Harada Industry Co., Ltd.

Ryuichi Taira

Yuji Maeda

Shigeru Uchino

Mikio Ueno

Shin Matsumoto

Moriyoshi Kawasaki

Shinji Ilno

Seiichi Wada

A low profile antenna device for use in a vehicle comprises a base unit, and an antenna unit. The antenna unit is supported on the base unit, and is provided with a first helical unit on the side near to the base unit, and a second helical unit on the side far from the base unit. The second helical unit is configured such that the surface area is larger per unit length than that of the first helical unit.

Antenna device

Provided is an in-vehicle patch antenna device which has a reduced size and multiple functions while improving performance. An in-vehicle patch antenna device includes a substrate (), a ground conductor () provided on the substrate (), an antenna element section () and a reporting circuit section (). The antenna element section () has a feeding section () and is provided on a surface of the substrate () opposite to a surface on which the ground conductor () is provided. The reporting circuit section () is provided on the substrate () and connected around an area in a periphery of the antenna element section () at which current distribution is minimal other than the peripheral area thereof where the feeding section () is provided.

Patch antenna device

A planar antenna device comprises a ground plane, a planar antenna element having a principal plane mounted above the ground plane, and a cavity, having an opening partially exposing the antenna element, placed on the ground plane in order to cover the entire antenna element contactlessly.

Planar antenna device

Growing community of inventors

Tokyo, Japan

Ryuichi Taira