CN103475387A - Method for improving signal detection sensitiveness of SAW (surface acoustic wave) wireless sensing - Google Patents
Method for improving signal detection sensitiveness of SAW (surface acoustic wave) wireless sensing Download PDFInfo
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- CN103475387A CN103475387A CN2013101393323A CN201310139332A CN103475387A CN 103475387 A CN103475387 A CN 103475387A CN 2013101393323 A CN2013101393323 A CN 2013101393323A CN 201310139332 A CN201310139332 A CN 201310139332A CN 103475387 A CN103475387 A CN 103475387A
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- acoustic wave
- surface acoustic
- receiving circuit
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Abstract
The invention discloses a method for improving the signal detection sensitiveness of SAW (surface acoustic wave) wireless sensing. The method has adopts some measures in aspects of circuit design, circuit arrangement and structural design, and enables a reading apparatus to have the advantages of high sensitiveness, simple structure and low cost. The method is characterized in that to reduce the leakage interference in the receiving circuit by the transmitting circuit, a radio frequency isolation switch is added to a receiving circuit and a transmitting circuit respectively; to reduce the noise interference in the receiving circuit by the transmitting circuit and the digital circuit, relative devices of the receiving circuit are arranged on one side of the circuit board, the remaining parts are arranged on the other side of the circuit board, and the circuits on both sides are isolated by a shielding cavity formed by the ground layer of the circuit board and the metal housing.
Description
Technical field
The present invention relates to sensor field, relate in particular to the reading device method for designing of resonator type surface acoustic wave transducer.
Background technology
Resonator type surface acoustic wave (SAW) transducer can be used for the detection of the physical quantitys such as temperature, pressure, gas, humidity.This transducer can wirelessly read and be fully passive.But as a kind of passive wireless sensor, its transducing signal is weak, the duration is short.This class transducer read the mechanism that will adopt similar pulse Doppler radar.Because these reasons, high-performance, low-cost reading device are one of bottlenecks limited its popularization always.For reducing costs and volume, reading device is wanted the same antenna of transmit-receive sharing, realizes the single circuit plate of system, in this case, the leakage signal of radiating circuit and the noise of digital processing circuit can have a strong impact on the performance of receiving circuit, reduce receiving sensitivity.
Summary of the invention
The invention discloses the method that improves surface acoustic wave wireless transducing signal detection sensitivity.The method is being taked some measures aspect circuit design, circuit layout and structural design, can make reading device have advantages of highly sensitive, simple in structure and cost is low.
The inventive method is characterised in that: in order to reduce radiating circuit, the leakage of receiving circuit is disturbed, at receiving circuit and radiating circuit, respectively increased a radio frequency isolation switch; In order to reduce radiating circuit and the digital circuit noise jamming to receiving circuit, the related device of receiving circuit is arranged in to a side of circuit board, and remainder is arranged in to the circuit board opposite side, the circuit of both sides is kept apart by the stratum of circuit board and the shielding cavity of metal shell formation.
By the measure of above raising isolation, can reduce the interference that receiving circuit is subject to, improve receiving sensitivity.
Hereinafter in connection with the drawings and specific embodiments, the present invention is further illustrated.
The accompanying drawing explanation
Accompanying drawing 1 is the id reader circuit structure that has increased isolating switch.
Accompanying drawing 2 is reading device structural designs of taking for improving receive-transmit isolation.
Embodiment
Accompanying drawing 1 is the id reader circuit structure that has increased isolating switch.Respectively placed a radio frequency isolation switch (as shown in grey box in figure) in radiating circuit and receiving circuit.Wherein the radio-frequency (RF) switch of radiating circuit is in order to cut off rapidly signalling, avoids the hangover signal of emission to disturb reception.The radio-frequency (RF) switch of receiving circuit is in emission state time isolation leakage signal, avoids the impact on receiving circuit.
Accompanying drawing 2 is reading device structural designs of taking for improving receive-transmit isolation.Reading device is comprised of metal shell and circuit-board card, and circuit-board card is embedded on the guide rail of metal shell inwall.In order to reduce radiating circuit and the digital circuit noise jamming to receiving circuit, receiving circuit and selection and isolating switch are arranged in to a side of circuit-board card, and radiating circuit and digital circuit etc. are arranged in to the opposite side of circuit-board card.The circuit of both sides is kept apart by the stratum of circuit-board card and the shielding cavity of metal shell formation.The benefit of doing like this is, do not need for receiving circuit designs special metallic shield, but utilizes other structures to form the electromagnetic shielding chamber, reduced cost.
