Matsushita Electric Industrial Co., Ltd.

Shinzo Koumoto

Koji Sako

Masahiro Ohara

Yusuke Ishito

Norihisa Nishida

Yasunori Kishimoto

Hiroaki Tsuda

Relating to an antenna device used in wireless unit for mobile communication or the like, it is an object to present an antenna device hardly causing uneven pitch or deformation of antenna elements, high in gain and reliability, excellent in productivity, and having two or more impedance characteristics, and a method of manufacturing the same. Both ends of plural bands ( ) are alternately connected consecutively, both ends of plural bands ( ) are alternately connected consecutively in a first antenna element ( ) made of a thin metal plate of nearly circular spiral form projecting alternately in the longitudinal direction, a second antenna element ( ) made of a thin metal plate formed by projecting in a nearly semicircular tubular form in the front direction is disposed at a nearly concentrical position, a mounting bracket ( ) is connected to one end of the first antenna element ( ), and the outer circumference of the members is covered with a cover ( ) made of an insulating resin, thereby composing an antenna device.

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Tsuyama, Japan

Shinzo Koumoto