CN208570948U - A kind of PIFA antenna of RFID radio frequency identification - Google Patents
A kind of PIFA antenna of RFID radio frequency identification Download PDFInfo
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- CN208570948U CN208570948U CN201821421779.4U CN201821421779U CN208570948U CN 208570948 U CN208570948 U CN 208570948U CN 201821421779 U CN201821421779 U CN 201821421779U CN 208570948 U CN208570948 U CN 208570948U
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Abstract
The utility model discloses a kind of PIFA antenna of RFID radio frequency identification comprising pcb board and micro-strip radiating element and PIFA unit group above pcb board；Micro-strip radiating element is located at the top at pcb board upper surface center；PIFA unit group includes the PIFA unit of at least three or more, 3 or more PIFA units are evenly distributed on the outer edge of pcb board upper surface, the upper surface of pcb board is etched with mutually independent microstrip feed network and PIFA feeding network, and the lower surface of pcb board is equipped with reflectingly；Microstrip feed network is equipped with an output end and at least one input terminal, PIFA feeding network is equipped with the input terminal of an output end and no less than PIFA unit number, the connection of the input terminal of micro-strip radiating element and microstrip feed network, 3 or more PIFA units are connect with an input terminal of PIFA feeding network respectively.Micro-strip is combined into increase antenna gain with PIFA in the utility model, reduces cost.
Description
Technical field
The utility model relates to RFID RFID antenna more particularly to a kind of PIFA antennas of RFID radio frequency identification.
Background technique
Radio frequency identification (RFID) is a kind of wireless communication technique, and specific objective can be identified by radio signals and is read and write
Related data, without establishing mechanical or optical contact between identifying system and specific objective.The signal of radio is to pass through
It is tuned into the electromagnetic field of radio frequency, data are sent out from the label being attached on article, to recognize and track automatically
The article.With the continuous development of technical know-how, RFID has extensively in identification, the fields such as communications and transportation, goods and materials tracking
Application.
In Radio Frequency Identification Technology, the design of label antenna is one of key technology.As the transmitting-receiving in RFID communication system
The quality of equipment, antenna performance directly influences the quality of whole system.Under some special scenes, such as: shop production line
The detection and tracking of article in upper specified region.In such scene, the object with label just can be by specified region
It reads, and leaving specified region will not be read into.The near field read-write device that RFID system just needs a region controllable at this time
Antenna, the antenna only operate in very close region, and when far from antenna, far field electric field is decayed rapidly；In near field workspace
Domain field distribution is uniform, and according to demand can be adjustable with area；Antenna accomplishes good matching in working frequency range.
There is very big challenge and difficulty in the design of label antenna, such as: application environment is influenced to label bring, different
The impedance matching of label IC circuit, bandwidth of operation etc. as wide as possible.Therefore, overcome these challenges and difficult, reinforcement radio frequency knowledge
The research of distinguishing label antenna has great importance.
Summary of the invention
The purpose of this utility model is to provide a kind of PIFA antennas of RFID radio frequency identification, for solving existing RFID days
The problems such as line scheme near-field thermal radiation narrow range, tag scan is not complete, at high cost is widely used in convenient cabinet, the internets such as refrigerator
New public safety.
The technical solution adopted in the utility model is:
A kind of PIFA antenna of RFID radio frequency identification comprising pcb board and the micro-strip radiating element above pcb board
With PIFA unit group；The micro-strip radiating element is located at the top at pcb board upper surface center；The PIFA unit group includes at least
3 or more PIFA units, 3 or more PIFA units are evenly distributed on the outer edge of pcb board upper surface, the upper table of pcb board
Face is etched with mutually independent microstrip feed network and PIFA feeding network, and the lower surface of pcb board is equipped with reflectingly；It is microstrip-fed
Network is equipped with an output end and at least one input terminal, and PIFA feeding network is equipped with an output end and no less than PIFA unit
The input terminal of the input terminal of number, the micro-strip radiating element and microstrip feed network connects, 3 or more PIFA units point
It is not connect with an input terminal of PIFA feeding network.
Further, the micro-strip radiating element is connected by the input terminal of feed probes and microstrip feed network.
Further, there are two input terminals for the tool of microstrip feed network, and micro-strip radiating element is using two root distances from micro-strip spoke
It penetrates unit center 40mm and angle and differs two input terminals that 90 ° of feed probes are separately connected microstrip feed network.
Further, the micro-strip radiating element by nylon screw be set to pcb board above, and micro-strip radiating element with
The spacing of pcb board is 10mm.
