Nippon Steel Corporation

Hitachi Chemical Company, Ltd.

Nippon Hoso' Kyokai

Nemoto Project Industry Co., Ltd.

Kenji Ohmaru

Yasuhiro Ito

Kazuo Kaneko

Shigeru Yamazaki

Masahiro Uematsu

Hiroyuki Iyama

Hironori Ishizaka

Masahiko Ohta

Ryuichi Hiratsuka

Kazuro Kato

Isao Nemoto

Tetsumi Harakawa

Mitisuru Hirao

Takao Murata

Seizi Kado

A stripline patch antenna having a slot plate which is capable of obtaining higher antenna gain, while reducing the loss due to the feed lines. The antenna includes at least one radiating element for transmitting and receiving radio waves; a feed line for transmitting signals to and from the radiating element; a dielectric substrate for supporting the radiating element means and the feed line means; a grounding conductor located below the dielectric substrate; and a slot plate located above the dielectric substrate, having a plurality of slots more numerous than the radiating element. The triplate substrate can be adapted to this antenna. A plurality of antenna units so constructed can be arranged in array such that at least one of the slots of each antenna unit is shared with a neighboring antenna unit.

Stripline patch antenna with slot plate

Attitude control is implemented by detecting the phase difference between signals received by at least two antennas and detecting the angle of deflection between the direction of arrival of radio signals and the antenna beams. By using antennas that are separately driven, within the plane of rotation in which the deflection angle is to be detected, the phase of the received signals can be shifted equivalently to when the antennas are driven as a consolidated unit. Also, when at least three antennas are used in an orthogonal arrangement for detecting the deflection angle in two directions, the antennas are divided into two groups which are individually driven. This reduces the inertia of the moving parts and enables the size and weight of the drive mechanisms to be reduced. In addition, two orthogonal functions are used to represent the phase of the deflection angle of the direction of arrival of the radio wave and the antenna beam as a multiplicity of quadrants, and by storing these, when there is a change in the deflection angle, the sequence of change can be traced back and the control effected accordingly. This enables error to be eliminated.

Antenna apparatus and attitude control method

Growing community of inventors

Tokyo, Japan

Kenji Ohmaru