HIGH-FREQUENCY INTERFERENCE RESISTANT RF ANTENNA IMPEDANCE-MATCHING CIRCUIT AND DESIGN METHOD THEREOF

WIPO Patent Application WO/2017/016446

A1

Provided are a high-frequency interference resistant RF antenna impedance-matching circuit and design method thereof. The circuit comprises a first port A and a second port B respectively connected to an RFID module and an RF antenna. The first port A comprises a connection wire A+ and a connection wire A-. The second port B comprises a connection wire B+ and a connection wire B-. An inductor L is connected between the connection wire A+ and the connection wire B+. A capacitor C1 is connected between the connection wire B+ and a ground wire GND. Further, a capacitor C2 and an inductor L2 are connected in series between the connection wire B+ and the ground wire GND. An electric path between the connection wire A- and the connection wire B- and an electric path between the connection wire A+ and the connection wire B+ are symmetrical with respect to the ground wire GND. Dividing a matching capacitor of a traditional impedance-matching circuit into two capacitors C1 and C2 arranged in parallel and selecting proper capacitance values for the capacitors ensure matching performance of the circuit while suppressing a high-frequency spur at a specific frequency outside an operating frequency band, thereby improving wireless communication performance.

TU LICHENG (CN)
JIANG JINYANG (CN)
WU QINQIN (CN)

PCT/CN2016/090996

February 02, 2017

July 22, 2016

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FUJIAN LANDI COMMERCIAL EQUIP (CN)

H01Q23/00; H03H11/00

CN105071055A	2015-11-18
CN104662792A	2015-05-27
KR100879261B1	2009-01-16
CN103873008A	2014-06-18
CN103166656A	2013-06-19
CN1773877A	2006-05-17

BORSAM INTELLECTUAL PROPERTY (FUZHOU) (CN)

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