CN208570904U - A kind of changeable combined antenna for RFID radio frequency identification - Google Patents
A kind of changeable combined antenna for RFID radio frequency identification Download PDFInfo
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- CN208570904U CN208570904U CN201821426678.6U CN201821426678U CN208570904U CN 208570904 U CN208570904 U CN 208570904U CN 201821426678 U CN201821426678 U CN 201821426678U CN 208570904 U CN208570904 U CN 208570904U
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- 230000010287 polarization Effects 0.000 claims abstract description 42
- 230000008878 coupling Effects 0.000 claims abstract description 17
- 238000010168 coupling process Methods 0.000 claims abstract description 17
- 238000005859 coupling reaction Methods 0.000 claims abstract description 17
- 239000000523 sample Substances 0.000 claims abstract description 5
- 230000007704 transition Effects 0.000 claims description 4
- 239000004677 Nylon Substances 0.000 claims description 3
- 229920001778 nylon Polymers 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 230000006641 stabilisation Effects 0.000 abstract description 3
- 238000011105 stabilization Methods 0.000 abstract description 3
- 230000005855 radiation Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 229910000570 Cupronickel Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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- Variable-Direction Aerials And Aerial Arrays (AREA)
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Abstract
The utility model discloses a kind of changeable combined antenna for RFID radio frequency identification comprising pcb board, PIFA aerial array and double-circle polarization microstrip antenna；Double-circle polarization microstrip antenna is set to top in the middle part of pcb board, PIFA aerial array includes three or more the PIFA antenna elements for being distributed in pcb board side, pcb board upper surface is equipped with 3dB coupling electric bridge and antenna gating circuit, 3dB couples electric bridge tool, and there are two input port and two delivery outlets, 3dB couples electric bridge for realizing the left-handed and dextrorotation double-circle polarization of double-circle polarization microstrip antenna, 3dB coupling electric bridge corresponds to double-circle polarization microstrip antenna in the middle part of pcb board, double-circle polarization microstrip antenna is separately connected two input ports that 3dB couples electric bridge by two feed probes, antenna gating circuit has a signal output and no less than PIFA antenna element number adds 2 gating interface, antenna gating circuit is for switching receiving antenna, the signal output connection output of antenna gating circuit Distribution network.The utility model gain stabilization, wide impedance bandwidth.
Description
Technical field
The utility model relates to antenna technical field more particularly to a kind of changeable combinations for RFID radio frequency identification
Antenna.
Background technique
RFID (Radio Frequency Identification), i.e. Radio Frequency Identification Technology are a kind of contactless
Automatic identification technology.Microchip is embedded into product by RFID technique, and microchip can issue automatically the sequence of product to scanner
The information such as row number, and this process does not need to carry out either scans as bar codes technique, is operable with various adverse circumstances.
RFID technique can recognize high-speed moving object and can identify multiple labels simultaneously, swift and convenient to operate.Not with technical know-how
Disconnected development, RFID have a wide range of applications in fields such as identification, communications and transportation, goods and materials trackings.
In Radio Frequency Identification Technology, the contactless communication between reader and label is the electromagnetic coupling by two aerial coils
It realizes, therefore successfully Antenna Design is the key that RFID application success.Under conditions of reader output power is certain, read
Reading device and label can be related with the magnetic flux of antenna size and antenna generation at a distance from reliable communication, so successful to one
For RFID application, it is extremely important that antenna appropriate is installed to reader.
There is very big challenge and difficulty in the design of reader antenna.It can go out when the size of antenna increases to a certain extent
Existing following problems: (1) signal-to-noise ratio reduces；(2) occur can not label reading magnetic flux hole；(3) matching of antenna to reader becomes
It obtains difficult.Therefore, these challenges and difficulty, the research for reinforcing radio-frequency identification reader antenna is overcome to have great importance.
