Processing

Please wait...

Settings

Settings

Goto Application

1. US20040041647 - Nonreciprocal circuit element having excellent signal transmission efficiency and communication apparatus using same

Office
United States of America
Application Number 10627248
Application Date 25.07.2003
Publication Number 20040041647
Publication Date 04.03.2004
Grant Number 6876269
Grant Date 05.04.2005
Publication Kind B2
IPC
H01P 1/383
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
PWAVEGUIDES; RESONATORS, LINES OR OTHER DEVICES OF THE WAVEGUIDE TYPE
1Auxiliary devices
32Non-reciprocal transmission devices
38Circulators
383Junction circulators, e.g. Y-circulators
H01P 1/36
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
PWAVEGUIDES; RESONATORS, LINES OR OTHER DEVICES OF THE WAVEGUIDE TYPE
1Auxiliary devices
32Non-reciprocal transmission devices
36Isolators
H01P 1/32
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
PWAVEGUIDES; RESONATORS, LINES OR OTHER DEVICES OF THE WAVEGUIDE TYPE
1Auxiliary devices
32Non-reciprocal transmission devices
H01P 1/387
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
PWAVEGUIDES; RESONATORS, LINES OR OTHER DEVICES OF THE WAVEGUIDE TYPE
1Auxiliary devices
32Non-reciprocal transmission devices
38Circulators
383Junction circulators, e.g. Y-circulators
387Strip line circulators
CPC
H01P 1/387
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
PWAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
1Auxiliary devices
32Non-reciprocal transmission devices
38Circulators
383Junction circulators, e.g. Y-circulators
387Strip line circulators
Applicants Alps Electric Co., Ltd.
Inventors Komai Eiichi
Sato Hiroki
Onishi Hitoshi
Agents Brinks Hofer Gilson & Lione
Priority Data 2002234070 09.08.2002 JP
Title
(EN) Nonreciprocal circuit element having excellent signal transmission efficiency and communication apparatus using same
Abstract
(EN)

A nonreciprocal circuit element includes a magnetic assembly including a ferrite magnetic body, a common electrode, and three central conductors; capacitors connecting to the respective central conductors; a permanent magnet which applies a DC bias magnetic field to the magnetic body; and a metal case which accommodates the magnetic assembly, the capacitors, and the permanent magnet, the metal case functioning as a magnetic yoke. The saturation magnetic flux density of at least a portion of the metal case and the residual magnetic flux density of the permanent magnet have negative temperature coefficients. Moreover, the portion of the metal case is composed of a magnetic material having a larger absolute value of the temperature coefficient of the saturation magnetic flux density than the absolute value of the temperature coefficient of the residual magnetic flux density of the permanent magnet in the range of −35° C. to +85° C.


Related patent documents