CN204288254U - Radiofrequency signal read-write commutation circuit and frequency read/write - Google Patents
Radiofrequency signal read-write commutation circuit and frequency read/write Download PDFInfo
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- CN204288254U CN204288254U CN201420855255.1U CN201420855255U CN204288254U CN 204288254 U CN204288254 U CN 204288254U CN 201420855255 U CN201420855255 U CN 201420855255U CN 204288254 U CN204288254 U CN 204288254U
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Abstract
The utility model relates to radio frequency control technology field, a kind of radiofrequency signal be specially adapted to multi-channel radio frequency signal reads reads and writes commutation circuit and frequency read/write specifically, it is characterized in that being provided with DC bias circuit, PIN on-off circuit, high-frequency signal path, wherein DC bias circuit is connected with the input end of PIN on-off circuit, the output terminal of PIN on-off circuit is connected with the input end of high-frequency signal path, the utility model compared with prior art, by the switching adopting miniwatt components and parts to complete multi-channel rf signal, have rational in infrastructure, cost is low, the significant advantage of grade easy and simple to handle.
Description
Technical field
The utility model relates to radio frequency control technology field, and a kind of radiofrequency signal be specially adapted to multi-channel radio frequency signal reads reads and writes commutation circuit and frequency read/write specifically.
Background technology
In existing technical field of RFID, radio-frequency recognition system generally comprises radio-frequency antenna, for controlling the module for reading and writing of emission of radio frequency signals and reception, and the radio-frequency (RF) tag be fixed on article to be identified, during use, radio-frequency antenna exports radiofrequency signal, radio frequency label reads, the information that radio-frequency (RF) tag is carried feeds back to the signal receiving circuit in module for reading and writing again through radio-frequency antenna, after processing the information received, the ID that can complete radio frequency label and the object represented by it identifies.And in the application of intensive support body, such as, reading in the compact shelving of filing container and the Intelligent bookshelf of reading books, the quantity of antenna is a lot, supports that the hyperchannel read write line of multiple antenna arises at the historic moment.Existing multy-way switching method, it is the break-make carrying out controlling this road with relay, control conducting and the shutoff of radiofrequency signal, the encapsulation of relay is all large than PIN diode with volume, cause pcb board area very large, cost is increased, open in the decline or rising edge produced with shutdown moment in addition due to relay, be mixed with a large amount of high-frequency harmonics, very large electromagnetic interference (EMI) is caused to equipment, relay inherently electromagnetic equipment in addition, can produce interference to the high-frequency signal entered, cause reading performance to reduce.
Summary of the invention
The utility model, for the shortcoming and defect existed in prior art, proposes a kind of radiofrequency signal be specially adapted to multi-channel radio frequency signal reads and reads and writes commutation circuit and frequency read/write.
The utility model can be reached by following measures:
A kind of radiofrequency signal read-write commutation circuit, it is characterized in that being provided with DC bias circuit, PIN on-off circuit, high-frequency signal path, wherein DC bias circuit is connected with the input end of PIN on-off circuit, and the output terminal of PIN on-off circuit is connected with the input end of high-frequency signal path.
The PIN parallel circuit be connected with PIN on-off circuit is also provided with in the utility model.
PIN on-off circuit described in the utility model is provided with inductance L 1, L2, resistance R1, electric capacity C1, C2, diode D1, wherein DC bias circuit accesses the positive pole of diode D1 after connecting with inductance L 1, resistance R1, and high-frequency signal input end accesses the positive pole of diode D1 after connecting with electric capacity C1, the negative pole of diode D1 is connected with C2 and is accessed high-frequency signal output terminal, between the negative pole that inductance L 2 is connected on diode D1 and earth terminal afterwards.
The utility model is also provided with the indicator light circuit be connected with DC bias circuit.
The utility model also proposed a kind of frequency read/write, be provided with control chip (MCU), radio-frequency (RF) receiving circuit, rf modulation circuit, radio frequency transmitter circuitry, radio-frequency antenna array and RF switch circuit, it is characterized in that RF switch circuit adopts circuit structure described above.
