CN203350897U - UHF read-write module of mobile data terminal - Google Patents
UHF read-write module of mobile data terminal Download PDFInfo
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- CN203350897U CN203350897U CN2013203275967U CN201320327596U CN203350897U CN 203350897 U CN203350897 U CN 203350897U CN 2013203275967 U CN2013203275967 U CN 2013203275967U CN 201320327596 U CN201320327596 U CN 201320327596U CN 203350897 U CN203350897 U CN 203350897U
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical group [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 5
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Abstract
The utility model relates to a UHF read-write module of a mobile data terminal. The module comprises a power supply module, a processing control module, a RFID read-write chip module, and a radio frequency transceiver module, wherein the processing control module, the RFID read-write chip module and the radio frequency transceiver module are connected with the power supply module. The processing control module is communicated with the RFID read-write chip module. The RFID read-write chip module is communicated with the radio frequency transceiver module to form a radio frequency transmitting circuit and a radio frequency receiving circuit. The radio frequency transceiver module comprises a power amplifier, a wave filter and a directional coupler. The wave filter comprises a band-pass filter and a low-pass filter. The output end of the band-pass filter is connected with an input end of a power amplifier. The output end of the power amplifier is connected with the input end of the low-pass filter. The output end of the low-pass filter is connected with the input end of the directional coupler. The straight-through end of the directional coupler is used for transmitting and receiving signals. The module is small in size and low in power consumption, and effectively improves sensitivity and stability of transmission and receiving of radio frequency signals.
Description
Technical field
The utility model relates to a kind of mobile data terminal UHF module for reading and writing.
Background technology
It is far away that super high frequency radio frequency identification (UHF RFID) technology has reading/writing distance, many tag recognition, and the advantages such as security height, be widely used in the industries such as logistics, Wine anti-counterfeit, clothes, personnel control, food security, tobacco management.The effect of the ultrahigh frequency module for reading and writing of mobile data terminal is to send modulation wave signal to one or more label, label is by same modulated RF carrier wave received power, the tag reflection signal be activated, module for reading and writing carries out demodulation, amplification, decoding and decoding by the echoed signal that tag reflection is returned to be processed, realization, to fixing of electronic tag storage inside or reading of peculiar data, also can be rewritten the data of electronic tag.The label information that mobile data terminal reads the ultrahigh frequency module for reading and writing is stored, and sends background server to by communication module.
The working frequency range of ultrahigh frequency RFID module for reading and writing is 860～960MHz, the EPC Class1 Gen2 standard that the ISO18000-6C that the compatible ISO of air interface standard organizes to set up and EPCglobal organize to set up.Module for reading and writing can read at a distance to the electronic tag that meets above-mentioned two kinds of standards.
Mobile data terminal UHF read write line exists power consumption large at present, tag read distance is short, many tag recognition reading performance is poor, and size is larger, be inconvenient to be integrated on some mobile data terminals some problems that wait, moreover, the read-write sensitivity of existing mobile data terminal UHF read write line need to improve.
The utility model content
For above-mentioned technical matters, it is little, low in energy consumption that technical problem to be solved in the utility model is to provide a kind of size, the mobile data terminal UHF module for reading and writing that the radiofrequency signal transmitting-receiving is sensitiveer.
The utility model is in order to solve the problems of the technologies described above by the following technical solutions: the utility model has designed a kind of mobile data terminal UHF module for reading and writing, comprises power module and the processing and control module be connected with power module respectively, RFID read-write chip module, radio-frequency (RF) receiving and transmission module; Power module is that modules is powered, and processing and control module intercoms mutually with RFID read-write chip module, and RFID read-write chip module intercoms mutually and forms radio-frequency transmissions circuit and radio-frequency (RF) receiving circuit with radio-frequency (RF) receiving and transmission module; Radio-frequency (RF) receiving and transmission module comprises power amplifier, wave filter and directional coupler, described wave filter comprises bandpass filter and low-pass filter, the output terminal of bandpass filter is connected with the input end of power amplifier, the output terminal of power amplifier is connected with the input end of low-pass filter, the output terminal of low-pass filter is connected with the input end of directional coupler, and the straight-through end of directional coupler is received and dispatched signal.
