CN208622108U - A kind of adaptive feed-through nulling system - Google Patents
A kind of adaptive feed-through nulling system Download PDFInfo
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- CN208622108U CN208622108U CN201821210942.2U CN201821210942U CN208622108U CN 208622108 U CN208622108 U CN 208622108U CN 201821210942 U CN201821210942 U CN 201821210942U CN 208622108 U CN208622108 U CN 208622108U
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Abstract
The utility model provides a kind of adaptive feed-through nulling system, including transmitting link, transceiver insulation circuit, feed-through nulling circuit, receive circuit and frequency source circuit, the transmitting input terminal of the output end connection transceiver insulation circuit of the transmitting link, the feed-through nulling circuit input end is separately connected the output end of frequency source circuit and the receiving end S1 of transceiver insulation circuit, the reception circuit input end connects feed-through nulling circuit, and output end connects digital processing element.The utility model the utility model has the advantages that by inhibit radio-frequency carrier leakage signal, improve the sensitivity of ultrahigh-frequency passive radio-frequency identification reader.
Description
Technical field
The utility model belongs to technical field of RFID, more particularly, to a kind of adaptive feed-through nulling system.
Background technique
In ultra-high-frequency passive radio-frequency recognition system, when label and reader communicate, reader, which needs to send carrier wave always, to be mentioned
For tag-powered, label sends information to reader by backscatter modulation.Therefore the signal of label is received in reader
When, the radio-frequency carrier that the forward direction of reader is sent can leak into the reversed receiving portion of reader.Since tag backscatter is returned
Signal strength it is very small compared with the carrier signal strength that forward direction is sent, in actual system difference in signal strength reach 90dB with
On.
Ultrahigh frequency readers generally use directional coupler or circulator to realize preceding reverse signal isolation.
In reader, since antenna impedance is influenced to exactly match by environment and production technology, antenna to reading
The device parameters of length of cable variation and reader internal between device can be due to variation of ambient temperature, and production batch is different
And change, directional coupler and circulator can only provide the isolation of 20-30dB under combined influence.
For ultrahigh frequency readers, low isolation will lead to high carrier leak, and carrier leak height is increased to reception
The requirement of the antenna efficiency range of linearity, while noise entrained by carrier signal can reduce the sensitivity that reader receives signal.
Utility model content
In view of this, the utility model is directed to a kind of adaptive feed-through nulling system, to solve the above problems not
Foot place.
In order to achieve the above objectives, the technical solution of the utility model is achieved in that
A kind of adaptive feed-through nulling system, including transmitting link, transceiver insulation circuit, feed-through nulling circuit, reception electricity
Road and frequency source circuit, the transmitting input terminal of the output end connection transceiver insulation circuit of the transmitting link, the feed-through nulling
Circuit input end is separately connected the output end of frequency source circuit and the receiving end S1 of transceiver insulation circuit, the reception circuit input
End connection feed-through nulling circuit, output end connect digital processing element.
Further, the transmitting link includes DAC, I/Q modulator and signal amplifier, and the output end of the DAC connects
Connect the input terminal of I/Q modulator, the input terminal of the output termination signal amplifier of the I/Q modulator, the signal amplifier
Output end connection transceiver insulation circuit transmitting input terminal.
Further, the transceiver insulation circuit includes circulator or coupler.
Further, the feed-through nulling circuit includes VGA and combiner, and the input terminal of the VGA is connected by power splitter
The output end of frequency synthesizer is connect, the input terminal of the combiner is separately connected the output end of VGA and connecing for transceiver insulation circuit
Receiving end S1, output end connection receive the input terminal of circuit；
Further, the frequency source circuit includes frequency synthesizer and power splitter, the input terminal connection of the power splitter
Three output ends of the output end of frequency synthesizer, power splitter are separately connected I/Q modulator, VGA and i/q demodulator；
Further, the reception circuit includes i/q demodulator and ADC, and the input terminal of ADC connects the defeated of i/q demodulator
Outlet, and output end connects digital processing element.