Summary of the invention
The purpose of this utility model is to provide a kind of changeable combined antenna for RFID radio frequency identification, antennas
At low cost and near-field thermal radiation range is wide, and antenna body is small and exquisite and is easily installed and uses.
The technical solution adopted in the utility model is:
A kind of changeable combined antenna for RFID radio frequency identification comprising pcb board and be set to pcb board upper surface
PIFA aerial array and double-circle polarization microstrip antenna；Double-circle polarization microstrip antenna is set to top, PIFA antenna array in the middle part of pcb board
Column include three or more PIFA antenna elements, and three or more PIFA antenna elements are distributed in pcb board side in polygonal ring shape
Side；The upper surface of pcb board is equipped with 3dB coupling electric bridge and antenna gating circuit, and 3dB couples electric bridge tool, and there are two input port and two
Delivery outlet, 3dB couple electric bridge for realizing the left-handed and dextrorotation double-circle polarization of double-circle polarization microstrip antenna, the double circles of left-handed and dextrorotation
Polarization exports respectively, and 3dB coupling electric bridge corresponds to double-circle polarization microstrip antenna in the middle part of pcb board, and double-circle polarization microstrip antenna is logical
Two input ports that two feed probes are separately connected 3dB coupling electric bridge are crossed, antenna gating circuit is with a delivery outlet and not
Less than the gating interface that PIFA antenna element number adds 2, antenna gating circuit couples electric bridge for switching receiving antenna, 3dB
Delivery outlet is connected respectively a gating interface of antenna gating circuit, and three or more PIFA antenna elements are separately connected day
One gating interface of line selection circuit passband, one end of the signal output connection output matching network of antenna gating circuit, output
The other end of matching network is connected with RF cable.
Further, the band standing internal wave of double-circle polarization microstrip antenna is better than 1.5.
Further, double-circle polarization microstrip antenna is fixed on above pcb board by nylon screw, and double-circle polarization micro-strip day
The spacing of line and pcb board is 15mm.
Further, PIFA aerial array includes four PIFA antenna elements, and it is in rectangular ring that PIFA aerial array, which is overlooked,
Four PIFA antenna elements respectively correspond four sides of straight-flanked ring.
Further, the PIFA antenna element includes oscillator feed arm, oscillator short circuit wall and long and narrow oscillator radiator
Plate；Oscillator radiator plate is parallel with pcb board, and one end of oscillator radiator plate is supported in oscillator feed arm and oscillator short circuit wall
On pcb board, oscillator feed arm is connect with a gating interface of antenna gating circuit, and oscillator short circuit wall and pcb board are reflectingly
Connection.
Further, the oscillator radiator plate is overlooked to trapezoidal, and two right-angle sides of trapezoidal plate are presented with oscillator respectively
Electric arm is connected with oscillator short circuit wall；Oscillator radiator plate narrow end is located at PIFA antenna element tail end；Oscillator radiator plate wide end
Positioned at PIFA antenna element head end；Four PIFA antenna elements, which are set to pcb board edge and are adjacent to from beginning to end, surrounds rectangle.
Further, the oscillator radiator plate narrow end is overlooked in corner cut shape or circular arc gradual transition shape；Vibration
Be equipped at sub- feed arm and oscillator short circuit wall one for assembly raised minor matters.
Further, the PIFA antenna element is with the molding of foreign white copper material.
Further, the RF cable is SMA RF cable.
Further, the antenna gating circuit includes power supply source, RF switch chip, control signal controller, radio frequency
Switch chip has a signal output, three gating control terminals and 8 gating interfaces, power supply source connection control signal control
Device, three control pins for controlling signal controller are separately connected three gating control terminals of RF switch chip, control signal
Controller by change three control pins control RF switch chips connect gating interfaces, the control pin mode in addition to
It is outer by inner antenna control signal controller generation, Reader reader end can also be passed through and export control signal.Three or more
The delivery outlet of PIFA antenna element is separately connected 1 gating interface of RF switch chip, and 3dB couples two delivery outlets of electric bridge
It is separately connected 1 gating interface of RF switch chip, the signal output of RF switch chip connects output matching network.
