Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Nobuyasu Takemura

Yoshihiko Konishi

Masataka Ohtsuka

Hiroaki Miyashita

Kazushi Nishizawa

Izuru Naitou

Yoshihiko Imai

A ground conductor constituting a bottom board and a loop antenna formed of a strip conductor formed separately from and around the ground conductor are provided on one face of a dielectric substrate, and a transmitter-receiver is connected to one end of the loop antenna serving as the power dispatching unit via a first matching circuit, and a second matching circuit is connected to the other end. A conductor formed of the strip conductor is provided on the dielectric substrate on the other face of the dielectric substrate so as to oppose the loop antenna with the intermediary of the dielectric substrate. A third matching circuit is connected to one end of the conductor and a fourth matching circuit is connected to the other end of the conductor. The loop antenna and the conductor are set to have a wavelength shorter than that of the frequency band to be used.

Antenna apparatus

A variable power distributor capable of calculating an error between transmission lines of two systems after building a variable power distributor and correcting the set value of the amplitude and the phase according to the error, an error detection method for the variable power distributor, and a set value correction method is provided. The variable power distributor includes: a two-way distributor provided on an input side of a set of transmission lines consisting of a first and a second transmission line; a 90-degree hybrid circuit provided on an output side of the set of transmission lines; and a variable phase shifter, variable resistance attenuator, and a power amplifier provided on each line of the set of transmission lines between the two-way distributor and the 90-degree hybrid circuit. The variable power distributor further includes an error detection unit that monitors an output signal from the 90-degree hybrid circuit and detects an error existing in each component between the first and the second transmission lines based on the monitor output.

Variable power distributor, error detection method thereof, and set value correction method

Growing community of inventors

Tokyo, Japan

Nobuyasu Takemura