Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Nippon Telegraph and Telephone Corporation

Nippon Telegraph

Telephone Corporation

Moriyasu Miyazaki

Naofumi Yoneda

Tamotsu Nishino

Hiroaki Sakamoto

Takashi Yanagi

Yusuke Kitsukawa

Takuma Kadoya

Yuichi Hagito

Masatake Hangai

Toshiyuki Horie

Tetsu Ohwada

Morishige Hieda

Makoto Matsunaga

Yukihiro Tahara

Tadashi Takagi

Masaomi Tsuru

Yoshihiko Konishi

Yoshio Inasawa

Yukihisa Yoshida

Kenji Kawakami

Tsutomu Endo

Akio Iida

Shigeru Makino

Kenichi Miyaguchi

Hideyuki Oh-Hashi

Yoji Aramaki

Takashi Katagi

Shuji Urasaki

Koichi Tsunekawa

Shinnosuke Soda

Kazuyoshi Inami

Izuru Naito

Hideki Asao

Kenichi Kagoshima

Kouichi Matsuo

Osami Ishida

Izuru Naitoh

Hiroyuki Satoh

Koji Yamanaka

Yukio Ikeda

Toru Fukasawa

Yoshitsugu Yamamoto

Akira Tsumura

Kazuhiro Miyamoto

Kenichi Tajima

Kazutomi Mori

Isamu Chiba

Hidenori Yukawa

Kazuhiro Mukai

Yukinobu Tarui

Yoji Isota

Hiroyuki Mizutani

Kazuhiro Nishida

Hiromitsu Uchida

Hiromoto Inoue

Yutaka Ozaki

Kousaku Yamagata

Sangseok Lee

Hiromasa Nakaguro

Yutaka Shimawaki

Masafumi Nakane

Yoshihiko Imai

Mikio Hatamoto

Hideyuki Ohhashi

Hirotaka Kamino

Akira Tumura

Shiroh Kitao

Masatoshi Nii

Satoshi Hamano

Norihiro Yunoue

Hideki Hatakeyama

Norio Umemura

Junko Nakayama

Yutaka Simawaki

Included are: a coaxial line () provided so as to pass through a second ground conductor (), a first dielectric substrate (), and a second dielectric substrate (), the coaxial line () including an outer conductor () allowing a first ground conductor (), a second ground conductor (), and a third ground conductor () to be conductive thereamong; and a conductive member () provided so as to pass through the first dielectric substrate (), the conductive member () allowing the first ground conductor () and the second ground conductor () to be conductive therebetween. An interface circuit () combines a plurality of signals having mutually different phases output from each of plurality of element antennas (), (), (), and () and outputs the combined signal to the coaxial line ().

Antenna device

Antenna element

An output terminalis provided at the connecting pointbetween the collector terminal of a transistorand an open-ended stubby connecting the open-ended stubto the collector terminal of the transistor, the open-ended stubhaving a line length equal to a quarter of the wavelength of a signal of frequency 2N&#xb7;For 2N times the oscillation frequency F. In addition, an output terminalis provided at a connecting pointlocated at a distance equal to a quarter of the wavelength of a signal of oscillation frequency Ffrom the end of an open-ended stubby connecting the open-ended stubto the base terminal of the transistor, the open-ended stubhaving a line length longer than a quarter of the wavelength of the signal of oscillation frequency F.

Oscillator, transmitter-receiver and frequency synthesizer

There is provided a variable device circuit according to the present invention, including: a substrate; at least one movable switch device formed on a first principal surface of the substrate; at least one fixed capacitor device formed on the first principal surface of the substrate; at least one variable capacitor device formed on the first principal surface of the substrate; at least one variable inductor device formed on the first principal surface of the substrate; and wiring lines for electrically connecting the devices to one another, the wiring lines being formed on the first principal surface of the substrate; wherein electrical connections among the devices can be selected by operation of the movable switch device, whereby achieving stable, low-loss circuit characteristics with lower manufacturing cost.

Variable device circuit and method for manufacturing the same

A switch circuit includes: a first input and output terminal; a first inductor connected with the first input and output terminal; a capacitor connected with the first inductor; a second input and output terminal connected with the capacitor; a first MEMS switch connected with one end of the capacitor; a second MEMS switch connected with the other end of the capacitor; and a second inductor connected between the first MEMS switch and the second MEMS switch, and satisfies a relationship of f=1/(2&#x3c0;&#x221a;CL)=1/(2&#x3c0;&#x221a;CL), where Lis an inductance of the first inductor, Lis an inductance of the second inductor, C is a capacitance of the capacitor, and f is a use frequency.

