4th radiating element 3-4, the first feed port 1-1, the second feed port 1-2, the 3rd feed port 1-3, the 4th feed port 1-4, and vehicle-mounted read write line connects;
First reflector element 2-1, the second reflector element 2-2, the 3rd reflector element 2-3 and the 4th reflector element 2-4, be separately positioned on 4 linking arms of described cross structure, described first reflector element 2-1, the second reflector element 2-2, the 3rd reflector element 2-3, the 4th reflector element 2-4 are respectively used to the backward electromagnetic wave of reflection first radiating element 3-1, the second radiating element 3-2, the 3rd radiating element 3-3, the 4th radiating element 3-4.
As seen from the above technical solution provided by the invention, while four-Yagi antenna integral structure of vehicle-mounted reading and writing device antenna of the present invention has larger gain, successfully avoid the drawback of the electronic tag reading blind spot that directional antenna exists, possess the antenna pattern of the horizontal direction of omnidirectional, met the demand reaching omnidirectional's scanning at one time.
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 (RadioFrequencyIdentification, radio-frequency (RF) identification) is more and more extensive in the application of Internet of Things field, and car networking is an important branch of Internet of Things, and the application that RFID networks at car is also more and more extensive.
The present invention proposes a kind of vehicle-mounted reading and writing device antenna possessing RFID 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.It is individual that above-mentioned vehicle-mounted reading and writing device antenna comprises 4 antennas be combined into by radiating element, reflector element, adjunct unit, support unit and coaxial cable respectively, specifically consists of the following components:
First support unit 5-1, the second support unit 5-2 and the 3rd support unit 5-3, wherein, first support unit 5-1 and the second support unit 5-2 planche cross intersect, form cross structure, 3rd support unit 5-3 is vertical with the cross structure that the second support unit 5-2 is formed relative to above-mentioned first support unit 5-1 to be placed, the top of the 3rd support unit 5-3 is fixedly connected with the center of above-mentioned cross structure, thus supports above-mentioned cross structure.
First radiating element 3-1, the second radiating element 3-2, the 3rd radiating element 3-3 and the 4th radiating element 3-4, be separately positioned on 4 linking arms of above-mentioned cross structure, taken up space to reduce antenna arm, radiating element adopts folded dipole structure, and relative to standard dipole antenna, two arm lengths are approximately half wavelength, taken up space to reduce antenna, 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 the RFID electromagnetic signal of vehicle-mounted read write line transmission by coaxial cable and feed port, 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.
First feed port 1-1, the second feed port 1-2, the 3rd feed port 1-3 and the 4th feed port 1-4, be arranged on the bottom of described 3rd support unit 5-3, described first feed port 1-1 is connected by coaxial cable with the distributing point of the 4th radiating element 3-4 with the distributing point of the 3rd radiating element 3-3, described 4th feed port 1-4 with the distributing point of the second radiating element 3-2, described 3rd feed port 1-3 with the distributing point of the first radiating element 3-1, described second feed port 1-2; Described first feed port 1-1, the second feed port 1-2, the 3rd feed port 1-3, the 4th feed port 1-4 are also connected with vehicle-mounted read write line by coaxial cable;
First reflector element 2-1, second reflector element 2-2, 3rd reflector element 2-3 and the 4th reflector element 2-4, be separately positioned on 4 linking arms of above-mentioned cross structure, first reflector element 2-1 is arranged between the first radiating element 3-1 and the central point of above-mentioned cross structure, second reflector element 2-2 is arranged between the second radiating element 3-2 and the central point of above-mentioned cross structure, 3rd reflector element 2-3 is arranged between the 3rd radiating element 3-3 and the central point of above-mentioned cross structure, 4th reflector element 2-4 is arranged between the 4th radiating element 3-4 and the central point of above-mentioned cross structure.Reflector element can the backward electromagnetic wave of reflected radiation unit, the qualitative radiation of single Yagi antenna that radiating element, reflector element and auxiliary unit are formed, also can reduce the impact of reading and writing device antenna rear structure on antenna performance in addition, strengthen the radiation direction gain of reading and writing device antenna simultaneously.
