| 摘要 |
PURPOSE:To obtain a two-frequency shared antenna which is excellent in radiation efficiency, by using a planar reflection mirror having an FSS characteristic as an auxiliary reflection mirror and providing the planar reflection mirror between the reflecting surface and focal point of a main reflection mirror under a state where the reflecting surface of the auxiliary mirror is faced to that of the main mirror. CONSTITUTION:Radio waves radiated from the 1st first-order radiator 3 at the focal point F0 of a main reflection mirror 1 are reflected by the reflecting surface 11 of the main mirror 1 after passing through an auxiliary reflection mirror 2 having an FSS characteristic and sent in parallel in the forward direction, because frequencies of the radio waves are those f1 other than a specific frequency f0. Frequencies of the radio waves radiated from the 2nd first-order radiator 4 are the specific frequency f0 and the radiator 4 is provided in such a way that its radiant 41 is set to a location F1 which is symmetrical to the focal point F0 with respect to the auxiliary reflection mirror 2. Therefore, radio waves radiated from the first-order radiator 4 are reflected by the reflecting surface of the main reflection mirror 1 after they are reflected by the reflecting surface of the auxiliary mirror 2 and sent in the forward direction fro the reflection mirror 11.
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