| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a defective case where the signals radiated from a transmitter antenna creeping to a receiver antenna to deteriorate the receiving performance by placing a cancel coil consisting of a loop antenna on the outer concentric axis of a transmitter antenna and winding the cancel coil in opposite winding direction to the receiver antenna. SOLUTION: A receiver antenna wire 52 serving as the coil end of a receiver antenna 15 is passed through a wire hole 63 of a flange 40a (corresponding to a transmitter antenna 13) of an antenna bobbin 40 and is wound in the opposite winding direction to the antenna 15, i.e., in the winding direction S4. The wire 52 is wound in piles and its coil end is passed through a wire hole 64 from the groove side to the outside of the flange 40a and then through a wire hole 66 from the groove side to the outside of a flange 40b. Thus, the creeping components of the signals radiated from the antenna 13 and observed at the antenna 15 can be completely eliminated. |