First adjunct unit 4-1, the second adjunct unit 4-2, the 3rd adjunct unit 4-3 and the 4th adjunct unit 4-4, be separately positioned on 4 linking arms of above-mentioned cross structure, wherein, first adjunct unit 4-1 is connected with the distributing point of the first radiating element 3-1, second adjunct unit 4-2 is connected with the distributing point of the second radiating element 3-2,3rd adjunct unit 4-3 is connected with the distributing point of the 3rd radiating element 3-3, and the 4th adjunct unit 4-4 is connected with the distributing point of the 4th radiating element 3-4.First adjunct unit 4-1, the second adjunct unit 4-2, the 3rd adjunct unit 4-3, the 4th adjunct unit 4-4 pass through at each distributing point place and connect one section of U-shaped conductor, adjust the feed-point port impedance of the first radiating element 3-1, the second radiating element 3-2, the 3rd radiating element 3-3, the 4th radiating element 3-4, making each feed-point port impedance consistent with the impedance of cable 6 is 50 ohm, reduces standing wave; The balanced structure simultaneously changing each distributing point is non-equilibrium structure, and be connected to read write line unit by cable 6 and the first feed port 1-1, the second feed port 1-2, the 3rd feed port 1-3, the 4th feed port 1-4, do not change the radiation characteristic of the first radiating element 3-1, the second radiating element 3-2, the 3rd radiating element 3-3 and the 4th radiating element 3-4.
Coaxial cable 6, lay along described first support unit 5-1, the second support unit 5-2, the 3rd support unit 5-3, respectively with the first radiating element 3-1, the second radiating element 3-2, the 3rd radiating element 3-3, the 4th radiating element 3-4, the first feed port 1-1, the second feed port 1-2, the 3rd feed port 1-3, the 4th feed port 1-4, first adjunct unit 4-1, the second adjunct unit 4-2, the 3rd adjunct unit 4-3, the 4th adjunct unit 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 as shown in Figure 1, during high vehicle speeds, effectively can reduce air drag; Another aerial radiation main body should load 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 of each unit, and are metal quality, such as aluminum pipe etc.
Four feeder lines of reading and writing device antenna of the present invention lead to the 3rd support unit 5-3 of hollow from the distributing point of four radiating elements, bottom from the 3rd support unit 5-3 after inner assembly is drawn by four feed port, finally connects respectively with four ports of vehicle-mounted read write line.
Reading and writing device antenna of the present invention can regard the integral structure of four individual pairwise orthogonal combinations of small-sized Yagi antenna as, and four antenna duplexers prop up supporting piece, and inner antenna overall architecture is right-angled intersection symmetrical structure.Described first radiating element 3-1, first reflector element 2-1, first adjunct unit 4-1 forms the first Yagi antenna, described second radiating element 3-2, second reflector element 2-2, second adjunct unit 4-2 forms the second Yagi antenna, described 3rd radiating element 3-3, 3rd reflector element 2-3, 3rd adjunct unit 4-3 forms the 3rd Yagi antenna, described 4th radiating element 3-4, 4th reflector element 2-4, 4th adjunct unit 4-4 forms the 4th Yagi antenna, described first Yagi antenna, second Yagi antenna, 3rd Yagi antenna, 4th Yagi antenna shares the first support unit 5-1, the supporting construction that second support unit 5-2 and the 3rd support unit 5-3 is formed.
For the first Yagi antenna that the first radiating element 3-1, the first reflector element 2-1, the first adjunct unit 4-1 form, by adjusting the spacing between the first radiating element 3-1, the length of the first reflector element 2-1 and Unit two, adjust the operating frequency of the first Yagi antenna.For Yagi antenna, two arm lengths of the first radiating element 3-1 determine 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 the first reflector element 2-1 slightly larger than half-wavelength, situation when concrete length can use according to reality and determining.First reflector element 2-1 is positioned at the first wavelength place, radiating element 3-1 rear 1/4, and the induced electromotive force of the first reflector element 2-1 on the first radiating element 3-1 is with the induced electromotive force homophase of the first radiating element 3-1 self, and the two superposes enhancing.Specifically, car antenna operating frequency is 920MHz ~ 925MHz, and its wavelength is approximately 32cm, therefore the first radiating element 3-1 horizontal length is about 8cm, and the length of the first reflector element 2-1 is a bit larger tham 16cm, between the two apart from being about 8cm.
