Matsushita Electric Works, Ltd.

Masakatsu Niwa

Katsuya Tsukamoto

Masayuki Matsuo

Yasuhiro Fujii

Yoshihiro Kitsuda

Kyoji Masamoto

Yasumasa Ogawa

Hiroshi Yokota

Hajime Takeda

Sadaaki Kondo

Shuji Taniguchi

Shoji Miyanari

A plane antenna comprises a power-supply circuit, a radiator circuit and an earthing conductor which are stacked respectively with a dielectric layer interposed between them, in which the power-supply and radiator circuits are made independent of each other as electromagnetically coupled to each other and at least one of the dielectric layers is formed with a foamed resin, whereby insertion loss can be reduced to remarkably improve the antenna characteristics. Only with the interposition of the foamed resin dielectric layer or layers, an effective separation is achieved between at least the power-supply circuit and the earthing conductor or the power-supply circuit and the radiator circuit, for a large extent improvement in the assembling ability.

Planar antenna

Growing community of inventors

Kadoma, Japan

Masakatsu Niwa