CN203573325U - Multichannel radio frequency antenna switching device and RFID multi-antenna device - Google Patents
Multichannel radio frequency antenna switching device and RFID multi-antenna device Download PDFInfo
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- CN203573325U CN203573325U CN201320742528.7U CN201320742528U CN203573325U CN 203573325 U CN203573325 U CN 203573325U CN 201320742528 U CN201320742528 U CN 201320742528U CN 203573325 U CN203573325 U CN 203573325U
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Abstract
The utility model relates to the technical field of radio frequency identification (RFID, Radio Frequency Identification), and specifically relates to a multichannel radio frequency antenna switching device and an RFID multi-antenna device capable of effectively reducing the omission factor and the false detection rate. The multichannel radio frequency antenna switching device comprises a radio frequency reader-writer, a radio frequency switch unit composed by more than two channels of radio frequency switch circuits, a controller, and a radio frequency antenna set composed by more than two radio frequency antennas. The multichannel radio frequency antenna switching device is characterized in that a control signal output terminal of the radio frequency reader-writer is connected with the controller, a radio frequency signal output terminal of the radio frequency reader-writer is connected with the radio frequency switch unit, an output terminal of the radio frequency switch unit is connected with the radio frequency antenna set, and a control signal output terminal of the controller is connected with a control signal input terminal of the radio frequency switch unit. Compared with the prior art, the multichannel radio frequency antenna switching device and the RFID multi-antenna device are advantageous in that problems that when the conventional radio frequency reader-writer operates in a mode of one reader-writer with multiple antennas, the success rate of the detection is low due to insufficient energy of the antennas and collision of the multichannel radiofrequency signals can be avoided so that the success rate of detection is improved.
Description
Technical field
The utility model relates to radio-frequency (RF) identification (RFID, Radio Frequency Identification) technical field, specifically a kind ofly can effectively reduce multi-channel rf antenna-switching device and RFID multi-antenna arrangement undetected, false drop rate.
Background technology
As everyone knows, rfid device generally comprises electronic tag, read write line and backend application device three parts, wherein read write line is the main thoroughfare that connects backend application device and electronic tag, mainly comprise: Anneta module, radio-frequency channel module and control processing module, wherein radio-frequency channel module and control processing module can directly be integrated in read write line again, part read write line can also be integrated with Anneta module, during work, each read write line drives an antenna corresponding thereto, but the limited coverage area of single antenna, especially many at barrier, in the situation of circumstance complication, its effective coverage distance can further shorten, be unfavorable for reading fast a large amount of electronic tags, therefore most rfid devices adopt the mode that makes the multiple antennas of read write line band, current common form comprises is with two, one band fourth class form, but reading and writing device antenna quantity cannot infinite expanding, this be due to: one, when the array of multiple reading and writing device antenna compositions reads a label simultaneously, in control processing module, there will be collision, treatment effeciency is controlled in impact, two, in national standard, the emissive power to read write line is restricted, with this understanding, by the multiple prevention at radio-frequency port of parallel connection, drives multiple antenna work, can reduce the useful power of each antenna, shortens antenna and reads distance.
In existing RFID device, during twin aerial work, adopt the form of power division to realize, the power averaging of frequency read/write is distributed to two antennas, each antenna only obtains the half of frequency read/write power, the energy that each like this antenna obtains is little, to the label between two antennas, can have few inspection, undetected situation, and it is uncontrollable between twin aerial, to work, can only selects antenna sets to work or antenna sets is not worked simultaneously simultaneously, reading performance is unstable, reads success ratio low.
Summary of the invention
When the utility model is worked under a band multi-mode for existing frequency read/write, multiple antenna energy deficiencies and the multi-channel rf signal problems such as power is low that are detected as that cause that bump, have proposed a kind ofly can effectively improve the multi-channel rf antenna-switching device and the RFID multi-antenna arrangement that are detected as power.
The utility model can reach by following measures:
A kind of multi-channel rf antenna-switching device, comprise radio-frequency (RF) switch unit, the controller of the above radio-frequency switch circuit composition of frequency read/write, two-way, the radio-frequency antenna group of more than two radio-frequency antenna composition, the control signal output terminal that it is characterized in that frequency read/write is connected with controller, the radiofrequency signal output terminal of frequency read/write is connected with radio-frequency (RF) switch unit, the output terminal of radio-frequency (RF) switch unit is connected with radio-frequency antenna group, and the control signal output terminal of controller is connected with the control signal input end of radio-frequency (RF) switch unit.
