CN100552706C - A kind of non-contact passive radio frequency label and reading system thereof - Google Patents
A kind of non-contact passive radio frequency label and reading system thereof Download PDFInfo
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- CN100552706C CN100552706C CNB2006100790320A CN200610079032A CN100552706C CN 100552706 C CN100552706 C CN 100552706C CN B2006100790320 A CNB2006100790320 A CN B2006100790320A CN 200610079032 A CN200610079032 A CN 200610079032A CN 100552706 C CN100552706 C CN 100552706C
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Abstract
The present invention relates to a kind of non-contact passive radio frequency label and reading system thereof, radio-frequency (RF) tag comprises rf wave signal source, antenna-matching circuit and radio-frequency antenna, it is characterized in that, described radio-frequency signal source adopts bulk acoustic wave multimode resonance structure, comprises the bulk acoustic wave resonant cavity, acoustics coupling layer, hearth electrode, piezoelectric membrane, insulation course and the top electrode that distribute successively from the bottom to top; Described reading system comprises reader and reader antenna, and described reader is a kind of radar transmit-receive equipment that transmits and receives of responsible radio-frequency (RF) tag request signal.Advantage of the present invention is, can directly reply the request signal of reader, can be operated in the working range of 300MHz～10GHz, and be easy to integrated.
Description
Technical field
The invention belongs to the radio RF recognition technology field, specifically, the present invention relates to a kind of non-contact passive radio frequency label and reading system thereof.
Background technology
Radio RF recognition technology (RFID, Radio Frequency Identification) is a kind of non-contacting automatic identification technology, its ultimate principle is to utilize radiofrequency signal and space coupling (electromagnetic coupled or electromagnetic propagation) transport property, realizes being identified the automatic identification of object.
Electromagnetic propagation or electromagnetic backscatter coupling, promptly so-called Principles of Radar model, the electromagnetic wave of launching is run into the target back reflection, carries back target information simultaneously, is based on electromagnetic spatial transmission rule.The electromagnetic backscatter coupling scheme generally are suitable for the long-range radio-frequency recognition system of high frequency, microwave work.Typical working frequency range comprises: 430～460MHz, 865～928MHz, 2.35～2.45GHz, 5.4～6.8GHz.The operating distance of identification is 0.1～1 meter, and the typical effect distance is 3～10 meters.
Radio frequency identification systems generally is made up of two parts, promptly electronic tag (transponder, Tag) and reader (also being read head, i.e. Reader).In the practical application of RFID, electronic tag is attached to (surface or inner) on the object that is identified, but when have electronic tag be identified the identified region of article by reader the time, reader takes out the agreement identifying information in the electronic tag in contactless mode automatically, thereby realizes automatic identify objects or the function of collecting the article identifying information automatically.
Present existing radio-frequency (RF) tag (RFID) generally is made up of with relevant antenna the integrated circuit (IC) chip.Reader antenna transmitted radio signal is given label, and radio-frequency (RF) tag (RFID) receives this signal by the dedicated antenna of oneself, and the energy (the RFID label that has is equipped with power supply) that utilizes him to obtain from signal starts the integrated circuit (IC) chip work on the label.Reader also is made up of antenna, signal transmitting and receiving receiver and code translator.After in case the chip on the RFID label is activated and starts, needing just to carry out read, write operation, reader can be sent to host computer processes to the data in the label chip that obtains by antenna through decoding.
The passive RF label that this employing is made of the integrated circuit (IC) chip in when work, at first will obtain enough energy from reader, and when the energy of receiving reached certain thresholding, the IC in the label just started working.Therefore, recognition time is long, is subjected to certain restriction on range of application.(as be operated in 430～460MHz when being operated in the upper frequency section, 865～928MHz, 2.35～2.45GHz, 5.4～6.8GHz frequency range), because inside does not have radio-frequency oscillator, like this, the frequency stability of the radiofrequency signal carrier wave of reflected back reader is poor, quick and precisely discerns for reader and brings certain difficulty.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, adopt bulk acoustic wave multimode resonator itself as radio frequency or microwave signal source, thereby providing a kind of can directly reply the request signal of reader, the working range of 300MHz～10GHz be can be operated in, and integrated non-contact passive radio frequency label and reading system thereof are easy to.