Compared with the existing technology, adaptive feed-through nulling system described in the utility model has the advantage that
(1) adaptive feed-through nulling system described in the utility model is improved by the leakage signal of inhibition radio-frequency carrier
The sensitivity of ultrahigh-frequency passive radio-frequency identification reader.
(2) adaptive feed-through nulling system described in the utility model is let out using the I/Q modulator of transmitting link to adjust
The phase of leakage signal, amplitude adjustment then only need a VGA to complete；Simple with structure, counteracting is high-efficient, is easy to control
The advantages that processed；Two parameters of amplitude and phase can adjust separately, and be independent of each other, and be not available for other feed-through nulling methods
's.
Detailed description of the invention
The attached drawing for constituting a part of the utility model is used to provide a further understanding of the present invention, this is practical new
The illustrative embodiments and their description of type are not constituteed improper limits to the present invention for explaining the utility model.?
In attached drawing:
Fig. 1 is adaptive feed-through nulling system structure diagram described in the utility model embodiment.
Specific embodiment
It should be noted that in the absence of conflict, the feature in the embodiments of the present invention and embodiment can
To be combined with each other.
The utility model will be described in detail below with reference to the accompanying drawings and embodiments.
As shown in Figure 1, a kind of adaptive feed-through nulling system, including transmitting link, transceiver insulation circuit, feed-through nulling electricity
Road receives circuit and frequency source circuit, and the transmitting input terminal of the output end connection transceiver insulation circuit of the transmitting link is described
Feed-through nulling circuit input end is separately connected the output end of frequency source circuit and the receiving end S1 of transceiver insulation circuit, the reception
Circuit input end connects feed-through nulling circuit, and output end connects digital processing element.
The transmitting link includes DAC, I/Q modulator and signal amplifier, the output end connection I/Q modulation of the DAC
The input terminal of device, the input terminal of the output termination signal amplifier of the I/Q modulator, the output end of the signal amplifier connect
Receive the transmitting input terminal of hair isolation circuit.
The transceiver insulation circuit includes circulator or coupler.
The feed-through nulling circuit includes VGA and combiner, and the input terminal of the VGA is synthesized by power splitter rate of connections
The output end of device, the input terminal of the combiner are separately connected the output end of VGA and the receiving end S1 of transceiver insulation circuit, output
End connection receives the input terminal of circuit.
The frequency source circuit includes frequency synthesizer and power splitter, the input terminal rate of connections synthesizer of the power splitter
Output end, three output ends of power splitter are separately connected I/Q modulator, VGA and i/q demodulator.
The reception circuit includes i/q demodulator and ADC, and the input terminal of ADC connects the output end of i/q demodulator, and defeated
Outlet connects digital processing element.
The working method of the present embodiment is as follows:
A. transmitting link is opened, so that the output power of antenna opening is A, simultaneously closes off the enabled of VGA, test is under this state
Leakage signal S1, the signal I that as ADC is sampled2+Q2；
B. the enabled of transmitting link is closed, VGA is opened, the output signal S2 of VGA is adjusted, so that ADC under this state is adopted
Sample value I '2+Q′2It is identical as the leakage signal S1 in step A；
C. transmitting link and VGA circuit are opened simultaneously, the output signal of DAC is adjusted, guarantees square of the two paths of signals of DAC
With it is consistent, adjust I1, Q1 size, that is, change transmitting signal phase, detect the sampled value of ADC, it is preset until meeting
Threshold value；
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model
Protection scope within.
Claims (6)
1. a kind of adaptive feed-through nulling system, it is characterised in that: including transmitting link, transceiver insulation circuit, feed-through nulling electricity
Road receives circuit and frequency source circuit, and the transmitting input terminal of the output end connection transceiver insulation circuit of the transmitting link is described
Feed-through nulling circuit input end is separately connected the output end of frequency source circuit and the receiving end S1 of transceiver insulation circuit, the reception
Circuit input end connects feed-through nulling circuit, and output end connects digital processing element.
