CN203630795U - Radio frequency module for RFID equipment, and RFID equipment - Google Patents
Radio frequency module for RFID equipment, and RFID equipment Download PDFInfo
- Publication number
- CN203630795U CN203630795U CN201320830010.9U CN201320830010U CN203630795U CN 203630795 U CN203630795 U CN 203630795U CN 201320830010 U CN201320830010 U CN 201320830010U CN 203630795 U CN203630795 U CN 203630795U
- Authority
- CN
- China
- Prior art keywords
- radio frequency
- module
- radio
- signal
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 20
- 238000001914 filtration Methods 0.000 claims description 14
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 238000005070 sampling Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- WYROLENTHWJFLR-ACLDMZEESA-N queuine Chemical compound C1=2C(=O)NC(N)=NC=2NC=C1CN[C@H]1C=C[C@H](O)[C@@H]1O WYROLENTHWJFLR-ACLDMZEESA-N 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 238000004148 unit process Methods 0.000 description 1
Images
Abstract
The utility model relates to a radio frequency module for RFID equipment. A radio frequency transmission channel includes a plurality of radio frequency transmission sub channels. The plurality of transmission sub channels obtain baseband signals from different ports of a baseband control unit, covert the baseband signals into radio frequency signals, control the phases of the radio frequency signals by respective directional couplers, and transmit the radio frequency signals to antenna units of an antenna. The radio frequency module includes a multi-in single-out radio frequency change-cover switch which is used for obtaining and outputting the radio frequency signals received by different antenna units. Input terminals of the radio frequency change-cover switch are connected with the directional couplers of the transmission sub channels, respectively, and an output terminal of the radio frequency change-cover switch is connected with an input terminal of a radio frequency reception channel. The utility model further relates to the RFID equipment. The beneficial effects of the utility model are that the distance of a reader-writer in complex environment is increased, and tag signals can be read and identified.
Description
Technical field
The utility model relates to field of radio frequency identification, more particularly, relates to a kind of radio-frequency module for RFID equipment and RFID equipment thereof.
Background technology
Radio-frequency (RF) identification (RFID) has obtained development at full speed in the past 10 years.For example, on the packing case of all commodity of department store, all apply RFID technology, thereby reduced the error relevant to Inventory Process, reduced human cost; On highway, set up the electronic charging station of RFID, realized non-parking charge of highway etc.In recent years, the utilization field of RFID had obtained larger expansion, for example, and for the management of warship antenna, in the application in the fields such as public transport, subway, campus.Predictably, along with the development of RFID technology and the reduction of cost, RFID technology will be developed faster.Certainly yet there is many problems in RFID technology, as the reading/writing distance restriction of card reader, conflict and the read or write speed etc. of electronic tag.For RFID, at ultrahigh frequency and microwave frequency band radio-frequency recognition system (RFID) signal, due to the environment that exists noise, relevant multipath and many labels to exist, under certain situation (normally noise large, have relevant multipath and a multiple label collision), be difficult to extract and identification label signal.For this reason, can under complex environment, extract and identification label signal just becomes outbalance.
Utility model content
The technical problems to be solved in the utility model is, be restricted, be difficult to extract and the defect of identification label signal for prior art above-mentioned read write line distance under complex environment, provide a kind of and can under complex environment, improve read write line distance, can extract and the radio-frequency module for RFID equipment and the RFID equipment thereof of identification label signal.
The utility model solves the technical scheme that its technical matters adopts: construct a kind of radio-frequency module for RFID equipment, described radio-frequency module is connected between the baseband control unit and antenna of described RFID equipment, described radio-frequency module comprises radio frequency sendaisle and radio frequency reception channel, described radio frequency sendaisle and described radio frequency reception channel are connected between the different port and described antenna of described baseband control unit, and described antenna is the aerial array that comprises multiple antenna elements; Described radio frequency sendaisle comprises multiple for sending the radio frequency transmission subchannel of same frequency, out of phase radiofrequency signal, described multiple radio frequency sends subchannel and is obtained baseband signal and be converted into radiofrequency signal by the different port of described baseband control unit, and its phase place of directional coupler control by separately is also transferred to each antenna element of described antenna; Described radio-frequency module also comprise multichannel input a road output, for obtaining radiofrequency signal that different antennae unit receives the radio frequency converting switch of output, the input end of described radio frequency converting switch is connected with the directional coupler that described each radio frequency sends subchannel, and its output terminal is connected with the input end of described radio frequency reception channel.