For achieving the above object, non-contact passive radio frequency label provided by the invention, comprise rf wave signal source and radio-frequency antenna 301, it is characterized in that, described radio-frequency signal source adopts bulk acoustic wave multimode resonance structure, comprises the bulk acoustic wave resonant cavity 310, hearth electrode 330, piezoelectric membrane 340 and the top electrode 360 that distribute successively from the bottom to top; Described bulk acoustic wave resonant cavity 310 is that a kind of bulk acoustic wave is propagated solid dielectric, and its solid dielectric material adopts sapphire single-crystal, yttrium aluminum garnet or fused quartz; Described hearth electrode 330 and top electrode 360 are metal electrode, and described hearth electrode 330 is connected with described radio-frequency antenna 301 with top electrode 360.
In the technique scheme, described radio-frequency signal source also comprises the acoustics coupling layer 320 between bulk acoustic wave resonant cavity 310 and hearth electrode 330; Described acoustics coupling layer 320 is one or more layers sound bearing mediums that are used for the acoustic impedance coupling; The acoustic impedance of described acoustics coupling layer 320 is near the square root of described piezoelectric membrane 340 acoustic impedances and described bulk acoustic wave resonant cavity 310 acoustic impedance products.
In the technique scheme, described radio-frequency signal source also comprises the insulation course 350 between piezoelectric membrane 340 and top electrode 360.
In the technique scheme, described piezoelectric membrane 340 is piezoelectric membranes that magnetically controlled sputter method generates, or the piezoelectric monocrystal film made of chemical micro-processing method, or the piezoelectric membrane of making of sol method.
In the technique scheme, comprise that also one realizes the antenna-matching circuit 302 of impedance matching between radio-frequency antenna 301 and radio-frequency signal source; Described antenna-matching circuit 302 1 ports are connected with top electrode 360 with described hearth electrode 330, and the another port is connected with described radio-frequency antenna 301.
In the technique scheme, described radio-frequency antenna 301 adopts whip antenna or complex media antenna, perhaps adopts the microstrip antenna that integrates with described radio-frequency signal source, the wire antenna that perhaps adopts electrically conductive ink to make.
For achieving the above object, non-contact passive radio frequency label reading system provided by the invention, comprise reader 400 and reader antenna 401, described reader 400 is a kind of radar transmit-receive equipment that transmits and receives of responsible radio-frequency (RF) tag request signal, it is characterized in that described reader 400 comprises voice alerting unit, request signal generator, external interface control module, radio-frequency receiving-transmitting switch, display unit, input decoding circuit and the embedded computer unit of controlling above-mentioned each unit; Also comprise the power amplifier that is connected between request signal generator and the radio-frequency receiving-transmitting switch, and be connected the low noise amplifier between radio-frequency receiving-transmitting switch and the input decoding circuit; Described radio-frequency receiving-transmitting switch is connected with reader antenna 401.
In the technique scheme, this reading system adopts a kind of of following four kinds of signals or makes up as request signal:
1) comprises the short pulse signal of bulk acoustic wave multimode resonance structure bandwidth of operation high-frequency signal spectrum component in the corresponding non-contact passive radio frequency label;
2) comprise the pulse signal that certain width is arranged of the single high-frequency signal modulation of bulk acoustic wave multimode resonance structure resonant frequency point in the corresponding non-contact passive radio frequency label or disresonance point;
3) comprise the pulse signal that certain width is arranged of the swept-frequency signal modulation of bulk acoustic wave multimode resonance structure bandwidth of operation in the corresponding non-contact passive radio frequency label;
4) comprise the signal of the single high-frequency coding modulation of bulk acoustic wave multimode resonance structure resonant frequency point in the corresponding non-contact passive radio frequency label or disresonance point.
