| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna maintaining superior radio communication performance without being greatly affected by an electric conductor existing near the antenna. SOLUTION: An antenna plate 3 and a conductive outer plate 15 which are arranged opposite to each other across an interval are connected together by a metal wall 20, thereby a U-shaped cross-sectional shape having a gap part inside is formed, and a frequency adjustment member 36 for adjusting a resonance frequency of the antenna 30 is arranged near the end of an U-shaped opening. As a result, even though the electric conductor comes close to the vicinity of the antenna 30, the resonance path of the antenna 30 is little affected by the electric conductor and superior radio communication performance can be maintained. COPYRIGHT: (C)2011,JPO&INPIT
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