As a preferred technical solution of the present invention: described radio-frequency (RF) receiving and transmission module also comprises wave detector, and the input end of wave detector is connected with the coupled end of described directional coupler, and the output terminal of wave detector is connected with described processing and control module.
As a preferred technical solution of the present invention: described RFID read-write chip module comprises that local oscillator eliminates circuit, and the local oscillation signal coupled end that the coupled end of described directional coupler is eliminated circuit with local oscillator simultaneously is connected.
As a preferred technical solution of the present invention: described radio-frequency (RF) receiving and transmission module also comprises the first non-equilibrium balun, the second non-equilibrium balun and the 3rd non-equilibrium balun, and the signal output part of described RFID read-write chip module, signal input part, local oscillation signal coupled end intercom mutually and form radio-frequency transmissions circuit, radio-frequency (RF) receiving circuit and local oscillator bucking circuit through the first non-equilibrium balun, the second non-equilibrium balun and the 3rd non-equilibrium balun and radio-frequency (RF) receiving and transmission module respectively; Wherein, the signal output part of described RFID read-write chip module is connected with the input end of described bandpass filter through the first non-equilibrium balun, the signal input part of RFID read-write chip module is connected with the isolation end of described directional coupler through the second non-equilibrium balun, and the local oscillation signal coupled end in RFID read-write chip module is connected with the coupled end of described directional coupler through the 3rd non-equilibrium balun.
As a preferred technical solution of the present invention: described power module is comprised of power supply passive filter circuit and power supply stabilization circuit, the output terminal of power supply passive filter circuit is connected with the input end of power supply stabilization circuit, by the output terminal of power supply stabilization circuit, is that modules in mobile data terminal UHF module for reading and writing is powered.
As a preferred technical solution of the present invention: described mobile data terminal UHF module for reading and writing also comprises the temperature sensor be connected with described processing and control module, temperature sensor detects the temperature signal of described power amplifier in real time, sends to processing and control module.
As a preferred technical solution of the present invention: described power module is lithium battery.
As a preferred technical solution of the present invention: described processing and control module is arm processor.
As a preferred technical solution of the present invention: described processing and control module and RFID read-write chip module adopt the high-speed synchronous serial line interface to communicate.
A kind of mobile data terminal UHF module for reading and writing described in the utility model adopts above technical scheme compared with prior art, has following technique effect:
(1) the mobile data terminal UHF module for reading and writing of the utility model design, for the wave filter in radio-frequency (RF) receiving and transmission module, adopted bandpass filter and low-pass filter, effectively reduces band stray, improved the reception sensitivity of module;
(2) the mobile data terminal UHF module for reading and writing of the utility model design, on the improvement basis for the radio-frequency (RF) receiving and transmission module median filter, set up wave detector, realized the automatic regulation function of module radiofrequency signal transmitted power;
(3) in the mobile data terminal UHF module for reading and writing of the utility model design, adopt local oscillator to eliminate circuit, can effectively improve the sensitivity that RFID read-write chip module receives radiofrequency signal;
(4) in the mobile data terminal UHF module for reading and writing of the utility model design, by power amplifier is carried out to real time temperature measurement, again by processing and control module according to the temperature signal detected, work to whole UHF module for reading and writing is controlled, the protection of realization to device, improved the reliability of installing;
(5) in the mobile data terminal UHF module for reading and writing of the utility model design, for radio-frequency transmissions circuit and radio-frequency (RF) receiving circuit, added non-equilibrium balun, make the input and output of radiofrequency signal in RFID read-write chip module all adopt equilibrium form, the signal that has reduced RFID read-write chip module input and output terminal disturbs;
(6) in the mobile data terminal UHF module for reading and writing of the utility model design, processing and control module and RFID read-write chip module adopt the high-speed synchronous serial line interface to communicate, and have effectively guaranteed quick and stable data interaction between the two.