Advantage of the present invention is, because the bulk acoustic wave multimode resonator itself is exactly radio frequency (or microwave) resonator, it can be used as radio frequency or microwave signal source, and the radiofrequency signal that it can directly receive label antenna converts bulk acoustic wave to, thereby can directly reply the request signal of reader.This radio-frequency (RF) tag can be operated in the working range of 300MHz～10GHz, and therefore, label and antenna can be made very for a short time, and are easy to integrated.On using, it can be used as independently radio-frequency (RF) tag, is widely used in article identification or Security Officer identification.Also can work together with the radio frequency identification systems of existing band integrated circuit (IC) chip, form the radio-frequency (RF) tag of a two-frequency operation, function complements each other.The present invention is particularly suitable for being operated in ultrahigh frequency and above frequency range (as 430～460MHz, 865～928MHz, 2.35～2.45GHz, 5.4～6.8GHz frequency range).
Description of drawings
The schematic diagram of radio-frequency (RF) tag that Fig. 1 is made of the bulk acoustic wave multimode resonator (RFID) and system
The radio-frequency (RF) tag that Fig. 2 is made of bulk acoustic wave multimode resonator, antenna-matching circuit and antenna (RFID)
The schematic diagram of Fig. 3 radio-frequency (RF) tag (RFID) reader system
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Embodiment:
Fig. 1 shows two parts of the present invention, i.e. the schematic diagram of radio-frequency (RF) tag (RFID) and corresponding radio-frequency (RF) tag (RFID) reader system.
Described radio-frequency (RF) tag (RFID) is made up of bulk acoustic wave multimode resonator 300, antenna-matching circuit 302 and radio-frequency antenna 301.Described bulk acoustic wave multimode resonator 103 mainly comprises bulk acoustic wave resonator cavity and piezoelectric thin film transducer.The thickness of described bulk acoustic wave resonator cavity determines the interval of 103 two adjacent resonance frequencies of described bulk acoustic wave multimode resonator or in time domain, the time interval of two adjacent reflected impulses; The thickness of piezoelectric membrane determines the centre frequency of described bulk acoustic wave multimode resonator 103 work in the described piezoelectric thin film transducer.Among the present invention, the centre frequency of described bulk acoustic wave multimode resonator 103 work can be at 300MHz～10GHz, and the thickness of described bulk acoustic wave resonator cavity can be 20 microns～20 millimeters scope.Centre frequency by regulating described bulk acoustic wave multimode resonator 103 with and the thickness of resonator cavity produce different radio-frequency (RF) tag.
Further, as shown in Figure 2, the bulk acoustic wave multimode resonator 300 described in the present embodiment comprises bulk acoustic wave resonant cavity 310, acoustics coupling layer 320, hearth electrode 330, piezoelectric membrane 340, insulation course 350 and top electrode 360 compositions.Described antenna-matching circuit 302 1 ports are connected with top electrode 360 with described hearth electrode 330, and the another port is connected with described radio-frequency antenna 301.
Bulk acoustic wave resonant cavity 310 in the described bulk acoustic wave multimode resonator 300 is positioned at orlop, it is generally as substrate, growth or deposit acoustics coupling layer 320, vacuum evaporation or sputter and make hearth electrode 330, direct current or rf magnetron sputtering piezoelectric membrane 340, radio-frequency sputtering or deposition insulating layer 350 by lithography and vacuum evaporation or sputter and make top electrode 360 by lithography successively on it.In general, described bulk acoustic wave multimode resonator 300 can cut into arbitrary shape, as long as cutting does not have influence on the performance of device.Preferably be cut into rectangular parallelepiped or square.Have only described hearth electrode 330 and top electrode 360 to carry out etching, other layer does not generally carry out etching.The shape of described hearth electrode 330 and top electrode 360 is generally circle, also can be square or polygon.Generally speaking, described top electrode 360 is smaller than described hearth electrode 330.