Frequency read/write described in the utility model is provided with microcontroller chip ARM, the modulation circuit being connected with microcontroller chip, the power amplification circuit being connected with modulation circuit output terminal, wherein the output terminal of power amplification circuit is connected with the input end of radio-frequency (RF) switch unit, makes the radiofrequency signal of power amplification circuit output send into radio-frequency antenna after the selection of radio-frequency (RF) switch unit.
In controller described in the utility model, be provided with microcontroller chip, this microcontroller chip also can adopt ARM to realize, the control signal input end of controller is connected with microcontroller chip ARM in frequency read/write, corresponding control command during for received RF read write line output radiofrequency signal, controller is according to this control command, to radio-frequency (RF) switch unit output switching control command, control the break-make of the multi-channel rf on-off circuit in radio-frequency (RF) switch unit.
The match circuit that in the utility model radio-frequency (RF) switch unit, radio-frequency switch circuit comprises high level conduction module and is connected with high level conduction module, wherein the control signal input end of high level conduction module is connected with controller, the radio-frequency (RF) signal input end of high level conduction module is connected with the output terminal of power amplification circuit in frequency read/write, and match circuit is connected with radio-frequency antenna.
The utility model is also provided with pilot lamp, is used to indicate the On/Off state of certain road radio-frequency (RF) switch.
In the utility model radio-frequency switch circuit, high level conduction module is provided with HF switch control circuit, alternating current-direct current turning circuit, and wherein HF switch control circuit is provided with triode, for the signal of control module being converted to the Continuity signal of direct current; Alternating current-direct current turning circuit is for providing the guiding path of direct current signal and AC signal, thereby realize while deserving not conducting of direct current signal, AC signal is not conducting of radiofrequency signal, when direct current signal conducting, AC signal is radiofrequency signal conducting, rely on the characteristic of alternating current-direct current turning circuit, can complete antenna switching controls arbitrarily.
In the utility model controller, be also provided with control enable circuits, for realizing controller work, enable.
When the utility model is used, frequency read/write provides radiofrequency signal, and radiofrequency signal is delivered to radio-frequency (RF) switch unit, it is also address signal that while frequency read/write provides the control command corresponding with the radiofrequency signal of exporting to controller, controller receives after the address signal being sent by frequency read/write, first judge whether enable control circuit enables, when enabling after control circuit enables, controller is started working, address signal is converted to the control signal of low and high level, and send control signal to radio-frequency (RF) switch unit, in radio-frequency (RF) switch unit, be provided with radio-frequency switch circuit more than two-way, radio-frequency switch circuit is provided with alternating current-direct current turning circuit and HF switch control circuit, alternating current-direct current turning circuit provides the guiding path of direct current signal and AC signal, HF switch control circuit converts the control signal of low and high level to alternating current-direct current Continuity signal, corresponding radio-frequency antenna group antenna just can be worked selectively, thereby realize the switching controls between twin aerial.
A kind of RFID multi-antenna arrangement, is provided with multi-channel rf antenna-switching device and plural RFID label to be read, it is characterized in that multi-channel rf antenna-switching device is said structure.
The utility model compared with prior art, has the following advantages: it is high that (1) reads success ratio: twin aerial switching controls, and make two antennas all obtain whole power of radiofrequency signal, the energy that antenna obtains is many, reads success ratio high; (2) reading performance is stable: twin aerial switching controls, and the energy that the label at two antenna edge places is obtained is many, and reading performance is good, and reading performance is naturally very stable; (3) controlled to any twin aerial work: by firmware control, to realize the address selection to antenna, by hardware circuit, realize the conducting of antennas paths radiofrequency signal, thereby guarantee that twin aerial work is controlled; (4) flexible and convenient operation: can be to switching controls between any two antennas, simple and convenient.
accompanying drawing explanation:
Accompanying drawing 1 is the structural representation of multi-channel rf antenna-switching device in the utility model.
Accompanying drawing 2 is structural representations of frequency read/write in the utility model.
Accompanying drawing 3 is structural representations of RFID multi-antenna arrangement in the utility model.
Reference numeral: frequency read/write 1, radio-frequency (RF) switch unit 2, controller 3, radio-frequency antenna group 4, pilot lamp 5, radio-frequency switch circuit 6, radio-frequency antenna 7, microcontroller chip 8, modulation circuit 9, power amplification circuit 10, HF switch control circuit 11, alternating current-direct current turning circuit 12, match circuit 13, radio-frequency (RF) tag 14.
embodiment:
Below in conjunction with drawings and Examples, the utility model is further described.
