MULTI-FREQUENCY ANTENNA AND DIVERSITY ANTENNA CONSTITUTED THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a multi-frequency antenna that can be housed in the enclosure of radio equipment so as to improve the portability and operability of the antenna, is not deteriorated in antenna gain even when the antenna is brought nearer to the head of a person, is wide in band width, and can cover a plurality of frequency bands. SOLUTION: This multi-frequency antenna is provided with plate-shaped antenna elements 3a and 3b which are fitted to a plurality of surfaces of a polyhedron cubic molded resin 10 mounted on the radio equipment substrate 1 of portable radio equipment and having a specific dielectric constant and divided by a reactance component 20. Consequently, the frequency band of each antenna element becomes wider and the antenna can resonate in a plurality of frequency bands. In addition, the gain of the antenna can be improved at talking time by enlarging crossing polarized components in a free space.