| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem that, in a system such as a keyless entry system, asynchronous directionality in a front-back direction is sometimes required for an antenna, but it is difficult to arbitrarily control the directionality of an antenna in an induction field, and when a difference in reception sensitivity in a front-back direction is required for a bar antenna, the antenna need be surrounded by a shielding material, but it causes problems in terms of cost and shape. Ž<P>SOLUTION: A directional bar antenna comprises a plurality of bar antennae, each being such that a coil is wound around a core, wherein a first bar antenna and a second bar antenna are arranged in an inverted V shape with a third antenna therebetween. In the directional bar antenna, the coil is wound in the same direction in the first bar antenna and in the second bar antenna, but the coil is wound in the reverse direction in the third bar antenna. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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