As shown in Figure 1, the utility model proposes a kind of multi-channel rf antenna-switching device, comprise frequency read/write 1, the radio-frequency (RF) switch unit 2 that the above radio-frequency switch circuit 6 of two-way forms, controller 3, the radio-frequency antenna group 4 that more than two radio-frequency antenna 7 forms, the control signal output terminal that it is characterized in that frequency read/write 1 is connected with controller 3, the radiofrequency signal output terminal of frequency read/write 1 is connected with radio-frequency (RF) switch unit 2, the output terminal of radio-frequency (RF) switch unit 2 is connected with radio-frequency antenna group 4, the control signal output terminal of controller 3 is connected with the control signal input end of radio-frequency (RF) switch unit 2, plural radio-frequency antenna 7 in radio-frequency antenna group 4 is corresponding one by one with the radio-frequency switch circuit 6 more than interior two-way in radio-frequency (RF) switch unit 2, thereby realize the corresponding duty of controlling a road radio-frequency antenna 7 of every road radio-frequency switch circuit 6.
As shown in Figure 2, frequency read/write 1 described in the utility model is provided with microcontroller chip 8(ARM), the modulation circuit 9 being connected with microcontroller chip 8, the power amplification circuit 10 being connected with modulation circuit 9 output terminals, wherein the output terminal of power amplification circuit 10 is connected with the input end of radio-frequency (RF) switch unit 2, make the radiofrequency signal that power amplification circuit 10 is exported after the selection of radio-frequency (RF) switch unit 2, send into radio-frequency antenna 7, in addition in frequency read/write 1, be also provided with the receiving circuit that reads RFID label information for receiving and processing, receiving circuit adopts existing techniques in realizing, this does not repeat.
In controller 3 described in the utility model, be provided with microcontroller chip, this microcontroller chip also can adopt ARM to realize, the control signal input end of controller 3 is connected with microcontroller chip ARM in frequency read/write 1, corresponding control command during for received RF read write line output radiofrequency signal, controller 3 is according to this control command, to radio-frequency (RF) switch unit 2 output switching control commands, control the break-make of the multi-channel rf on-off circuit 6 in radio-frequency (RF) switch unit 2.
The match circuit 13 that in the utility model radio-frequency (RF) switch unit 2, radio-frequency switch circuit 6 comprises high level conduction module and is connected with high level conduction module, wherein the control signal input end of high level conduction module is connected with controller, the radio-frequency (RF) signal input end of high level conduction module is connected with the output terminal of power amplification circuit in frequency read/write, and match circuit 13 is connected with radio-frequency antenna 7; Wherein in the utility model radio-frequency switch circuit 6, high level conduction module is provided with HF switch control circuit 11, alternating current-direct current turning circuit 12, and wherein HF switch control circuit 11 is provided with triode, for the signal of control module being converted to the Continuity signal of direct current; Alternating current-direct current turning circuit 12 is for providing the guiding path of direct current signal and AC signal, thereby realize while deserving not conducting of direct current signal, AC signal is not conducting of radiofrequency signal, when direct current signal conducting, AC signal is radiofrequency signal conducting, rely on the characteristic of alternating current-direct current turning circuit, can complete antenna switching controls arbitrarily.
The utility model is also provided with pilot lamp 5, is used to indicate the On/Off state of certain road radio-frequency (RF) switch.
In the utility model controller 3, be also provided with control enable circuits, for realizing controller work, enable.
When the utility model is used, frequency read/write 1 provides radiofrequency signal, and radiofrequency signal is delivered to radio-frequency (RF) switch unit 2, it is also address signal that while frequency read/write 1 provides the control command corresponding with the radiofrequency signal of exporting to controller 3, controller 3 receives after the address signal being sent by frequency read/write 1, first judge whether enable control circuit enables, when enabling after control circuit enables, controller 3 is started working, address signal is converted to the control signal of low and high level, and send control signal to radio-frequency (RF) switch unit 2, in radio-frequency (RF) switch unit 2, be provided with radio-frequency switch circuit more than two-way, radio-frequency switch circuit is provided with alternating current-direct current turning circuit and HF switch control circuit, alternating current-direct current turning circuit provides the guiding path of direct current signal and AC signal, HF switch control circuit converts the control signal of low and high level to alternating current-direct current Continuity signal, corresponding radio-frequency antenna group antenna just can be worked selectively, thereby realize the switching controls between twin aerial.
As shown in Figure 3, the utility model has also proposed a kind of RFID multi-antenna arrangement, is provided with multi-channel rf antenna-switching device and plural RFID label 14 to be read, it is characterized in that multi-channel rf antenna-switching device is said structure.