The accompanying drawing explanation
Fig. 1 is the allomeric function module diagram of the mobile data terminal UHF module for reading and writing of the utility model design;
Fig. 2 is the high-level schematic functional block diagram between radio-frequency (RF) receiving and transmission module in the mobile data terminal UHF module for reading and writing of the utility model design, RFID read-write chip module, processing and control module three;
Fig. 3 is the control schematic diagram of the mobile data terminal UHF module for reading and writing of the utility model design;
Fig. 4 is the mobile data terminal block diagram of the mobile data terminal UHF module for reading and writing application of the utility model design.
Embodiment
Below in conjunction with Figure of description, embodiment of the present utility model is described in further detail.
As shown in Figure 1 to Figure 3, the utility model has designed a kind of mobile data terminal UHF module for reading and writing, comprises power module and the processing and control module be connected with power module respectively, RFID read-write chip module, radio-frequency (RF) receiving and transmission module; Power module is that modules is powered, and processing and control module intercoms mutually with RFID read-write chip module, and RFID read-write chip module intercoms mutually and forms radio-frequency transmissions circuit and radio-frequency (RF) receiving circuit with radio-frequency (RF) receiving and transmission module; Radio-frequency (RF) receiving and transmission module comprises power amplifier, wave filter and directional coupler, described wave filter comprises bandpass filter and low-pass filter, the output terminal of bandpass filter is connected with the input end of power amplifier, the output terminal of power amplifier is connected with the input end of low-pass filter, the output terminal of low-pass filter is connected with the input end of directional coupler, and the straight-through end of directional coupler is received and dispatched signal.
The mobile data terminal UHF module for reading and writing of the utility model design, for the wave filter in radio-frequency (RF) receiving and transmission module, adopted bandpass filter and low-pass filter, effectively reduces band stray, improved the reception sensitivity of module.
As a preferred technical solution of the present invention: described radio-frequency (RF) receiving and transmission module also comprises wave detector, and the input end of wave detector is connected with the coupled end of described directional coupler, and the output terminal of wave detector is connected with described processing and control module.
The mobile data terminal UHF module for reading and writing of the utility model design, on the improvement basis for the radio-frequency (RF) receiving and transmission module median filter, set up wave detector, realized the automatic regulation function of module radiofrequency signal transmitted power.
As a preferred technical solution of the present invention: described RFID read-write chip module comprises that local oscillator eliminates circuit, and the local oscillation signal coupled end that the coupled end of described directional coupler is eliminated circuit with local oscillator simultaneously is connected.
In the mobile data terminal UHF module for reading and writing of the utility model design, adopt local oscillator to eliminate circuit, can effectively improve the sensitivity that RFID read-write chip module receives radiofrequency signal.
As a preferred technical solution of the present invention: described radio-frequency (RF) receiving and transmission module also comprises the first non-equilibrium balun, the second non-equilibrium balun and the 3rd non-equilibrium balun, and the signal output part of described RFID read-write chip module, signal input part, local oscillation signal coupled end intercom mutually and form radio-frequency transmissions circuit, radio-frequency (RF) receiving circuit and local oscillator bucking circuit through the first non-equilibrium balun, the second non-equilibrium balun and the 3rd non-equilibrium balun and radio-frequency (RF) receiving and transmission module respectively; Wherein, the signal output part of described RFID read-write chip module is connected with the input end of described bandpass filter through the first non-equilibrium balun, the signal input part of RFID read-write chip module is connected with the isolation end of described directional coupler through the second non-equilibrium balun, and the local oscillation signal coupled end in RFID read-write chip module is connected with the coupled end of described directional coupler through the 3rd non-equilibrium balun.
In the mobile data terminal UHF module for reading and writing of the utility model design, for radio-frequency transmissions circuit and radio-frequency (RF) receiving circuit, added non-equilibrium balun, make the input and output of radiofrequency signal in RFID read-write chip module all adopt equilibrium form, the signal that has reduced RFID read-write chip module input and output terminal disturbs.
