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

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 Modulati...

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Bibliographic Details
Main Authors: Chang-Sin Son, Jun-Seok Park, Hong-Goo Cho, Jae-Bong Lim
Format: Conference Proceeding
Language:English
Subjects:
Amplitude shift keying
Diodes
Distributed parameter circuits
Impedance
Microstrip antennas
Planar arrays
Planar transmission lines
Resonant frequency
Transmission line antennas
Varactors
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Summary: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.
DOI:10.1109/EUMC.2005.1610311