Further, control signal controller uses the low-power scm of 32 cortex-M3 kernels.
Further, RF switch chip selects 1 RF switch chip for 8, and RF switch chip is SKY13418-485LF.
Further, the matching scheme of output matching network is any one of π type, L-type, X-type.
The utility model uses above technical scheme, has the advantages that in 1, the utility model, adjusts PIFA oscillator
Each parameter value, the impedance adjustable sections of antenna such as the length of (oscillator radiator plate), the height of short-circuit wall are 50 ohm, realize antenna
With the matching of input terminal coaxial feed port, RFID resonance is motivated, realizes wide impedance bandwidth.2, in the utility model, pass through
3dB couples electric bridge and realizes 90 ° of phase differences, realizes circular polarization radiation.The unit main radiator end PIFA uses corner cut or circular arc gradually
Become transient mode, widens bandwidth.PIFA unit feed arm using widen with fillet processing mode, further broaden frequency band.3, originally
Utility model structure is simple, size is small and exquisite, gain stabilization, wide impedance bandwidth, is suitable for RFID of Internet-of-things identifying system, has wide
Wealthy application prospect.
Detailed description of the invention
The utility model is described in further details below in conjunction with the drawings and specific embodiments；
Fig. 1 is a kind of structural schematic diagram of the changeable combined antenna for RFID radio frequency identification of the utility model；
Fig. 2 is that a kind of pcb board upper surface of the changeable combined antenna for RFID radio frequency identification of the utility model shows
It is intended to；
Fig. 3 is a kind of PIFA antenna element knot of the changeable combined antenna for RFID radio frequency identification of the utility model
Structure schematic diagram；
Fig. 4 is that a kind of antenna gating circuit of changeable combined antenna for RFID radio frequency identification of the utility model is former
Manage block diagram.
Specific embodiment
Shown in one of picture 1-4, the utility model discloses a kind of changeable combination days for RFID radio frequency identification
Line comprising pcb board 1 and PIFA aerial array 10 and double-circle polarization microstrip antenna 12 set on 1 upper surface of pcb board；Double circles
Polarization micro-strip antenna 12 is set to 1 middle part top of pcb board, and PIFA aerial array 10 includes three or more PIFA antenna elements 11,
Three or more PIFA antenna elements 11 are distributed in 1 side of pcb board in polygonal ring shape；The upper surface of pcb board 1 is equipped with 3dB coupling
Electric bridge 14 and antenna gating circuit 15 are closed, 3dB couples the tool of electric bridge 14, and there are two input port 141 and two delivery outlets 142,3dB couplings
Electric bridge 14 is closed for realizing the left-handed and dextrorotation double-circle polarization of double-circle polarization microstrip antenna 12, left-handed and dextrorotation double-circle polarization difference
Output, 3dB couple the corresponding double-circle polarization microstrip antenna 12 of electric bridge 14 and are set to 1 middle part of pcb board, and double-circle polarization microstrip antenna 12 passes through
Two feed probes 13 are separately connected two input ports 141 of 3dB coupling electric bridge 14, specifically, 3dB coupling electric bridge 14 uses
3db couples electric bridge or 3db coupling circuit are realized；Antenna gating circuit 15 has a delivery outlet and no less than PIFA antenna element
11 numbers add 2 gating interface, and antenna gating circuit 15 couples the delivery outlet difference of electric bridge 14 for switching receiving antenna, 3dB
It is correspondingly connected with a gating interface of antenna gating circuit 15, three or more PIFA antenna elements 11 are separately connected antenna gating
One gating interface of circuit 15, specifically, connecting gating interface each by 50 ohm microstrip cablings on pcb board 1；Antenna
One end of the signal output connection output matching network 5 of gating circuit 15, the other end of output matching network 5 are connected with radio frequency
Cable 6.