Described radio-frequency (RF) tag (RFID) reader system is made up of reader 400 and reader antenna 401.As shown in Figure 3, described reader 400 comprises voice alerting unit 410, request signal generator 420, power amplifier 430, external interface control module 440, embedded computer unit 450, radio-frequency receiving-transmitting switch 460, display unit 470, input and decoding circuit 480 and low noise amplifier 490 compositions.Described radio-frequency receiving-transmitting switch 460 is connected with described reader antenna 401.
Described embedded computer unit 450 is cardiac components of described reader 400, and it is connected with each pith of described reader 400, is that total system is controlled to realize.Described embedded computer unit 450 is connected with described request signal generator 420, make it produce needed inquiry pulse signal, the output of this request signal generator 420 connects the input of described power amplifier 430, and the output of this power amplifier 430 is connected with the transmitting terminal of described radio-frequency receiving-transmitting switch 460.Described embedded computer unit 450 is connected with described radio-frequency receiving-transmitting switch 460, is to be used for emission or to be used for reception to control described reader antenna 401, and the common port of this radio-frequency receiving-transmitting switch 460 is connected with described reader antenna 401.Described embedded computer unit 450 is connected with decoding circuit 480 with described input, by the communication between them, obtain the identifying information of radio-frequency (RF) tag, output with described low noise amplifier 490 is connected this input with decoding circuit 480, and the input end of this low noise amplifier 490 is connected with the receiving end of described radio-frequency receiving-transmitting switch 460.Described embedded computer unit 450 is connected with voice alerting unit 410 with described display unit 470, by display unit 410 and voice alerting unit 410 outputs, provides the information of the vision and the sense of hearing with the result of radio-frequency (RF) identification.Described embedded computer unit 450 is got in touch by described external interface control module 440 foundation and distant place equipment, also the result of radio-frequency (RF) identification can be exported to simultaneously the equipment in a distant place.
The course of work of radio-frequency (RF) tag (RFID) and reading system thereof is such: after reader system powers up, the firmware monitor of embedded computer unit 450 operations of reader system 400 oneself is to carry out system initialization, send instruction to request signal generator 420 then, make it send the inquiry pulse signal, after this pulse signal amplified through power amplifier 430, the radio-frequency receiving-transmitting switch 460 by being in the emission attitude and reader antenna 401 radiate with form of electromagnetic wave again.When radio-frequency (RF) tag is in the query context of described reader system 400, it just receives pulse signal as pumping signal with radio-frequency antenna 301, this pumping signal produces voltage by antenna-matching circuit 302 between the top electrode 360 of described bulk acoustic wave multimode resonator 300 and metallic bottom electrode 330, like this, go out bulk acoustic wave by piezoelectric membrane 340 at described resonator cavity 310 underexcitations, this bulk acoustic wave is propagated in resonator cavity 310, and come back reflective at the two ends of resonator cavity, but bulk acoustic wave is each during through described piezoelectric membrane 340, pass through piezoelectric effect, produce an electric signal on the top electrode 360 of piezoelectric membrane 340 and hearth electrode 330, this electric signal is launched through described antenna-matching circuit 302 and described radio-frequency antenna 301 again.And described reader 400 is after emission inquiry pulse, and radio-frequency receiving-transmitting switch 460 just enters accepting state, begins to receive the answer signal from radio-frequency (RF) tag.The answer signal of radio-frequency (RF) tag passes to described embedded computer unit 450 through reader antenna 401, low noise amplifier 490 and input and decoding circuit 480.If in the given time, the answer signal that is contemplated to can be received in embedded computer unit 450, then confirm the existence of radio-frequency (RF) tag, and by display unit 470 demonstration recognition results, produce corresponding voice suggestion by voice alerting unit 410 simultaneously, also can pass to the equipment in a distant place by the result that the external interface control module will be discerned, pass to the monitoring equipment in a distant place as the result that will discern by public telephone network or the Internet etc.If in the given time, the answer signal that is contemplated to can be received in embedded computer unit 450, then shows the existence of not finding described radio-frequency (RF) tag, and corresponding processing will be made in embedded computer unit 450.
