| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem wherein antenna performance deteriorates in a portable field radio due to electromagnetic interaction, if a hand of a user approaches a resonant element improving call performance. SOLUTION: The field radio comprises an upper cabinet 1, a lower cabinet, a hinge section 2 for connecting the upper cabinet 1 and the lower cabinet 2 in freely rotatable fashion, a circuit board 6 provided within the lower cabinet 2 for having a ground pattern, and an antenna element 7 arranged at the upper cabinet 1 side and received unbalance power supply in relation to the ground pattern. Extended elements 41, 42, 51, and 52 are arranged and separated from the circuit board 6 in a predetermined spacing along the longitudinal direction of the circuit board 6. Both ends of the extended elements 41, 42, 51, and 52 are electrically connected to the ground pattern. Resonant elements 43 and 53 for shutting off predetermined frequencies are placed at a position of substantially half of the extended elements 41, 42, 51, and 52. COPYRIGHT: (C)2006,JPO&NCIPI
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