Mitsubishi Denki Kabushiki Kaisha

Nippon Telegraph and Telephone Corporation

Nippon Telegraph

Telephone Corporation

Hideki Asao

Muneaki Mukuda

Naofumi Yoneda

Moriyasu Miyazaki

Takashi Katagi

Koichi Tsunekawa

Makoto Matsunaga

Kenichi Kagoshima

Osami Ishida

Hideyuki Oohashi

Kazuhisa Henmi

Koji Yamasaki

Takayuki Inuzuka

Yukihiro Tahara

Hideyuki Oh-Hashi

Hideo Ogawa

Yutaka Ozaki

Hiroshi Osakada

Hirotaka Kamino

Yukitsugu Yoshino

Kyouko Shinozaki

Kenji Tatano

Haruhiko Hieda

Tetsu Owada

Naosi Yamada

In the structure for connecting a board and a coaxial connector, which electrically connects a high-frequency boardmounted in an electroconductive casingand a coaxial connectora transfer boardis disposed between the high-frequency boardand the coaxial connectorand the high-frequency boardand the coaxial connectorare electrically connected through the transfer board

Connection structure for coaxial connector and multilayer substrate

A method of manufacturing a waveguide includes forming two waveguide units, each waveguide unit having a channel defined by a bottom wall and two side walls generally transverse to the bottom wall, flanges extending from the side walls, outside the groove, transverse to the side walls and generally parallel to the bottom wall, the flanges including though holes; joining the two waveguide units to each other so that the flanges of a first of the waveguide units abut the flanges of a second of the waveguide units, with the grooves forming a channel for guiding waves; and, by insert molding, forming a thermoplastic resin cover that fills the through holes in the flanges and covers both of the first and second waveguide units, at least partially.

Method of manufacturing a waveguide

A nonreflective waveguide terminator includes a waveguide portion and an electromagnetic wave absorber. The portion has a rectangular opening in a plane perpendicular to a radio-wave propagation direction. The portion has one open end in the direction and the other end closed by a terminating metal internal wall. The portion has a radio-wave propagation space surrounded by first and second metal internal walls parallel to a radio-wave electric field, and third and fourth metal internal walls perpendicular to the field. The exterior shape of the absorber is a parallelepiped. The absorber has a rear-end surface positioned at a predetermined distance from the terminating wall and parallel to the terminating wall or is provided against the terminating wall. The surface of the absorber having the largest rectangular area is on the third or the fourth metal internal wall.

Nonreflective waveguide terminator and waveguide circuit

A waveguide unit including a vertically polarized waveguide, a horizontally polarized waveguide, and a waveguide type-polarized wave converter interposed between said waveguides. The waveguide type-polarized wave converter has a slit, the shape of which being combination of two quadrate parts and a connecting part for connecting the two quadrate parts. Those polarized waveguides and polarized wave converter are integrally manufactured but can be divided into two parts.

Waveguide twist having quadrate sections

High frequency packages have a plurality of apertures (notches) as antennas, and each of these apertures possesses a specific resonance frequency that may exist within the frequency bandwidth used in the high frequency packages in a high frequency band. Thus, the resonance frequency produced within the package is shifted outside the frequency bandwidth. A high frequency package is provided with a metal frame disposed on a metal bottom plate and having apertures for connecting with external terminals, dielectrics being disposed on the bottom metal plate, and on which a high frequency transmission line and a plurality of input and output terminals are formed, microwave circuitry being contained in the metal frame, and a metal lid, wherein the frequency of the aperture's resonance arising from electromagnetic field between the metal frame and the metal bottom plate, is shifted outside the frequency bandwidth by diminishing and optimizing the width of the aperture.

High frequency package

In order to perform feeding to an inverted F antenna having a plate conductor of an approximately rectangular shape for forming a radiation conductor and a ground conductor arranged in parallel with the plate conductor, a strip conductor plate connected to a feeder line is provided on the ground conductor via a dielectric substrate. Hence, the feeding from the feeder line to the inverted F antenna 37 is performed by an electric field coupling of the plate conductor and the strip conductor plate. The inverted F antenna and a resonator are integrated by coupling means to carry out an impedance matching, and the inverted F antenna and the resonator 62 constitute a band pass filter.

Antenna device having a band pass filter

In order to perform feeding to an inverted F antenna having a plate conductor of an approximately rectangular shape for forming a radiation conductor and a ground conductor arranged in parallel with the place conductor, a strip conductor plate connected to a feeder line is provided on the ground conductor via a dielectric substrate. Hence, the feeding from the feeder line to the inverted F antenna 37 is performed by an electric field coupling of the plate conductor and the strip conductor plate. The inverted F antenna and a resonator are integrated by coupling means to carry out an impedance matching, and the inverted F antenna and the resonator 62 constitute a band pass filter.

Inverted F antenna with non-contact feeding

A frequency synthesizer, which controls the fluctuation of frequency not only of a long period but also a short period, ensures a wide frequency control range and can be realized at a low cost, can be obtained. The frequency synthesizer includes a first control circuit and a second control circuit, the first control circuit having a first variable frequency divider connected between a coupler for extracting a part of an oscillator and a main coil disposed within a magnetic circuit, a first phase detector, a first reference signal generator, a first loop filter and a first coil driving circuit and the second control circuit having a second variable frequency divider connected between said coupler and a sub-coil disposed in said magnetic circuit, a second phase detector, a second reference signal generator, a second loop filter and a second coil driving circuit in order to share the roles in such a manner that the first control circuit controls the fluctuation of the long period frequency, while the second control circuit controls the fluctuation of the short period frequency.

Stabilized frequency synthesizer

Growing community of inventors

Tokyo, Japan

Hideki Asao