CN104217184A - Novel UHF (Ultra High Frequency) RFID (Radio Frequency Identification Device) reader transmitter - Google Patents
Novel UHF (Ultra High Frequency) RFID (Radio Frequency Identification Device) reader transmitter Download PDFInfo
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- CN104217184A CN104217184A CN201410160446.0A CN201410160446A CN104217184A CN 104217184 A CN104217184 A CN 104217184A CN 201410160446 A CN201410160446 A CN 201410160446A CN 104217184 A CN104217184 A CN 104217184A
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Abstract
The invention discloses a UHF (Ultra High Frequency) RFID (Radio Frequency Identification Device) reader transmitter, belonging to the field of radio frequency identification technologies. The UHF RFID reader transmitter comprises an MCU (Micro Controller Unit) controller, a direct digital synthesizer (DDS), a Balun, a surface acoustic wave (SAW) filter, a power amplifier and an antenna. The UHF RFID reader transmitter is characterized in that the controller carries out ultra-Nyquist operation on the DDS, the Balun is used for converting a differential signal output by the DDS to a single-ended signal, and a band-pass SAW filter is used for filtering fundamental wave and other useless mirror images, and reserving useful mirror image frequencies. The power amplifier is used for carrying out power amplification on the reserved useful radio frequency signal and transmitting the reserved useful radio frequency signal to the antenna so as to be transmitted. According to the UHF RFID reader transmitter, ultra-Nyquist operation is carried out on the DDS to generate the radio frequency signal directly, and an up-converter and a local oscillator in the existing framework are no longer needed, so that the framework of the existing reader is greatly simplified and the cost is reduced.
Description
Technical field
The present invention relates to a kind of REID, particularly a kind of UHF RFID reader transmitter.
Background technology
Along with the development of infotech, Internet of Things has developed into a new industry, and as one of the basis of Internet of Things, radio-frequency (RF) identification (RFID, Radio Frequency Identi-fication) technology has become the technology that people more and more pay close attention to.Rfid system forms primarily of three parts: transponder (radio-frequency card and electronic tag), reader (read write line and base station) and host computer main system (middleware and network application).Can be divided into low frequency (LF), high frequency (HF), ultrahigh frequency (UHF) and microwave (MW) four class according to frequency, its application is different.The typical frequency of high-frequency RF ID is 13.56MHz, and reading distance, within 1 meter, is mainly used in library, ID (identity number) card etc. and closely identifies.The typical operating frequency of UHF RFID is 860MHz ~ 960MHz, and reading distance can reach 10 meters, is mainly used in the field such as logistics, retail.
Compared with HF RFID, there are some advantages in UHF RFID technique: read or write speed is fast, can read a large amount of label simultaneously, can position.But the frequency of operation of UHF RFID reader is high, often need repeatedly up-conversion, its complex structure, cost remains high, and makes it can not widespread use.Also there are some for the special chip of UHF RFID reader at present, but are reduction of the dirigibility of design.
In view of the deficiency of above-mentioned UHF RFID reader, propose a kind of novel reader transmitter architecture here, can existing structure be simplified, reduce reader cost, make UHF RFID technique have more practicality in field of radio frequency identification.
Summary of the invention
In order to reduce the complexity of UHF RFID reader, reduce costs, the embodiment of the present invention proposes a kind of reader transmitter schemes using Direct Digital Synthesizer (DDS) directly to produce radiofrequency signal, and described technical scheme is as follows:
A novel UHF RFID reader transmitter, described transmitter comprises: MCU controller, DDS, Ba Lun, SAW filter, power amplifier, antenna.
Described MCU controller is connected with DDS by universal serial bus, controls DDS; Described DDS exports and is connected with Ba Lun; Described Ba Lun is connected with SAW filter; Described SAW filter is connected with power amplifier; Described power amplifier is connected with antenna.First-harmonic during described SAW filter filtering DDS outputs signal and useless mirror image composition, retain the mirror image composition needed.
The beneficial effect of the technical scheme that the embodiment of the present invention provides is:
Directly produce radiofrequency signal with DDS, no longer need the upconverter in existing transmitter and local oscillator, reduce the complexity of transmitter, reduce reader cost simultaneously.
Accompanying drawing illustrates:
In order to be illustrated more clearly in inventive embodiments or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, not paying under the laborious prerequisite of creation, other design can also be obtained with reference to the accompanying drawings.
Fig. 1 is the schematic block diagram that example of the present invention provides.
Fig. 2 is DDS output signal spectrum.
Embodiment:
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.It should be noted that the embodiments described herein is only for illustrating, is not limited to the present invention.
In order to simplify UHF RFID reader, reducing costs, the present invention proposes the reader transmitter schemes that a kind of DDS directly produces radiofrequency signal.
