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A novel variable-impedance microstrip circuit and its application to direct antenna modulation

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4 Author(s)
Chang-Sin Son ; Sch. of Electr. Eng., Kookmin Univ., Seoul, South Korea ; Jun-Seok Park ; Hong-Goo Cho ; Lim, Jae-Bong

In this paper, we proposed a variable-impedance microstrip circuit using varactor diode as a control device. The proposed variable-impedance transmission line with a simple planar antenna can change the resonant frequency and the input impedance of antenna to achieve the DAM (Direct Antenna Modulation). As an application of the variable-impedance microstrip circuit, we have implemented the ASK modulation of RF signal for the low-power consumption RFID applications. The experimental results show that a patch antenna with a resonant frequency of 2.45GHz and a 30MHz bandwidth can transmit a 1Mbps digital modulated signal with the ultra low-power consumption.

Published in:

Microwave Conference, 2005 European  (Volume:3 )

Date of Conference:

4-6 Oct. 2005