PURPOSE: To improve the isolation by placing a radio wave absorption body provided between a transmission antenna and a reception antenna between a radome and an antenna base.
CONSTITUTION: A radio wave absorbing body 7 is provided on an antenna base 1 between a transmission antenna 2 and a reception antenna 3. Part 14 of a radio wave 15 radiating from the antenna 2 is propagated toward the antenna 3 while being reflected between a radome 4 and the base 1 alternately. When the part 14 of the radio wave 15 is going to be made incident in the antenna 3, the strength of the radio wave is absorbed and attenuated by the absorbing body 7. Thus, the strength of the reflected radio wave 14 is attenuated and the isolation between the antennas 2, 3 is improved by the attenuation.
MIZUGAKI HISAYOSHI
KANEKO KAZUO
KADO SEIJI
| JP59125110B |