Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Denki Kabushiki Denki

Kuniaki Shiramatsu

Tetsuo Haruyama

Shigeo Udagawa

Takashi Katagi

Nobutake Orime

Ryuji Ishii

Yukihir0 Yoshikawa

An array antenna system having a predetermined electric current distribution on an antenna aperture to form a desired shape of antenna beam. Active antenna elements arranged on the aperture transmit a signal for electronically scanning a predetermined region to detect a target and receive a signal reflected by the target. Passive antenna elements are also arranged on the aperture. The antenna system further includes a direction finding section including reception antenna elements which receive an incident signal. The active, passive and reception antenna elements are positioned to allow a predetermine electric current distribution to be established on the antenna aperture.

Array antenna system with direction finding capability

A phased array antenna includes a plurality of first antenna elements and a plurality of phase shifters respectively connected to the first antenna elements. An amplitude and a phase of each of the antenna elements are determined by a method of opposing a pick-up antenna at a distance from the phased array antenna to measure a composite power of the phased array antenna while changing phases of the phase shifters for determining the ratio of the maximum power to the minimum power, and the phase value for the maximum power, from which the amplitude and phase are computed. A second antenna element is incorporated in the phased array antenna as a pick-up antenna to measure with mutual coupling an amplitude and a phase of each antenna element by the method and to determine differences in amplitude and phase between the opposed pick-up antenna and the second antenna element so that an amplitude and a phase subsequently measured with the second antenna element are corrected with the differences in amplitude and phase to determine an amplitude and a phase of each antenna element.

Antenna system

A microstrip antenna offering a wide bandwidth while suppressing the standing wave ratio is obtained by interposing a conductor plate between a radiating conductor element and a ground plane conductor.

Microstrip antenna

Growing community of inventors

Kanagawa, Japan

Kuniaki Shiramatsu