ANTENNA AND WIRELESS COMMUNICATION MACHINE

摘要

Provided are an antenna and a wireless communication machine wherein a multi-resonance in desired bands, such as UHF bands, can be achieved with the antenna size reduced and without degradation of the antenna gain and further wider bands of resonant frequencies can be obtained. An antenna (1-1), which is formed in a non-ground area (101) of a board (100), comprises two antenna parts (A1, A2). The antenna part (A1), which resonates at a resonant frequency (f1), comprises a frequency-variable circuit (3-1), a radiation electrode (4) and a loop-shaped radiation electrode (5). The antenna part (A2), which resonates at a resonant frequency (f2), comprises the radiation electrode (4), a frequency-variable circuit (3-2), a radiation electrode (6) and the radiation electrode (5). An end portion (61) of the radiation electrode (6) is closely opposed to a midway portion (52) of the radiation electrode (5) via a gap (G2). The radiation electrode (6) is capacitively coupled to the midway portion (52) of the radiation electrode (5) through a capacitance (C2) occurring between the end portion (61) and the midway portion (52).