Further, its output terminal of control signal control that described radio frequency converting switch is exported by described baseband control unit and input end are switched on or switched off order.
Further, it is corresponding one by one with described antenna element quantity that the radio frequency that described radio frequency sendaisle comprises sends subchannel quantity, and each radio frequency sends subchannel and is connected to an antenna element by a directional coupler.
Further, described radio frequency transmission subchannel comprises D/A converter module, up-converter module, homology oscillator module, low-pass filtering module and power amplifier module; The digital signal of described baseband control unit output is converted to simulating signal by described D/A converter module, and being transported to described up-converter module, described up-converter module also receives the oscillator signal of described homology oscillator module output and the signal of described D/A converter module output is modulated on described oscillator signal; Carry modulated signal to carry out filtering to described low-pass filtering module; Filtered signal is transported to power amplifier module and carries out power amplification; Power amplifier module output signal sends the directional coupler of subchannel to described radio frequency.
Further, described radio frequency reception channel comprises power amplifier, low-pass filter, low-converter and analog-to-digital conversion module; Described power amplifier obtains radiofrequency signal by the output terminal of described radio frequency converting switch, is carried out being transported to described low-pass filter after power amplification and carries out filtering; Filtered signal carries out lower demodulation by low-converter and obtains simulating signal, is converted to digital signal and is transported to described baseband control unit by described analog-to-digital conversion module.
Further, the D/A converter module that described each radio frequency sends subelement is connected with described baseband control unit by parallel bus respectively.
Further, send the parameter of the directional coupler of subchannel connection by controlling each radio frequency, make the phase place difference of the radiofrequency signal of described each antenna element transmission, and then obtain the synthetic wave beam of described antenna transmission.
Further, described radio frequency converting switch is under the effect of described baseband control unit output control signal, make respectively the input port connection of the connection of the directional coupler corresponding with each antenna element successively of its output terminal, and obtain label echo signal by described radio frequency reception channel.
Further, the quantity of described antenna element is 4, and the quantity that described radio frequency sends subchannel is 4.
The utility model also relates to a kind of RFID equipment, comprises the radio-frequency module for sending and receiving radio frequency, and described radio-frequency module is the radio-frequency module for RFID equipment described in above-mentioned any one.
Implement the radio-frequency module for RFID equipment of the present utility model and RFID equipment thereof, there is following beneficial effect: owing to having radio frequency sendaisle and radio frequency reception channel in radio-frequency module, and radio frequency sendaisle comprises multiple subchannels, these subchannels are connected on the different antennae unit of aerial array, and by the signal beam of the different radiofrequency signal synthetic antenna output of connected antenna element output phase; Meanwhile, radio frequency reception channel obtains described antenna element radiofrequency signal output, out of phase successively, obtains the echoed signal of label after processing.So it can improve read write line distance, can extract and identification label signal under complex environment.
Accompanying drawing explanation
Fig. 1 is that the utility model is for the radio-frequency module of RFID equipment and the structural representation of RFID apparatus embodiments radio-frequency module thereof;
Fig. 2 is the logic diagram of radio-frequency module in described embodiment.
Embodiment
Below in conjunction with accompanying drawing, the utility model embodiment is described further.
