Matsushita Electric Industrial Co., Ltd.

Yusuke Ishito

Koji Sako

Masahiro Ohara

Yoshinobu Nakagawa

Susumu Inatsugu

Kazuji Ota

Shinzo Koumoto

Hiroaki Tsuda

Norihisa Nishida

Yasunori Kishimoto

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.

Antenna device and method for manufacturing the same

Preparations of piece parts used in coupling a joint and a feeding fixture together and the assembly work involved are made easy and a less expensive antenna can be realized. The antenna disclosed here includes a case of a wireless device, a holder mounted on the case, a first antenna element accommodated in the holder so as to be freely movable by sliding, a stopper coupled with one end of the first antenna element and connected electrically to the holder by sliding, a cylindrical column like joint formed of an insulating resin and fixed to the other end of the first antenna element, a tubular feeding fixture formed of a metal, electrically connected with the holder by sliding and put in place sheathing the joint, and a second antenna element electrically connected to one end of the feeding fixture. The feeding fixture has a pressing process applied portion formed by applying an inward pressing onto the peripheral thereof and the feeding fixture and the joint are coupled with each other at the pressing process applied portion. The manufacturing method of the antenna has the steps of putting in place the feeding fixture that sheathes the joint and applying an inward pressing process to the periphery of the feeding fixture, thereby coupling the joint and the feeding fixture together.

Antenna and its manufacturing method

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Okayama, Japan

Yusuke Ishito