CN103888202B - A kind of narrowband carrier leaks arrester - Google Patents
A kind of narrowband carrier leaks arrester Download PDFInfo
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- CN103888202B CN103888202B CN201410079144.0A CN201410079144A CN103888202B CN 103888202 B CN103888202 B CN 103888202B CN 201410079144 A CN201410079144 A CN 201410079144A CN 103888202 B CN103888202 B CN 103888202B
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Abstract
The present invention disclose a kind of in super high frequency radio frequency recognition read-write machine for eliminating the arrester of receiving loop carrier wave.Narrowband carrier of the present invention leaks arrester and is made up of an annular bridge coupler and a reflective network circuit, wherein: annular bridge coupler arranges a conductive layer in the one side of an insulating barrier, an annular conductive ring with four ports on it is set at the another side of this insulating barrier; Reflective network circuit is made up of the resistance of parallel connection, electric capacity and inductance, and resistance capacitance and inductance one termination 4 port, the in addition direct ground connection in one end.The present invention has that structure is simple, cost is low, arrowband transmission circuit can be made to have high isolation, read write line high receiving sensitivity and the remote demand identified can be met completely, do you be specially adapted to the UHF of China? in rfid system, the present invention both can be made of one with arrowband transmission circuit circuit board, also can be independent element.
Description
Technical field
The present invention relates to a kind of microwave device, particularly a kind of in super high frequency radio frequency recognition read-write machine for eliminating the arrester of receiving loop carrier wave.
Background technology
Along with the proposition of Internet of Things concept, REID obtains high speed development, be widely used in the field such as industry, agricultural, business, the such as merchandise control etc. in the security monitoring of public transport charge system, logistics management, personnel and the control of production process and supermarket, REID has been deep into the every aspect of people's life.
Radio-frequency recognition system is primarily of read write line, and transponder and back-end data treatment system composition, wherein the sensitivity of read write line and the backscattering performance of transponder determine the reading distance of system.
Because transponder does not have direct current power supply, read write line must be launched a continuous wave signal and activate transponder, and read write line is returned in the modulation signal backscattering that then transponder contains data message, obtains required information after background process.Due to transmit and Received signal strength frequency closely, with filter, they can not be separated, thus general circulator by the receiving and transmitting signal of read write line separate.
The isolation of circulator generally only has about 25dB, and when read write line output power of transmitter is 1W, the carrier wave revealed at receiving loop is 6dBm.And typical read write line receiver receiving sensitivity is-80dBm, if antenna gain is 6dBi, the carrier power so revealed at receiving loop will 80dB larger than Received signal strength.So large leakage signal can not only flood Received signal strength, causes receiving sensitivity to reduce, and easily causes receiving loop saturated, makes receiver cisco unity malfunction.
In order to reduce and eliminate the carrier signal of receiving loop, a lot of scholar proposes the method that various carrier wave is eliminated in recent years.The people such as W.Lim with J.Yu propose employing two antennas and are separated transmitting and receiving signal as document 1:W.LimandJ.Yu.Balancedcirculatorstructurewithenhancedis olationcharacteristics [J] .Microw.Opt.Technol.Lett.Sep.2008.50 (8) .pp:2389-2391..Although this method can improve isolation, too increase complexity and the cost of system simultaneously.The people such as PekkaPursula propose the carrier cancellation circuit of cross feedback, the dynamic range of receiver can be made to increase about 10dB, as document 2:PekkaPursula, MikkoKivirantaandHeikkiSeppa.UHFRFIDReaderwithReflectedP owerCanceller [J] .IEEEMicrowaveandWirelessComponentsLetters.January2009.1 9 (1) .pp:48-50.Document 3:ThomasBrauner, XiongwenZhao.ANovelCarrierSuppressionMethodforRFID [J] .IEEEMicrowaveandWirelessComponentsLetters.March2009.19 (3) .pp:128-130. discloses and forms the Directional Coupling Optic carrier cancellation circuit of reflecting modulator by PIN diode, the carrier wave of receiving terminal is suppressed 42dB.Document 4:WanKyuKim, MoonQueLee, JinHyunKimetcs.APassiveCirculatorforRFIDApplicationwithH ighIsolationusingaDirectionalCoupler [C] .Proceedingsofthe36
theuropeanMicrowaveConference.September2006.ManchesterUK.p p:196-199. discloses the carrier wave arrester 45dB that made the carrier wave of receiving terminal suppressed formed with directional coupler.Document 5:PengBai, YingzengYinandXiYang.ANovelRx-TxFront-EndsforPassiveRFID ReaderwithHighIsolation [C] .IEEE2007InternationalSymposiumonMicrowave, Antenna, Propagation, andEMCTechnologiesforWirelessCommunications.pp:332-335. propose the carrier cancellation circuit of branch's line style, receive-transmit isolation reaches 46dB.Document 6:Ting-wenXiong; XiTan; Jing-tianXi; HaoMin.HighTX-to-RXIsolationinUHFRFIDUsingNarrowbandLeak ingCarrierCanceller [J] .IEEEMicrowaveandWirelessComponentsLetters.2010.20 (2): 124-126. proposes with directional coupler, the narrowband carrier that the device such as circulator and power divider is formed reveals arrester, reach good performance, but circuit is complicated, and cost is higher.