As a preferred technical solution of the present invention: described power module is comprised of power supply passive filter circuit and power supply stabilization circuit, the output terminal of power supply passive filter circuit is connected with the input end of power supply stabilization circuit, by the output terminal of power supply stabilization circuit, is that modules in mobile data terminal UHF module for reading and writing is powered.
As a preferred technical solution of the present invention: described mobile data terminal UHF module for reading and writing also comprises the temperature sensor be connected with described processing and control module, temperature sensor detects the temperature signal of described power amplifier in real time, sends to processing and control module.
In the mobile data terminal UHF module for reading and writing of the utility model design; by power amplifier is carried out to real time temperature measurement, then by processing and control module according to the temperature signal detected, the work of whole UHF module for reading and writing is controlled; the protection of realization to device, improved the reliability of installing.
As a preferred technical solution of the present invention: described power module is lithium battery.
As a preferred technical solution of the present invention: described processing and control module is arm processor.
As a preferred technical solution of the present invention: described processing and control module and RFID read-write chip module adopt the high-speed synchronous serial line interface to communicate.
In the mobile data terminal UHF module for reading and writing of the utility model design, processing and control module and RFID read-write chip module adopt the high-speed synchronous serial line interface to communicate, and have effectively guaranteed quick and stable data interaction between the two.
The mobile data terminal UHF module for reading and writing of the utility model design is in application, because having local oscillator, described RFID read-write chip inside eliminates circuit, so the signal output part of RFID read-write chip module, local oscillation signal coupled end, signal receiving end, be connected with the input end of bandpass filter, the coupled end of directional coupler, the isolation end of directional coupler respectively.
In application process, the operations such as processing (comprising local oscillator elimination, modulation /demodulation, coding and decoding) to radiofrequency signal in RFID read-write chip module all are integrated in RFID read-write chip inside modules, the derived reference signal of RFID read-write chip module is provided by the external temperature compensated crystal oscillator, then form required radio-frequency carrier signal by inner phase-locked loop circuit, and pass through external loop filter.
RFID read-write chip module intercoms mutually with radio-frequency (RF) receiving and transmission module in the radio-frequency transmissions circuit formed, the radiofrequency signal of RFID read-write chip module output inputs to the input end of bandpass filter through the first non-equilibrium balun, after bandpass filter sends to power amplifier to be amplified radiofrequency signal the radiofrequency signal received, send to low-pass filter, then sent by the straight-through end antenna of directional coupler warp.The radiofrequency signal sent, through being connected on bandpass filter on the power amplifier link and the filtering of low-pass filter, has suppressed the interference of UHF module for reading and writing emitting radio frequency signal to the adjacent channel of other communication module.
RFID read-write chip module intercoms mutually with radio-frequency (RF) receiving and transmission module in the radio-frequency (RF) receiving circuit formed, directional coupler in radio-frequency (RF) receiving and transmission module is received radiofrequency signal through antenna by straight-through termination, and by isolation end, radiofrequency signal is sent to RFID read-write chip module; The mobile data terminal UHF module for reading and writing of the utility model design, pass through the straight-through end of directional coupler for radiofrequency signal, and adopt the same antenna to carry out sending and receiving.
In the mobile data terminal UHF module for reading and writing application process of the utility model design, in radio-frequency (RF) receiving and transmission module, coupled end output radiofrequency signal by directional coupler obtains the emission of radio frequency signals performance number through wave detector, and the emission of radio frequency signals performance number is sent to processing and control module, processing and control module is by the gain adjustable power amplifier of fine setting RFID read-write chip inside modules, make real output meet design objective, improved the consistance of product; Simultaneously, the coupled end output signal of directional coupler is after the decay of 10dB, be sent to the local oscillation signal coupled end in RFID read-write chip module through the 3rd non-equilibrium balun again, the local oscillator in RFID read-write chip module is eliminated circuit and is improved the receiving sensitivity of module for radiofrequency signal.
