Patent ID: 8134495

Claim:
A transmitter apparatus comprising a first array antenna, comprising a first plurality of antenna elements arrayed with a fixed pitch, RF pulse signal supplying circuitry configured to supply a RF pulse signal as a plurality of individual transmission signals to respective ones of said first plurality of antenna elements, said RF pulse signal alternating between a pulse-on condition of large amplitude and a pulse-off condition of small amplitude, transmission-side phase adjustment circuitry controlled for adjusting a phase distribution of said individual transmission signals, and transmission direction control circuitry configured to control said transmission-side phase adjustment circuitry during said pulse-on condition for establishing a first phase distribution of said individual transmission signals and thereby transmitting said RF pulse signal as electromagnetic waves from said antenna in a predetermined direction; wherein said transmitter apparatus comprises transmission-side phase alteration circuitry configured to control said transmission-side phase adjustment circuitry during said pulse-off condition for establishing a second phase distribution of said individual transmission signals, said second phase distribution being different from said first phase distribution.