CN101246540A - Compensation process of ultra-high frequency RFID label reading device, reading device and radio frequency front end thereof - Google Patents
Compensation process of ultra-high frequency RFID label reading device, reading device and radio frequency front end thereof Download PDFInfo
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Abstract
The invention discloses a leakage compensation method for UHF RF electron tag reader and an RF front end of the UHF RF electron tag reader which is used to achieve the compensation method, which is belonged to the field of wireless RF technology. The core of the invention is as following: using two ring isolation or coupler, through controlling device layout and PCB-board alignment, obtaining the same signal delay two signals, one single is useful signal stacked leakage signal, the other single is compensation signal which has the same size and amplitude with leakage signal, the two signal pathway through the low noise amplifier to do cut operation, then the leakage signal can be got rid of, thus obtaining clean useful signal in the front-end of RF, and enhancing sensitivity of the UHF RF electron tag reader, And greatly reduce design difficulty of each circuit module of traditional reader structure, more easy to implement system monolithic integration of RF electron tag reader system.
Description
Technical field
The invention relates to the leakage compensation method of link in the wireless radio-frequency field, specifically, be about super high frequency radio frequency electronic label reader (UHF RFID Reader, Ultra High Frequency Ratio-FrequencyIdentification) leakage compensation method, and the radio-frequency front-end that the super high frequency radio frequency electronic label reader of the above-mentioned compensation method of a realization is provided.
Background technology
In recent years, radio-frequency (RF) tag recognition technology (RFID, Ratio-Frequency Identification) at home and abroad received much concern because of its great potential of using at aspects such as logistics and supply chain management.The coding techniques of RFID makes any in the world article that oneself " identification number " all be arranged, RFID can read " identification number " of article automatically and its relevant information is handled, set up " suspended net " by network, the foundation of " suspended net " has revolutionary meaning to logistics and supply chain management.In logistics and supply chain management, the accuracy of information and promptness are the most key, and automatic recognition capability and the administrative skill of RFID can provide sufficient assurance to this.RFID improves the transparency of supply chain greatly, article can supply chain Anywhere by real-time tracking.To improving the yield-power of production and circulation industry, expanding competence for added value has immeasurable potentiality.Be not only in logistics and supplies management field, the RFID technology is a technology can challenging your imagination.Following product design is produced, and sell, and people's life pattern all might profoundly be changed.Except the application of logistics and supply chain management, RFID can also be widely used in as, manufacture and assembling, aviation luggage is handled, and mail/fast freight parcel is handled document tracking/library management, the animal identification sign, gate inhibition's control/electronic entrance ticket, various fields such as the automatic charge of road.
In rfid system, for 13.5MHz and more low-frequency system, superelevation REID (UHFRFID), because the frequency range of its working electromagnet ripple is near (is 920-925MHz and 840-845MHz for the Chinese Industrial Standards (CIS)) 900MHz, the electromagnetic wavelength of this frequency range is shorter, therefore label can adopt very little antenna receiving signal relatively, thereby for the miniaturization of label and low cost are laid a good foundation, therefore super high frequency radio frequency recognition technology (UHF RFID) is the direction of giving priority in recent years, and super high frequency radio frequency recognition technology UHF RFID will be expected to develop to the frequency of operation of 2.45GHz from 900MHz frequency of operation now.
For the UHF rfid system briefly, by label (tag), label reader (Reader) and application software platform constitute.Label and label reader (Reader) are the hardware foundations of UHF rfid system.The basic functional principle of UHF rfid system is roughly as follows: (1) reader Reader launching electromagnetic wave is given label Tag, and label Tag is carried out instruction control, and information writes and operation such as reads; (2) label Tag receives the electromagnetic wave signal that reader Reader emission comes on the one hand; On the other hand, for passive label Tag, the electromagnetic wave that utilizes reader Reader emission is converted into direct supply voltage, as the working power of label Tag; (3) label Tag returns the communication mechanism of reader Reader and is, Tag returns to reader Reader by backward scattering mechanism with the information of label with the electromagnetic wave of Reader emission.