Consult shown in Fig. 1, it is the schematic block diagram of example of the present invention.This UHF RFID transmitter comprises MCU controller, DDS, Ba Lun, SAW filter, power amplifier, antenna.MCU controller is communicated with DDS by universal serial bus, transmits control signal, and produces the signal of a 85MHz.Those skilled in the art will appreciate that described DDS internal output terminal is digital to analog converter (DAC), the frequency spectrum of its output signal is consulted shown in Fig. 2.Using the bandwidth of 1/2nd sample frequency as a Nyquist band, DAC output signal is except the fundamental signal itself being positioned at the first Nyquist band, be positioned at the mirror image of other Nyquist band in addition, especially, the 3rd mirror image being positioned at the 4th Nyquist band is the 915MHz radiofrequency signal needed.Traditional method is with the useless mirror image of low-pass filter filtering, retains the fundamental signal in the first Nyquist band, then is converted to radio frequency band by frequency mixer.The SAW bandpass filter that the present invention uses relative bandwidth very narrow, retains 915MHz image frequency, filtering first-harmonic and other useless mirror images, namely to the operation of DDS super Nyquist, thus directly produces radiofrequency signal.Amplified by power amplifier again, gone out from antenna transmission.The effect of Ba Lun is that the differential signal that DDS exports is converted to single-ended signal.Because radiofrequency signal is directly produced by DDS, thus no longer need upconverter and local oscillator, simplify the framework of transmitter.
Further, select the bandpass filter of DDS outgoing mirror picture to have multiple choices, during specific implementation, the embodiment of the present invention is not restricted this.
Further, the system clock frequency of DDS and output frequency can have multiple choices scheme, and during specific implementation, the embodiment of the present invention is not restricted this.
During specific implementation, the embodiment of the present invention does not limit realizing chip kind selected by identity function.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiments, the invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
Above-described embodiment is the present invention's preferably embodiment; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (3)
1. a novel UHF RFID reader transmitter, by MCU controller by serial bus control DDS, the differential signal of generation is gone out to antenna transmission via Ba Lun, SAW filter, power amplifier.
2. UHF RFID reader transmitter as claimed in claim 1, it is characterized in that, mirror image composition DDS being produced signal amplifies, filtering first-harmonic and other useless mirror images, the direct radiofrequency signal needed that produces gives antenna, and no longer needs upconverter and local oscillator.
3. UHF RFID reader transmitter as claimed in claim 1, is characterized in that the modulation being carried out settling signal by DDS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410160446.0A CN104217184A (en) | 2014-04-18 | 2014-04-18 | Novel UHF (Ultra High Frequency) RFID (Radio Frequency Identification Device) reader transmitter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410160446.0A CN104217184A (en) | 2014-04-18 | 2014-04-18 | Novel UHF (Ultra High Frequency) RFID (Radio Frequency Identification Device) reader transmitter |
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| CN104217184A true CN104217184A (en) | 2014-12-17 |
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| CN201410160446.0A Pending CN104217184A (en) | 2014-04-18 | 2014-04-18 | Novel UHF (Ultra High Frequency) RFID (Radio Frequency Identification Device) reader transmitter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106127091A (en) * | 2016-06-30 | 2016-11-16 | 天津工业大学 | A kind of intelligent UHFRFID reader based on DSP |
| CN106250788A (en) * | 2016-07-27 | 2016-12-21 | 天津工业大学 | The method of passive ultra-high frequency RFID system based on smart antenna suppression multi-path jamming |
| CN108020344A (en) * | 2017-07-27 | 2018-05-11 | 南京航空航天大学 | The SAW ID-tag temp measuring system and method that time-division, time-division are combined with code division, time-division with frequency division, time-division with code division with frequency division |
| CN108062495A (en) * | 2017-12-29 | 2018-05-22 | 广东华大互联网股份有限公司 | A kind of system and method that remote RF Card Readers are realized using transmitting-receiving separation |
| CN109075807A (en) * | 2016-04-13 | 2018-12-21 | 华为技术加拿大有限公司 | System and method for super Nyquist (FTN) transmission |
| CN112068057A (en) * | 2020-08-31 | 2020-12-11 | 中电科仪器仪表有限公司 | Self-adaptive calibration compensation method for accurate power display |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109075807A (en) * | 2016-04-13 | 2018-12-21 | 华为技术加拿大有限公司 | System and method for super Nyquist (FTN) transmission |
| CN109075807B (en) * | 2016-04-13 | 2022-06-07 | 华为技术加拿大有限公司 | System and method for Faster Than Nyquist (FTN) transmission |
| CN106127091A (en) * | 2016-06-30 | 2016-11-16 | 天津工业大学 | A kind of intelligent UHFRFID reader based on DSP |
| CN106250788A (en) * | 2016-07-27 | 2016-12-21 | 天津工业大学 | The method of passive ultra-high frequency RFID system based on smart antenna suppression multi-path jamming |
| CN108020344A (en) * | 2017-07-27 | 2018-05-11 | 南京航空航天大学 | The SAW ID-tag temp measuring system and method that time-division, time-division are combined with code division, time-division with frequency division, time-division with code division with frequency division |
| CN108020344B (en) * | 2017-07-27 | 2020-03-17 | 南京航空航天大学 | Surface acoustic wave label temperature measurement system and method combining time division, time division and frequency division, time division and code division, and time division and code division |
| CN108062495A (en) * | 2017-12-29 | 2018-05-22 | 广东华大互联网股份有限公司 | A kind of system and method that remote RF Card Readers are realized using transmitting-receiving separation |
| CN112068057A (en) * | 2020-08-31 | 2020-12-11 | 中电科仪器仪表有限公司 | Self-adaptive calibration compensation method for accurate power display |
| CN112068057B (en) * | 2020-08-31 | 2023-02-17 | 中电科思仪科技股份有限公司 | Self-adaptive calibration compensation method for accurate power display |
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Application publication date: 20141217 |