CN103618139A - Method and device for decoupling radio frequency antenna - Google Patents
Method and device for decoupling radio frequency antenna Download PDFInfo
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- CN103618139A CN103618139A CN201310667669.1A CN201310667669A CN103618139A CN 103618139 A CN103618139 A CN 103618139A CN 201310667669 A CN201310667669 A CN 201310667669A CN 103618139 A CN103618139 A CN 103618139A
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Abstract
The invention relates to the technical field of radio frequency communication, and specifically relates to a method and a device for decoupling a radio frequency antenna in a radio frequency antenna array especially applicable to a radio frequency identification system; the method is characterized in that a radio frequency signal to be sent to an antenna coil is decoupled by a decoupling circuit, and then emitted by the antenna coil after being processed by an impedance conversion circuit and a resonant transformation circuit in sequence, wherein a to-be-sent radio frequency signal is sent to/sent out of the decoupling circuit by a radio frequency transmission line; and sum of length of an equivalent radio frequency signal transmission line of the decoupling circuit and length of the radio frequency signal transmission line connected with the two ends of the decoupling circuit is integer multiple a half wavelength of the radio frequency signal. Compared with the prior art, the method disclosed by the invention can effectively lower loss and improve detecting accuracy of the radio frequency identification system.
Description
Technical field
The present invention relates to technology for radio frequency field, specifically a kind of radio-frequency antenna decoupling method and device that is specially adapted to the radio-frequency antenna array in radio-frequency recognition system.
Background technology
As everyone knows, radio-frequency antenna is the important component part of radio-frequency recognition system, it completes transmitting and receiving of radiofrequency signal in radio-frequency recognition system, when two (or more) antenna sets become aerial array, correlation between two antennas can increase, this just causes the degree intercoupling between antenna to be strengthened, and brings adverse effect to system identification efficiency.
In existing application, the coupling solving between antenna mainly contains following three kinds of methods: the first is in aerial coil, to increase switching device, closed and the shutoff by control switch device, realize the uncoupling of radio-frequency antenna, but this method can increase system complex degree and control difficulty, raising system is produced and maintenance cost, and conventional switching device has mechanical type and semiconductor-type, mechanical switch is limited useful life, and semiconductor-type switch high-frequency characteristic is poor, insertion loss, reflection coefficients etc. are larger, the introducing of these two kinds of switching devices all can cause comparatively adverse influence to radio frequency signal transmission system, therefore the use limitation of insertion switch device is larger, the second is by allowing radio-frequency antenna in working frequency points off resonance uncoupling, in the application of existing technology, often adopt in radio-frequency antenna circuit or antenna circuit increases detuned circuit outward, by in the work of different time whether controlling this detuned circuit, realize the uncoupling of antenna, but this method can reduce quality factor and the efficiency of transmission of radiofrequency signal, increase and control complexity and the difficulty of processing, the third is the method uncoupling by signal in orthogonal, this method is had relatively high expectations to radio frequency antenna transmission orthogonal signalling, the quantity of radio frequency aerial array application is had to larger restriction simultaneously, the restriction of the very big degree of generation of varying number orthogonal signalling the range of application of the method, therefore, how providing the antenna uncoupling method of a kind of low-loss, high stability, applicable multi-antenna array application is industry problem demanding prompt solution.
Summary of the invention
The present invention is directed to the shortcoming and defect that prior art exists, propose a kind ofly can solve the energy loss problem that causes because of coupling in radio-frequency antenna arrayed applications process and radio-frequency antenna decoupling method and the device of accuracy decline problem.
The present invention reaches by following measures:
A kind of radio-frequency antenna decoupling method, it is characterized in that the radiofrequency signal that will be sent to aerial coil is first after the decoupling of uncoupling circuit is processed, through impedance inverter circuit, resonant transform circuit, process and launch by aerial coil successively again, wherein coupling circuit is sent into/gone out to radiofrequency signal to be sent through radio-frequency transmission line, and the radio frequency signal transmission line length of uncoupling circuit equivalent is the integral multiple of radiofrequency signal 1/2nd wavelength with the length sum of uncoupling circuit radio frequency signal transmission line that two ends are connected.
A kind of radio-frequency antenna uncoupling device, comprise radio frequency module for reading and writing, plural match circuit and plural aerial coil, wherein match circuit and aerial coil connect one to one, it is characterized in that being provided with uncoupling circuit, the radiofrequency signal output of radio frequency module for reading and writing is connected with the input of uncoupling circuit, match circuit is by impedance inverter circuit, resonant transform circuit is connected, the output of uncoupling circuit is connected with the impedance inverter circuit in plural match circuit respectively, the output of the resonant transform circuit in match circuit is connected with aerial coil.
