Active endfire antenna elements and power combiners using notch antennas

A Gunn device integrated with a planar, endfire notch antenna is described. A simple transmission-line model, has been developed to optimize the passive and active circuit parameters. An electronic tuning bandwidth of 275 MHz centered at 9.33 GHz with a maximum power output of 37.5 mW was accomplished. Two active notches in a broadside array configuration were injection-locked at 9.484 GHz with a 30-MHz locking bandwidth and well over 90% power combining efficiency.<>