Radio-frequency antenna array described in the utility model is provided with N number of radio-frequency antenna, N >=2, and corresponding is provided with N road RF switch circuit, and every road RF switch circuit is responsible for transmission and the reception of radiofrequency signal in a radio-frequency antenna.
In the utility model, control chip (MCU) is connected with radio-frequency (RF) receiving circuit, rf modulation circuit, RF switch circuit respectively, the output terminal of rf modulation circuit is connected with radio frequency transmitter circuitry, and radio frequency transmitter circuitry and radio-frequency (RF) receiving circuit are connected with radio-frequency antenna array through RF switch circuit respectively.
Also be provided with the telecommunication circuit be connected with control chip (MCU) in the utility model, frequency read/write is connected with host computer through telecommunication circuit.
In use, read write line power-on self-test, buzzer call one sound, self-inspection completes the utility model, power light Chang Liang after powering on.Read write line default setting is passive detection pattern.Passive detection pattern waits for that host computer sends out key label instructions, and read write line is connected with host computer by telecommunication circuit, and host computer sends inspection label instructions.Instruction also comprises which road of read write line should the control signal of switched conductive, and the MCU in read write line receives the order that host computer transmits, and resolves.After being parsed, MCU by control circuit control multichannel read write line any road should conducting, control switch field, produce the radiofrequency signal after modulation, radiofrequency signal is after amplifying circuit carries out power amplification, through matched filtering circuit, carry out impedance matching, make output impedance match 50 ohm; RF switch circuit is under the effect of control signal, gating one tunnel, PIN diode forward bias under the effect of direct current biasing on this road, radiofrequency signal can arrive from the high frequency channel on this road and be connected to the antenna of this prevention at radio-frequency port, and there is no those ports of gating, PIN diode reverse bias, radiofrequency signal not by; Radiofrequency signal, by sky alignment space radiation electromagnetic field, goes out the coupled signal being subject to magnetic field with the label in magnetic field, produces electricity, and also turns back on antenna by magnetic Field Coupling by the label information of self, make antenna capture label information; Carry the radiofrequency signal of label information, the high frequency channel of former road selected conducting in RF switch circuit, arrive radio-frequency (RF) receiving circuit; Radio-frequency (RF) receiving circuit carries out demodulation, filtering to the radiofrequency signal of carrying label information, amplify, the circuit such as to compare, and obtains label information; Label information is sent to read write line MCU, and read write line sends host computer by telecommunication circuit to label information, and namely host computer shows after obtaining label information.
The utility model compared with prior art, by the switching adopting miniwatt components and parts to complete multi-channel rf signal, have rational in infrastructure, cost is low, the significant advantage such as easy and simple to handle.
accompanying drawing illustrates:
Accompanying drawing 1 is the structural representation of RF switch circuit in the utility model.
Accompanying drawing 2 is a kind of embodiment schematic diagram of RF switch circuit in the utility model.
Accompanying drawing 3 is structural representations of frequency read/write in the utility model.
Reference numeral: DC bias circuit 1, PIN on-off circuit 2, high-frequency signal path 3, PIN parallel circuit 4, indicator light circuit 5, control chip 6(MCU), radio-frequency (RF) receiving circuit 7, rf modulation circuit 8, radio frequency transmitter circuitry 9, RF switch circuit 10, radio-frequency antenna 11.
embodiment:
Below in conjunction with accompanying drawing, the utility model is further described.
As shown in Figure 1, the utility model proposes a kind of radiofrequency signal read-write commutation circuit, it is characterized in that being provided with DC bias circuit 1, PIN on-off circuit 2, high-frequency signal path 3, wherein DC bias circuit 1 is connected with the input end of PIN on-off circuit 2, and the output terminal of PIN on-off circuit 2 is connected with the input end of high-frequency signal path 3.
The PIN parallel circuit 4 be connected with PIN on-off circuit 2 is also provided with in the utility model.
