| 摘要 |
A miniature antenna is mounted on a casing of a radio communication equipment such as a portable transmitter/receiver, a pocket telephone, or a mobile telephone of low power type. The miniature antenna is includes a semi-coaxial dielectric resonator and a radiator. The semi-coaxial dielectric resonator has a metal case, a center conductor surrounded by the metal case, and a dielectric material filled between the metal case and the center conductor. The radiator is formed by extending the center conductor approximately the same length as the center conductor and projected from the metal case without contacting the case. A skirt member can be added outside of the semi-coaxial dielectric resonator. According to the above-described structure, the directivity becomes maximum in a horizontal plane and an effect caused by holding the casing with a human hand is decreased.
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