Active asymmetrically feeding dual-beam leaky-wave antenna

An active-integrated dual-beam scanning leaky-wave antenna design is developed in this paper. A varactor-tuned HEMT VCO as an active source, integrates with an X-band two-terminal asymmetrically feeding microstrip leaky-wave antenna on the same plane. This approach creates a dual-beam radiation pattern and has the advantages of multi-direction and no reflected wave caused by the open end of the radiating element, as compared to a traditionally single-terminal feeding leaky-wave antenna. Measured results on the experimental antenna show that the total scanning angle of two beams of this antenna configuration is approximately 44/spl deg/. The maximum Effective Isotropic Radiated Power (EIRP) are close to 17.5 dBm for the right beam and 16.67 dBm for the left beam at 10.4-GHz, and the power difference between the two beams is less than 1 dB.