Further, the band standing internal wave of double-circle polarization microstrip antenna 12 is better than 1.5.
Further, double-circle polarization microstrip antenna 12 is fixed on 1 top of pcb board by nylon screw 3, and double-circle polarization is micro-
Spacing with antenna 12 and pcb board 1 is 15mm.
Specifically, double-circle polarization microstrip antenna 12 is in rectangular configuration, the upper surface of double-circle polarization microstrip antenna 12 offers 4
121,4 strip grooves 121 of a strip grooves differ 90 degree and corresponding 12 central symmetry of double-circle polarization microstrip antenna.
Further, as a kind of specific embodiment, double-circle polarization microstrip antenna 12 includes medium substrate, medium substrate
Upper surface is printed with circular radiation patch, and circular radiation patch is located at the center of upper layer medium substrate.Double-circle polarization micro-strip day
The circular radiation patch of line 12 is separately connected two input ports 141 that 3dB couples electric bridge 14 by two feed probes 13.
Further, PIFA aerial array 10 includes four PIFA antenna elements 11, and it is in square that PIFA aerial array 10, which is overlooked,
Shape is cyclic annular, and four PIFA antenna elements 11 respectively correspond four sides of straight-flanked ring.
Further, the PIFA antenna element 11 includes oscillator feed arm 112, oscillator short circuit wall 111 and long and narrow vibration
Sub- radiator plate 110；Oscillator radiator plate 110 is parallel with pcb board 1, and one end of oscillator radiator plate 110 is with oscillator feed arm
112 and oscillator short circuit wall 111 be supported on pcb board 1, a gating interface of oscillator feed arm 112 and antenna gating circuit 15
Connection, the connection reflectingly of oscillator short circuit wall 111 and pcb board 1.
Further, the oscillator radiator plate 110 is overlooked to trapezoidal, two right-angle sides of trapezoidal plate respectively with oscillator
Feed arm 112 is connected with oscillator short circuit wall 111；110 narrow end of oscillator radiator plate is located at 11 tail end of PIFA antenna element；Oscillator
110 wide end of radiator plate is located at 11 head end of PIFA antenna element；Four PIFA antenna elements 11 are set to 1 edge of pcb board and head
Tail, which is adjacent to, surrounds rectangle.
Further, 110 narrow end of oscillator radiator plate is overlooked in corner cut shape or circular arc gradual transition shape；
Be equipped at oscillator feed arm 112 and oscillator short circuit wall 111 one for assembly raised minor matters.
Further, the PIFA antenna element 11 is with the molding of foreign white copper material.
Further, the RF cable 6 is SMA RF cable.
Further, as shown in figure 4, the antenna gating circuit 15 includes power supply source, RF switch chip, control signal
Controller, RF switch chip have a signal output, three gating control terminals and 8 gating interfaces, power supply source connection control
Signal controller processed, three control pins for controlling signal controller are separately connected three gatings control of RF switch chip
End, control signal controller control the gating interface that RF switch chip is connected, the control by changing three control pins
Pin mode can also export control letter other than being generated by inner antenna control signal controller by Reader reader end
Number.The delivery outlet of three or more PIFA antenna elements 11 is separately connected 1 gating interface of RF switch chip, 3dB coupling
Two delivery outlets of electric bridge 14 are separately connected 1 gating interface of RF switch chip, the signal output of RF switch chip
Connect output matching network 5.