In the present invention, in uncoupling circuit, be provided with inductance, capacity cell, uncoupling circuit adopts LC to form the L-type circuit of pi-network or LC composition or the T-shaped circuit that LC forms, or the combinational circuit of foregoing circuit, complete in the course of the work radio frequency signal transmission line bandwidth, quality factor, impedance, phase shift, the isoparametric equivalence of reflection coefficient, and effectively realize the reduction of insertion loss.
Middle impedance translation circuit of the present invention is realized by transformer type translation circuit, and primary coil and secondary coil collaborative work, complete the impedance matching of radiofrequency signal; Resonant transform circuit adopts LC series resonance or LC parallel resonance mode to realize.
The present invention compared with prior art, has the following advantages: (1) decoupling successful: adopt the transmission line principle of equal effects, coordinate special matched circuit form, can fundamentally remove coupled problem; (2) loss is low, energy transmission efficiency is high: on the basis that does not increase detuned circuit and length of transmission line, adjust match circuit form and each parameter, reach uncoupling effect, remove the loss that additional detuned circuit brings; (3) succinct, applied range: circuit form is succinct, is applicable to the combination of small number radio-frequency antenna and multi-antenna array and uses; (4) stability is high: the removal of radiofrequency signal coupling, can not only improve the capacity usage ratio of whole system, and the stability that can also improve system is simultaneously accuracy.
accompanying drawing explanation:
Accompanying drawing 1 is the structural representation of embodiment 1 in the present invention.
Accompanying drawing 2 is the another kind of structural representations of embodiment 1 in the present invention.
Accompanying drawing 3 is a kind of structural representations of uncoupling circuit and match circuit in the present invention.
Accompanying drawing 4 is a kind of structural representations of uncoupling circuit and match circuit in the present invention.
Accompanying drawing 5 is a kind of structural representations of uncoupling circuit and match circuit in the present invention.
Accompanying drawing 6 is a kind of structural representations of uncoupling circuit and match circuit in the present invention.
Accompanying drawing 7 is a kind of structural representations of uncoupling circuit and match circuit in the present invention.
Accompanying drawing 8 is a kind of structural representations of uncoupling circuit and match circuit in the present invention.
Accompanying drawing 9 is a kind of structural representations of uncoupling circuit and match circuit in the present invention.
Reference numeral: radio frequency module for reading and writing 1, power divider 2, uncoupling circuit 3, match circuit 4, aerial coil 5, impedance inverter circuit 6, resonant transform circuit 7.
embodiment:
Below in conjunction with drawings and Examples, the present invention is further illustrated.
As shown in drawings, in the present invention, uncoupling circuit can adopt I, II, and III, IV, V, VI, any one in several structures of VII, is described respectively below.
embodiment 1:
As shown in Figure 1, the present invention proposes a kind of radio-frequency antenna decoupling method and device, be provided with the radio frequency module for reading and writing 1 for generation of radio frequency read/write signal, for the radiofrequency signal of radio frequency module for reading and writing 1 output being divided into the power divider 2 of multichannel, the uncoupling circuit 3 being connected with power divider 2 outputs, the plural match circuit 4 being connected with uncoupling circuit 3 outputs, the plural aerial coil 5 connecting one to one with plural match circuit 4 respectively;
Wherein the radiofrequency signal of radio frequency module for reading and writing 1 output is sent into power divider 2 through radio frequency signal transmission line, through power divider 2, be divided into after multichannel, send into uncoupling circuit 3, uncoupling circuit 3 is sent the radiofrequency signal after processing into match circuit 4 through radio frequency signal transmission line again, herein according to the concrete needs of implementing, the radiofrequency signal of radio frequency module for reading and writing 1 output can directly be sent into uncoupling circuit 3 through radio frequency signal transmission line, as shown in Figure 2;
Now when certain (or certain is several) antenna is in running order, radiofrequency signal is sent by radio frequency module for reading and writing 1, directly (or through power divider 2) transfers to antenna radio-frequency signal input, radiofrequency signal enters after antenna, after match circuit completes impedance matching, through aerial coil by emission of radio frequency signals to area of space, and then complete reading of this space label; When antenna is during in off position, the radio-frequency (RF) output end of these antenna prime parts (radio frequency module for reading and writing 1 or power divider 2) is off state, if (wherein S represents radio frequency signal transmission line length to be now connected to the radio frequency signal transmission line length of antenna radio-frequency signal input, λ is the wavelength of radiofrequency signal while transmitting in radio frequency signal transmission line, n is natural number), according to the transmission line theory that opens circuit, being now equivalent to antenna radio-frequency signal input is off state; In view of in actual application, use the radio frequency signal transmission line limitation of radiofrequency signal wavelength 1/2nd integral multiple length larger, therefore adopt uncoupling circuit 3 equivalent length-specific radio frequency signal transmission line characteristics.
