| 摘要 |
PURPOSE:To eliminate the limitation of the installing position of an auxiliary antenna and the mechanical limitation such as mounting by arranging a microstrip antenna using a metallic part of a reflecting mirror as a ground conductor on the face of the reflecting mirror. CONSTITUTION:A metallic film 132 is adhered to the mirror face of a barrel 131 of a parabolic reflection mirror 13. Further, a throughhole 133 is formed at a part of the barrel part 131. Then a coaxial cable 15 is inserted to the throughhole 133, a core wire 151 of the cable 15 is connected to a radiation element 14 and an outer conductor 152 is connected to the metallic film 132. A transmission signal is fed to the core wire 151 of the coaxial cable 15 and the outer conductor 152 is connected to ground. Thus, the radiation element 14 is energized from the rear face of the reflection mirror through the coaxial cable 15. Since the mirror face of the parabolic reflecting mirror acts like a round conductor plate to the microstrip antenna, the directivity is not directed to the back side of the reflection mirror and the forward is covered almost uniformly.
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