Hitachi Metals, Ltd.

Hitachi Cable, Inc.

Seiji Kado

Satoshi Yoshihara

Tomoyuki Ogawa

Nobuaki Kitano

Xin Zhang

Hiroaki Satou

A phase-shifting circuitincludes a signal conductorthat transmits signals, and a dielectric bodythat is disposed to overlap the signal conductor, said phase-shifting circuit changing the phase of the signals by changing the area of an overlapping sectionwhere the signal conductorand the dielectric bodyoverlap each other. The phase-shifting circuit further includes a transformer unitfor matching impedance between the overlapping sectionand non-overlapping sectionwhere the signal conductorand the dielectric bodydo not overlap each other, said transformer unit being provided at end sections of the dielectric body, said end sections being on the input side and output side of the signals. The transformer unitincludes a high-impedance sectionthat is provided on the overlapping sectionside, and a low-impedance section, which is provided on the non-overlapping sectionside of the high-impedance section, and which has a lower characteristic impedance than the high-impedance section

Phase-shifting circuit and antenna device

An antenna device includes a plurality of antenna element groups including a plurality of antenna elements arranged in a horizontal direction. The plurality of antenna element groups are arranged in multiple stages in a vertical direction. The stage antenna element group includes a first antenna element group in which the antenna element in an even number sequence from the antenna element configuring the antenna element group is arranged at a shifted position to an upper side or a lower side in the vertical direction from the antenna element in an odd number sequence, and a second antenna element group in which the antenna element in the even number sequence from the antenna element configuring the antenna element group is arranged at a shifted position to the other side of the lower side or the upper side in the vertical direction from the antenna element in the odd number sequence.

Antenna device

An antenna device includes a plurality of antenna elements, a metal member integrally including a first wall and a plurality of second walls that are arranged in parallel to each other and perpendicularly extend from one surface of the first wall, and circuit boards that are respectively housed in substrate-housing spaces as gaps between the adjacent second walls and mount feeder circuits for feeding power to the plurality of antenna elements.

A planar antenna has a radiating element that radiates electric wave, and an earthing conductive plate that reflects the electric wave radiated from the radiating element. There is formed a space between the earthing conductive plate and the radiating element. The radiating element has a strip-shaped central conductive part with a length corresponding to the half wavelength of a first transmission radio frequency signal, and strip-shaped conductive parts with a length corresponding to the half wavelength of a second transmission radio frequency signal that has a frequency different from that of the first transmission radio frequency signal.

Growing community of inventors

Tokyo, Japan

Seiji Kado