Impedance-adjustable tag antenna applied to UHF (ultrahigh frequency) RFID (radio-frequency identification) system

A tag antenna and frequency band technology, applied in the field of radio frequency identification electronic tags, can solve the problems of limiting the tuning value of tag antennas, unable to take into account wide bandwidth characteristics and impedance tunable characteristics, and limited impedance tunable range, etc., to achieve good broadband characteristics, Stable and reliable performance and the effect of expanding bandwidth

Inactive Publication Date: 2013-04-03
BEIJING UNIV OF POSTS & TELECOMM
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  • Abstract
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Problems solved by technology

[0005] Secondly, the current existing antenna design technology cannot take into account both wide bandwidth characteristics and impedance tunable characteristics. The tuning value of tag antennas for many different application environments

Method used

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  • Impedance-adjustable tag antenna applied to UHF (ultrahigh frequency) RFID (radio-frequency identification) system
  • Impedance-adjustable tag antenna applied to UHF (ultrahigh frequency) RFID (radio-frequency identification) system
  • Impedance-adjustable tag antenna applied to UHF (ultrahigh frequency) RFID (radio-frequency identification) system

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Embodiment Construction

[0020] This solution is a UHF radio frequency identification, impedance tunable, dual-band resonance high-gain tag antenna used in China's UHF frequency band (840MHz-845MHz and 920MHz-925MHz) RFID system. The tag antenna of the present invention realizes the design of ultra-high frequency, adjustable impedance, and high-gain tag antenna by adopting a ∏-type matching network. The tag chip adopts an NXP ultra-high frequency radio frequency chip, and the impedance of the chip at 915MHz is (14.8-j* 128) Ohm. The tag antenna of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] The UHF frequency band RFID impedance tunable tag antenna of the present invention has a tag structure comprising: 1, an antenna radiator 2, a dielectric plate 3, and a tag chip. UHF band RFID impedance tunable tag antenna top view and side view respectively as follows figure 1 and figure 2 As shown, the equivalent circuit diagram of the UHF band...

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Abstract

The invention relates to the field of RFID (radio-frequency identification) electronic tags, in particular to an impedance-adjustable broadband tag antenna applied to UHF (ultrahigh frequency). The tag structure has the advantages of UHF RFID function, tunable impedance, dual-frequency resonance, high gain and the like and comprises an antenna radiation body 1, a dielectric board 2 and a target chip 3. The antenna radiation body 1 comprises two dipoles close to each other and an n-type matching network. The chip with impedance varying from (5-j50) to (80-j400) is matched by regulating the height and width of the n-type matching network, so that the antenna radiation body is fine in conjugated matching in the range of UHF in China.

Description

technical field [0001] The invention relates to the field of radio frequency identification electronic tags, in particular to a broadband tag antenna with adjustable impedance applied in UHF frequency band. Background technique [0002] Radio Frequency Identification (RFID) is a technology that conducts non-contact two-way data communication through radio frequency to identify targets. The radio frequency identification system generally consists of a reader (Reader) and an electronic tag (Tag). The electronic tag is composed of an on-chip antenna and a chip, which exchanges data with the reader through electromagnetic waves, and has the functions of intelligent reading and writing and encrypted communication. The antenna is a crucial device in the RFID system. The RFID system transmits and receives electromagnetic waves through the radio frequency antenna, so as to realize the identification of the electronic tag by the reader. [0003] RFID systems mainly work in low freq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q1/36H01Q5/01H01Q1/22H01Q5/10
Inventor 李秀萍马雪丽
Owner BEIJING UNIV OF POSTS & TELECOMM
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