Active feedback microstrip leaky wave antenna-synthesiser design with suppressed back lobe radiation

The design of an active leaky-wave antenna which integrates the antenna wit h a feedback synthesiser is introduced. The measurement result shows that t he antenna has very low back lobe radiation compared with that of tradition al single-terminal feeding leaky-wave antennas. Single frequency measuremen t shows that the radiated power differmce between the main beam and back lo be is >15 dB at 8.2 GHz For the designed feedback synthesiser antenna, the measured radiated power difference between the main beam and back lobe is > 15dB at 9.25 GHz, and the scanning angle is similar to 5 degrees as the syn thesiser frequency sweeps from 9.25 to 9.37 GHz.