PURPOSE: To realize an active plane antenna at a low cost with a small height and a low NF in which reduction in a signal level between a high frequency amplifier and an antenna conductor is small by forming a signal line conductor tying a plane antenna conductor and the high frequency amplifier to be an integrated and continuous conductor with the plane antenna conductor.
CONSTITUTION: A plane antenna conductor ANT and separate conductors 5-15 for interconnecting amplifier circuit elements are connected to the surface of a dielectric board 1, plural electric circuit elements (FET, BPF or the like) are connected to the separate conductors 5-15 to form a high frequency amplifier 20, then the plane antenna conductor ANT and the high frequency amplifier 20 are formed on the same plane of the dielectric board 1. Then coplanar lines (17;16,21,22) interconnect the plane antenna conductor ANT with the high frequency amplifier circuit 20, and the coplanar line 17 is also on the same plane as the plane antenna conductor ANT and the high frequency amplifier 20. That is, the signal line conductor 16 tying the plane antenna conductor ANT and the high frequency amplifier 20 is integrated and continuous with the plane antenna conductor ANT.
MURAKAMI YUICHI
YASUDA TOMIO
SUGIURA HIROTANE
