Title :
Electronically-controlled metamaterial-based transmission line as a continuous-scanning leaky-wave antenna
Author :
Lim, Sungjoon ; Caloz, Christophe ; Itoh, Tatsuo
Author_Institution :
Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA
Abstract :
An electronically-controlled metamaterial-based transmission line (TL) is demonstrated for the first time and applied to a continuous-scanning leaky-wave (LW) antenna. This transmission line is a composite right/left-handed (CRLH) microstrip structure incorporating varactor diodes for fixed-frequency voltage-controlled operation. The CRLH structure is rigorously analyzed in terms of the equivalent circuit models and dispersion diagrams. The TL behaviour is verified by way of its application as a LW antenna which is experimentally demonstrated. The antenna, operated at the fixed frequency of 3.1 GHz, exhibits the capability of continuous scanning from backward to forward angles over a range of 77° (from -41° to +36°), with efficient broadside radiation, by varying the varactors bias voltages from 15V to 0V (5V at broadside).
Keywords :
antenna radiation patterns; equivalent circuits; leaky wave antennas; microstrip antennas; transmission line theory; varactors; 0 to 15 V; 3.1 GHz; CRLH microstrip structure; broadside radiation; continuous-scanning leaky-wave antenna; dispersion diagrams; electronically-controlled transmission line; equivalent circuit models; fixed-frequency voltage-controlled operation; metamaterial-based transmission line; varactor diodes; varactors bias voltages; Capacitance; Equivalent circuits; Frequency; Inductance; Leaky wave antennas; P-i-n diodes; Switches; Transmission line theory; Varactors; Voltage;
Conference_Titel :
Microwave Symposium Digest, 2004 IEEE MTT-S International
Print_ISBN :
0-7803-8331-1
DOI :
10.1109/MWSYM.2004.1335880