Summary of the invention
The object of the present invention is to provide a kind of simple, be easy to realize, production cost is low, and isolation is high, can with circuit board conformal, based on the arrowband read write line carrier wave leakage Canceller of annular bridge.
A kind of narrowband carrier of the present invention leaks arrester, it is characterized in that described narrowband carrier leaks arrester and is made up of an annular bridge coupler and a reflective network circuit, wherein: annular bridge coupler arranges a conductive layer in the one side of an insulating barrier, arranging a girth with four ports on it at the another side of this insulating barrier is 1.5 times of wavelength X annular conductive rings, λ is the operation wavelength of uhf band radio-frequency recognition system, the width of ring is 2.3mm, each port separation distance is from being 1/4th wavelength X, distance between port one to port 4 is 3/4ths wavelength X, the width of port is 4mm, the length of port is suitable for being connected with other device, set conductive layer is all parallel with surface of insulating layer with conducting ring plane, reflective network circuit is made up of the resistance of parallel connection, electric capacity and inductance, and resistance capacitance and inductance one termination 4 port, the in addition direct ground connection in one end.
It also can be arrange a conductive layer in the one side of an insulating barrier that narrowband carrier of the present invention leaks annular bridge arrester, arranging a radius at the another side of this insulating barrier is 3 λ/4 π, arc length is the conducting ring that the circular arc of 3 λ/4 and the S shape formed by three crossing small semicircle rings of arcs intersect are therewith formed, three smaller part annulus total lengths are wherein 3 λ/4, the diameter of each small arc-shaped is equal to λ/2 π, ring width is 2.3mm, each port separation distance is from being 1/4th wavelength X, distance between port one to port 4 is 3/4ths wavelength X, the width of port is 4mm, the length of port is suitable for being connected with other device, set conductive layer is all parallel with surface of insulating layer with conducting ring plane, reflective network circuit is made up of the resistance of parallel connection, electric capacity and inductance, and resistance capacitance and inductance one termination 4 port, the in addition direct ground connection in one end.
The narrowband carrier of the invention described above leaks in arrester, and the dielectric layer of annular bridge coupler and conductive layer are double-side copper-applying dielectric-slab, and conducting ring is by scribing or corroding formation; In reflective network circuit, the resistance of resistance is R=50 Ω, and inductance is L=60nH, and electric capacity is C=0.5pF.
The present invention utilizes the feature of annular bridge, make use of the phase difference of each port simultaneously, by regulating the reflection coefficient of annular bridge the 4th port, finally reaches the object eliminated and reveal carrier wave.In addition in order to realize miniaturization, annular conducting ring being changed into the S shape structure connected with three small semicircles, while ensureing its function, obviously can reduce the size of whole device.
Compared with prior art, the invention has the advantages that:
1) structure is simple, cost is low, need any components and parts hardly, only need the copper sheet on circuit board and three RLC discrete components, it can be made of one with arrowband transmission circuit circuit board, make the present invention become a part of arrowband transmission circuit, element and existing arrowband transmission circuit that also can be independent use.
2) arrowband transmission circuit can be made to have high isolation after adopting the present invention, read write line high receiving sensitivity and the remote demand identified can be met completely.
3) the present invention is specially adapted in the UHFRFID system of China.
Accompanying drawing explanation
Fig. 1 is the first structural conductive ring-shaped schematic diagram of the present invention.
Fig. 2 is the second structural conductive ring-shaped schematic diagram of the present invention.
Fig. 3 represents the circuit diagram of the reflective network of 4 ports
Fig. 4 is the data of software emulation, is expressed as the transmission coefficient curve of transmitter to antenna end, illustrates the transmission relation of transmitter to antenna.
Fig. 5 represents the relation of the isolation between Receiver And Transmitter.
Fig. 6 represents the signal spectrum that receiver receives, and represents that described miniaturized annular bridge carrier wave arrester launches continuous carrier at transmitter, after antenna receives amplitude-modulated signal, and the power spectrum signal of receiving loop.