Characteristics of the communication mechanism of UHF RFID are that the signal that the signal of the transmitting chain emission of reader Reader and reception link receive has the electromagnetic carrier of same frequency.For the wireless communication system that is applicable to miniaturization and portable equipment, transmitting chain and the shared antenna of reception link adopt coupling mechanism (coupler) or circulator/isolator (circulator) to isolate between them; But because the impedance mismatching that antenna certainly exists, and coupling mechanism (coupler) and the limited isolation of circulator/isolator (circulator), reader Reader transmitting chain must have signal leakage to receiving in the link, as shown in Figure 1, the carrier wave that has same frequency from the useful signal of label Tag in this leakage signal and the reception link, and more a lot of greatly than useful signal intensity.These characteristics promptly are the difficult points of super high frequency radio frequency electronic label reader (UHF RFIDReader).On the one hand, the existence of this leakage signal has proposed very high linearity requirement to radio-frequency front-end (comprising low noise amplifier LNA, frequency mixer Mixer etc.); On the other hand when leakage signal through after the Mixer frequency conversion, will become the leakage signal of a very big DC component, thereby this DC component will cause the analog baseband circuitry of back to be easy to be fallen to be difficult to operate as normal by saturated.How this leakage signal than the big a lot of same frequency of useful signal being removed, and avoided interference to useful signal, is a big difficult point and a challenge of reader design.
The structure of traditional label reader adopts high-resolution digital to analog converter (ADC) to solve to the signal leakage problem of transmitting terminal.Such solution has two problems: one if improve further that the sensitivity of reader means will more high-resolution ADC; Two, the linearity to frequency mixer and low noise amplifier has very high requirement in the design of reader radio-frequency front-end.Therefore this scheme and be not suitable for the design of the integrated reader of single-chip cheaply.
In the present disclosed patent, United States Patent (USP) (the patent No.: 6,686,830) utilize three ends, 1/8 wavelength transmission line to make to transmit and received signal forms differential signal, differential signal is through envelope detection, utilize transmitting that differential amplifier stops a leak then, but this method is subjected to the impedance influences of envelope detector bigger, and makes the differential signal imbalance, has limited the raising of the sensitivity of reader.
In the document of publishing at present, some is about UHF RFID Reader design proposal, wherein tool representative as document " I.Kipnis; S.Chiu; M.Loyer; J.Carrigan; J Rapp; P.Johansson, D.Westberg, J.Johansson, " A 900MHz UHF RFID Reader Transceiver IC ", IEEEInternational Solid-State Circuits Conference, 2007 "; adopt higher cost the BiCMOS technological design have the very radio-frequency (RF) front-end circuit of high linearity (LNA and Mixer), radio-frequency (RF) front-end circuit after, adopt electric capacity composition Hi-pass filter sheet outside then, thereby Mixer direct current leakage target signal filter afterwards fallen.The problem of this scheme is, the linearity of frequency mixer and low noise amplifier is still had very high requirement, is unfavorable for realizing whole CMOS chip cheaply.
Summary of the invention
The present invention has overcome deficiency of the prior art, provide a kind of about the super high frequency radio frequency electronic label reader the leakage compensation method and realize the radio-frequency front-end of the super high frequency radio frequency electronic label reader of above-mentioned compensation method, this radio-frequency front-end is highly sensitive, the circuit module designing requirement is low, and cost is low.
Technical scheme of the present invention is:
A kind of leakage compensation method of super high frequency radio frequency electronic label reader, its step comprises:
1) radio-frequency front-end of super high frequency radio frequency electronic label reader is provided with two circulator/isolators or coupling mechanism, and the input end of circulator/isolator A or coupling mechanism A is connected with antenna, and the input end of circulator/isolator B or coupling mechanism B is connected with 50 Ohmages;
2) the power amplifier output terminal with the super high frequency radio frequency electronic label reader is divided into two-way, one the road to circulator/isolator A or the output terminal of coupling mechanism A, another road is to the output terminal of circulator/isolator B or coupling mechanism B, the signal delay unanimity of the pcb board cabling of above-mentioned two-way;
3) coupled end of circulator/isolator A or coupling mechanism A connects the input end of low noise amplifier, and the coupled end of circulator/isolator B or coupling mechanism B connects the input offset end of low noise amplifier;
4) low noise amplifier is done the signal of the signal of input end and input offset end and is subtracted each other, and gets rid of the leakage signal of transmitting terminal.