As shown in Figure 1, in the radio-frequency module for RFID equipment of the present utility model and RFID apparatus embodiments thereof, this radio-frequency module is connected between the baseband control unit 1 and antenna 3 of RFID equipment, this radio-frequency module comprises radio frequency sendaisle 21 and radio frequency reception channel 22, radio frequency sendaisle 21 and radio frequency reception channel 22 are connected between the different port and antenna 3 of baseband control unit 1, and antenna 3 is the aerial array that comprises multiple antenna elements; Radio frequency sendaisle 21 comprises multiple for sending the transmission subchannel (see figure 1) of same frequency, out of phase radiofrequency signal, multiple transmission subchannels are obtained baseband signal and are converted into radiofrequency signal by the different port of baseband control unit 1, by that connect separately, different its phase place of directional coupler control (making each radio frequency send the phase place difference of the radiofrequency signal of subchannel) and be transferred to each antenna element of antenna 3; Radio-frequency module also comprise multichannel input a road output, for obtaining radiofrequency signal that different antennae unit receives the radio frequency converting switch 23 of output, the input end of radio frequency converting switch 23 is connected with the directional coupler that each radio frequency sends subchannel, and its output terminal is connected with the input end of radio frequency reception channel 22.Such structure makes this radio-frequency module can pass through to control the parameter of above-mentioned directional coupler, and then the radiofrequency signal that regulates an antenna element to send, the electromagnetic wave that whole antenna 3 is sent can be adjusted to the beam shape that hope obtains, and improves the transmission range of read write line.Equally, when reception, be also like this, the electromagnetic wave sensing by channel different antennae unit, and it is processed, can, at the environment that has noise, relevant multipath and many labels, extract and identification label signal.
In the present embodiment, its output terminal of control signal control that radio frequency converting switch 23 is exported by baseband control unit 1 and input end are switched on or switched off order.That is to say, this radio frequency converting switch 23 has the control end of input control signal, and this port is connected (referring to Fig. 1) with baseband control unit 1.In addition, in the present embodiment, it is corresponding one by one with antenna element quantity that (or having) radio frequency that radio frequency sendaisle 21 comprises sends subchannel quantity, and each radio frequency transmission subchannel is connected to antenna element by a directional coupler (different radio frequency transmission subchannels are by different directional couplers); (normally baseband control unit 1) sends the parameter of the directional coupler of subchannel connection by controlling each radio frequency, make the phase place difference of the radiofrequency signal of each antenna element transmission, and then obtains the synthetic wave beam of whole antenna transmission.
Receive label send signal time, radio frequency converting switch 23 is exported in baseband control unit 1 under the effect of control signal, make respectively its output terminal successively the input port of the connection of the directional coupler corresponding with each antenna element connect (obtain successively the induction of each antenna element and radiofrequency signal), and by radio frequency reception channel 22, through processing computing, obtain label echo signal.
Refer to Fig. 2, Fig. 2 shows a kind of situation in the present embodiment, in Fig. 2, above-mentioned antenna element and radio frequency send subchannel and are 4 (referring to 4 signalling channels of top, Fig. 2 middle part), it is corresponding one by one that antenna element and radio frequency send subchannel, and a radio frequency transmission subchannel is connected on an antenna element by a directional coupler.In Fig. 2, each radio frequency sends subchannel and comprises D/A converter module (DAC), up-converter module, homology oscillator module (LO), low-pass filtering module (LPC) and power amplifier module (power amplifier); The digital signal that D/A converter module is exported baseband control unit 1 is converted to simulating signal, and being transported to up-converter module, up-converter module also receives the oscillator signal of homology oscillator module output and the signal of D/A converter module output is modulated on oscillator signal; Carry modulated signal to carry out filtering to low-pass filtering module; Filtered signal is transported to power amplifier module and carries out power amplification; Power amplifier module output signal sends the directional coupler of subchannel to radio frequency.In the present embodiment, above-mentioned each radio frequency send the D/A converter module of subelement to be connected with baseband control unit 1 by parallel bus respectively.
