Inverted F-type antenna apparatus and portable radio communication apparatus provided with the inverted F-type antenna apparatus

摘要

PROBLEM TO BE SOLVED: To provide an inverted F antenna built in a foldable mobile radio communication apparatus, which can realize a broadband characteristic even when the frequency band of a radio wave in use is comparatively low and a grounding conductor does not contribute to excitation of the antenna. ;SOLUTION: The inverted F antenna 102 is provided with a grounding conductor 11 and an antenna element 12 arranged on the grounding conductor 11 so as to face the grounding conductor 11. The inverted F antenna 102 further includes at least one coupling element 13 provided between the grounding conductor 11 and the antenna element 12 so as to face the grounding conductor 11 and the antenna element 12, and a short-circuiting conductor 22 is provided for electrically connecting the antenna element 12 with the grounding conductor 11 and a feeder conductor 21 connects the antenna element 12 to a feed point 25 to which a feeder coaxial cable 30 is connected via the coupling element 13. Since the inverted F antenna 102 is provided with the coupling element 13, the antenna 102 can obtain a plurality of resonance frequencies so as to realize more broadband frequency characteristics.;COPYRIGHT: (C)2003,JPO