As shown in Figure 2, PIN on-off circuit 2 described in the utility model is provided with inductance L 1, L2, resistance R1, electric capacity C1, C2, diode D1, wherein DC bias circuit accesses the positive pole of diode D1 after connecting with inductance L 1, resistance R1, high-frequency signal input end is connected with electric capacity C1 and is accessed the positive pole of diode D1 afterwards, and the negative pole of diode D1 is connected with C2 and accessed high-frequency signal output terminal, between the negative pole that inductance L 2 is connected on diode D1 and earth terminal afterwards.
The utility model is also provided with the indicator light circuit 5 be connected with DC bias circuit 1.
The utility model also proposed a kind of frequency read/write, be provided with control chip 6(MCU), radio-frequency (RF) receiving circuit 7, rf modulation circuit 8, radio frequency transmitter circuitry 9, radio-frequency antenna array and RF switch circuit 10, it is characterized in that RF switch circuit 10 adopts circuit structure described above.
Radio-frequency antenna array described in the utility model is provided with N number of radio-frequency antenna 11, N >=2, and corresponding is provided with N road RF switch circuit 10, and every road RF switch circuit 10 is responsible for transmission and the reception of radiofrequency signal in a radio-frequency antenna 11.
Control chip 6(MCU in the utility model) be connected with radio-frequency (RF) receiving circuit 7, rf modulation circuit 8, RF switch circuit 10 respectively, the output terminal of rf modulation circuit is connected with radio frequency transmitter circuitry, and radio frequency transmitter circuitry and radio-frequency (RF) receiving circuit are connected with radio-frequency antenna array through RF switch circuit respectively.
Also be provided with the telecommunication circuit be connected with control chip (MCU) in the utility model, frequency read/write is connected with host computer through telecommunication circuit.
In use, read write line power-on self-test, buzzer call one sound, self-inspection completes the utility model, power light Chang Liang after powering on.Read write line default setting is passive detection pattern.Passive detection pattern waits for that host computer sends out key label instructions, and read write line is connected with host computer by telecommunication circuit, and host computer sends inspection label instructions.Instruction also comprises which road of read write line should the control signal of switched conductive, and the MCU in read write line receives the order that host computer transmits, and resolves.After being parsed, MCU by control circuit control multichannel read write line any road should conducting, control switch field, produce the radiofrequency signal after modulation, radiofrequency signal is after amplifying circuit carries out power amplification, through matched filtering circuit, carry out impedance matching, make output impedance match 50 ohm; RF switch circuit is under the effect of control signal, gating one tunnel, PIN diode forward bias under the effect of direct current biasing on this road, radiofrequency signal can arrive from the high frequency channel on this road and be connected to the antenna of this prevention at radio-frequency port, and there is no those ports of gating, PIN diode reverse bias, radiofrequency signal not by; Radiofrequency signal, by sky alignment space radiation electromagnetic field, goes out the coupled signal being subject to magnetic field with the label in magnetic field, produces electricity, and also turns back on antenna by magnetic Field Coupling by the label information of self, make antenna capture label information; Carry the radiofrequency signal of label information, the high frequency channel of former road selected conducting in RF switch circuit, arrive radio-frequency (RF) receiving circuit; Radio-frequency (RF) receiving circuit carries out demodulation, filtering to the radiofrequency signal of carrying label information, amplify, the circuit such as to compare, and obtains label information; Label information is sent to read write line MCU, and read write line sends host computer by telecommunication circuit to label information, and namely host computer shows after obtaining label information.
The utility model compared with prior art, by the switching adopting miniwatt components and parts to complete multi-channel rf signal, have rational in infrastructure, cost is low, the significant advantage such as easy and simple to handle.
Claims (8)
1. a radiofrequency signal read-write commutation circuit, it is characterized in that being provided with DC bias circuit, PIN on-off circuit, high-frequency signal path, wherein DC bias circuit is connected with the input end of PIN on-off circuit, and the output terminal of PIN on-off circuit is connected with the input end of high-frequency signal path.
