Title: An asymmetric feeding X-band active frequency-scanning leaky-wave antenna
Authors: Hu, CC
Wu, JJ
Jou, CF
National Chiao Tung University
Institute of Communication Studies
Keywords: asymmetric feeding;leaky-wave antenna;frequency scanning;varactor-tuned VCO
Issue Date: 1-Sep-1997
Abstract: An asymmetric feeding X-band active leaky-wave antennas is developed, to excite the first high order mode of the microstrip leaky wave antenna. One is the asymmetric feeding leaky-wave antenna which integrated with a HEMT oscillator, and the other is the frequency-tuned leaky-wave antenna which integrated with a varactor-tuned HEMT VCO. The microstrip leaky-wave antenna is operated in the first higher mode. To excite the first higher mode, the microstrip leaky-wave antenna is fed asymmetrically. The dominant mode excitation has been successfully suppressed by adding a sequence of covered wire in the center of the microstrip leaky wave antenna. The design of these active leaky-wave antennas is discussed and the beam scanning phenomena of the antenna is presented. The HEMT oscillator frequency is controlled by tuning the varactor DC bias and the beam scanning is demonstrated. The measured scanning angle agree with prediction, it is close to 30 degrees as the VCO frequency tuned from 8.06 GHz to 9GHz.
URI: http://hdl.handle.net/11536/356
ISSN: 0195-9271
Volume: 18
Issue: 9
Begin Page: 1843
End Page: 1856
Appears in Collections:Articles