| 摘要 |
A multi-resonant antenna device of the present invention contains an antenna element 22 and an LC parallel resonance circuit 31 making the antenna element 22 resonate in a plurality of frequency bands, and the LC parallel resonance circuit 31 contains a T-type circuit or PI-type circuit composed of an inductance element 26, acting as a shunt element, and capacitance elements 29 and 30, which prevents the impedance from becoming infinite in a certain frequency band. In this way, a drop, that is, a notch portion, in the frequency characteristic causing deterioration of the gain can be eliminated.
|