Further, the PIFA unit includes main radiator, short-circuit wall and feed arm；The main radiator of PIFA unit is flat
Row is arranged in pcb board, and the feed arm of PIFA unit is correspondingly connected with an input port of PIFA feeding network, the short circuit of PIFA unit
Wall passes through pcb board and is reflectingly electrically connected with pcb board lower surface.
Further, the PIFA unit uses stainless steel material, and in plating nickel on surface processing.
Further, PIFA unit is 4, and 4 PIFA units are around pcb board center with 90 ° of angle rotation distributions, PIFA feedback
Electric network is one point of four feeding network, and 4 PIFA units are electrically connected 4 input terminals of corresponding one point of four feeding network
Mouthful.
Further, microstrip feed network and PIFA feeding network are by Wilkinson power divider or T shape power splitter or annular
Coupler configurations molding.
Further, microstrip feed network is made of a Wilkinson power divider, the Wilkinson of microstrip feed network
The tap of output end of the major joint of power splitter as microstrip feed network, the Wilkinson power divider of microstrip feed network is made
For the input terminal of microstrip feed network, and the length by controlling micro-strip cabling realizes that the phase differences of two adjacent input ports is
90°；PIFA feeding network is one point of four feeding network being made of 3 Wilkinson power dividers, and PIFA feeding network is wherein
Input terminal of respective two taps of two Wilkinson power dividers respectively as PIFA feeding network, PIFA feeding network
Two Wilkinson power dividers major joint again respectively with the last one Wilkinson power divider of PIFA feeding network
One tap is connected, and the major joint of the last one Wilkinson power divider of PIFA feeding network is as PIFA feeding network
Output end, and by control micro-strip cabling length realize two adjacent input ports phase difference be 90 °.
Further, the first isolation resistance is equipped between the tap of the Wilkinson power divider of microstrip feed network；
The second isolation resistance is equipped between two respective taps of Wilkinson power divider of PIFA feeding network.
It further, further include SMA connecting line, the core wire of SMA connecting line is electrically connected the defeated of microstrip feed network
The output end of outlet and PIFA feeding network, the shielded layer connection of SMA connecting line is reflectingly.
The utility model uses above technical scheme, compared with prior art, a kind of PIFA vibration provided by the utility model
Sub-antenna has the advantages that each parameter values such as the length of 1, adjustment PIFA oscillator, the height of short-circuit wall, the impedance adjustable of antenna
Section is 50 ohm, realizes the matching of antenna and input terminal coaxial feed port, motivates RFID resonance, realizes wide impedance bandwidth.
2, each parameter value of feeding network is adjusted, circularly polarised wave can be excited, realizes the circular polarisation of antenna, widens axial ratio bandwidth.3, this is practical
It is novel it is middle using micro-strip in such a way that PIFA is combined, by two different types of antennas fusions on an antenna, not only increase
The big gain of antenna, also reduces cost.The utility model is suitable for RFID of Internet-of-things identifying system, has wide 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 schematic top plan view of the PIFA antenna of RFID radio frequency identification of the utility model；
Fig. 2 is a kind of pcb board surface structure schematic diagram of the PIFA antenna of RFID radio frequency identification of the utility model；
Fig. 3 is a kind of PIFA cellular construction schematic diagram of the PIFA antenna of RFID radio frequency identification of the utility model；
Fig. 4 is a kind of return loss plot figure of the PIFA antenna of RFID radio frequency identification of the utility model；
Fig. 5 is that a kind of axis of the PIFA antenna of RFID radio frequency identification of the utility model compares curve graph；
Fig. 6 is a kind of gain radiation directional diagram of the PIFA antenna of RFID radio frequency identification of the utility model.
Specific embodiment
In order to be clearer and more clear technical problem to be solved in the utility model, technical solution and beneficial effect, with
Under in conjunction with the accompanying drawings and embodiments, the present invention will be further described in detail.It should be appreciated that specific reality described herein
It applies example to be only used to explain the utility model, is not used to limit the utility model, the embodiments of the present invention and implementation
Feature in example can be combined with each other.
As shown in one of Fig. 1-6, the utility model provides a kind of PIFA antenna of RFID radio frequency identification comprising PCB
Plate 1 and micro-strip radiating element 12 and PIFA unit group above pcb board 1；The micro-strip radiating element 12 is located at pcb board
The top of 1 upper surface center；The PIFA unit group includes PIFA unit 11,3 of at least three or more or more PIFA units
11 are evenly distributed on the outer edge of 1 upper surface of pcb board, and the upper surface of pcb board 1 is etched with mutually independent microstrip feed network 2
With PIFA feeding network 3, the lower surface of pcb board 1 is equipped with (not to be indicated) in figure reflectingly；Microstrip feed network 2 is equipped with an output
End 125 and at least one input terminal 124, PIFA feeding network 3 are equipped with an output end 120 and no less than PIFA unit 11
Several input terminals 122, the micro-strip radiating element 12 are connect with the input terminal 124 of microstrip feed network 2,3 or more PIFA
Unit 11 is connect with an input terminal 122 of PIFA feeding network 3 respectively.
