Ntt Mobile Communications Network, Inc.

Nihon Dengyo Kosaku Co., Ltd.

Yoshio Ebine

Ryo Yamaguchi

Hiroshi Suzuki

Tohru Matsuoka

Makoto Kijima

Minoru Kuramoto

Masahiro Karikomi

Manabu Nakada

Yoshihide Yamada

Kazuhito Ito

The outputs of antenna elements to of a wide directional pattern are distributed by a distributor to respective channel parts to , and in each channel part (i&equals;1, 2, . . . , N), its connection points to to the distributor are divided in groups of P&equals;4; four connecting ends of the respective groups are connected via level-phase regulators to to combiners to (L&equals;M/P), then the combined outputs therefrom are applied to receivers to , and the outputs therefrom are combined after being applied to regulators to which are adaptively controlled. In the channel part , coefficients W to W are set in regulators to to obtain a subarray directional pattern and a combined directional pattern is controlled within the range of the subarray directional pattern, and in another channel part coefficients W to W are set in the regulators to to obtain a subarray directional pattern ; by setting the regulators to of each channel part, a wide area is covered as a whole.

Adaptive array antenna

Booster system

Input is applied to a two-partition circuit that substantially equally distributes input power into two partitions having a phase difference of 90.degree., and the thus-distributed output is applied to a first driver that generates circularly polarized wave. The two outputs of the second driver, in which the circularly polarized waves generated from the first driver are coupled, are combined in a combining circuit. The end portion of the opening of the sealed case incorporating the first driver fits together with the end portion of the opening of the sealed case incorporating the second driver such that the two sealed cases together with the first and second drivers may rotate relative to each other around their cylindrical axis. The phase difference between the input of the two-partition circuit and the output of the combining circuit changes according to the relative angle of rotation around the cylindrical axis between first and second drivers.

Phase shifting device with rotatable cylindrical case having driver

Two beams with equiangular spacing are formed at a single antenna face, and multiple beams are generated by combining a plurality of such faces. This makes it possible to reduce the size of an antenna device and to decrease the wind load sustained by an antenna, whereby it becomes possible to mount many antennas on a single supporting structure and to achieve substantial weight reduction of a supporting structure.

Multibeam antenna devices

Growing community of inventors

Yokohama, Japan

Yoshio Ebine