CN210006056U - RFID card readers - Google Patents
RFID card readers Download PDFInfo
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- CN210006056U CN210006056U CN201921311100.0U CN201921311100U CN210006056U CN 210006056 U CN210006056 U CN 210006056U CN 201921311100 U CN201921311100 U CN 201921311100U CN 210006056 U CN210006056 U CN 210006056U
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- 230000008878 coupling Effects 0.000 claims abstract description 7
- 238000010168 coupling process Methods 0.000 claims abstract description 7
- 238000005859 coupling reaction Methods 0.000 claims abstract description 7
- 230000001939 inductive effect Effects 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 16
- 238000010276 construction Methods 0.000 abstract description 3
- 239000010409 thin film Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000005672 electromagnetic field Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
The utility model discloses an RFID card reader, including card reader circuit and second resonant antenna, the card reader circuit includes resonant antenna and resonant circuit, the resonant antenna includes the coil, the coil is connected with resonant circuit, the second resonant antenna includes second coil and matching capacitance, the both ends of second coil connect matching capacitance's both ends, second coil and coil parallel arrangement, second resonant antenna's resonant frequency is the same with resonant antenna's resonant frequency, both resonance inductive couplings, the utility model discloses an RFID card reader simple structure can enlarge more than 50% with the reading and writing region, and second resonant antenna need not connect any electric wire cable, easy to assemble, and convenient construction is particularly suitable for using on type passageway.
Description
[ technical field ]
The utility model relates to a radio frequency identification technology especially relates to kinds of RFID card readers.
[ background art ]
The passive RFID has three common frequency bands of Low Frequency (LF), High Frequency (HF) and ultrahigh frequency (UHF), the low frequency has two frequency bands of 125KHz and 134.2KHz, the high frequency adopts a passive RFID system of 13.56MHz, the low frequency and the high frequency, the energy and information transmission between a reader-writer and a label is realized by a near field electromagnetic coupling principle, the reader-writer comprises LC resonant antennas consisting of coils and matching capacitors, the electromagnetic waves are emitted, the electromagnetic waves reflected by the label are received by the antennas, the label comprises resonant antennas consisting of coils and matching capacitors, the electromagnetic waves emitted by the reader-writer are received, power is supplied by the electromagnetic waves, the matching degree is adjusted by internal logic, the return coupling of the electromagnetic waves is realized, and information is transmitted.
The communication distance between the reader and the tag, commonly referred to as the read-write distance, is a main performance index of low-frequency and high-frequency RFID systems, and is related to parameters such as the transmission power of the reader, the antenna efficiency, the receiving sensitivity, the wakeup limit of the tag, the antenna efficiency, and the like.
The technology of the low-frequency RFID reader-writer and the high-frequency RFID reader-writer is mature, the technical scheme of improving the reading-writing distance through the parameters basically reaches the limit range, and the optimization degree of the prior art is limited in certain application fields needing to further improve the reading-writing distance .
Under the condition that the maximum communication distance between a reader-writer and a tag is determined, in practical application, if the engineering requirements cannot be met, the mode of multiple antennas is selected as usual, and the area of the read-write tag is expanded by adding the antennas, the utility model patent with the publication number of CN206058212U and the utility model patent with the publication number of CN202632300U all describe the application of the multiple antennas, the two modes of the antenna are added, types are that each antenna is provided with an independent radio frequency read-write circuit, in addition types are that the multiple antennas share group radio frequency read-write circuits, and the radio frequency read-write circuits are switched by an electronic switch.
[ summary of the invention ]
The to-be-solved technical problem of the utility model is to provide kinds of simple structure, construction convenience, the great RFID card reader of reading the card distance.
In order to solve the technical problem, the utility model discloses a technical scheme be, kinds of RFID card readers, including card reader circuit and second resonant antenna, the card reader circuit includes resonant antenna and resonant circuit, resonant antenna includes the coil, the coil is connected with resonant circuit, second resonant antenna includes second coil and matching capacitance, the both ends of second coil connect the both ends of matching capacitance, second coil and coil parallel arrangement, the resonant frequency of second resonant antenna is the same with resonant antenna's resonant frequency, both resonance inductive coupling.
In the RFID card reader, the distance between the second coil and the th coil is larger than the limit distance for reading the card by the th coil of the card reader circuit.