Impedance and the directivity of the first Yagi antenna is adjusted by adjusting the first adjunct unit 4-1.A key character of antenna is exactly input impedance, and in resonance condition, antenna such as same resistance is connected on feeder line end.Conventional feed line impedance is 50 ohm, if antenna impedance is also 50 ohm, that just reaches coupling, and the electromagnetic wave that read write line exports 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 then higher than the former 4 times.When after introducing reflector element, impedance relationship just becomes more complicated.Yagi antenna is Differential 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 produce unnecessary transmitting on feeder cable 6.First adjunct unit 4-1 is at feed place and connect one section of U-shaped conductor, adjusts the first radiating element 3-1 port Impedance, also plays " balanced-unbalanced " (i.e. Ba Lun) transformation simultaneously.
The specificity analysis of the operating frequency of above-mentioned second Yagi antenna, the 3rd Yagi antenna, the 4th Yagi antenna, impedance and directivity is identical with above-mentioned first Yagi antenna.That is:
By adjusting the spacing between the second radiating element 3-2, the length of the second reflector element 2-2 and Unit two, adjust the operating frequency of the second Yagi antenna.Impedance and the directivity of the second Yagi antenna is adjusted by adjusting the second adjunct unit 4-2.
By adjusting the spacing between the 3rd radiating element 3-3, the length of the 3rd reflector element 2-3 and Unit two, adjust the operating frequency of the 3rd Yagi antenna.Impedance and the directivity of the 3rd Yagi antenna is adjusted by adjusting the 3rd adjunct unit 4-3.
By adjusting the spacing between the 4th radiating element 3-4, the length of the 4th reflector element 2-4 and Unit two, adjust the operating frequency of the 4th Yagi antenna.Impedance and the directivity of the 4th Yagi antenna is adjusted by adjusting the 4th adjunct unit 4-4.
Relative to the Yagi antenna of standard, above-mentioned first, second and third increases to 70 degree with the horizontal lobe angle of four Yagi antennas, and gain is about 5dBi, increases electromagnetic field coverage while sacrificing gain.Due to the design feature of Yagi antenna, about single Yagi antenna and the adding of rear same individual antenna, limited on respective individual antenna body radiation direction performance impact, on the contrary, 45 degree of angle directions between adjacent body antenna, electromagnetic field superposes, and demonstrates stronger radiation characteristic.I.e. 45 degree of angle directions between above-mentioned first Yagi antenna, the second Yagi antenna, 45 degree of angle directions between the second Yagi antenna and the 3rd Yagi antenna, 45 degree of angle directions between the 3rd Yagi antenna and the 4th Yagi antenna, and the 4th the electromagnetic field in 45 degree of 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, is connected with vehicle-mounted read write line by radio frequency cable, 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, may be used for the public vehicles that the supervise and examine of police car electronics is furnished with electronic tag.
Fig. 3 is the structural representation of car antenna after a kind of encapsulation of providing of the present invention, and the radome base of larger area contributes to reducing main body center of gravity, is connected with police car roof by screw, the steadiness of raising 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 describe according to embodiment and be distributed in the device of embodiment, also can carry out respective change and be arranged in the one or more devices being different from the present embodiment.Above-described embodiment can merge into parts, also can split into multiple subassembly further.
In sum, while four-Yagi antenna integral structure of vehicle-mounted reading and writing device antenna of the present invention has larger gain, successfully avoid the drawback of the electronic tag reading blind spot that directional antenna exists, possesses the antenna pattern of the horizontal direction of omnidirectional, meet the demand reaching omnidirectional's scanning at one time, radiation-curable inspection vehicle's surroundings region, sphere of action is larger.
The compact structure of vehicle-mounted reading and writing device antenna of the present invention is compact, does not relate to the valuable mechanical devices such as turntable, while with low cost, can to front and back to and neighboring trace vehicle effectively identify, antenna gain is moderate, and identification range is comparatively large, meets the performance requirement of police car onboard system.