Further, in the present embodiment, the antenna system that the antenna that described radio-frequency antenna 301 is a kind of broad sense or a plurality of antenna element are formed, its function are the electromagnetic waves that receives effectively with radiation certain frequency scope.Also can be common whip antenna, complex media antenna; Also can be and the integrated together microstrip antenna of described bulk acoustic wave multimode resonator 300; It also can be the wire antenna of making by electrically conductive ink.
Described antenna-matching circuit 302 is impedance inverter circuits of a kind of broad sense, and its function is that described bulk acoustic wave multimode resonator 300 and described radio-frequency antenna 301 are realized impedance matching, so that more effectively receive and radiated electromagnetic wave.Generally, can finish with some inductance and electric capacity, also can be integrated with on a slice substrate or be integrated on the described bulk acoustic wave resonant cavity 310 with described bulk acoustic wave multimode resonator 300, described radio-frequency antenna 301.When piezoelectric transducer in working frequency range impedance and antenna impedance relatively near the time, or the performance effects that 302 pairs of described antenna-matching circuits improve label are hour, described antenna-matching circuit 302 can omit.
The bulk acoustic wave that described bulk acoustic wave resonant cavity 310 is a kind of broad sense is propagated solid dielectric.Its effect is to allow bulk acoustic wave conduct acoustic waves and decay as far as possible little therein.Since sound wave therein come back reflective, therefore, the depth of parallelism that requires to be used for two faces of acoustic reflection is tried one's best.Described bulk acoustic wave resonant cavity 310 materials commonly used have sapphire single-crystal (Al2O3), yttrium aluminum garnet (YAG), fused quartz etc.The frequency interval of thickness decision bulk acoustic wave multimode resonator 300 adjacent two Frequency points of described bulk acoustic wave resonant cavity 310.For short pulse signal, the interval of the thickness of described bulk acoustic wave resonant cavity 310 decision reflected impulse.By way of example, be the resonator cavity of material for fused quartz (longitudinal wave velocity is 6000 meter per seconds), if thickness is 0.3 millimeter, the time interval of then adjacent two reflected impulses be 100 nanosecond (account form, the time interval=2*0.3*10e-3/6000=100 nanosecond), be spaced apart 10MHz and face two resonance frequency mutually.(annotate: two indexs of centre frequency and the uniqueness that to face two these two parameters of resonance frequencies interval mutually are indication labels of the present invention.That is to say different labels, just these two parameters of conversion.)
Described acoustic coupling layer 320 is one or more layers sound bearing mediums.Its effect is that the sound wave that described piezoelectric membrane 340 produces as often as possible is coupled in the described resonator cavity 310, plays the effect of acoustic impedance coupling.Generally speaking, the material of described acoustic coupling layer 320 and thickness are by the decision of the material of described piezoelectric membrane 340 and bulk acoustic wave resonant cavity 310.The wavelength of bulk acoustic wave when the thickness of described acoustic coupling layer 320 is generally 1/4th centre frequencies, the general square root of its acoustic impedance near described piezoelectric membrane 340 acoustic impedances and described resonator cavity 310 acoustic impedance products./ 4th impedance matching boxs as common usefulness in the microwave communication.Under the more approaching situation of described piezoelectric membrane 340 acoustic impedances and described resonator cavity 310 acoustic impedances, described acoustic coupling layer 320 also can omit.
Described hearth electrode 330 can be a kind of metal electrode (as an aluminium, gold etc.), can be aluminium/titanium (Al/Ti) composite bed metal electrode, also can be golden chromium composite bed (Au/Cr) electrode.Described hearth electrode 330 is drawn lead and is connected with described antenna-matching circuit 302.
