Active antenna system

Abstract

Abstract PURPOSE:To reduce the number of cables between an antenna and tuner by selectively passing the output received signal of an active circuit and by applying it to the input terminal of a separating method for an electric power voltage and antenna switching control signal. CONSTITUTION:At separating circuit 8, electric power voltage +B which is the transmission output of the transmission line and an antenna switching control signal are separated. On the other hand, change-over circuit 12 provided which selects and inputs received signals of two antennas 9 and 10 to active circuit 11. Then, this switching control is exercised by the precedent control signal. By way of high- pass filter 13 that permits the received signals to pass through it, the output of active circuit 11 is connected to the input terminal of separating circuit 8 in common.

Inventors

• 👤 Katsuaki Kawamura

Bibliographic Details