To realize an active antenna system configured by integrating element antennas and semiconductor devices where higher harmonics in transmission are less affected and less interference from others in the case of reception is caused.
The active antenna system is formed on a dielectric board to form antenna elements or an antenna array of 2-dimension structure and provided with a microwave integrated circuit 3 that is mounted on the board. In this case, a band limit filter circuit 17 is formed on a side of the dielectric board, and a circuit consisting of at least either of an amplifier and a phase shifter is provided to the microwave integrated circuit 3 for two systems; transmission and reception uses. Furthermore, the microwave integrated circuit 3 is provided with a changeover circuit that selects the connection to either of the two systems, and the system is configured by connecting the antenna elements or the antenna array to the changeover circuit of the microwave integrated circuit 3 via a band limit filter circuit 17 electrically or electromagnetically.
UEHARA KAZUHIRO
KAGOSHIMA KENICHI
NAKATSUGAWA SEIJI
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