Mitsubishi Electric Corporation

Makoto Matsuki

Masataka Otsuka

Kazunari Kihira

Hikaru Watanabe

Hiroki Iura

A sub-array number determinator is provided to determine a number of sub-arrays to be allocated to each of user terminals detected by a terminal position detector on a basis of relation between positions of the user terminals and a position of an antenna apparatus. An antenna selector selects sub-arrays for the number determined by the sub-array number determinator from among the sub-arrays and allocates the selected sub-arrays for the determined number to each of the user terminals. This structure is capable of preventing interference among beams for user terminals and providing excellent communication quality to the user terminals even in condition where the user terminals are adjacent to each other.

Antenna apparatus

Disclosed is an antenna device in which an excitation phase changing unit () for changing the excitation phases of element antennas (-) to (-) by controlling phase shifters (-) to (-) dependently on preset phase values is disposed, and every time the excitation phases are changed by the excitation phase changing unit (), a radiation pattern forming unit () shifts the phases of a sum signal and a difference signal, and forms a monopulse sum pattern by time-integrating the sum signal after phase shift and also forms a monopulse difference pattern by time-integrating the difference signal after phase shift.

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Tokyo, Japan

Makoto Matsuki