Antenna gating circuit 15 selects scheme of the 1 RF switch chip as radio-frequency switch circuit using 8, this 8 selects 1 radio frequency to open
It closes chip to need to carry out switch control using 3 I/O ports, corresponding control logic is as follows:
Wherein, ANT0~ANT7 indicates each gating interface, and IO control signal generator uses single-chip microcontroller in embodiment
Scheme, for single-chip microcontroller using the low-power scm of 32 cortex-M3 kernels, RF switch selection 8 selects 1 switch to use
SKY13418-485LF, single-chip microcontroller IO according to according to communication sequential export more than logic level, to select one of antenna
A period of time, which is used as, applies antenna element.Entire active part uses LDO power supply mode, and output supply voltage is electric from 3.3V~5.5V
Source part uses the LDOSGM2019 of 3.3V output, by the feeder line of ANT output to system power supply.Work-based logic is as follows: equipment from
After feeder line takes electricity, antenna enters initialization wait state, and when receiving work request, antenna is started to work, and operating time is from asking
It asks signal to start, terminates to request signal.
Further, the matching scheme of output matching network 5 is any one of π type, L-type, X-type.
The utility model uses above technical scheme, has the advantages that in 1, the utility model, adjusts PIFA oscillator
Each parameter value, the impedance adjustable sections of antenna such as the length of (oscillator radiator plate 110), the height of short-circuit wall are 50 ohm, are realized
The matching of antenna and input terminal coaxial feed port motivates RFID resonance, realizes wide impedance bandwidth.2, in the utility model,
Electric bridge is coupled by 3dB and realizes 90 ° of phase differences, realizes circular polarization radiation.The unit main radiator end PIFA uses corner cut or circle
Arc gradual transition mode widens bandwidth.PIFA unit feed arm using widen with fillet processing mode, further broaden frequency band.
3, the utility model structure is simple, size is small and exquisite, gain stabilization, wide impedance bandwidth, is suitable for RFID of Internet-of-things identifying system, tool
Have broad application prospects.
Claims (10)
1. a kind of changeable combined antenna for RFID radio frequency identification, it is characterised in that: it includes pcb board and is set to
The PIFA aerial array and double-circle polarization microstrip antenna of pcb board upper surface；On double-circle polarization microstrip antenna is set in the middle part of pcb board
Side, PIFA aerial array include three or more PIFA antenna elements, and three or more PIFA antenna elements are in polygonal ring shape
It is distributed in pcb board side；The upper surface of pcb board is equipped with 3dB coupling electric bridge and antenna gating circuit, and 3dB coupling electric bridge has
Two input ports and two delivery outlets, 3dB couple electric bridge for realizing the double entelechies of left-handed and dextrorotation of double-circle polarization microstrip antenna
To change, left-handed and dextrorotation double-circle polarization exports respectively, and 3dB coupling electric bridge corresponds to double-circle polarization microstrip antenna in the middle part of pcb board,
Double-circle polarization microstrip antenna is separately connected two input ports that 3dB couples electric bridge, antenna gating circuit by two feed probes
Add 2 gating interface with a delivery outlet and no less than PIFA antenna element number, antenna gating circuit is received for switching
The delivery outlet of antenna, 3dB coupling electric bridge is connected respectively a gating interface of antenna gating circuit, three or more
PIFA antenna element is separately connected a gating interface of antenna gating circuit, and the signal output connection of antenna gating circuit is defeated
The other end of one end of matching network out, output matching network is connected with RF cable.
2. a kind of changeable combined antenna for RFID radio frequency identification according to claim 1, it is characterised in that: double
The band standing internal wave of circular polarization microstrip antenna is better than 1.5.
3. a kind of changeable combined antenna for RFID radio frequency identification according to claim 1, it is characterised in that: double
Circular polarization microstrip antenna is fixed on above pcb board by nylon screw, and the spacing of double-circle polarization microstrip antenna and pcb board is
15mm。
4. a kind of changeable combined antenna for RFID radio frequency identification according to claim 1, it is characterised in that:
PIFA aerial array includes four PIFA antenna elements, and it is in rectangular ring, four PIFA antenna elements that PIFA aerial array, which is overlooked,
Respectively correspond four sides of straight-flanked ring.
