US 7,774,034 B2Granted

Signal switching device

AssigneeNtt Docomo, Inc.

InventorsKunihiro Kawai, Daisuke Koizumi, Kei Satoh, Shoichi Narahashi, Tetsuo Hirota

Life of this patent

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Abstract

A signal switching device including a plurality of transmission paths connected to an input path, the signal switching device outputting a signal from the input path through one of the transmission paths, including a first variable impedance unit connected to a first transmission path, the first variable impedance unit including a first section formed from a superconducting material, the first section being set to a non-superconducting state when the signal is to be output through a second transmission path, the first section including a portion of a predetermined length at an input end, the portion having an area of a cross section less than an area of a cross section of the first section at an output end.

Claims5

Dependent claims

A signal switching device including a plurality of transmission paths connected to an input path, said signal switching device outputting a signal from the input path through one of the transmission paths, comprising:

a first variable impedance unit connected to a first transmission path, said first variable impedance unit including a first section formed from a superconducting material, said first section being set to a non-superconducting state when the signal is to be output through a second transmission path,
wherein said input path and each of said plurality of transmission paths are formed by a wave guide including a central conductor and a coplanar grounding conductor, the ground conductor being spaced from the central conductor, and
said first section includes a first portion at an input end of the first section and a second portion at an output end of the first section, an output end of the first portion being connected to an input end of the second portion, and a width of the second portion increases from the input end of the second portion to an output end of the second portion.

Dependencies are inferred from the claim text.

Facts

Application: 11/693,402Filed 29 Mar 2007 · division
Priority: JP 2002-3244227 Nov 2002
Published: US 2007/0230450 A14 Oct 2007
Granted: 10 Aug 2010
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H01P 1/127
By mechanical chopper: strip line switches
H01P 1/15
For switching or interrupting: by semiconductor devices
Y10S 505/701
High TC, above 30 k, superconducting device, article, or structured stock: coated or thin film device, i.e. active or passive
Y10S 505/703
Coated or thin film device, i.e. active or passive: microelectronic device with superconducting conduction line

Family

Application10/702,573Parent of this division · filed 7 Nov 2003
US 2007/0230450 A1Pre-grant publication · published 4 Oct 2007
US 7,307,045 B2Parent of this division
US 2004/0097379 A1Published application
US 7,774,034 B2This patent

From the US filing history. Foreign family members aren’t listed.