Title :
A dual-beam asymmetrically scanning leaky-wave antenna by utilizing a HEMT resistive upconverter
Author :
Wang, Chien-Jen ; Sheu, Yu-Hau ; Jou, Christina F.
Author_Institution :
Dept. of Electr. Eng., Feng Chia Univ., Taichung, Taiwan
Abstract :
A dual-beam asymmetrical scanning microstrip leaky-wave antenna (LWA) has been demonstrated in this paper. A HEMT resistive upconverter output is connected to one terminal of the LWA, and a local oscillator (LO) signal is connected to the other terminal. In this experiment, we set the LO frequency at 9.5 GHz so that the right beam is fixed at 48/spl deg/. By changing the IF frequency from 0.7 GHz to 1.5 GHz, the module of the LWA can steer the left main beam of the far-field pattern from 136/spl deg/ to 158/spl deg/ (the total scanning angle of 22/spl deg/). Comparisons between the measured and theoretical results indicate that the design can achieve the asymmetrically scanning capability and agree well over the tuning bandwidth of 0.8 GHz.
Keywords :
active antennas; antenna feeds; antenna radiation patterns; beam steering; high electron mobility transistors; leaky wave antennas; microstrip antennas; microwave frequency convertors; scanning antennas; 9.5 GHz; HEMT resistive upconverter output; T-type power divider; X-band; beam steering; dual-beam asymmetrical microstrip antenna; far-field pattern; local oscillator signal; radiation patterns; scanning microstrip leaky-wave antenna; two-terminal antenna; two-terminal feeding structure; Antenna measurements; Circuit optimization; Frequency; HEMTs; Leaky wave antennas; Local oscillators; Microstrip antennas; Propagation constant; Switches; Tuning;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/7260.974556