A kind of radio-frequency front-end of super high frequency radio frequency electronic label reader comprises antenna, two circulator/isolators, power amplifier, low noise amplifier and the pcb board cablings between them,
Described antenna, an end are from space received RF RF signal and to the spatial emission radio frequency rf signal, and the other end links to each other with circulator/isolator A;
The output terminal of described circulator/isolator A is the transmitting of output of power amplifier, the coupled end output radio frequency rf signal that links to each other with the input end of low noise amplifier;
The input end of described circulator/isolator B links to each other with 50 Ohmages, and output terminal also is the transmitting of the output of power amplifier, and coupled end links to each other with the input offset end of low noise amplifier, exports compensating signal;
The coupled end of described circulator/isolator A is identical to the pcb board cabling signal delay of the coupled end of the pcb board cabling of low noise amplifier input end and described circulator/isolator B and low noise amplifier input offset end;
Described low noise amplifier, input end connects the coupled end of circulator/isolator A, received RF RF signal; The input offset end connects the coupled end of circulator/isolator B, receives the compensating signal that equates with leakage signal equal and opposite in direction, amplitude; The radio frequency rf signal of getting rid of leakage signal that the output terminal of described low noise amplifier output has been amplified.
The pcb board cabling of the output terminal to two of an above-mentioned power amplifier circulator/isolator output terminal can be symmetrical.
Or a kind of radio-frequency front-end of super high frequency radio frequency electronic label reader comprises antenna, two coupling mechanisms, power amplifier, low noise amplifier and the pcb board cablings between them,
Described antenna, an end are from space received RF RF signal and to the spatial emission radio frequency rf signal, and the other end links to each other with coupling mechanism A;
The output terminal of described coupling mechanism A is the transmitting of output of power amplifier, the coupled end output radio frequency rf signal that links to each other with the input end of low noise amplifier;
The input end of described coupling mechanism B links to each other with 50 Ohmages, and output terminal also is the transmitting of the output of power amplifier, and coupled end links to each other with the input offset end of low noise amplifier, exports compensating signal;
The coupled end of described coupling mechanism A is identical to the pcb board cabling signal delay of the coupled end of the pcb board cabling of low noise amplifier input end and described coupling mechanism B and low noise amplifier input offset end;
Described low noise amplifier, input end connects the coupled end of coupling mechanism A, received RF RF signal; The input offset end connects the coupled end of coupling mechanism B, receives the compensating signal that equates with leakage signal equal and opposite in direction, amplitude; The radio frequency rf signal of getting rid of leakage signal that the output terminal of described low noise amplifier output has been amplified.
In addition, the invention provides a kind of super high frequency radio frequency electronic label reader, comprise radio-frequency front-end, receive link, transmitting chain, digital signal processing circuit and some other auxiliary circuit module, radio-frequency front-end comprise antenna, two circulator/isolators, power amplifier, low noise amplifier and the pcb board cablings between them
One end of described antenna is from space received RF RF signal and to the spatial emission radio frequency rf signal, and the other end links to each other with circulator/isolator A;
The output terminal of described circulator/isolator A is the transmitting of output of power amplifier, the coupled end output radio frequency rf signal that links to each other with the input end of low noise amplifier;
The input end of described circulator/isolator B links to each other with 50 Ohmages, and output terminal also is the transmitting of the output of power amplifier, and coupled end links to each other with the input offset end of low noise amplifier, exports compensating signal;
The cabling signal delay of the power amplifier output terminal to two of a described transmission link circulator/isolator output terminal is identical;
The low noise amplifier of described reception link is imported the coupling end that an end connects circulator/isolator A, received RF RF signal; The input offset end connects the coupled end of circulator/isolator B, receives the compensating signal that equates with leakage signal equal and opposite in direction, amplitude; The radio frequency rf signal of getting rid of leakage signal that its output terminal output has been amplified.
Or, a kind of super high frequency radio frequency electronic label reader, comprise radio-frequency front-end, receive link, transmitting chain, digital signal processing circuit and some other auxiliary circuit module is characterized in that, radio-frequency front-end comprises antenna, two coupling mechanisms, power amplifier, low noise amplifier and the pcb board cablings between them
Described antenna, an end are from space received RF RF signal and to the spatial emission radio frequency rf signal, and the other end links to each other with coupling mechanism A;
The output terminal of described coupling mechanism A is the transmitting of output of power amplifier, the coupled end output radio frequency rf signal that links to each other with the input end of low noise amplifier;
The input end of described coupling mechanism B links to each other with 50 Ohmages, and output terminal also is the transmitting of the output of power amplifier, and coupled end links to each other with the input offset end of low noise amplifier, exports compensating signal;
The coupled end of described coupling mechanism A is identical to the pcb board cabling signal delay of the coupled end of the pcb board cabling of low noise amplifier input end and described coupling mechanism B and low noise amplifier input offset end;
Described low noise amplifier, input end connects the coupled end of coupling mechanism A, received RF RF signal; The input offset end connects the coupled end of coupling mechanism B, receives the compensating signal that equates with leakage signal equal and opposite in direction, amplitude; The radio frequency rf signal of getting rid of leakage signal that the output terminal of described low noise amplifier output has been amplified.