Further, the micro-strip radiating element 12 is connect by feed probes 13 with the input terminal of microstrip feed network 2.
Further, the tool of microstrip feed network 2 is there are two input terminal 124, micro-strip radiating element 12 using two root distances from
The feed probes 13 that 12 center 40mm of micro-strip radiating element and angle differ 90 ° be separately connected microstrip feed network 2 two are defeated
Enter end 124.
Further, the micro-strip radiating element 12 is set to above pcb board by nylon screw 4, and micro-strip radiating element
12 with the spacing of pcb board 1 be 10mm.
Further, the PIFA unit 11 includes main radiator 110, short-circuit wall 112 and feed arm 111；PIFA unit
11 main radiator 110 is parallel to the setting of pcb board 1, and the feed arm 111 of PIFA unit 11 is correspondingly connected with PIFA feeding network 3
One input port 122, the short-circuit wall 112 of PIFA unit 11 pass through pcb board 1 and are electrically connected reflectingly with 1 lower surface of pcb board.
Further, the PIFA unit 11 uses stainless steel material, and in plating nickel on surface processing.
Further, PIFA unit 11 is 4, and 4 PIFA units 11 are distributed around 1 center of pcb board with 90 ° of angle rotations,
PIFA feeding network 3 is one point of four feeding network, and 4 PIFA units 11 are electrically connected the 4 of corresponding one point of four feeding network
A input port 122.
Further, microstrip feed network 2 and PIFA feeding network 3 are by Wilkinson power divider or T shape power splitter or ring
The molding of shape coupler configurations.
Further, microstrip feed network 2 is made of a Wilkinson power divider, the Weir gold of microstrip feed network 2
Output end 125 of the major joint of gloomy power splitter as microstrip feed network 2, the Wilkinson power divider of microstrip feed network 2
Input terminal 124 of the tap as microstrip feed network 2, and two adjacent input terminals are realized by the length of control micro-strip cabling
The phase difference of mouth 124 is 90 °, is equipped with the first isolation resistance between the tap of the Wilkinson power divider of microstrip feed network 2
126；PIFA feeding network 3 is one point of four feeding network being made of 3 Wilkinson power dividers, PIFA feeding network 3 its
In two Wilkinson power dividers respective two taps respectively as PIFA feeding network 3 input terminal 122, PIFA feedback
The second isolation resistance 123, PIFA feeding network are equipped between two respective taps of Wilkinson power divider of electric network 3
The major joint of 3 two Wilkinson power dividers again respectively with the last one Wilkinson power divider of PIFA feeding network 3
A tap be connected, the major joint of the last one Wilkinson power divider of PIFA feeding network 3 is fed as PIFA
The output end 120 of network 3, and realize that the phase difference of two adjacent input terminals 122 is 90 ° by the length of control micro-strip cabling.
The setting of first isolation resistance 126 and the second isolation resistance 123 improves the isolation of related port for absorbing reflection signal.
It further, further include SMA connecting line (not shown), the core wire of SMA connecting line is electrically connected micro-strip
The output end 125 of feeding network 2 and the output end 120 of PIFA feeding network 3, the shielded layer connection of SMA connecting line is reflectingly.
The utility model uses above technical scheme, compared with prior art, a kind of PIFA vibration provided by the utility model
Sub-antenna has the advantages that each parameter values such as the length of 1, adjustment PIFA oscillator, the height of short-circuit wall, the impedance adjustable of antenna
Section is 50 ohm, realizes the matching of antenna and input terminal coaxial feed port, motivates RFID resonance, realizes wide impedance bandwidth.
2, each parameter value of feeding network is adjusted, circularly polarised wave can be excited, realizes the circular polarisation of antenna, widens axial ratio bandwidth.3, this is practical
It is novel it is middle using micro-strip in such a way that PIFA is combined, by two different types of antennas fusions on an antenna, not only increase
The big gain of antenna, also reduces cost.The utility model is suitable for RFID of Internet-of-things identifying system, has wide application
Prospect.
