Title :
A novel variable-impedance microstrip circuit and its application to direct antenna modulation
Author :
Son, Chang-Sin ; Park, Jun-Seok ; Cho, Hong-Goo ; Lim, Jae-Bong
Author_Institution :
Sch. of Electr. Eng., Kookmin Univ., Seoul
Abstract :
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 2.45 GHz and a 30 MHz bandwidth can transmit a 1 Mbps digital modulated signal with the ultra low-power consumption
Keywords :
amplitude shift keying; high-frequency transmission lines; microstrip antennas; microstrip circuits; radiofrequency identification; varactors; 2.45 GHz; 30 MHz; ASK modulation; RFID applications; direct antenna modulation; patch antenna; planar antenna; resonant frequency; varactor diode; variable-impedance microstrip circuit; variable-impedance transmission line; Amplitude shift keying; Diodes; Distributed parameter circuits; Impedance; Microstrip antennas; Planar arrays; Planar transmission lines; Resonant frequency; Transmission line antennas; Varactors;
Conference_Titel :
Wireless Technology, 2005. The European Conference on
Conference_Location :
Paris
Print_ISBN :
2-9600551-1-X
DOI :
10.1109/ECWT.2005.1617742
