Matsushita Electric Industrial Co., Ltd.

Nobutaka Mochizuki

Kenichi Nishikawa

Kazuhiro Ikeda

Yu Hasegawa

Kenichi Satoh

Syuuichi Sugawara

A closed loop is formed by loop antenna elements which equivalently function as inductance, a capacitor inserted in such a manner as to divide the loop antenna into the loop antenna elements, and an impedance-matching dividing element for tuning the antenna and establishing matching with a high-frequency circuit side. A subsidiary substrate with the capacitor mounted thereon is fixedly installed by a retaining pawl of an antenna holder, and is connected to the loop antenna elements by being soldered thereto at a pair of lands on the subsidiary substrate. As a result, it is possible to improve the effective gain of the antenna and effectively utilize the substrate space.

Loop antenna and antenna holder therefor

A first loop antenna apparatus is disclosed which includes an open loop antenna portion and an inductor having a predetermined inductance and first and second ends connected to first and second intermediate points of the open loop antenna portion. The inductance of the first loop antenna apparatus is decreased because the inductor is connected in parallel, so that an opening area (antenna gain) is increased at the same resonant condition. A second loop antenna apparatus is also disclosed which includes an open loop antenna portion, a first inductor having a predetermined inductance, one end of the first inductor being connected to first intermediate point of the open loop antenna portion, a second inductor having the predetermined inductance, one end of the second inductor being connected to a second intermediate point of the open loop antenna portion, and a capacitor having a predetermined capacitance, connected the other ends of the first and second inductors. Similarly, the inductance of the second loop antenna apparatus is decreased because the inductors and the capacitor is connected in parallel, so that an opening area (antenna gain) is increased at the same resonant condition.

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Shizuoka, Japan

Nobutaka Mochizuki