2. a kind of radiofrequency signal read-write commutation circuit according to claim 1, is characterized in that also being provided with the PIN parallel circuit be connected with PIN on-off circuit.
3. a kind of radiofrequency signal read-write commutation circuit according to claim 1, it is characterized in that described PIN on-off circuit is provided with inductance L 1, L2, resistance R1, electric capacity C1, C2, diode D1, wherein DC bias circuit accesses the positive pole of diode D1 after connecting with inductance L 1, resistance R1, high-frequency signal input end accesses the positive pole of diode D1 after connecting with electric capacity C1, the negative pole of diode D1 is connected with C2 and is accessed high-frequency signal output terminal, between the negative pole that inductance L 2 is connected on diode D1 and earth terminal afterwards.
4. a kind of radiofrequency signal read-write commutation circuit according to claim 1, is characterized in that also being provided with the indicator light circuit be connected with DC bias circuit.
5. a frequency read/write, be provided with control chip, radio-frequency (RF) receiving circuit, rf modulation circuit, radio frequency transmitter circuitry, radio-frequency antenna array and RF switch circuit, it is characterized in that RF switch circuit adopts as the radiofrequency signal read-write commutation circuit in claim 1-4 as described in any one.
6. a kind of frequency read/write according to claim 5, it is characterized in that described radio-frequency antenna array is provided with N number of radio-frequency antenna, N >=2, corresponding is provided with N road RF switch circuit, and every road RF switch circuit is responsible for transmission and the reception of radiofrequency signal in a radio-frequency antenna.
7. a kind of frequency read/write according to claim 5, it is characterized in that control chip is connected with radio-frequency (RF) receiving circuit, rf modulation circuit, RF switch circuit respectively, the output terminal of rf modulation circuit is connected with radio frequency transmitter circuitry, and radio frequency transmitter circuitry and radio-frequency (RF) receiving circuit are connected with radio-frequency antenna array through RF switch circuit respectively.
8. a kind of frequency read/write according to claim 5, is characterized in that also being provided with the telecommunication circuit be connected with control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420855255.1U CN204288254U (en) | 2014-12-30 | 2014-12-30 | Radiofrequency signal read-write commutation circuit and frequency read/write |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420855255.1U CN204288254U (en) | 2014-12-30 | 2014-12-30 | Radiofrequency signal read-write commutation circuit and frequency read/write |
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| CN204288254U true CN204288254U (en) | 2015-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420855255.1U Active CN204288254U (en) | 2014-12-30 | 2014-12-30 | Radiofrequency signal read-write commutation circuit and frequency read/write |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104504425A (en) * | 2014-12-30 | 2015-04-08 | 威海北洋电气集团股份有限公司 | Radio-frequency signal read-write switching circuit and radio-frequency reader-writer |
| CN105426804A (en) * | 2015-12-14 | 2016-03-23 | 威海北洋电气集团股份有限公司 | Radio frequency signal read-write switching circuit |
-
2014
- 2014-12-30 CN CN201420855255.1U patent/CN204288254U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104504425A (en) * | 2014-12-30 | 2015-04-08 | 威海北洋电气集团股份有限公司 | Radio-frequency signal read-write switching circuit and radio-frequency reader-writer |
| CN105426804A (en) * | 2015-12-14 | 2016-03-23 | 威海北洋电气集团股份有限公司 | Radio frequency signal read-write switching circuit |
| CN105426804B (en) * | 2015-12-14 | 2018-10-26 | 威海北洋电气集团股份有限公司 | Radiofrequency signal reads and writes switching circuit |
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| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160516 Address after: 264200 -6, Torch Road 159, hi tech Zone, Shandong, Weihai, six - Seven Patentee after: The northeast part of China, Weihai optoelectronic information technical concern company Address before: 264200 Torch Road 159, hi tech District, Shandong, Weihai, Weihai Patentee before: Weihai Beiyang Electric Group Co., Ltd. |