In the mobile data terminal UHF module for reading and writing application process of the utility model design, near the set temperature sensor power amplifier of thermal value maximum, the temperature signal of real-time detection power amplifier, send to processing and control module, when the temperature of power amplifier reaches the warning temperature, processing and control module finishes the work of other circuit, reaches the purpose of protection power amplifier, reliability and the serviceable life of having improved product; Simultaneously, processing and control module is carried out bias voltage control to power amplifier.
Operating voltage in the mobile data terminal UHF module for reading and writing application process of the utility model design is by external lithium battery voltage fed, wherein, lithium battery voltage is powered to other circuit successively after power supply passive filter circuit, power supply stabilization circuit, and, only have power amplifier to adopt power supply passive filter circuit output direct feed.
The mobile data terminal UHF module for reading and writing of the utility model design is in the middle of actual application, and described processing and control module is arm processor, and arm processor is selected 32 ARM7 processors of Atmel (liking special Mel) company;
As shown in Figure 4, the mobile data terminal UHF module for reading and writing of the utility model design is applied to mobile data terminal, in the operating system processing platform of mobile data terminal, realize the application of label is processed, UHF module for reading and writing of the present utility model not only can with other automatically identification module as the one-dimensional scanning head or camera compatible practical, and can with GSM or the WIFI communication module is compatible use.
In the mobile data terminal UHF module for reading and writing of the utility model design, the main power consumption components and parts are power amplifier, the working method of power amplifier is just worked for only having when upper computer software sends querying command, so power amplifier is not continuous working, avoided so to a certain extent the waste of electric energy.The mobile data terminal UHF module for reading and writing of the utility model design is under holding state, only have processing and control module in running order, other module is not worked, and higher circuit part adopts the DC-DC circuit of high conversion efficiency to power consumption, reduced to a certain extent the power consumption of UHF module for reading and writing.
In the mobile data terminal UHF module for reading and writing of the utility model design, adopt and have the RFID read-write chip module that local oscillator is eliminated circuit, improved so to a certain extent the receiving sensitivity of module to radiofrequency signal, improved the performance of UHF module for reading and writing.
The mobile data terminal UHF module for reading and writing of the utility model design, necessarily require in application to use with other communication module is compatible, such as communication module GSM, WIFI, EVDO etc.In practical application, for the integral installation of UHF module for reading and writing shielding case, so both can eliminate the external electromagnetic interference (EMI) of UHF module for reading and writing and also can suppress the electromagnetic interference (EMI) of other module to this UHF module for reading and writing, make the work that the UHF module for reading and writing can be normally stable.
The UHF module for reading and writing size of the utility model design is little, is applied on mobile data terminal, mates corresponding antenna, just can read and write at a distance the electronic tag that meets corresponding UHF agreement.
The mobile data terminal UHF module for reading and writing read write tag distance of the utility model design, and the label of compatible read-write ISO18000-6C series and EPC Gen2 agreement, and can be widely used in numerous industries such as the substandard logistics in countries in the world, clothes, Wine anti-counterfeit, tobacco.
The above is explained in detail embodiment of the present utility model by reference to the accompanying drawings, but the utility model is not limited to above-mentioned embodiment, in the ken possessed those of ordinary skills, can also under the prerequisite that does not break away from the utility model aim, make a variety of changes.
Claims (9)
1. a mobile data terminal UHF module for reading and writing, comprise power module and the processing and control module be connected with power module respectively, RFID read-write chip module, radio-frequency (RF) receiving and transmission module; Power module is that modules is powered, and processing and control module intercoms mutually with RFID read-write chip module, and RFID read-write chip module intercoms mutually and forms radio-frequency transmissions circuit and radio-frequency (RF) receiving circuit with radio-frequency (RF) receiving and transmission module; Radio-frequency (RF) receiving and transmission module comprises power amplifier, wave filter and directional coupler, it is characterized in that: described wave filter comprises bandpass filter and low-pass filter, the output terminal of bandpass filter is connected with the input end of power amplifier, the output terminal of power amplifier is connected with the input end of low-pass filter, the output terminal of low-pass filter is connected with the input end of directional coupler, and the straight-through end of directional coupler is received and dispatched signal.