The normal driving vehicle of adjacent multilane within vehicle-mounted reading and writing device antenna of the present invention coordinates BAP (Battery-AssistedPassivetag, battery auxiliary electron label) Absorbable organic halogens to read distance police car 40 meters.Relative to prior art, vehicle-mounted reading and writing device antenna system of the present invention, while reduction equipment cost, improves police car identification vehicle range, the illegal public vehicles of more efficiently supervise and examine greatly.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within 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:
First support unit (5-1), the second support unit (5-2) and the 3rd support unit (5-3), wherein, first support unit (5-1) and the second support unit (5-2) planche cross intersect, form cross structure, 3rd support unit (5-3) is vertically placed relative to described cross structure, the top of the 3rd support unit (5-3) is fixedly connected with the center of described cross structure, supports described cross structure;
First radiating element (3-1), the second radiating element (3-2), the 3rd radiating element (3-3) and the 4th radiating element (3-4), be separately positioned on 4 linking arms of described cross structure, for being received the radio frequency discrimination RFID electromagnetic signal that vehicle-mounted read write line sends by coaxial cable and feed port, outwards launch 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;
First feed port (1-1), second feed port (1-2), 3rd feed port (1-3) and the 4th feed port (1-4), be arranged on the bottom of described 3rd support unit (5-3), the distributing point of described first feed port (1-1) and the first radiating element (3-1), the distributing point of described second feed port (1-2) and the second radiating element (3-2), the distributing point of described 3rd feed port (1-3) and the 3rd radiating element (3-3), described 4th feed port (1-4) is connected by coaxial cable with the distributing point of the 4th radiating element (3-4), described first feed port (1-1), the second feed port (1-2), the 3rd feed port (1-3), the 4th feed port (1-4) are also connected with vehicle-mounted read write line by coaxial cable,
Coaxial cable 6, lay along described first support unit (5-1), the second support unit (5-2), the 3rd support unit (5-3), respectively with the first radiating element (3-1), the second radiating element (3-2), the 3rd radiating element (3-3), the 4th radiating element (3-4), the first feed port (1-1), the second feed port (1-2), the 3rd feed port (1-3), the 4th feed port (1-4), and vehicle-mounted read write line connects;
First reflector element (2-1), the second reflector element (2-2), the 3rd reflector element (2-3) and the 4th reflector element (2-4), be separately positioned on 4 linking arms of described cross structure, described first reflector element (2-1), the second reflector element (2-2), the 3rd reflector element (2-3), the 4th reflector element (2-4) are respectively used to the backward electromagnetic wave of reflection first radiating element (3-1), the second radiating element (3-2), the 3rd radiating element (3-3), the 4th radiating element (3-4).
2. vehicle-mounted reading and writing device antenna according to claim 1, it is characterized in that, described first reflector element (2-1) is arranged between the first radiating element (3-1) and the central point of above-mentioned cross structure, second reflector element (2-2) is arranged between the second radiating element (3-2) and the central point of above-mentioned cross structure, 3rd reflector element (2-3) is arranged between the 3rd radiating element (3-3) and the central point of above-mentioned cross structure, 4th reflector element (2-4) is arranged between the 4th radiating element (3-4) and the central point of above-mentioned cross structure.
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:
First adjunct unit (4-1), second adjunct unit (4-2), 3rd adjunct unit (4-3) and the 4th adjunct unit (4-4), be separately positioned on 4 linking arms of described cross structure, first adjunct unit (4-1), second adjunct unit (4-2), 3rd adjunct unit (4-3), 4th adjunct unit (4-4) respectively with the first radiating element (3-1), second radiating element (3-2), 3rd radiating element (3-3), the distributing point of the 4th radiating element (3-4) connects, first adjunct unit (4-1), second adjunct unit (4-2), 3rd adjunct unit (4-3), 4th adjunct unit (4-4) is by connecing conductor adjust each feed-point port impedance at each distributing point place, make each feed-point port impedance consistent with the impedance of cable, first adjunct unit (4-1), second adjunct unit (4-2), 3rd adjunct unit (4-3), 4th adjunct unit (4-4) is also connected to vehicle-mounted read write line by cable, change the first radiating element (3-1), second radiating element (3-2), 3rd radiating element (3-3), the balanced structure of the distributing point of the 4th radiating element (3-4) is non-equilibrium structure, do not change the first radiating element (3-1), second radiating element (3-2), the radiation characteristic of the 3rd radiating element (3-3) and the 4th radiating element (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, it is characterized in that, described first radiating element (3-1), the second radiating element (3-2), the 3rd radiating element (3-3) and the 4th radiating element (3-4) adopt folded dipole structure.
6. vehicle-mounted reading and writing device antenna according to claim 3, it is characterized in that, described first radiating element (3-1), first reflector element (2-1), first adjunct unit (4-1) forms the first Yagi antenna, described second radiating element (3-2), second reflector element (2-2), second adjunct unit (4-2) forms the second Yagi antenna, described 3rd radiating element (3-3), 3rd reflector element (2-3), 3rd adjunct unit (4-3) forms the 3rd Yagi antenna, described 4th radiating element (3-4), 4th reflector element (2-4), 4th adjunct unit (4-4) forms the 4th Yagi antenna, described first Yagi antenna, second Yagi antenna, 3rd Yagi antenna, the qualitative radiation of 4th Yagi antenna, and share the first support unit (5-1), the supporting construction that second support unit (5-2) and the 3rd support unit (5-3) are formed.
