Hitachi Metals, Ltd.

Hitachi Cable, Inc.

Masahisa Kaneta

Tomoyuki Ogawa

Nobuaki Kitano

Naoki Iso

Yoshiaki Ishigami

Tsukasa Fujishima

Ryouji Matsubara

Kazutaka Ohura

An antenna device includes a transmission line for propagating high frequency signal, and a plurality of antenna elements connected to the transmission line. The transmission line includes a first plate-shaped conductor, a second plate-shaped conductor, and a third plate-shaped conductor electrically grounded, a first central conductor disposed between the first and second plate-shaped conductors, a second central conductor disposed between the second and third plate-shaped conductors, an electrically connecting member inserted in an inserting hole formed through the second plate-shaped conductor, to electrically connect the first and second central conductors together, and an electrically grounded conductor disposed adjacent to the electrically connecting member. At least one of the first and second central conductors is provided with a through hole formed adjacent to the electrically connecting member, thereby electrically connects together wiring patterns provided on both surfaces, respectively, of a dielectric substrate of the at least one of the first and second central conductors.

Antenna device

An antenna device includes a center substrate including a dielectric substrate and a center conductor on the dielectric substrate, and two ground plates sandwiching via an air layer the center substrate therebetween to form a feeder line. A hole is formed in the dielectric substrate on at least one side of the center conductor along a longitudinal direction of the center conductor.

A phase shifter includes dielectric members including facing portions facing a signal line formed on a surface of a substrate and being made of a dielectric material, a supporting member configured to support the dielectric members and receive a moving force for moving the dielectric members in a direction which is parallel to the substrate and crosses the signal line, and a moving mechanism configured to apply the moving force to the supporting member. At least either the dielectric members or the supporting member is provided with a protrusion configured to keep a distance between the facing portions of the dielectric members and the signal line.

Phase shifter having dielectric members inserted into a movable support frame

A phase-shift circuit being smaller in size than a conventional phase-shift circuit and being capable of causing a phase difference equivalent to or larger than that in the conventional phase-shift circuit between an input signal and an output signal is achieved. A phase-shift circuit includes: a signal line; and a dielectric member overlapping the signal line and being capable of reciprocating in a direction intersecting the signal line, and changes a phase of a signal propagating through the signal line. The dielectric member is configured of a frame body and a dielectric plate provided inside the frame body and having an overlapping area with the signal line increased or decreased by the reciprocation, and the frame body has a permittivity lower than a permittivity of the dielectric plate.

Phase-shift circuit and antenna device

The faulted sections are evaluated by calculating the measuring information resulted from the faults in various positions by the previous fault simulative calculation, introducing the resulting fault simulative measuring information into a self-organizing neural network having output elements of which number being more than that of input elements to permit the self-organizing neural network to learn the classification of the simulative measuring information, preparing an evaluation rule representing the correspondent relation between the output from the classification of the stimulative measuring information and the faulted position, thereafter introducing actual measured information into the self-organizing neural network to permit the self-organizing neural network to classify the introduced actual measured information, and evaluating the faulted section from an output classified by the self-organized neural network on the basis of the evaluation rule.

Growing community of inventors

Hitachi, Japan

Masahisa Kaneta