Automatic antenna matching tuner

Abstract

Abstract PURPOSE:To reduce the tuning time by applying DC drive to a motor driving a matching tuning circuit connected between a transmitter output and an antenna until the output is maximized and applying pulse drive to it after a maximum point is elapsed. CONSTITUTION:An automatic matching device is connected between a transmitter and an antenna. The automatic matching device consists of an output power (voltage) detector, a motor circuit control circuit, a motor M and an antenna matching device. The output power detector detects the direction of the motor M, that is, the direction where the output is increased by turning a matching variable capacitor VC and the motor control circuit drives the motor M continuously by DC. When the maximum output point is exceeded and the output starts decreasing, the motor M is stopped immediately, and the motor control circuit is activated so as to drive the motor M slowly step by step by means of a reverse pulse and this is continued up to the output maximum point. Thus, the circuit is matched automatically quickly.

Inventors

• 👤 Koji Akiyama
• 👤 秋山　好司

Bibliographic Details