Described piezoelectric membrane 340 can be the piezoelectric membrane (as ZnO, AlN) that magnetically controlled sputter method generates, and the piezoelectric monocrystal film that also can be chemical micro-processing method (CMP) making is (as LiNbO
3, LiTaO
3), also can be the piezoelectric membrane of making of sol method (Sol-gel) (as the PZT piezoelectric membrane of Sol-gel method making).The frequency of operation of the thickness decision bulk acoustic wave multimode resonator 300 of described piezoelectric membrane 340.With regard to present process conditions, the piezoelectric membrane of making can be operated in the working range of 300MHz～10GHz.Under the present process conditions, the thickness of the piezoelectric membrane that can make is generally in 0.5 micron～10 micron dimensions.
Described insulation course 350 can be the silicon dioxide (SiO2) that generates with magnetically controlled sputter method, also can be the insulation course (as LTO) made of method for distinguishing etc., the effect of described insulation course 350 be direct-current short circuit or punctures of avoiding little defective on the described piezoelectric membrane 340 or pin hole to cause.Under the thicker situation of the thickness of described piezoelectric membrane 340, for example thickness is greater than more than 2 microns the time, and described insulation course 350 also can omit.
Described top electrode 360 can be a kind of metal electrode (as an aluminium, gold etc.), can be aluminium/titanium (Al/Ti) composite bed metal electrode, also can be golden chromium composite bed (Au/Cr) electrode, also can be the electrode of being made by electrically conductive ink.Described top electrode 360 is drawn lead and is connected with described antenna-matching circuit 302.
Further, in the present embodiment, the antenna system that the antenna that described reader antenna 401 is a kind of broad sense or a plurality of antenna element are formed, its function are the electromagnetic waves that receives effectively with radiation certain frequency scope.Also can be common whip antenna, complex media antenna; The also highly directive antenna array of the high-gain that can form by a plurality of antennas.Described reader antenna 401 is connected with described radio-frequency receiving-transmitting switch 460 output terminals.
The voice generating means that described voice alerting unit 410 is a kind of broad sense, its function are that the recognition result to described reader 400 provides voice suggestion.It can be a simple hummer; Also can be Yang Shengqi (or loudspeaker); It also can be complicated speech synthesis apparatus etc.Described voice alerting unit 410 is connected with described embedded computer unit 450, is equivalent to its external equipment units.
The radar signal generation unit that described request signal generator 420 is a kind of broad sense.Its function is to produce described reader 400 needed request signals.Described request signal generator 420 is controlled by described embedded computer unit 450, and its output is connected with the input end of described power amplifier 430.According to the characteristics of bulk acoustic wave multimode resonator, a kind of or combination of following four kinds of signals is better as the request signal effect:
A) comprise the short pulse signal (as the δ pulse signal) of described bulk acoustic wave multimode resonator 300 bandwidth of operation high-frequency signal spectrum components;
B) comprise the pulse signal that certain width is arranged of the single high-frequency signal modulation of described bulk acoustic wave multimode resonator 300 resonant frequency points (or disresonance point);
C) comprise the pulse signal that certain width is arranged of the swept-frequency signal modulation of described bulk acoustic wave multimode resonator 300 bandwidth of operation;
D) comprise the signal of the high-frequency coding modulation of described bulk acoustic wave multimode resonator 300 resonant frequency points (or disresonance point);
The broadband power amplifying unit that described power amplifier 430 is a kind of broad sense, its function is that the signal that described request signal generator 420 produces is carried out power amplification, and the signal after will amplifying is through described radio-frequency receiving-transmitting switch 460, radiate with form of electromagnetic wave by described reader antenna 401.The output of described power amplifier 430 is connected with the emission input end of described radio-frequency receiving-transmitting switch 460.
The periphery communication interface controller that described external interface control module 440 is a kind of broad sense, its function is to set up and described embedded computer unit 450 and outside communication as bridge, mainly be equipment or the surveillance that the result of identification is sent to a distant place, the interface of distant place equipment can be the adapter of the Internet, public telephone network or Wi-Fi, WiMax, GPRS wireless network.The two-way connection set up by multi-thread and described external interface control module 440 in described embedded computer unit 450, and realizes control, programming and data transmission etc.