2. a kind of mobile data terminal UHF module for reading and writing according to claim 1, it is characterized in that: described radio-frequency (RF) receiving and transmission module also comprises wave detector, the input end of wave detector is connected with the coupled end of described directional coupler, and the output terminal of wave detector is connected with described processing and control module.
3. a kind of mobile data terminal UHF module for reading and writing according to claim 2, it is characterized in that: described RFID read-write chip module comprises local oscillator elimination circuit, and the coupled end of described directional coupler is connected with the local oscillation signal coupled end of local oscillator elimination circuit simultaneously.
4. a kind of mobile data terminal UHF module for reading and writing according to claim 3, it is characterized in that: described radio-frequency (RF) receiving and transmission module also comprises the first non-equilibrium balun, the second non-equilibrium balun and the 3rd non-equilibrium balun, and the signal output part of described RFID read-write chip module, signal input part, local oscillation signal coupled end intercom mutually and form radio-frequency transmissions circuit, radio-frequency (RF) receiving circuit and local oscillator bucking circuit through the first non-equilibrium balun, the second non-equilibrium balun and the 3rd non-equilibrium balun and radio-frequency (RF) receiving and transmission module respectively; Wherein, the signal output part of described RFID read-write chip module is connected with the input end of described bandpass filter through the first non-equilibrium balun, the signal input part of RFID read-write chip module is connected with the isolation end of described directional coupler through the second non-equilibrium balun, and the local oscillation signal coupled end in RFID read-write chip module is connected with the coupled end of described directional coupler through the 3rd non-equilibrium balun.
5. a kind of mobile data terminal UHF module for reading and writing according to claim 1, it is characterized in that: described power module is comprised of power supply passive filter circuit and power supply stabilization circuit, the output terminal of power supply passive filter circuit is connected with the input end of power supply stabilization circuit, by the output terminal of power supply stabilization circuit, is that modules in mobile data terminal UHF module for reading and writing is powered.
6. a kind of mobile data terminal UHF module for reading and writing according to claim 1, it is characterized in that: described mobile data terminal UHF module for reading and writing also comprises the temperature sensor be connected with described processing and control module, temperature sensor detects the temperature signal of described power amplifier in real time, sends to processing and control module.
7. a kind of mobile data terminal UHF module for reading and writing according to claim 1, it is characterized in that: described power module is lithium battery.
8. a kind of mobile data terminal UHF module for reading and writing according to claim 1, it is characterized in that: described processing and control module is arm processor.
9. a kind of mobile data terminal UHF module for reading and writing according to claim 1, it is characterized in that: described processing and control module and RFID read-write chip module adopt the high-speed synchronous serial line interface to communicate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013203275967U CN203350897U (en) | 2013-06-07 | 2013-06-07 | UHF read-write module of mobile data terminal |
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| CN2013203275967U CN203350897U (en) | 2013-06-07 | 2013-06-07 | UHF read-write module of mobile data terminal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111988066A (en) * | 2020-09-11 | 2020-11-24 | 南京陆加壹智能科技有限公司 | A UHF RFID discrete component read and write module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111988066A (en) * | 2020-09-11 | 2020-11-24 | 南京陆加壹智能科技有限公司 | A UHF RFID discrete component read and write module |
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Address after: No.15 Xinghuo Road, Jiangbei new district, Nanjing, Jiangsu Province, 210031 Patentee after: Dongji Technology Co.,Ltd. Address before: No. 23, Huashen Avenue, Yuhua District, Nanjing, Jiangsu 210098 Patentee before: JIANGSU SEUIC TECHNOLOGY Co.,Ltd. |
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Granted publication date: 20131218 |