In the RFID reader described above, the distance between the second coil and the th coil is 150% to 200% of the limit distance for reading by the th coil.
In the RFID card reader, the RFID card reader is a channel card reader, the th coil and the second coil are vertically arranged, and a channel for reading cards is formed between the two coils.
The RFID card reader comprises a shell, a card reader circuit is arranged in the shell, a second coil is arranged on the shell, and a card reading area is arranged outside the second coil.
In the above RFID reader, the reader circuit includes a circuit board, and the th coil is disposed on the circuit board as a printed antenna.
The utility model discloses a RFID card reader simple structure can enlarge the reading and writing region more than 50%, and second resonant antenna need not connect any electric wire cable, installs easily, and construction convenience is particularly suitable for using on type passageway.
[ description of the drawings ]
The present invention will be described in further detail at with reference to the following drawings and detailed description.
Fig. 1 is a schematic diagram of an RFID card reader according to an embodiment of the present invention.
Fig. 2 is a structural diagram of an RFID card reader according to embodiment 1 of the present invention.
Fig. 3 is a structural diagram of an RFID card reader according to embodiment 2 of the present invention.
[ detailed description of the invention ]
The embodiment of the utility model provides a RFID card reader is the RFID read write line of low frequency or high frequency, and its principle is as shown in figure 1, including card reader circuit and second LC resonance antenna 21.
The card reader circuit comprises an LC resonant antenna 11 and a resonant circuit 10, the LC resonant antenna 11 comprises a th coil L1 and a th matching capacitor C1, the th coil L1 is connected with the resonant circuit 10, the th matching capacitor C1 resonates with the th coil L1, and the resonant frequency is the transmitting frequency of the reader-writer.
The second LC resonance antenna 21 includes a second coil L2 and a second matching capacitor C2, both ends of the second coil L2 are connected to both ends of the second matching capacitor C2, the second coil L2 is disposed in parallel with the th coil L1, the resonance frequency of the second LC resonance antenna 21 is the same as that of the nd LC resonance antenna 11, and in order to obtain a better space expansion effect, the second coil L2 has the same physical size as that of the th coil L1.
The LC resonant antenna 11 and the second LC resonant antenna 21 realize signal transmission through resonant inductive coupling, and the expanded card reading area of the RFID card reader is positioned at two sides of the second LC resonant antenna coil L2.
When the RFID card reader starts to read the card, an electromagnetic wave signal is transmitted through the th resonant antenna, the coil of the second resonant antenna starts to resonate after being excited by the same-frequency electromagnetic wave, the area between the th resonant antenna and the second resonant antenna is an electromagnetic wave energy high-density area, and the electronic tag can be effectively read and written between the area.
The structure and the principle of the RFID card reader of embodiment 1 of the present invention are shown in fig. 2.
The RFID card reader of embodiment 2 is a 134.2KHz low frequency channel card reader, which includes a reader circuit, a th resonant antenna and a second resonant antenna, the th resonant antenna includes coils and a plurality of high voltage thin film capacitors, the coils are wound by copper wires, the inductance is 350uH, during the winding process, there may be an error in the inductance, tuning can be performed by adjusting the size of the resonant capacitors, all the high voltage thin film capacitors are connected in parallel and then connected in series with the coils, and the sum of the capacitance values of the thin film capacitors and the total capacitance value of the thin film capacitors are equal to each otherAccording to the formulaAnd (4) determining.
The second resonant antenna uses the same coil and the same capacitance as the th resonant antenna, and both ends of the coil L2 are connected to both ends of the capacitor C2, respectively.
The th coil L1 and the second coil L2 are both vertically arranged and are 60cm away from each other to form channels , the distance between the second coil L2 and the th coil L1 is larger than the limit distance of the card reader circuit for reading the card by the th coil L1, and the distance between the two is 150-200% of the limit distance of the card reader circuit for reading the card by the th coil L1.
In the embodiment, the circuit of the reader-writer is connected with the th resonant antenna for reading cards, when the second resonant antenna is not arranged, the farthest distance of the electronic tag 100, which is used for reading the animal injection glass tube and has the diameter of 1.2mm, of the electronic tag is 35cm, the industry leading level is reached, and after the second resonant antenna is added, effective card reading can be carried out in a 60cm channel space formed between the th resonant antenna and the second resonant antenna.
