| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a multiple frequency sleeve type micro-antenna which is integrated in information terminal equipment, such as a personal computer, PDA and the like, with wider bandwidth, and can perform high-sensitivity transmission/reception and further is configured simply. <P>SOLUTION: On the terminal lateral side of a high-frequency coaxial cable (1) including an inner conductor (1a); an insulator (1b) surrounding the inner conductor; an outer conductor (1c) formed around the insulator (1b) and a sheath (1d) covering the outer conductor (1c); a loop antenna unit which resonates at a first frequency, is formed on the distal end of the inner conductor (1a), at a portion where the insulator (1b) is exposed; a loop-like conductor plate (2) with a loop length (L1) is connected; and a cylindrical conductor (3) is connected to the outer conductor (1c), exposed on the lateral side of the high-frequency coaxial cable (1). In this case, the length (L) of a conductor unit, summing up the length (L2) of the loop-like conductor plate (2) in the direction of the cable and a length (L4) of the inner conductor (1a) and the cylindrical conductor (3) positioned in an exposed insulator portion (L3) is set as the length that resonates at a second frequency. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
