Long-reading-distance RFID (Radio Frequency Identification) tag antenna easy for impedance matching
An RFID tag and impedance matching technology, applied in the field of long-reading distance RFID tag antenna, to achieve the effect of small size, simple implementation method, and easy matching
Inactive Publication Date: 2015-01-28
ZHEJIANG UNIV
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Problems solved by technology
[0004]Because most of the chip impedances used in passive tag antennas exhibit low resistance and high reactance, such high Q impedance values make it difficult to match the antenna and chip
Existing tag antennas are mainly matched by T-match, inductive coupling loop or nested-slot and other technologies, but T-match and inductive coupling loop are mostly used for linear antennas, while nested-slot is suitable for planar dipole or patch Antenna, the process of impedance adjustment is more difficult
Method used
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[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0021] like figure 1 , 2 As shown, the present invention is an RFID tag antenna that is easy to match impedance, including FR4 substrate 9, copper patch 1 and tag chip (microchip) 5; wherein, the FR4 substrate 9 is rectangular, and copper patch 1 is printed on its upper part ; A left semicircular groove 2 and a right semicircular groove 3 are symmetrically opened on both sides of the central axis of the copper patch 1; a thin groove 4 communicates between the left semicircular groove 2 and the right semicircular groove 3, and the thin groove 4 will The metal strip between the left semicircular groove 2 and the right semicircular groove 3 is equally divided into an upper metal strip 6 and a lower metal strip 7 of equal length; the upper metal strip 6 and the lower metal strip 7 are connected through the label chip 5; A C-shaped groo...
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The invention discloses a long-reading-distance RFID (Radio Frequency Identification) tag antenna easy for impedance matching. The RFID tag antenna comprises an FR4 base, a copper chip and a tag chip, wherein the FR4 base is rectangular, and the upper part of the base is printed with the copper chip; a left semicircular slot and a right semicircular slot are symmetrically formed in the two sides of the central axis of the copper chip and are communicated by a fine slot; a metal strap between the left semicircular slot and the right semicircular slot is equally divided into an upper metal strap and a lower metal strap with equal length by the fine slot; the upper metal strap is communicated with the lower metal strap through the tag chip; a C-shaped slot is formed below the left semicircular slot and the right semicircular slot and is fine in the middle and wide on the two ends. The antenna has wider impedance bandwidth, and the 6dB echo loss can completely cover an American band; the antenna has a bidirectional radiation directional diagram and extremely low cross polarization; the reading distance is long, the maximum reading distance of calculation can reach over 14.5 m, and the maximum reading distance is also over 12 m in the entire American band.
Description
technical field [0001] The invention belongs to the field of antenna technology and wireless communication, and relates to an RFID tag antenna with a long reading distance and easy impedance matching. Background technique [0002] Radio Frequency Identification (RFID) technology is a non-contact communication technology that can identify specific targets and read and write data through wireless communication. The widely used UHF RFID frequency band standards in the world include Chinese standards (840-844.5MHz and 920.5-924.5MHz), American standards (902-928MHz) and European standards (866-869MHz). [0003] The RFID tag antenna is an important part of the RFID system, and its performance will directly affect the efficiency and quality of the entire RFID system. The main factors affecting the RFID tag antenna include the size of the antenna, operating frequency band, impedance matching, gain and its application environment. [0004] Since the impedance of the chip used in ...
Claims
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IPC IPC(8): H01Q1/38H01Q1/50
Inventor 陈浙锋何赛灵徐博
Owner ZHEJIANG UNIV