Radio frequency reception channel 22 comprises power amplifier, low-pass filter, low-converter and analog-to-digital conversion module; Power amplifier obtains radiofrequency signal by the output terminal of radio frequency converting switch 23, is carried out being transported to low-pass filter after power amplification and carries out filtering; Filtered signal carries out lower demodulation by low-converter and obtains simulating signal, is converted to digital signal and is transported to baseband control unit process by analog-to-digital conversion module.
In a word, in Fig. 2, be made up of the 1x4 antenna array being linked in sequence, these two parts of radio-frequency module, 1x4 antenna array is used for to target emanation and receives frequency electromagnetic waves, mixing, demodulation and the amplification of radio-frequency module settling signal, baseband signal encoding and decoding.1x4 antenna array is launching beam simultaneously, and then the synthetic wave beam with narrower main lobe width; Radio-frequency module Yu 1x4 road antenna array is received and sent messages simultaneously, and carry out the phase control of 4 road signals and then complete the phase place of No. 4 antenna arrays synthetic, and complete the processing of label information and carry out completion system task with the communication whole system of host computer by the transmission of protocol processes and information.
For the radio frequency sendaisle of radio-frequency module, it comprises 4 way analog conversion circuit (DAC) circuit, DAC circuit adopts parallel bus pattern, quantified precision is 12bit, switching rate is 125Mbps, every road DAC completes independently I of 2 tunnels, Q modulation, the up-converter module that its rear end connects and the homology pierce circuit being connected with up-converter module are modulated the digital signal of DAC circuit output, amplify by entering power amplifier module after low-pass filtering module (LFP) filtering afterwards, carry out phase control by directional coupler Dui Si road signal, the fixed skew of synthetic modulation signal, and then control antenna launching beam forms synthetic wave beam.
For the radio frequency reception channel of radio-frequency module, it adopts analog to digital converter (ADC) the chip MAX19712 of 12bit precision, completes by coupled switching the 4 road echo label signal processing that 1x4 antenna array receives.Select Yi road radiofrequency signal first after front end power amplifier and low-pass filter are simulated pre-service, to send into lower frequency changer circuit through change-over switch and carry out demodulation, be transformed to the Wideband Intermediate Frequency signal that is suitable for A/D sampling, this Wideband Intermediate Frequency signal in analog to digital converter (ADC) to wideband digital intermediate frequency in a certain interested signal (corresponding to one of them channel on radio frequency) carry out digital quadrature and sampling rate conversion, be transformed to base band orthogonal (I/Q) digital signal of the low sampling rate adapting with signal bandwidth, this 4 road I/Q base band data obtains required label echo signal through radio frequency reception path.
The invention still further relates to a kind of RFID equipment, in general, RFID equipment is rfid interrogator or the equipment with rfid interrogator module.In the RFID equipment relating in the present embodiment, have RFID radio-frequency module, this RFID radio-frequency module is above-mentioned RFID radio-frequency module.
The above embodiment has only expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (10)
1. the radio-frequency module for RFID equipment, described radio-frequency module is connected between the baseband control unit and antenna of described RFID equipment, described radio-frequency module comprises radio frequency sendaisle and radio frequency reception channel, described radio frequency sendaisle and described radio frequency reception channel are connected between the different port and described antenna of described baseband control unit, it is characterized in that, described antenna is the aerial array that comprises multiple antenna elements; Described radio frequency sendaisle comprises multiple for sending the radio frequency transmission subchannel of same frequency, out of phase radiofrequency signal, described multiple radio frequency sends subchannel and is obtained baseband signal and be converted into radiofrequency signal by the different port of described baseband control unit, and its phase place of directional coupler control by separately is also transferred to each antenna element of described antenna; Described radio-frequency module also comprise multichannel input a road output, for obtaining radiofrequency signal that different antennae unit receives the radio frequency converting switch of output, the input end of described radio frequency converting switch is connected with the directional coupler that described each radio frequency sends subchannel, and its output terminal is connected with the input end of described radio frequency reception channel.