Whole device is when normal operation, be in circuit, to have in the process of radio signal transmission, radiofrequency signal enters uncoupling circuit 3 by radio frequency signal transmission line, uncoupling circuit 3 is the match circuit 4 to radio-frequency antenna by this radio signal transmission, after the impedance matching of match circuit 4, radiofrequency signal exports aerial coil 5 to, and coil to aerial, completes reading of this region label by emission of radio frequency signals, whole circuit is not when working, connect radio frequency module for reading and writing 1(or power divider 2) the A end of radio frequency signal transmission line be off state, now radio frequency signal transmission line and uncoupling circuit 3 are equivalent to the radio frequency signal transmission line of radiofrequency signal 1/2nd wavelength integral multiple length completely, now the rf inputs of match circuit 4 middle impedance translation circuits is equivalence open circuit (transmission line that opens circuit that is external radiofrequency signal wavelength 1/2nd integral multiples), by aerial coil end, to impedance inverter circuit, seen, impedance inverter circuit is in mismatch Conditions, under this state, in also can focused energy aerial array application process when this antenna around has radiofrequency signal, the antenna of the not working radiofrequency signal that work antenna is launched that is not coupled, reach antenna uncoupling object.
embodiment 2:
As shown in Figure 3, in the present invention, uncoupling circuit I adopts LC to form pi-network, and the impedance inverter circuit 6 in match circuit 4 adopts transformer circuit structure, and resonant transform circuit 7 adopts electric capacity to realize;
When adopting said structure, the dual-port decoupling network that in uncoupling circuit I, LC forms, realizes the equivalence of the parameters such as bandwidth, quality factor, impedance, phase shift, reflection coefficient and radio frequency signal transmission line; The impedance inverter circuit that impedance inverter circuit 6 forms for transformer, difference by the primary and secondary coil ratio of transformer completes impedance matching, according to the power at the primary and secondary coil of transformer two ends, equate, both end voltage is than identical with turn ratio, the characteristic impedance of radio frequency signal transmission line is 50 Ω, simultaneously according to horse-power formula, can learn that impedance transformation ratio that impedance matching circuit completes is turn ratio square; The parallel connection type resonant circuit of resonant transform circuit for being formed by LC, in circuit, L is that aerial coil self inductance participates in this circuit resonance, from LC parallel resonance with reference to LC resonant frequency equation, external building-out capacitor C is that aerial coil inductance value is relevant with resonance frequency, for example resonance point is 13.56MHz, aerial coil inductance is 3 μ H, and now building-out capacitor capacitance should be 46pF.
embodiment 3:
As shown in accompanying drawing 4 and accompanying drawing 5, in the present invention, uncoupling circuit II and uncoupling circuit III adopt LC to form L-type circuit, and the two-port network place in circuit system that this uncoupling circuit form forms, reaches uncoupling effect.In described circuit, series inductance L realizes the conversion such as phase place, impedance, each circuit parameter of ground capacity C1 compensated regulation.The debugging simple in structure, convenient of this uncoupling circuit form and application.
embodiment 4:
As shown in Figure 6, in the present invention, uncoupling circuit IV adopts LC to form T-shaped circuit, and L1, L2 and C1 are used in conjunction with each other and realize uncoupling effect, and the negative resistance effect of T-shaped circuit can improve the Q value of this circuit preferably, improves Circuits System stable type.
embodiment 5:
As shown in accompanying drawing 7 and accompanying drawing 8, in the present invention, uncoupling circuit V and uncoupling circuit VI adopt LC to form compound type circuit, and above-mentioned compound uncoupling circuit can be regarded the equivalence of following several forms as: the combination of double L-shaped uncoupling circuit, L-type and the combination of T-shaped uncoupling circuit, L-type and pi-network combination.Above-mentioned compound uncoupling circuit has advantages of combined citation form, has the stability of change simultaneously.
