DUAL RESONANCE ANTENNA APPARATUS

摘要

A dual resonance antenna apparatus includes an antenna element (22) and an LC parallel resonance circuit (31) for resonating the antenna element (22) in a plurality of frequency bands. The LC parallel resonance circuit (31) has a T-shaped circuit or a pi-shaped circuit consisting of an inductance element (26) which is a shunt element for preventing the impedance from becoming infinitely great in a predetermined frequency band and capacitance elements (29, 30). This can eliminate a drop-in point in the frequency characteristic, i.e., notch causing deterioration of a gain.