The structure and the principle of the high-frequency 13.56MHz RFID reader-writer of the embodiment 2 of the utility model are shown in figure 3.
The RFID reader-writer is provided with shells 30, a PCB printed coil antenna is adopted as a high-frequency RFID reader-writer , and the reading distance is 0-10 cm.
The circuit board 40 of the reader/writer circuit is disposed at the lower part in the housing 30, and the th coil L1 is disposed as the printed antenna 41 on the circuit board 40. due to structural limitations, the reader/writer circuit board 40 is mounted below the housing 30 by distance, resulting in a situation where the reading/writing distance outside the housing 30 is very small and cannot meet the use requirements.
resonant antennas are added outside the reader-writer to enlarge the reading area, the added resonant antennas are composed of a flexible printed circuit board and a capacitor, wherein a coil is etched on the flexible printed circuit board, two ends of the coil are provided with welding pads, and the resonant frequency of the capacitor and the coil inductor is 13.56 MHz.
The coil L2 of the second resonance antenna is arranged on the top plate 31 of the housing 30 at the reading limit of the high frequency reader/writer printed antenna 41, and a new reading area can be added outside the coil L2 of the second resonance antenna. In this embodiment, the read-write area of the RFID reader after expansion is above the second coil L2, and the electronic tag 100 is above the second coil L2 during reading and writing.
When the reader-writer transmits electromagnetic waves through a built-in antenna ( th resonant antenna), the second resonant antenna is excited by the electromagnetic waves to start generating same-frequency resonance, and a new electromagnetic field area is formed at the side far away from the reader-writer, the electromagnetic field intensity of the area is far greater than the intensity of the electromagnetic waves transmitted by the reader-writer antenna and reaches the position of the same after space attenuation, the electronic tag 100 can be activated in the area and returns to a coupling signal, and the return signal also reaches the second resonant coil firstly and then is coupled to the built-in antenna of the reader-writer through the second resonant coil.
Claims (6)
- The RFID card reader of 1, includes card reader circuit, and the card reader circuit includes th resonant antenna and resonant circuit, and th resonant antenna includes th coil, and th coil is connected with resonant circuit, characterized by, including second resonant antenna, second resonant antenna includes second coil and matching capacitor, and the both ends of second coil connect the both ends of matching capacitor, and second coil and coil parallel arrangement, the resonant frequency of second resonant antenna is the same with the resonant frequency of th resonant antenna, both resonance inductive coupling.
- 2. The RFID reader of claim 1, wherein the distance from the second coil to the th coil is greater than the limit distance for the th coil of the reader circuit to read a card.
- 3. The RFID reader of claim 2, wherein the distance from the second coil to the th coil is 150% to 200% of the limit distance for reading a card with the th coil.
- 4. The RFID reader of claim 2, wherein the RFID reader is a channel reader, the th coil and the second coil are vertically disposed, and a channel for reading is formed therebetween.
- 5. The RFID reader of claim 1, comprising a housing, the reader circuitry disposed in the housing, the second coil disposed on the housing, the reading area outside the second coil.
- 6. The RFID reader of claim 1, wherein the reader circuitry includes a circuit board, the th coil being disposed on the circuit board as a printed antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921311100.0U CN210006056U (en) | 2019-08-14 | 2019-08-14 | RFID card readers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921311100.0U CN210006056U (en) | 2019-08-14 | 2019-08-14 | RFID card readers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210006056U true CN210006056U (en) | 2020-01-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921311100.0U Active CN210006056U (en) | 2019-08-14 | 2019-08-14 | RFID card readers |
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| CN (1) | CN210006056U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110334557A (en) * | 2019-08-14 | 2019-10-15 | 深圳市华士精成科技有限公司 | A kind of RFID card reader increases the method and RFID card reader of card reading distance |
| CN114065793A (en) * | 2021-11-22 | 2022-02-18 | 新开普电子股份有限公司 | Dinner plate card reader based on magnetic field coupling |
-
2019
- 2019-08-14 CN CN201921311100.0U patent/CN210006056U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110334557A (en) * | 2019-08-14 | 2019-10-15 | 深圳市华士精成科技有限公司 | A kind of RFID card reader increases the method and RFID card reader of card reading distance |
| CN114065793A (en) * | 2021-11-22 | 2022-02-18 | 新开普电子股份有限公司 | Dinner plate card reader based on magnetic field coupling |
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