2. the radio-frequency module for RFID equipment according to claim 1, is characterized in that, its output terminal of control signal control that described radio frequency converting switch is exported by described baseband control unit and input end are switched on or switched off order.
3. the radio-frequency module for RFID equipment according to claim 2, it is characterized in that, it is corresponding one by one with described antenna element quantity that the radio frequency that described radio frequency sendaisle comprises sends subchannel quantity, and each radio frequency sends subchannel and is connected to an antenna element by a directional coupler.
4. the radio-frequency module for RFID equipment according to claim 3, is characterized in that, described radio frequency sends subchannel and comprises D/A converter module, up-converter module, homology oscillator module, low-pass filtering module and power amplifier module; The digital signal of described baseband control unit output is converted to simulating signal by described D/A converter module, and being transported to described up-converter module, described up-converter module also receives the oscillator signal of described homology oscillator module output and the signal of described D/A converter module output is modulated on described oscillator signal; Carry modulated signal to carry out filtering to described low-pass filtering module; Filtered signal is transported to power amplifier module and carries out power amplification; Power amplifier module output signal sends the directional coupler of subchannel to described radio frequency.
5. the radio-frequency module for RFID equipment according to claim 4, is characterized in that, described radio frequency reception channel comprises power amplifier, low-pass filter, low-converter and analog-to-digital conversion module; Described power amplifier obtains radiofrequency signal by the output terminal of described radio frequency converting switch, is carried out being transported to described low-pass filter after power amplification and carries out filtering; Filtered signal carries out lower demodulation by low-converter and obtains simulating signal, is converted to digital signal and is transported to described baseband control unit by described analog-to-digital conversion module.
6. the radio-frequency module for RFID equipment according to claim 5, is characterized in that, the D/A converter module that described each radio frequency sends subelement is connected with described baseband control unit by parallel bus respectively.
7. the radio-frequency module for RFID equipment according to claim 6, it is characterized in that, send the parameter of the directional coupler of subchannel connection by controlling each radio frequency, make the phase place difference of the radiofrequency signal of described each antenna element transmission, and then obtain the synthetic wave beam of described antenna transmission.
8. the radio-frequency module for RFID equipment according to claim 7, it is characterized in that, described radio frequency converting switch is under the effect of described baseband control unit output control signal, make respectively the input port connection of the connection of the directional coupler corresponding with each antenna element successively of its output terminal, and obtain label echo signal by described radio frequency reception channel.
9. the radio-frequency module for RFID equipment according to claim 8, is characterized in that, the quantity of described antenna element is 4, and the quantity that described radio frequency sends subchannel is 4.
10. a RFID equipment, comprises for the radio-frequency module of sending and receiving radio frequency, it is characterized in that, described radio-frequency module is the radio-frequency module for RFID equipment as described in claim 1-9 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320830010.9U CN203630795U (en) | 2013-12-13 | 2013-12-13 | Radio frequency module for RFID equipment, and RFID equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320830010.9U CN203630795U (en) | 2013-12-13 | 2013-12-13 | Radio frequency module for RFID equipment, and RFID equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203630795U true CN203630795U (en) | 2014-06-04 |
Family