Above-mentioned reception link further also can comprise: the frequency mixer Mixer of I/Q two-way, the analog baseband circuitry of I/Q two-way and ADC analog to digital converter.
Above-mentioned transmitting chain further also can comprise: DAC digital to analog converter, analog baseband circuitry and frequency mixer Mixer.
Principle of work of the present invention is, digital signal processing circuit adopts OOK or ASK modulation system to modulate the signal on the transmitting chain, by the power amplifier amplifying signal, transmit by circulator/isolator or coupling mechanism (link is isolated with receiving), be transmitted to a day alignment spatial transmission.Signal arrives radio electronic label, and the mode of electronic tag information that it is entrained by backward scattering is loaded on this signal and by the space returns reader.The radio frequency rf signal that returns is received by reader by antenna, and the RF signal enters low noise amplifier through circulator/isolator (isolated with transmitting chain); Through I, the Q two-way carries out the signal demodulation, again through signal processing circuit, finishes the communication process of reader and label simultaneously.
When the useful signal that carries label information returns reader, the part energy that transmits of power amplifier output is owing to the mismatch of antenna impedance and limited also identical with the above-mentioned frequency useful signal stack of receiving end that leaks into reader of isolation of circulator/isolator, as shown in Figure 2.The useful signal that leakage signal intensity is returned much larger than label.The leakage signal of such stack enters radio-frequency front-end (comprising low noise amplifier and frequency mixer), and for fear of the distortion of useful signal, the linearity of radio-frequency front-end requires just very high, and this has brought very big difficulty for the design of radio-frequency front-end.If there is not this leakage signal, the requirement of the linearity just can be hanged down a magnitude.Simulating signal through demodulating after the frequency mixer down coversion still is superimposed upon one very on the low frequency signal of the formed approximate direct current of gross leak signal down coversion, this gross leak signal limitations the effective amplification of post-amplifier to useful signal, otherwise post-amplifier can be fallen the design difficulty that this has just limited the raising of reader sensitivity and has increased analog baseband circuitry greatly by saturated.
In order to address this problem, adopt described circulator/isolator or coupling mechanism and described antenna in the present invention, circulator/isolator, power amplifier, pcb board cabling between the low noise amplifier, by the layout of control device and the cabling of pcb board, picked up signal postpones the two paths of signals of identical (phase shift is identical), one the tunnel still for having superposeed the useful signal of leakage signal, another road is that compensating signal is (with the leakage signal equal and opposite in direction, amplitude is identical), two signal paths are done the phase reducing by described low noise amplifier, can get rid of leakage signal, thereby can obtain clean useful signal at radio-frequency front-end, as shown in Figure 4.Greatly reduce the requirement of radio-frequency (RF) front-end circuit like this to the linearity; Simultaneously big low frequency leakage signal after frequency mixer, do not occur yet, thereby greatly reduce the design difficulty of analog baseband circuitry; Thereby improved the sensitivity of reader.
Compared with prior art, the invention has the beneficial effects as follows:
1) utilize two circulator/isolators or coupling mechanism and obtain identical with the leakage signal phase place, equal-sized compensating signal with pcb board cabling between low noise amplifier, the power amplifier, usefulness removes the leakage signal that superposes in the useful signal;
2) greatly reduce the design difficulty of radio-frequency (RF) front-end circuit (comprising low noise amplifier and frequency mixer etc.) aspect the linearity;
3) avoided analog baseband circuitry by the saturated possibility of falling of big low frequency leakage signal, the space that makes analog baseband circuitry amplify useful signal strengthens greatly, and greatly reduces the design difficulty of analog baseband circuitry;
4) improved the sensitivity of reader;
5) reader help realizing cheaply the single-chip of whole CMOS integrated (SOC, system-on-chip).
