Asymmetric feeding active leaky-wave antenna arrays

Abstract

The active leaky-wave antenna arrays have been demonstrated, which integrate several microstrip leaky-wave antenna elements with a single HEMT oscillator as an active source at 10.2 GHz. To excite the first higher order mode, the leaky-wave antenna is fed asymmetrically. The reflected wave due to the open end of each leaky-wave antenna element has been suppressed by the symmetric configuration of this antenna array. When comparing with the measured radiation pattern of the single-element antenna, we found that 1 x 2 and 1 x 4 antenna arrays can effectively suppress the reflected power by more than 5.5 and 10.5 dB, respectively. Furthermore, the power gains are more than 2 and 3.16 dB higher than the single-element antenna with a measured EIRP of 18.67 dBm. (C) 1998 John Wiley & Sons, Inc.