| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an antenna device and a radio device which can suppress deterioration of antenna performance due to ambient environmental change. <P>SOLUTION: The antenna device includes a first antenna and a second antenna. The first antenna includes a grounding conductor plate, and a first radiation conductor having a symmetrical shape with respect to a virtual plane orthogonal to the grounding conductor plate, and having a first feeding part in which a first high frequency signal is supplied onto an intersection of the grounding conductor plate and the virtual plane. The second antenna includes: a pair of second radiation conductors which are disposed at positions being symmetrical with respect to the virtual plane, and have mutually symmetrical shapes; a pair of transmission lines which have substantially same electric length, and have their respective one ends connected to mutually symmetrical positions on the pair of second radiation conductors; and a second feeding part for supplying a second high frequency signal to their respective other ends of the pair of transmission lines. <P>COPYRIGHT: (C)2013,JPO&INPIT |
