| 摘要 |
PURPOSE:To improve the side rope characteristic of an antenna by providing a first radiator to radiate first electromagnetic wave and a second radiator to radiate a second electromagnetic wave and using an electromagnetic wave transmitting reflector having two areas to transmit and reflect respectively two electromagnetic waves. CONSTITUTION:The first electromagnetic wave, namely, an unnecessary wave of the range which can be radiated from a primary radiator 11 and cannot be reflected by a sub-reflection mirror 14 and a main reflection mirror 15, is reflected by a second area 131 of an electromagnetic reflector 13 radiated in the direction and opposite to a main beam. The second electromagnetic wave, which is radiated from a primary radiator 12 and comes to be a unnecessary wave, is transmitted by the second area 131 of the electromagnetic wave transmitting reflector 13 and radiated in the direction opposite to a main beam. Thus, for the first and second electromagnetic waves radiated from primary radiators 11 and 12, only the electromagnetic wave to constitute the main beam is radiated in the direction of the purpose, and the unnecessary wave is radiated in the direction reverse to the main. For this reason, the beam characteristic near the main beam, especially, the side rope characteristic is not worsened.
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