The utility model compared with prior art, has the following advantages: it is high that (1) reads success ratio: twin aerial switching controls, and make two antennas all obtain whole power of radiofrequency signal, the energy that antenna obtains is many, reads success ratio high; (2) reading performance is stable: twin aerial switching controls, and the energy that the label at two antenna edge places is obtained is many, and reading performance is good, and reading performance is naturally very stable; (3) controlled to any twin aerial work: by firmware control, to realize the address selection to antenna, by hardware circuit, realize the conducting of antennas paths radiofrequency signal, thereby guarantee that twin aerial work is controlled; (4) flexible and convenient operation: can be to switching controls between any two antennas, simple and convenient.
Claims (7)
1. a multi-channel rf antenna-switching device, comprise radio-frequency (RF) switch unit, the controller of the above radio-frequency switch circuit composition of frequency read/write, two-way, the radio-frequency antenna group of more than two radio-frequency antenna composition, the control signal output terminal that it is characterized in that frequency read/write is connected with controller, the radiofrequency signal output terminal of frequency read/write is connected with radio-frequency (RF) switch unit, the output terminal of radio-frequency (RF) switch unit is connected with radio-frequency antenna group, and the control signal output terminal of controller is connected with the control signal input end of radio-frequency (RF) switch unit.
2. a kind of multi-channel rf antenna-switching device according to claim 1, it is characterized in that the modulation circuit that described frequency read/write is provided with microcontroller chip ARM, is connected with microcontroller chip, the power amplification circuit being connected with modulation circuit output terminal, wherein the output terminal of power amplification circuit is connected with the input end of radio-frequency (RF) switch unit.
3. a kind of multi-channel rf antenna-switching device according to claim 2, is characterized in that being provided with microcontroller chip in described controller, and the control signal input end of controller is connected with microcontroller chip ARM in frequency read/write.
4. a kind of multi-channel rf antenna-switching device according to claim 1, it is characterized in that the match circuit that in radio-frequency (RF) switch unit, radio-frequency switch circuit comprises high level conduction module and is connected with high level conduction module, wherein the control signal input end of high level conduction module is connected with controller, the radio-frequency (RF) signal input end of high level conduction module is connected with the output terminal of power amplification circuit in frequency read/write, and match circuit is connected with radio-frequency antenna.
5. a kind of multi-channel rf antenna-switching device according to claim 1, is characterized in that being provided with pilot lamp, and pilot lamp is connected with the radio-frequency switch circuit in radio-frequency (RF) switch unit.
6. a kind of multi-channel rf antenna-switching device according to claim 1, it is characterized in that in radio-frequency switch circuit, high level conduction module is provided with HF switch control circuit, alternating current-direct current turning circuit, HF switch control circuit is connected with alternating current-direct current turning circuit.
7. a RFID multi-antenna arrangement, is provided with multi-channel rf antenna-switching device and plural RFID label to be read, it is characterized in that the multi-channel rf antenna-switching device as described in any one in claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320742528.7U CN203573325U (en) | 2013-11-22 | 2013-11-22 | Multichannel radio frequency antenna switching device and RFID multi-antenna device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320742528.7U CN203573325U (en) | 2013-11-22 | 2013-11-22 | Multichannel radio frequency antenna switching device and RFID multi-antenna device |
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| Publication Number | Publication Date |
|---|---|
| CN203573325U true CN203573325U (en) | 2014-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320742528.7U Expired - Lifetime CN203573325U (en) | 2013-11-22 | 2013-11-22 | Multichannel radio frequency antenna switching device and RFID multi-antenna device |
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| CN (1) | CN203573325U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103632116A (en) * | 2013-11-22 | 2014-03-12 | 威海北洋电气集团股份有限公司 | Multi-path radio frequency antenna shifter and RFID (radio frequency identification) multi-antenna system |
| CN103632116B (en) * | 2013-11-22 | 2016-11-30 | 威海北洋电气集团股份有限公司 | Multi-channel rf antenna-switching device and RFID multiaerial system |
| CN110414288A (en) * | 2019-07-29 | 2019-11-05 | 广州佳都数据服务有限公司 | Read-and-write device, system and reading/writing method |
-
2013
- 2013-11-22 CN CN201320742528.7U patent/CN203573325U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103632116A (en) * | 2013-11-22 | 2014-03-12 | 威海北洋电气集团股份有限公司 | Multi-path radio frequency antenna shifter and RFID (radio frequency identification) multi-antenna system |
| CN103632116B (en) * | 2013-11-22 | 2016-11-30 | 威海北洋电气集团股份有限公司 | Multi-channel rf antenna-switching device and RFID multiaerial system |
| CN110414288A (en) * | 2019-07-29 | 2019-11-05 | 广州佳都数据服务有限公司 | Read-and-write device, system and reading/writing method |
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| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140430 |
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| CX01 | Expiry of patent term |