Claims (10)
1. a kind of PIFA antenna of RFID radio frequency identification, it is characterised in that: it includes pcb board and micro- above pcb board
Band radiating element and PIFA unit group；The micro-strip radiating element is located at the top at pcb board upper surface center；The PIFA unit
Group includes the PIFA unit of at least three or more, and 3 or more PIFA units are evenly distributed on the outer edge of pcb board upper surface,
The upper surface of pcb board is etched with mutually independent microstrip feed network and PIFA feeding network, and the lower surface of pcb board is equipped with reflection
Ground；Microstrip feed network is equipped with an output end and at least one input terminal, and PIFA feeding network is equipped with an output end and not
Less than the input terminal of PIFA unit number, the input terminal of the micro-strip radiating element and microstrip feed network is connected, and 3 or more
PIFA unit connect respectively with an input terminal of PIFA feeding network.
2. a kind of PIFA antenna of RFID radio frequency identification according to claim 1, it is characterised in that: the micro-strip radiation is single
Member is connected by the input terminal of feed probes and microstrip feed network.
3. a kind of PIFA antenna of RFID radio frequency identification according to claim 2, it is characterised in that: microstrip feed network
For tool there are two input terminal, micro-strip radiating element differs 90 ° of feedback using two root distances from micro-strip radiating element center 40mm and angle
Electric probe is separately connected two input terminals of microstrip feed network.
4. a kind of PIFA antenna of RFID radio frequency identification according to claim 1, it is characterised in that: the micro-strip radiation is single
Member is set to above pcb board by nylon screw, and the spacing of micro-strip radiating element and pcb board is 10mm.
5. a kind of PIFA antenna of RFID radio frequency identification according to claim 1, it is characterised in that: the PIFA unit packet
Include main radiator, short-circuit wall and feed arm；The main radiator of PIFA unit is parallel to pcb board setting, the feed arm of PIFA unit
It is correspondingly connected with an input port of PIFA feeding network, the short-circuit wall of PIFA unit passes through pcb board and anti-with pcb board lower surface
It is electrically connected with penetrating.
6. a kind of PIFA antenna of RFID radio frequency identification according to claim 1, it is characterised in that: PIFA unit is 4,
For 4 PIFA units around pcb board center with 90 ° of angle rotation distributions, PIFA feeding network is one point of four feeding network, 4 PIFA
Unit is electrically connected 4 input ports of corresponding one point of four feeding network.
7. a kind of PIFA antenna of RFID radio frequency identification according to claim 1, it is characterised in that: microstrip feed network and
PIFA feeding network is by Wilkinson power divider or the construction molding of T shape power splitter or annular coupler.
8. a kind of PIFA antenna of RFID radio frequency identification according to claim 1 or 6, it is characterised in that: microstrip-fed net
Network is made of a Wilkinson power divider, and the major joint of the Wilkinson power divider of microstrip feed network is as microstrip-fed net
The output end of network, input terminal of the tap of the Wilkinson power divider of microstrip feed network as microstrip feed network, and lead to
The length for crossing control micro-strip cabling realizes that the phase difference of two adjacent input ports is 90 °；PIFA feeding network is by 3 Weirs
One point of four feeding network that the gloomy power splitter of gold is constituted, respective the two of the two of them Wilkinson power divider of PIFA feeding network
Respectively as the input terminal of PIFA feeding network, the master of two Wilkinson power dividers of PIFA feeding network connects a tap
Head is connected with a tap of the last one Wilkinson power divider of PIFA feeding network respectively again, PIFA feeding network
The last one Wilkinson power divider output end of the major joint as PIFA feeding network, and pass through control micro-strip cabling
Length realizes that the phase difference of two adjacent input ports is 90 °.
9. a kind of PIFA antenna of RFID radio frequency identification according to claim 1, it is characterised in that: microstrip feed network
The first isolation resistance is equipped between the tap of Wilkinson power divider；Two Wilkinson power dividers of PIFA feeding network
The second isolation resistance is equipped between respective tap.
10. a kind of PIFA antenna of RFID radio frequency identification according to claim 1, it is characterised in that: it further includes that SMA connects
Wiring, the core wire of SMA connecting line are electrically connected the output end of microstrip feed network and the output end of PIFA feeding network, SMA
The shielded layer connection of connecting line is reflectingly.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821421779.4U CN208570948U (en) | 2018-08-31 | 2018-08-31 | A kind of PIFA antenna of RFID radio frequency identification |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821421779.4U CN208570948U (en) | 2018-08-31 | 2018-08-31 | A kind of PIFA antenna of RFID radio frequency identification |
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| CN208570948U true CN208570948U (en) | 2019-03-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066106A (en) * | 2018-08-31 | 2018-12-21 | 福州福大信捷天线技术有限公司 | A kind of RFID radio frequency identification combined antenna |
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2018
- 2018-08-31 CN CN201821421779.4U patent/CN208570948U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109066106A (en) * | 2018-08-31 | 2018-12-21 | 福州福大信捷天线技术有限公司 | A kind of RFID radio frequency identification combined antenna |
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