7. vehicle-mounted reading and writing device antenna according to claim 6, it is characterized in that, by adjusting the spacing between the first radiating element (3-1), the length of the first reflector element (2-1) and the first radiating element (3-1), the first reflector element (2-1), adjust the operating frequency of described first Yagi antenna;
By adjusting the spacing between the second radiating element (3-2), the length of the second reflector element (2-2) and the second radiating element (3-2), the second reflector element (2-2), adjust the operating frequency of described second Yagi antenna;
By adjusting the spacing between the 3rd radiating element (3-3), the length of the 3rd reflector element (2-3) and the 3rd radiating element (3-3), the 3rd reflector element (2-3), adjust the operating frequency of described 3rd Yagi antenna;
By adjusting the spacing between the 4th radiating element (3-4), the length of the 4th reflector element (2-4) and the 4th radiating element (3-4), the 4th reflector element (2-4), adjust the operating frequency of described 4th Yagi antenna.
8. vehicle-mounted reading and writing device antenna according to claim 6, is characterized in that,
Return loss and the directivity of described first Yagi antenna is adjusted by adjusting the first adjunct unit (4-1);
Return loss and the directivity of described second Yagi antenna is adjusted by adjusting the second adjunct unit (4-2);
Return loss and the directivity of described 3rd Yagi antenna is adjusted by adjusting the 3rd adjunct unit (4-3);
Return loss and the directivity of described 4th Yagi antenna is adjusted by adjusting the 4th adjunct unit (4-4).
9. vehicle-mounted reading and writing device antenna according to claim 6, it is characterized in that, 45 degree of angle directions between described first Yagi antenna, the second Yagi antenna, 45 degree of angle directions between the second Yagi antenna and the 3rd Yagi antenna, 45 degree of angle directions between the 3rd Yagi antenna and the 4th Yagi antenna, and the 4th the electromagnetic field in 45 degree of 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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| Application Number | Priority Date | Filing Date | Title |
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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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| CN103579783A CN103579783A (en) | 2014-02-12 |
| CN103579783B true CN103579783B (en) | 2015-11-11 |
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| CN103928750A (en) * | 2014-04-08 | 2014-07-16 | 陈昊 | Superhigh-frequency radio frequency identification micro-strip conformal yagi antenna |
| 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 |
| CN104085358B (en) * | 2014-07-10 | 2016-05-11 | 江苏本能科技有限公司 | It is a kind of for the car-mounted device of radio-frequency identification reader/writer and antenna is installed |
| CN106911012B (en) * | 2017-04-01 | 2023-03-31 | 华侨大学 | High-gain reader-writer antenna of fitting room RFID system |
| CN111029716B (en) * | 2019-12-19 | 2022-05-03 | 重庆壹城桥慧科技有限公司 | RFID antenna device |
| KR102561439B1 (en) * | 2020-10-28 | 2023-07-31 | 주식회사 에이펄스테크롤리지 | Handheld RFID reader comprising cross Yagi antenna |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4083051A (en) * | 1976-07-02 | 1978-04-04 | Rca Corporation | Circularly-polarized antenna system using tilted dipoles |
| CN200969402Y (en) * | 2006-11-16 | 2007-10-31 | 京信通信技术(广州)有限公司 | Dual-polarization wide frequency band antenna and its radiating element and I-shaped single polarized vibrator |
| CN101673874A (en) * | 2009-10-13 | 2010-03-17 | 厦门大学 | Unsymmetrical double dipole antenna used for vehicle-mounted digital television |
-
2012
- 2012-07-20 CN CN201210254597.3A patent/CN103579783B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4083051A (en) * | 1976-07-02 | 1978-04-04 | Rca Corporation | Circularly-polarized antenna system using tilted dipoles |
| CN200969402Y (en) * | 2006-11-16 | 2007-10-31 | 京信通信技术(广州)有限公司 | Dual-polarization wide frequency band antenna and its radiating element and I-shaped single polarized vibrator |
| CN101673874A (en) * | 2009-10-13 | 2010-03-17 | 厦门大学 | Unsymmetrical double dipole antenna used for vehicle-mounted digital television |
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|---|---|
| CN103579783A (en) | 2014-02-12 |
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