Fig. 7 receiving loop is in the test result of the leakage carrier spectrum at 920MHz place.
Fig. 8 receiving loop is in the test result of the leakage carrier spectrum at 925MHz place.
Fig. 9 receiving loop is in the test result of the leakage carrier spectrum at 922.5MHz place.
In above-mentioned figure, black part is conducting ring, and 1,2,3 and 4 are the port on conducting ring, the A map interlinking 1 in Fig. 2 or the port 4 of Fig. 2.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated.The present invention is actually a kind of passive microstrip structure annular bridge carrier cancellation circuit.
Fig. 1 and Fig. 2 is two kinds of conductive ring structure schematic diagrames of the present invention, and the mode that it corrodes in the one side of double-side copper-applying dielectric-slab forms conducting ring, and its another side is the substrate of the ground connection that conductive layer is formed.Thickness of dielectric layers used in an embodiment of the present invention
h=1.5
mm, relative dielectric constant
ε=2.65.
In the first structure of the present invention that Fig. 1 provides, circle diameter is
, be applicable to the read write line of 920MHz-925MHz scope in uhf band.
The radius of more than half annulus in the first structure of the present invention that Fig. 2 provides
r=53
mm, the radius of smaller part annulus
r=
r/ 3, the width of large semicircular ring and three little micro-bands of semicircular ring, the width of four port microstrips
w=4
mm, the length of port microstrip
l=2
mm, this embodiment is the read write line being applicable to 920MHz-925MHz scope in uhf band equally.
The circuit of Fig. 3 forms a RLC reflective network by resistance, electric capacity and inductance, and wherein each element is: R=50 Ω, L=60nH, C=0.5pF.In use continuous wave signal is input to the carrier wave arrester of distortion from the port one of Fig. 1 or Fig. 2, and output to antenna from the port 2 of Fig. 1 or Fig. 2, transmission characteristic as shown in Figure 3.Received signal strength is inputted by the antenna end of the port 2 of Fig. 1 or Fig. 2, receiving loop is outputted to from the port 3 of Fig. 1 or Fig. 2, simultaneously be leaked to the continuous carrier of port 3 in receiving loop ports having 1 and be reflected back the continuous carrier of 3 mouthfuls due to the imperfect coupling of antenna end, reveal to offset these, port 4 shown in Fig. 1 or Fig. 2 is connected with the A of Fig. 3, the continuous carrier being reflected back port 2 is just eliminated with the carrier wave revealed, by regulating the reflection coefficient of port 4, the value of resistance, inductance and electric capacity in Fig. 3 is namely regulated to be applicable to the read write line of different frequency scope.Isolation relation between transmitter and receiver is as Fig. 4.In Fig. 3, in the frequency band of 920MHz to 925MHz, the carrier wave arrester insertion loss of this distortion only has 3dB.In Fig. 4, the isolation S (3,1) of receiving terminal and transmitting terminal is-83dB at center frequency point 922.5M place, and stopping frequency place in initial sum is-55dB.
Fig. 5 is the frequency diagram of the actual Received signal strength of final receiving terminal, and as we know from the figure, the annular bridge carrier wave of the present invention's distortion suppresses circuit that the carrier wave that receiving loop is revealed is suppressed to-53dBm.Can improve read write line receiving sensitivity, the reading distance of increase and label, can meet the demand of Chinese uhf band rfid system.
In the testing scheme of specific embodiment of the present invention, antenna 50 ohm load replace antenna, radio-frequency signal source connects port one as continuous wave generator, spectrum analyzer connects port 3 as receiver, port 4 controls the size of reflected signal by reflective network, can test the carrier wave size that receiving loop finally leaks like this.The carrier power of leaking at side frequency 920MHz place, arrowband in Fig. 7 has been suppressed to-61dBm, at side frequency 925MHz place, arrowband in Fig. 8, the carrier power of leaking is suppressed to-69dBm,-74dBm has been suppressed in centre frequency place carrier power in Fig. 9, and using the read write line of traditional circulator in the carrier leakage power of centre frequency place receiving loop up to-11dBm, the annular bridge of distortion is compared with circulator and is suppressed to improve 63dB by carrier wave.
The foregoing is only an embodiment; certainly; the present invention can also have other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art can according to the various corresponding distortion of the invention process, but these change accordingly and distortion all should belong to the protection range of the claims in the present invention.
