Antenna device

Abstract

Abstract PURPOSE:To control the directivity with one loop antenna, by dividing a loop conductor into several parts at a fixed interval and connecting a switch, to which a feeder, resistance, and short-circuit conductor are connected under a switching possible condition, to each terminal. CONSTITUTION:A loop conductor 1 is divided into four loop conductor pieces 2, 3, 4, and 5 and switches S1, S2, S3, and S4 are installed to each terminal, respectively. A feeder, resistance R, and short-circuit conductor are connected to the contacts a1 and a1', b1 and b1', and c1 and c1' of the switch S1, respectively. The other switches S2, S3, and S4 are also constituted in the same way, but, when the terminal 11 is connected to the feeder, the switch S3 of the terminal 13 facing the terminal 11 is connected to the resistance and the switches of the other terminals 12 and 14 operate so that the terminals 12 and 14 are short-circuited. This relative relationship is maintained even when other terminals are connected with the feeder, and a condition, which is equal to the condition where an antenna constituted as a unilateral directive antenna by loading the resistance R onto a location facing the feeding terminal is rotated 90 deg. by 90 deg., is realized.

Inventors

• 👤 Kazutaka Hidaka
• 👤 一孝 日高

Bibliographic Details