Switch circuit

A voltage-controlled oscillator has a tuned circuit for controlling the oscillation frequency. The tuned circuit has a variable-capacitance element whose capacitance varies in response to a control voltage and a negative capacitance circuit whose impedance frequency characteristics have opposite characteristics to those of a normal capacitance, and which is connected to the variable-capacitance element. The configuration enables increasing the variation ratio corresponding to the control voltage of the combined capacitance composed of the variable-capacitance element and negative capacitance circuit, thereby broadening the oscillation frequency band.

Voltage-controlled oscillator

A single pole single throw switch for controlling propagation of a high frequency signal between an input terminal () and an output terminal (). First FET switches () in which drains and sources of FETs () are connected in parallel with inductors () are connected in parallel. Each FET () is switched between on state and off state by a voltage being applied to the gate thereof. At the frequency of the high frequency signal, each inductor () connected with off capacitor of each FET () resonates in parallel.

SPST switch, SPDT switch and MPMT switch

The present invention provides a high-frequency switch including: a first switching element connected between a first input/output terminal and a second input/output terminal; a second switching element connected between the second input/output terminal and the first switching element; a high-frequency line provided between the first input/output terminal, the first switching element, and a third input/output terminal; and a third switching element connected between the third input/output terminal, the high-frequency line, and a ground. By connecting the first switching element, the second switching element, the high-frequency line, and the third switching element, because there exists no FET through which a large current flows when a state between the first input/output terminal and the third input/output terminal is set to a transmission state which requires high power handling capability, there is no need to use an FET having a large gate width, which is effective in reducing a loss of the switch.

High-frequency switch

A phase-shifting circuit includes: a first parallel circuit which is connected across input and output terminals of a high frequency signal, composed of a first inductor and a first switching element that exhibits a through state in an ON state and a capacitive property in an OFF state, and produces parallel resonance at a prescribed frequency when the first switching element is in the OFF state; a series circuit composed of a second inductor and a third inductor and connected in parallel with the first parallel circuit; a capacitor having its first terminal connected to a point of connection of the second and third inductors; and a second parallel circuit which is connected across a second terminal of the capacitor and a ground, composed of a fourth inductor and a second switching element that exhibits a through state in an ON state and a capacitive property in an OFF state, and produces parallel resonance at a prescribed frequency when the second switching element is in the OFF state. The phase-shifting circuit establishes by switching an operation mode of setting the first switching element at the ON state and the second switching element at the OFF state, or an operation mode of setting the first switching element at the OFF state and the second switching element at the ON state.

Phase-shifting circuit and multibit phase shifter

Provided is a small-size phase shift circuit having a broad band characteristic. The phase shift circuit includes: a first switching element for switching between a through path and a capacitance capacity; a second switching element for switching the capacitance capacity for the through path and the ground; and a first and a second inductor having inductance. One end of the first switching element is connected to one end of the second switching element by the first inductor while the other ends of the first and the second switching element are connected to each other by the second inductor. One end of the first switching element is connected to a high-frequency signal input terminal while the other end of the first switching element is connected to a high-frequency signal output terminal. Thus, it is possible to constitute a phase device satisfying a predetermined condition.

Phase shift circuit, high frequency switch, and phase shifter

A waveguide orthomode transducer includes a first radio wave conducting means for conducting an electric wave of a horizontally polarized wave branched by an electric wave branch means, for conducting another electric wave of the horizontally polarized wave, for combining the electric waves of the horizontally polarized wave into one electric wave and dividing this electric wave into an electric wave of a basic mode and an electric wave of a higher mode, and for outputting them, and a second radio wave conducting means for conducting one electric wave of a vertically polarized wave branched by the electric wave branch means, for conducting another electric wave of the vertically polarized wave, for combining the electric waves of the vertically polarized wave into one electric wave and dividing this electric wave into an electric wave of a basic mode and an electric wave of a higher mode, and for outputting them.

Waveguide orthomode transducer

Growing community of inventors

Tokyo, Japan

Moriyasu Miyazaki