Described embedded computer unit 450 is a kind of complete computer systems, comprises relevant hardware and system monitoring software.It is the cardiac component of described reader 400, and it is connected with each of described reader, and its function is that total system is controlled.It produces needed inquiry pulse signal by the described request signal generator 420 of control, by controlling the emission or the accepting state of the described reader antenna 401 of described radio-frequency receiving-transmitting switch 460 controls; It by with the communication of described input and decoding circuit 480, obtain the identifying information of radio-frequency (RF) tag; It respectively by described display unit 470 and voice alerting unit 410 with the result of radio-frequency (RF) identification by display device and voice device output; It is got in touch by described external interface control module 440 foundation and distant place equipment, also the result of radio-frequency (RF) identification can be exported to simultaneously the equipment in a distant place.
Single-pole double-throw (SPDT) (SPDT) the wide band radio-frequency switch that described radio-frequency receiving-transmitting switch 460 is a kind of broad sense.Its function is when transmitting and receiving state, the position of switched antenna.In when emission, described radio-frequency receiving-transmitting switch 460 connect reader antennas 401 and described power amplification its 430; When receiving, described radio-frequency receiving-transmitting switch 460 is connected reader antenna 401 and described low noise amplifier 490.The switch of described radio-frequency receiving-transmitting switch 460 switches the controlled described embedded computer unit 450 that is formed on.The emission input end of described radio-frequency receiving-transmitting switch 460 is connected with the output terminal of described power amplifier 430, it receives output terminal and is connected with the input end of described low noise amplifier, the common port of its radio-frequency (RF) switch is connected with described reader antenna 401, and its control end is connected with described embedded computer unit.
Display device or equipment that described display unit 470 is a kind of broad sense.Its function is exactly the result who provides radio-frequency recognition system by the mode of vision.Common display unit is CRT monitor, display screen, LCD Panel etc.
Described input and decoding circuit 480 are input and treatment circuits of a kind of broad sense.Its function is processing such as the signal with 490 outputs of described low noise amplifier further amplifies, shaping, demodulation, peak detection, to obtain desired identification signal.Described input and the decoding circuit 480 controlled described embedded computer unit 450 that are formed on, but its input is connected with the output of described low noise amplifier 490.
The wide band radio-frequency low noise amplifying circuit that described low noise amplifier 490 is a kind of broad sense can comprise one or more levels radio frequency amplifier, also can comprise bandpass filter.Its function is that the faint answer signal of the described radio-frequency (RF) tag 300 that receives by described reader antenna 401 carries out low noise and amplifies.The input end of described low noise amplifier 490 is connected with the radio frequency receiving end of described radio-frequency receiving-transmitting switch 460, and its output terminal connects described input and decoding circuit 480.
Claims (7)
1, a kind of non-contact passive radio frequency label, comprise radio-frequency signal source and radio-frequency antenna (301), it is characterized in that, described radio-frequency signal source adopts bulk acoustic wave multimode resonance structure, comprises the bulk acoustic wave resonant cavity (310), hearth electrode (330), piezoelectric membrane (340) and the top electrode (360) that distribute successively from the bottom to top; Described bulk acoustic wave resonant cavity (310) is that a kind of bulk acoustic wave is propagated solid dielectric, and its solid dielectric material adopts sapphire single-crystal, yttrium aluminum garnet or fused quartz; Described hearth electrode (330) and top electrode (360) are metal electrode, and described hearth electrode (330) is connected with described radio-frequency antenna (301) with top electrode (360).
2, by the described non-contact passive radio frequency label of claim 1, it is characterized in that described radio-frequency signal source also comprises the acoustics coupling layer (320) that is positioned between bulk acoustic wave resonant cavity (310) and the hearth electrode (330); Described acoustics coupling layer (320) is one or more layers sound bearing medium that is used for the acoustic impedance coupling.