Description of drawings
Fig. 1 is the synoptic diagram of the radio frequency electronic label reader of traditional structure;
Fig. 2 leaks to leakage signal that receives link and the useful signal that label returns stack signal envelope synoptic diagram (signal of low noise amplifier input end) afterwards by transmitting chain;
Fig. 3 is the system architecture synoptic diagram of super high frequency radio frequency electronic tag UHF RFID Reader of the present invention;
Fig. 4 is the emulation synoptic diagram of reader signal demodulation set forth in the present invention;
(1) the superposed signal envelope synoptic diagram (low noise amplifier input end) of leakage signal and useful signal;
(2) compensating signal envelope synoptic diagram (low noise amplifier input offset end);
(3) the signal envelope synoptic diagram of low noise amplifier output terminal (remove leakage signal, and useful signal is amplified);
Fig. 5 is the schematic flow sheet of the leakage compensation method of super high frequency radio frequency electronic label reader of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail:
The system architecture of radio frequency electronic label reader of the present invention comprises: antenna, circulator/isolator (circulator), receive link and (comprise low noise amplifier LNA, the frequency mixer Mixer of I/Q two-way, the analog baseband circuitry of I/Q two-way, the ADC analog to digital converter), transmitting chain (comprises the DAC digital to analog converter, analog baseband circuitry, frequency mixer Mixer, power amplifier), and digital signal processing circuit, some other auxiliary circuit module, and the pcb board cabling between the antenna, circulator/isolator, power amplifier, low noise amplifier.
Described antenna, an end are that the other end links to each other with circulator/isolator from space received RF RF signal and to the spatial emission radio frequency rf signal.
Described circulator/isolator will adopt two, input one end of one of them circulator/isolator A (circulator/isolator is three port devices) links to each other with antenna, export an end and be the transmitting of output of power amplifier, the end that is coupled links to each other output radio frequency rf signal (containing the useful signal that label that leakage signal, antenna receive returns) to low noise amplifier with the input end of low noise amplifier; Input one end of another circulator/isolator B links to each other with 50 Ohmages, export also transmitting of an end for the output of power amplifier, the end that is coupled links to each other with the input offset end of low noise amplifier, and output compensating signal (only containing leakage signal) is to low noise amplifier input offset end.
Pcb board cabling between described antenna, circulator/isolator, power amplifier, the low noise amplifier is meant the cabling that connects above-mentioned each module on the PCB version; It is characterized in that: the cabling of power amplifier output terminal to two a circulator/isolator output terminal makes the signal delay identical (signal phase shift is identical) on these two paths, and two circulator/isolator coupled end make signal delay identical (signal phase shift is identical) on these two paths to the cabling of the input end of low noise amplifier and input offset end respectively.
Described reception link is as follows:
Described low noise amplifier is imported the coupled end that an end connects circulator/isolator A, received RF RF signal (containing leakage signal and useful signal); The input offset end connects the coupled end of circulator/isolator B, receives compensating signal (equating with leakage signal equal and opposite in direction, amplitude); The radio frequency rf signal that only contains useful signal (leakage signal is subtracted each other by low noise amplifier and compensating signal) that output terminal output has been amplified is to input one end of I/Q two-way frequency mixer.
Described I/Q two-way frequency mixer, importing an end is the output radio frequency rf signal of low noise amplifier, and the input other end is the local oscillation signal of phaselocked loop output, and output terminal is for the simulating signal through down coversion, to analog baseband circuitry.
Described I/Q two-way analog baseband circuitry, input end is the simulating signal of Mixer output terminal, and through filtering and processing and amplifying, output terminal is an analog output signal, and ADC is to be converted to analog to digital converter.
Described analog to digital converter ADC, input end are analog output signal to be converted, the output digital signal.
Described digital signal processing circuit receives the digital signal that analog to digital converter ADC exports, and handles; And adopt OOK or ASK modulation system that modulated digital signal is exported to digital to analog converter DAC.
Described transmitting chain is as follows:
Described DAC digital to analog converter, input end are the modulated digital signal of digital signal processing circuit output, and conversion position simulating signal exports analog baseband circuitry to by output terminal.
The analog baseband circuitry of described transmitting chain, input end are the simulating signal of DAC output, and through amplifying and filtering, output terminal output simulating signal is to frequency mixer Mixer.
The frequency mixer Mixer of described transmitting chain, importing an end is the simulating signal for the treatment of up-conversion, the input other end is the local oscillation signal of phaselocked loop output, and output terminal is the radio frequency rf signal through up-conversion, divide equally for two-way to circulator/isolator A and B output terminal separately.
