Patent ID: 6563236
Filing Date: 2003-05-13
Classification: H04B

Abstract:
A feed line switching circuit for switching feeding by feed current control between feeding across a first feed line and a second feed line and feeding across the first feed line and a third feed line, said feed line switching circuit comprising:a relay that is connected between said first feed line and said second feed line, and operates in response to a feed current flowing through said relay; a first contact of said relay that closes when said relay is unenergized and opens when said relay is energized; and a resistor that constitutes a series circuit with said first contact, which series circuit is connected in parallel with said relay, wherein a resistance r of said relay and a resistance R of said resistor are set to satisfy a relationship of (R/(r+R))Ã—Iawhere Ia is a current value flowing through said second feed line immediately before operation of said relay, and Ib is a current value flowing through said second feed line immediately after the operation of said relay.