ID=50817252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320830010.9U Expired - Lifetime CN203630795U (en) | 2013-12-13 | 2013-12-13 | Radio frequency module for RFID equipment, and RFID equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203630795U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106326967A (en) * | 2015-06-29 | 2017-01-11 | 四川谦泰仁投资管理有限公司 | RFID chip with interactive switch input port |
| CN107403120A (en) * | 2015-02-02 | 2017-11-28 | 周立明 | Radio frequency identification positions and tracing equipment and mode |
| CN108198100A (en) * | 2017-12-29 | 2018-06-22 | 云南玄德智能科技有限公司 | A kind of estate management charges prompt system |
| CN110190916A (en) * | 2019-04-25 | 2019-08-30 | 维沃移动通信有限公司 | A kind of power-sensing circuit and terminal |
| CN110276222A (en) * | 2018-03-13 | 2019-09-24 | 长春师范大学 | A kind of RFID antenna device |
| CN113671270A (en) * | 2021-07-21 | 2021-11-19 | 西安空间无线电技术研究所 | Antenna testing system and method based on digital switch |
-
2013
- 2013-12-13 CN CN201320830010.9U patent/CN203630795U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107403120A (en) * | 2015-02-02 | 2017-11-28 | 周立明 | Radio frequency identification positions and tracing equipment and mode |
| CN106326967A (en) * | 2015-06-29 | 2017-01-11 | 四川谦泰仁投资管理有限公司 | RFID chip with interactive switch input port |
| CN106326967B (en) * | 2015-06-29 | 2023-05-05 | 四川谦泰仁投资管理有限公司 | RFID chip with interactive switch input port |
| CN108198100A (en) * | 2017-12-29 | 2018-06-22 | 云南玄德智能科技有限公司 | A kind of estate management charges prompt system |
| CN110276222A (en) * | 2018-03-13 | 2019-09-24 | 长春师范大学 | A kind of RFID antenna device |
| CN110190916A (en) * | 2019-04-25 | 2019-08-30 | 维沃移动通信有限公司 | A kind of power-sensing circuit and terminal |
| CN110190916B (en) * | 2019-04-25 | 2021-03-23 | 维沃移动通信有限公司 | Power detection circuit and terminal |
| CN113671270A (en) * | 2021-07-21 | 2021-11-19 | 西安空间无线电技术研究所 | Antenna testing system and method based on digital switch |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203630795U (en) | Radio frequency module for RFID equipment, and RFID equipment | |
| CN103218644B (en) | A kind of super high frequency electronic label read/write of carrier wave cancellation | |
| US7986235B2 (en) | RFID receive-only system | |
| CN101303736B (en) | Multi-protocol ultrahigh frequency reader-writer | |
| CN103297157A (en) | Antenna detecting method for multi-antenna ultrahigh-frequency radiofrequencyidentification reader-writer | |
| CN103632177A (en) | Double-line box three-dimensional channel device | |
| US9430683B1 (en) | Passive self-jammer cancellation in RFID systems | |
| CN103577857A (en) | RFID three-dimensional detecting device and use method thereof | |
| CN103067059A (en) | Short wave receiving and sending communication channel process device based on delayed diversity and compact peripheral component interconnect (CPCI) bus | |
| CN102354370A (en) | RFID (radio frequency identification) ultrahigh-frequency reader-writer containing multichannel antenna expansion circuit | |
| CN102968649A (en) | Radio frequency identification system based on open type software radio platform | |
| WO2013163809A1 (en) | Rfid system, reader in rfid system, addressing method for antenna in rfid system and cascaded antennas in rfid system | |
| CN103218642A (en) | Multi-antenna ultrahigh frequency electronic tag reader | |
| CN203133898U (en) | Embedded ultrahigh frequency multichannel RFID reader | |
| CN201562287U (en) | Multi-band multi-protocol RFID intelligent reader with broad application scope | |
| CN203588286U (en) | Double-wire-frame three-dimensional channel device | |
| Galler et al. | SDR based EPC UHF RFID reader DS-SS localization testbed | |
| CN102110232B (en) | RFID intelligent reader-writer with multiple frequency bands and protocols | |
| CN103235962B (en) | A kind of elimination launches the super high frequency electronic label read/write disturbed | |
| CN102256018B (en) | Mobile phone with integrated RFID (Radio Frequency Identification) function and communication method thereof | |
| CN103545608B (en) | Intelligent bookshelf radio-frequency antenna and system | |
| JP5137128B2 (en) | RFID reader / writer | |
| CN103219958A (en) | Ultrahigh-frequency dual-band power amplifying circuit | |
| CN203150692U (en) | Large power radio frequency antenna accords with ISO14443TYPEB | |
| CN102982297B (en) | Label test system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140604 |