| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a nondirectional antenna for narrow beam and high gain over a wide frequency band, with a cyclic structure and less number of excitation elements. <P>SOLUTION: The nondirectional antenna includes at least one excitation element, and a cyclic structure which encloses the at least one excitation element. The cyclic structure has a plurality of conductor patterns arranged in matrix in a developed state. The cyclic structure has a circular cross section being cut in the extension direction of the cyclic structure, and the conductor pattern of the cyclic structure is square. The excitation element is a half-wave dipole element. <P>COPYRIGHT: (C)2013,JPO&INPIT |
