Matsushita Electric Industrial Co., Ltd.

Tomoyuki Maeda

Koichi Ogawa

Susumu Inatsugu

Hirotaka Ishihara

Atsushi Yamamoto

The antenna of the present invention comprises flat-plate conductive ground plane, first antenna elementwith one endconnected to feeding pointand intermediate portionfolded by a plurality of times, which is extended upward from the ground plane, and second antenna elementwith one endconnected to the other endof the first antenna element, with intermediate portionformed in symmetrical relation to the first antenna element, and also, with the other endconnected to the ground plane. Thus, it is possible to obtain a small size antenna with the antenna element lowered in height.

Antenna

A top-loading monopole antenna apparatus having a feeding point is provided for use in a communication system such as a mobile communication system or the like. The top-loading monopole antenna apparatus includes a grounding conductor, a top-loading electrode, a linear conductor element, and a short-circuit conductor. The grounding conductor is provided so as to oppose the grounding conductor. The linear conductor element electrically connects the feeding point with the top-loading electrode, and the short-circuit conductor electrically connects the top-loading electrode through a reactive element. This antenna structure leads to a height which is lower than that of prior art, and easy impedance matching.

Growing community of inventors

Hyogo, Japan

Tomoyuki Maeda