5. a kind of changeable combined antenna for RFID radio frequency identification according to claim 4, it is characterised in that: institute
Stating PIFA antenna element includes oscillator feed arm, oscillator short circuit wall and long and narrow oscillator radiator plate；Oscillator radiator plate and PCB
Plate is parallel, and one end of oscillator radiator plate is supported on pcb board with oscillator feed arm and oscillator short circuit wall, oscillator feed arm and day
One gating interface of line selection circuit passband connects, the connection reflectingly of oscillator short circuit wall and pcb board.
6. a kind of changeable combined antenna for RFID radio frequency identification according to claim 5, it is characterised in that: institute
Oscillator radiator plate is stated to overlook to trapezoidal, two right-angle sides of trapezoidal plate respectively with oscillator feed arm and oscillator short circuit wall phase
Even；Oscillator radiator plate narrow end is located at PIFA antenna element tail end；It is first that oscillator radiator plate wide end is located at PIFA antenna element
End；Four PIFA antenna elements, which are set to pcb board edge and are adjacent to from beginning to end, surrounds rectangle.
7. a kind of changeable combined antenna for RFID radio frequency identification according to claim 5 or 6, feature exist
In: the oscillator radiator plate narrow end is overlooked in corner cut shape or circular arc gradual transition shape；Oscillator feed arm and oscillator
Be equipped at short-circuit wall one for assembly raised minor matters.
8. a kind of changeable combined antenna for RFID radio frequency identification according to claim 1, it is characterised in that: institute
Stating antenna gating circuit includes power supply source, RF switch chip, control signal controller, and RF switch chip has a signal defeated
Outlet, three gating control terminals and 8 gating interfaces, power supply source connection control signal controller, control the three of signal controller
A control pin is separately connected three gating control terminals of RF switch chip, and control signal controller is by changing three controls
Pin controls the gating interface that RF switch chip is connected, and the delivery outlet of three or more PIFA antenna elements is separately connected radio frequency
1 gating interface of switch chip, 1 gating that two delivery outlets of 3dB coupling electric bridge are separately connected RF switch chip connect
Mouthful, the signal output of RF switch chip connects output matching network.
9. a kind of changeable combined antenna for RFID radio frequency identification according to claim 8, it is characterised in that: control
Signal controller processed uses the low-power scm of 32 cortex-M3 kernels, and RF switch chip selects 1 RF switch for 8
Chip, RF switch chip are SKY13418-485LF.
10. a kind of changeable combined antenna for RFID radio frequency identification according to claim 1 or 8, feature exist
In: the matching scheme of output matching network is any one of π type, L-type, X-type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821426678.6U CN208570904U (en) | 2018-08-31 | 2018-08-31 | A kind of changeable combined antenna for RFID radio frequency identification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821426678.6U CN208570904U (en) | 2018-08-31 | 2018-08-31 | A kind of changeable combined antenna for RFID radio frequency identification |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208570904U true CN208570904U (en) | 2019-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821426678.6U Withdrawn - After Issue CN208570904U (en) | 2018-08-31 | 2018-08-31 | A kind of changeable combined antenna for RFID radio frequency identification |
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| CN (1) | CN208570904U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108963427A (en) * | 2018-08-31 | 2018-12-07 | 福州福大信捷天线技术有限公司 | A kind of changeable combined antenna and its control method for RFID radio frequency identification |
-
2018
- 2018-08-31 CN CN201821426678.6U patent/CN208570904U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108963427A (en) * | 2018-08-31 | 2018-12-07 | 福州福大信捷天线技术有限公司 | A kind of changeable combined antenna and its control method for RFID radio frequency identification |
| CN108963427B (en) * | 2018-08-31 | 2023-11-07 | 福州福大信捷天线技术有限公司 | Switchable combined antenna for RFID (radio frequency identification) and control method thereof |
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Granted publication date: 20190301 Effective date of abandoning: 20231107 |