embodiment 6:
As shown in Figure 9, in the present invention, uncoupling circuit VII adopts LC to form compound circuit, and above-mentioned compound uncoupling circuit can be regarded the equivalence of following several forms as: the combination of two π type uncoupling circuit, L-type and pi-network combination, L-type and T-shaped and L-type uncoupling circuit combination.Above-mentioned compound uncoupling circuit has advantages of combined citation form, has the stability of change simultaneously.
the present invention compared with prior art, has the following advantages: (1) decoupling successful: adopt the transmission line principle of equal effects, coordinate special matched circuit form, can fundamentally remove coupled problem; (2) loss is low, energy transmission efficiency is high: on the basis that does not increase detuned circuit and length of transmission line, adjust match circuit form and each parameter, reach uncoupling effect, remove the loss that additional detuned circuit brings; (3) succinct, applied range: circuit form is succinct, is applicable to the combination of small number radio-frequency antenna and multi-antenna array and uses; (4) stability is high: the removal of radiofrequency signal coupling, can not only improve the capacity usage ratio of whole system, and the stability that can also improve system is simultaneously accuracy.
Claims (4)
1. a radio-frequency antenna decoupling method, it is characterized in that the radiofrequency signal that will be sent to aerial coil is first after the decoupling of uncoupling circuit is processed, through impedance inverter circuit, resonant transform circuit, process and launch by aerial coil successively again, wherein coupling circuit is sent into/gone out to radiofrequency signal to be sent through radio-frequency transmission line, and the radio frequency signal transmission line length of uncoupling circuit equivalent is the integral multiple of radiofrequency signal 1/2nd wavelength with the length sum of uncoupling circuit radio frequency signal transmission line that two ends are connected.
2. a radio-frequency antenna uncoupling device, comprise radio frequency module for reading and writing, plural match circuit and plural aerial coil, wherein match circuit and aerial coil connect one to one, it is characterized in that being provided with uncoupling circuit, the radiofrequency signal output of radio frequency module for reading and writing is connected with the input of uncoupling circuit, match circuit is by impedance inverter circuit, resonant transform circuit is connected, the output of uncoupling circuit is connected with the impedance inverter circuit in plural match circuit respectively, the output of the resonant transform circuit in match circuit is connected with aerial coil.
3. a kind of radio-frequency antenna uncoupling device according to claim 2, is characterized in that being provided with inductance, capacity cell in uncoupling circuit, and uncoupling circuit adopts LC to form the L-type circuit of pi-network or LC composition or the T-shaped circuit that LC forms.
4. a kind of radio-frequency antenna uncoupling device according to claim 2, it is characterized in that impedance inverter circuit is realized by transformer type translation circuit, primary coil and secondary coil collaborative work, complete the impedance matching of radiofrequency signal, resonant transform circuit adopts LC series resonance or LC parallel resonance mode to realize.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310667669.1A CN103618139B (en) | 2013-12-07 | 2013-12-07 | Radio-frequency antenna decoupling method and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310667669.1A CN103618139B (en) | 2013-12-07 | 2013-12-07 | Radio-frequency antenna decoupling method and device |
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| CN103618139A true CN103618139A (en) | 2014-03-05 |
| CN103618139B CN103618139B (en) | 2016-08-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108663642A (en) * | 2017-03-31 | 2018-10-16 | 西门子(深圳)磁共振有限公司 | A kind of the tuning detuning structure and detuning method of radio-frequency coil |
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| CN101427419A (en) * | 2006-04-28 | 2009-05-06 | 艾利森电话股份有限公司 | Method and device for coupling cancellation of closely spaced antennas |
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| CN2790007Y (en) * | 2005-04-30 | 2006-06-21 | 张雷 | GPS active antenna interface antisurging shock device |
| CN101427419A (en) * | 2006-04-28 | 2009-05-06 | 艾利森电话股份有限公司 | Method and device for coupling cancellation of closely spaced antennas |
| US20100248651A1 (en) * | 2009-03-27 | 2010-09-30 | Telefonaktiebolaget Lm Ericsson (Publ) | Antenna Matching for MIMO Transceivers |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108663642A (en) * | 2017-03-31 | 2018-10-16 | 西门子(深圳)磁共振有限公司 | A kind of the tuning detuning structure and detuning method of radio-frequency coil |
| US10677864B2 (en) | 2017-03-31 | 2020-06-09 | Siemens Healthcare Gmbh | Tuning/detuning circuit and detuning method for an RF coil |
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| CN103618139B (en) | 2016-08-17 |
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