According to described summary of the invention and said invention structure thereof, by the system structure design chip circuit of super high frequency radio frequency electronic label reader (UHF RFID Reader) shown in Figure 3.
With reference to figure 5, wherein the pcb board cabling will make corresponding signal delay unanimity between circulator/isolator A, circulator/isolator B, low noise amplifier, the power amplifier, concrete mode is: (1) power amplifier output terminal is divided into two-way, one road output terminal to circulator/isolator A, another road is to the output terminal of circulator/isolator B, make the pcb board cabling symmetry as much as possible of this two-way, and use identical trace width, spacing (spacing that pcb board upward wiring and ground connection are spread the copper layer) the identical length of passing by; (2) input end of circulator/isolator A is connected with antenna, the input end of circulator/isolator B be connected with 50 Ohmages (making this port have the impedance operator identical with antenna); (3) coupled end of circulator/isolator A connects the input end of low noise amplifier, the coupled end of circulator/isolator B connects the input offset end of low noise amplifier, the pcb board cabling of this two-way is symmetry as much as possible, and uses identical trace width, spacing (spacing that pcb board upward wiring and ground connection are spread the copper layer) the identical length of passing by; (4) low noise amplifier is designed to have input end and input offset end, makes the signal at these two ends do and subtracts each other, and the signal after will subtracting each other then amplifies.
Provide in the foregoing description and adopted circulator/isolator to realize the leakage compensation method of super high frequency radio frequency electronic label reader, corresponding with it, can adopt coupling mechanism to realize above-mentioned leakage compensation method.
More than described the leakage compensation method of super high frequency radio frequency electronic label reader provided by the present invention and realized the radio-frequency front-end of the super high frequency radio frequency electronic label reader of this method by specific embodiment, those skilled in the art is to be understood that, in the scope that does not break away from essence of the present invention, can make certain deformation or modification to the present invention; This method also is not limited to disclosed content among the embodiment.
Claims (8)
1, a kind of leakage compensation method of super high frequency radio frequency electronic label reader, its step comprises:
1) radio-frequency front-end of super high frequency radio frequency electronic label reader is provided with two circulator/isolators or coupling mechanism, and the input end of circulator/isolator A or coupling mechanism A is connected with antenna, and the input end of circulator/isolator B or coupling mechanism B is connected with 50 Ohmages;
2) the power amplifier output terminal with the super high frequency radio frequency electronic label reader is divided into two-way, one the road to circulator/isolator A or the output terminal of coupling mechanism A, another road is to the output terminal of circulator/isolator B or coupling mechanism B, the signal delay unanimity of the pcb board cabling of above-mentioned two-way;
3) coupled end of circulator/isolator A or coupling mechanism A connects the input end of low noise amplifier, and the coupled end of circulator/isolator B or coupling mechanism B connects the input offset end of low noise amplifier;
4) low noise amplifier is done the signal of the signal of input end and input offset end and is subtracted each other, and gets rid of the leakage signal of transmitting terminal.
2, a kind of radio-frequency front-end of super high frequency radio frequency electronic label reader is characterized in that, comprises antenna, two circulator/isolators, power amplifier, low noise amplifier and the pcb board cablings between them,
Described antenna, an end are from space received RF RF signal and to the spatial emission radio frequency rf signal, and the other end links to each other with circulator/isolator A;
The output terminal of described circulator/isolator A is the transmitting of output of power amplifier, the coupled end output radio frequency rf signal that links to each other with the input end of low noise amplifier;
The input end of described circulator/isolator B links to each other with 50 Ohmages, and output terminal also is the transmitting of the output of power amplifier, and coupled end links to each other with the input offset end of low noise amplifier, exports compensating signal;
The coupled end of described circulator/isolator A is identical to the pcb board cabling signal delay of the coupled end of the pcb board cabling of low noise amplifier input end and described circulator/isolator B and low noise amplifier input offset end;
Described low noise amplifier, input end connects the coupled end of circulator/isolator A, received RF RF signal; The input offset end connects the coupled end of circulator/isolator B, receives the compensating signal that equates with leakage signal equal and opposite in direction, amplitude; The radio frequency rf signal of getting rid of leakage signal that the output terminal of described low noise amplifier output has been amplified.
3, the radio-frequency front-end of super high frequency radio frequency electronic label reader as claimed in claim 2 is characterized in that, the pcb board cabling of described power amplifier output terminal to two a circulator/isolator output terminal is symmetrical.