3, by the described non-contact passive radio frequency label of claim 1, it is characterized in that described radio-frequency signal source also comprises the insulation course (350) that is positioned between piezoelectric membrane (340) and the top electrode (360).
4, by the described non-contact passive radio frequency label of claim 1, it is characterized in that, described piezoelectric membrane (340) is the piezoelectric membrane that magnetically controlled sputter method generates, or the piezoelectric monocrystal film made of chemical micro-processing method, or the piezoelectric membrane of making of sol method.
5, by the described non-contact passive radio frequency label of claim 1, it is characterized in that, comprise that also one realizes the antenna-matching circuit (302) of impedance matching between radio-frequency antenna (301) and radio-frequency signal source; Described hearth electrode (330) directly is not connected with described radio-frequency antenna (301) with top electrode (360), but be connected with a port of described antenna-matching circuit (302), another port of described antenna-matching circuit (302) is connected with described radio-frequency antenna (301).
6, by the described non-contact passive radio frequency label of claim 1, it is characterized in that, described radio-frequency antenna (301) adopts whip antenna or complex media antenna, perhaps adopts the microstrip antenna that integrates with described radio-frequency signal source, the wire antenna that perhaps adopts electrically conductive ink to make.
7, a kind of non-contact passive radio frequency label reading system, comprise reader (400) and reader antenna (401), described reader (400) is a kind of radar transmit-receive equipment that transmits and receives of responsible radio-frequency (RF) tag request signal, described reader (400) comprises request signal generator, external interface control module, input decoding circuit, it is characterized in that described reader (400) also comprises voice alerting unit, radio-frequency receiving-transmitting switch, display unit and the embedded computer unit of controlling above-mentioned each unit; Described reader (400) also comprises the power amplifier that is connected between request signal generator and the radio-frequency receiving-transmitting switch, and is connected the low noise amplifier between radio-frequency receiving-transmitting switch and the input decoding circuit; Described radio-frequency receiving-transmitting switch is connected with described reader antenna (401), and described reading system adopts a kind of of following four kinds of signals or makes up as request signal:
1) comprises the short pulse signal of bulk acoustic wave multimode resonance structure bandwidth of operation high-frequency signal spectrum component in the corresponding non-contact passive radio frequency label;
2) comprise the pulse signal that certain width is arranged of the single high-frequency signal modulation of bulk acoustic wave multimode resonance structure resonant frequency point in the corresponding non-contact passive radio frequency label or disresonance point;
3) comprise the pulse signal that certain width is arranged of the swept-frequency signal modulation of bulk acoustic wave multimode resonance structure bandwidth of operation in the corresponding non-contact passive radio frequency label;
4) comprise the signal of the high-frequency coding modulation of bulk acoustic wave multimode resonance structure resonant frequency point in the corresponding non-contact passive radio frequency label or disresonance point.
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| CN108598667B (en) * | 2018-05-29 | 2023-08-18 | 华南师范大学 | Compact broadband circularly polarized back cavity type RFID reader antenna |
| CN110858271A (en) * | 2018-08-26 | 2020-03-03 | 吴成彬 | Electronic passive tag identification system and method based on frequency selection characteristic |
| US11740192B2 (en) | 2019-12-13 | 2023-08-29 | Sonera Magnetics, Inc. | System and method for an acoustically driven ferromagnetic resonance sensor device |
| CA3193810A1 (en) | 2020-09-30 | 2022-04-07 | Dominic LABANOWSKI | System and method for a magnetic sensor array circuit |
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| US5446306A (en) * | 1993-12-13 | 1995-08-29 | Trw Inc. | Thin film voltage-tuned semiconductor bulk acoustic resonator (SBAR) |
| US6515558B1 (en) * | 2000-11-06 | 2003-02-04 | Nokia Mobile Phones Ltd | Thin-film bulk acoustic resonator with enhanced power handling capacity |
| CN1489830A (en) * | 2001-01-29 | 2004-04-14 | 日本电气株式会社 | Time division multiplexing address tranceiver and receiving automatic gain control |
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