| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna module for improving transmission and reception gain and directivity with the realization of miniaturization and thinness as it is without damaging the external appearance and usability of electronic equipment. SOLUTION: This antenna module 6 has a base body, a pair of terminal parts 4 and 5 provided in the base body, a helical antenna 1 having a helical part provided in the base body, a power feeding part 7 for feeding power to one of the pair of terminal parts 4 and 5 provided in the helical antenna 1, an opened part to be connected to the other of the pair of terminal parts provided in the helical antenna 1, an antenna base 9 in which the helical antenna 1 is mounted, a ground area 10 provided in close proximity to the power feeding part 7, and a circumferential conductor part 16 formed on at least one portion of the circumference of the antenna base 9. The circumferential length of the circumferential conductor part 16 formed around the antenna base 9 is almost an integer multiple of 1/4 wavelength of a resonance frequency. COPYRIGHT: (C)2005,JPO&NCIPI
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