Embodiment is a kind of concrete form of the present invention.Meeting design feature of the present invention all should be in scope of patent protection.
Claims (2)
1. improve the method for surface acoustic wave wireless transducing signal detection sensitivity, it is characterized in that: in order to reduce radiating circuit, the leakage of receiving circuit is disturbed, at receiving circuit and radiating circuit, respectively increased a radio frequency isolation switch.
2. improve the method for surface acoustic wave wireless transducing signal receiving sensitivity, it is characterized in that: in order to reduce radiating circuit and the digital circuit noise jamming to receiving circuit, the related device of receiving circuit is arranged in to a side of circuit board, and remainder is arranged in to the circuit board opposite side, the circuit of both sides is kept apart by the stratum of circuit board and the shielding cavity of metal shell formation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101393323A CN103475387A (en) | 2013-04-22 | 2013-04-22 | Method for improving signal detection sensitiveness of SAW (surface acoustic wave) wireless sensing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101393323A CN103475387A (en) | 2013-04-22 | 2013-04-22 | Method for improving signal detection sensitiveness of SAW (surface acoustic wave) wireless sensing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103475387A true CN103475387A (en) | 2013-12-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013101393323A Pending CN103475387A (en) | 2013-04-22 | 2013-04-22 | Method for improving signal detection sensitiveness of SAW (surface acoustic wave) wireless sensing |
Country Status (1)
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| CN (1) | CN103475387A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107608263A (en) * | 2017-09-08 | 2018-01-19 | 沈阳航天新光集团有限公司 | A kind of passive communication switching system based on RFID |
| CN108663136A (en) * | 2018-07-16 | 2018-10-16 | 湖北工业大学 | Passive wireless acoustic surface wave temperature sensor anti-interference method |
| CN110958027A (en) * | 2019-12-31 | 2020-04-03 | 深圳市广和通无线股份有限公司 | Radio frequency front-end device and radio frequency communication system |
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| CN101420056A (en) * | 2007-10-24 | 2009-04-29 | 华为技术有限公司 | Microstrip linear filter, duplexer and radio-frequency device |
| CN102215043A (en) * | 2010-04-09 | 2011-10-12 | 国民技术股份有限公司 | Wireless communication module |
| CN102315199A (en) * | 2010-07-08 | 2012-01-11 | 索尼公司 | Module and portable terminal |
| CN102353473A (en) * | 2011-06-23 | 2012-02-15 | 成都赛康信息技术有限责任公司 | Wireless sensor network remote temperature online monitoring system based on surface acoustic wave |
| WO2012126757A1 (en) * | 2011-03-24 | 2012-09-27 | Alcatel Lucent | Printed circuit board and diplexer circuit |
| CN102879700A (en) * | 2012-09-06 | 2013-01-16 | 许继集团有限公司 | Detection apparatus and method of acoustic surface wave of in-place closing of high-voltage isolating switch |
-
2013
- 2013-04-22 CN CN2013101393323A patent/CN103475387A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101420056A (en) * | 2007-10-24 | 2009-04-29 | 华为技术有限公司 | Microstrip linear filter, duplexer and radio-frequency device |
| CN102215043A (en) * | 2010-04-09 | 2011-10-12 | 国民技术股份有限公司 | Wireless communication module |
| CN102315199A (en) * | 2010-07-08 | 2012-01-11 | 索尼公司 | Module and portable terminal |
| WO2012126757A1 (en) * | 2011-03-24 | 2012-09-27 | Alcatel Lucent | Printed circuit board and diplexer circuit |
| CN102353473A (en) * | 2011-06-23 | 2012-02-15 | 成都赛康信息技术有限责任公司 | Wireless sensor network remote temperature online monitoring system based on surface acoustic wave |
| CN102879700A (en) * | 2012-09-06 | 2013-01-16 | 许继集团有限公司 | Detection apparatus and method of acoustic surface wave of in-place closing of high-voltage isolating switch |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107608263A (en) * | 2017-09-08 | 2018-01-19 | 沈阳航天新光集团有限公司 | A kind of passive communication switching system based on RFID |
| CN108663136A (en) * | 2018-07-16 | 2018-10-16 | 湖北工业大学 | Passive wireless acoustic surface wave temperature sensor anti-interference method |
| CN110958027A (en) * | 2019-12-31 | 2020-04-03 | 深圳市广和通无线股份有限公司 | Radio frequency front-end device and radio frequency communication system |
| CN110958027B (en) * | 2019-12-31 | 2022-03-15 | 深圳市广和通无线股份有限公司 | Radio frequency front-end device and radio frequency communication system |
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Application publication date: 20131225 |