4, a kind of radio-frequency front-end of super high frequency radio frequency electronic label reader is characterized in that, comprises antenna, two coupling mechanisms, power amplifier, low noise amplifier and the pcb board cablings between them,
Described antenna, an end are from space received RF RF signal and to the spatial emission radio frequency rf signal, and the other end links to each other with coupling mechanism A;
The output terminal of described coupling mechanism A is the transmitting of output of power amplifier, the coupled end output radio frequency rf signal that links to each other with the input end of low noise amplifier;
The input end of described coupling mechanism B links to each other with 50 Ohmages, and output terminal also is the transmitting of the output of power amplifier, and coupled end links to each other with the input offset end of low noise amplifier, exports compensating signal;
The coupled end of described coupling mechanism A is identical to the pcb board cabling signal delay of the coupled end of the pcb board cabling of low noise amplifier input end and described coupling mechanism B and low noise amplifier input offset end;
Described low noise amplifier, input end connects the coupled end of coupling mechanism A, received RF RF signal; The input offset end connects the coupled end of coupling mechanism B, receives the compensating signal that equates with leakage signal equal and opposite in direction, amplitude; The radio frequency rf signal of getting rid of leakage signal that the output terminal of described low noise amplifier output has been amplified.
5, a kind of super high frequency radio frequency electronic label reader, comprise radio-frequency front-end, receive link, transmitting chain, digital signal processing circuit and some other auxiliary circuit module, it is characterized in that radio-frequency front-end comprises antenna, two circulator/isolators, power amplifier, low noise amplifier and the pcb board cablings between them
One end of described antenna is from space received RF RF signal and to the spatial emission radio frequency rf signal, and the other end links to each other with circulator/isolator A;
The output terminal of described circulator/isolator A is the transmitting of output of power amplifier, the coupled end output radio frequency rf signal that links to each other with the input end of low noise amplifier;
The input end of described circulator/isolator B links to each other with 50 Ohmages, and output terminal also is the transmitting of the output of power amplifier, and coupled end links to each other with the input offset end of low noise amplifier, exports compensating signal;
The cabling signal delay of the power amplifier output terminal to two of a described transmission link circulator/isolator output terminal is identical;
The low noise amplifier of described reception link is imported the coupling end that an end connects circulator/isolator A, received RF RF signal; The input offset end connects the coupled end of circulator/isolator B, receives the compensating signal that equates with leakage signal equal and opposite in direction, amplitude; The radio frequency rf signal of getting rid of leakage signal that its output terminal output has been amplified.
6, a kind of super high frequency radio frequency electronic label reader, comprise radio-frequency front-end, receive link, transmitting chain, digital signal processing circuit and some other auxiliary circuit module, it is characterized in that radio-frequency front-end comprises antenna, two coupling mechanisms, power amplifier, low noise amplifier and the pcb board cablings between them
Described antenna, an end are from space received RF RF signal and to the spatial emission radio frequency rf signal, and the other end links to each other with coupling mechanism A;
The output terminal of described coupling mechanism A is the transmitting of output of power amplifier, the coupled end output radio frequency rf signal that links to each other with the input end of low noise amplifier;
The input end of described coupling mechanism B links to each other with 50 Ohmages, and output terminal also is the transmitting of the output of power amplifier, and coupled end links to each other with the input offset end of low noise amplifier, exports compensating signal;
The coupled end of described coupling mechanism A is identical to the pcb board cabling signal delay of the coupled end of the pcb board cabling of low noise amplifier input end and described coupling mechanism B and low noise amplifier input offset end;
Described low noise amplifier, input end connects the coupled end of coupling mechanism A, received RF RF signal; The input offset end connects the coupled end of coupling mechanism B, receives the compensating signal that equates with leakage signal equal and opposite in direction, amplitude; The radio frequency rf signal of getting rid of leakage signal that the output terminal of described low noise amplifier output has been amplified.
7, as claim 5 or 6 described super high frequency radio frequency electronic label readers, it is characterized in that described reception link further comprises: the frequency mixer Mixer of I/Q two-way, the analog baseband circuitry of I/Q two-way and ADC analog to digital converter.
8, as claim 5 or 6 described super high frequency radio frequency electronic label readers, it is characterized in that described transmitting chain further comprises: DAC digital to analog converter, analog baseband circuitry and frequency mixer Mixer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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