Claims (4)
1. a narrowband carrier leaks arrester, it is characterized in that described narrowband carrier leaks arrester and is made up of an annular bridge coupler and a reflective network circuit, wherein: annular bridge coupler arranges a conductive layer in the one side of an insulating barrier, arranging a girth with four ports on it at the another side of this insulating barrier is 1.5 times of wavelength X annular conductive rings, λ is the operation wavelength of uhf band radio-frequency recognition system, the width of ring is 2.3mm, each port separation distance is from being 1/4th wavelength X, that is: port one and port 2, port 2 and port 3, the arc length distance of port 3 and port 4 is 1/4th wavelength X, arc length distance between port one to port 4 is 3/4ths wavelength X, the width of four ports is 4mm, the length of port is suitable for being connected with other device, set conductive layer is all parallel with surface of insulating layer with conducting ring plane, reflective network circuit is made up of the resistance of parallel connection, electric capacity and inductance, and resistance capacitance and inductance one termination port 4, the in addition direct ground connection in one end.
2. a kind of narrowband carrier according to claim 1 leaks arrester, and it is characterized in that the dielectric layer of described annular bridge coupler and conductive layer are double-side copper-applying dielectric-slab, conducting ring is by scribing or corroding formation; In described reflective network circuit, the resistance of resistance is R=50 Ω, and inductance is L=60nH, and electric capacity is C=0.5pF.
3. a narrowband carrier leaks arrester, it is characterized in that described narrowband carrier leaks arrester and is made up of an annular bridge coupler and a reflective network circuit, wherein: annular bridge coupler arranges a conductive layer in the one side of an insulating barrier, the conducting ring that the S shape formed by three crossing small semicircle rings arranging a radius is 3 λ/4 π, arc length is 3 λ/4 circular arc and arcs intersect therewith at the another side of this insulating barrier is formed, three smaller part annulus total lengths are wherein 3 λ/4, the diameter of each small arc-shaped is equal to
ring width is 2.3mm, each port separation distance is from being 1/4th wavelength X, that is: the arc length distance of port one and port 2, port 2 and port 3, port 3 and port 4 is 1/4th wavelength X, arc length distance between port one to port 4 is 3/4ths wavelength X, the width of port is 4mm, and the length of port is suitable for being connected with other device, and set conductive layer is all parallel with surface of insulating layer with conducting ring plane; Reflective network circuit is made up of the resistance of parallel connection, electric capacity and inductance, and resistance capacitance and inductance one termination port 4, the in addition direct ground connection in one end.
4. a kind of narrowband carrier according to claim 3 leaks arrester, and it is characterized in that the dielectric layer of described annular bridge coupler and conductive layer are double-side copper-applying dielectric-slab, conducting ring is by scribing or corroding formation; In described reflective network circuit, the resistance of resistance is R=50 Ω, and inductance is L=60nH, and electric capacity is C=0.5pF.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410079144.0A CN103888202B (en) | 2014-03-05 | 2014-03-05 | A kind of narrowband carrier leaks arrester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410079144.0A CN103888202B (en) | 2014-03-05 | 2014-03-05 | A kind of narrowband carrier leaks arrester |
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| CN103888202A CN103888202A (en) | 2014-06-25 |
| CN103888202B true CN103888202B (en) | 2015-12-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112505376B (en) * | 2020-12-31 | 2024-06-11 | 西安开容电子技术有限责任公司 | Load for power line information leakage prevention test |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101931472A (en) * | 2009-06-10 | 2010-12-29 | 中国科学院自动化研究所 | Benchmark test system and method for adjacent channel interference resisting capacity of RFID reader-writer |
| CN102377450A (en) * | 2010-08-20 | 2012-03-14 | 中兴通讯股份有限公司 | System and method for suppressing carrier leakage |
| CN203840351U (en) * | 2014-03-05 | 2014-09-17 | 兰州大学 | Narrow-band carrier wave leakage eliminator |
-
2014
- 2014-03-05 CN CN201410079144.0A patent/CN103888202B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101931472A (en) * | 2009-06-10 | 2010-12-29 | 中国科学院自动化研究所 | Benchmark test system and method for adjacent channel interference resisting capacity of RFID reader-writer |
| CN102377450A (en) * | 2010-08-20 | 2012-03-14 | 中兴通讯股份有限公司 | System and method for suppressing carrier leakage |
| CN203840351U (en) * | 2014-03-05 | 2014-09-17 | 兰州大学 | Narrow-band carrier wave leakage eliminator |
Non-Patent Citations (1)
| Title |
|---|
| 新型三频环形耦合器的设计;林峰等;《华南理工大学学报》;20110731;第39卷(第7期);第26-30页 * |
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Granted publication date: 20151202 Termination date: 20180305 |