2. a kind of adaptive feed-through nulling system according to claim 1, it is characterised in that: the transmitting link includes
DAC, I/Q modulator and signal amplifier, the input terminal of the output end connection I/Q modulator of the DAC, the I/Q modulator
Output termination signal amplifier input terminal, the signal amplifier output end connection transceiver insulation circuit transmitting input
End.
3. a kind of adaptive feed-through nulling system according to claim 1, it is characterised in that: the transceiver insulation circuit packet
Include circulator or coupler.
4. a kind of adaptive feed-through nulling system according to claim 1, it is characterised in that: the feed-through nulling circuit packet
Include VGA and combiner, the input terminal of the VGA passes through the output end of power splitter rate of connections synthesizer, the combiner it is defeated
Enter end and be separately connected the output end of VGA and the receiving end S1 of transceiver insulation circuit, output end connection receives the input terminal of circuit.
5. a kind of adaptive feed-through nulling system according to claim 1, it is characterised in that: the frequency source circuit includes
Frequency synthesizer and power splitter, the output end of the input terminal rate of connections synthesizer of the power splitter, three outputs of power splitter
End is separately connected I/Q modulator, VGA and i/q demodulator.
6. a kind of adaptive feed-through nulling system according to claim 1, it is characterised in that: the reception circuit includes I/
Q demodulator and ADC, the output end of the input terminal connection i/q demodulator of ADC, and output end connects digital processing element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821210942.2U CN208622108U (en) | 2018-07-27 | 2018-07-27 | A kind of adaptive feed-through nulling system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821210942.2U CN208622108U (en) | 2018-07-27 | 2018-07-27 | A kind of adaptive feed-through nulling system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208622108U true CN208622108U (en) | 2019-03-19 |
Family
ID=65707894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821210942.2U Active CN208622108U (en) | 2018-07-27 | 2018-07-27 | A kind of adaptive feed-through nulling system |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108734043A (en) * | 2018-07-27 | 2018-11-02 | 天津中兴智联科技有限公司 | A kind of adaptive feed-through nulling system and method |
| CN115940991A (en) * | 2023-03-01 | 2023-04-07 | 中国电子科技集团公司第十研究所 | High-isolation L-band transmitting-receiving passive annular assembly and working method thereof |
-
2018
- 2018-07-27 CN CN201821210942.2U patent/CN208622108U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108734043A (en) * | 2018-07-27 | 2018-11-02 | 天津中兴智联科技有限公司 | A kind of adaptive feed-through nulling system and method |
| CN108734043B (en) * | 2018-07-27 | 2024-03-22 | 高新兴智联科技股份有限公司 | Self-adaptive leakage cancellation system and method |
| CN115940991A (en) * | 2023-03-01 | 2023-04-07 | 中国电子科技集团公司第十研究所 | High-isolation L-band transmitting-receiving passive annular assembly and working method thereof |
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Address after: Room 401, building 12, east area, airport business park, No. 80, Huanhe North Road, free trade zone (Airport Economic Zone), Binhai New Area, Tianjin 300000 Patentee after: Gaoxing Zhilian Technology Co.,Ltd. Address before: 300308, Zhongxing Industrial base, 2 East seven, Airport Economic Zone, Tianjin Binhai New Area Patentee before: ZTE INTELLIGENT IOT TECHNOLOGY Co.,Ltd. |
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| CP03 | Change of name, title or address | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Room 401, building 12, East Airport Business Park, 80 Huanhe North Road, Tianjin Binhai New Area pilot free trade zone (Airport Economic Zone) Patentee after: Zte Intelligent Iot Technology Co.,Ltd. Address before: Room 401, building 12, East Airport Business Park, 80 Huanhe North Road, Tianjin Binhai New Area pilot free trade zone (Airport Economic Zone) Patentee before: Gaoxing Zhilian Technology Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |