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US 2002/0158703 A1Published application
Nonreciprocal circuit device and communication apparatus using same
AssigneeMurata Manufacturing Co., Ltd.
InventorTakashi Hasegawa
Life of this patent
Estimating the term…
Abstract
A nonreciprocal circuit device includes a permanent magnet, a ferrite element to which a DC magnetic flux is applied by said permanent magnet, a plurality of center electrodes provided on the ferrite element, an upper casing member, and a lower casing member. The upper and lower casing members accommodate the permanent magnet, the ferrite element, and the center electrodes. The thickness of the lower casing member is set to the range between 50% and 100% of the thickness of the upper casing member. The upper and lower casing members are made of an iron-based metal.
Claims20
A nonreciprocal circuit device comprising:
- a permanent magnet;
- a ferrite element to which a DC magnetic flux is applied by said permanent magnet;
- a plurality of center electrodes provided on said ferrite element;
- and
- a metal casing which is made of an iron-based metal and which accommodates said permanent magnet, said ferrite element, and said center electrodes,
- wherein said metal casing comprises a first casing member and a second casing member, the first casing member and said permanent magnet are in magnetic contact with each other, and the second casing member has a thickness between 50% and 100% of a thickness of the first casing member.
3 more elements
A nonreciprocal circuit device comprising:
- a permanent magnet;
- a ferrite element to which a DC magnetic flux is applied by said permanent magnet;
- a plurality of center electrodes provided on said ferrite element;
- and
- a metal casing which is made of an iron-based metal and which accommodates said permanent magnet, said ferrite element, and said center electrodes,
- wherein said metal casing comprises a first casing member and a second casing member, the first casing member and said permanent magnet are in magnetic contact with each other, and the second casing member has a thickness between 50% and 100% of a thickness of the first casing member;
- wherein the first casing member comprises a pair of first casing sidewalls that oppose each other, and the second casing member comprises a pair of second casing sidewalls that oppose each other, the first casing sidewalls and the second casing sidewalls being overlapped and joined to each other;
- wherein a resin casing member is incorporated in said metal casing and accommodates said ferrite element and said center electrodes, said resin casing member having contact-preventing portions provided between respective inner surfaces of the first and second casing sidewalls and a peripheral surface of said permanent magnet;
- and
- wherein said contact-preventing portions have a thickness greater than that of the upper casing member, and have upper surfaces which are extended to a location higher than a bottom surface of the magnet.
7 more elements
A nonreciprocal circuit device comprising:
- a permanent magnet;
- a ferrite element to which a DC magnetic flux is applied by said permanent magnet;
- a plurality of center electrodes provided on said ferrite element;
- and
- a metal casing which is made of an iron-based metal and which accommodates said permanent magnet, said ferrite element, and said center electrodes,
- wherein said metal casing comprises a first casing member and a second casing member, the first casing member and said permanent magnet are in magnetic contact with each other, and the second casing member has a thickness between 50% and 100% of a thickness of the first casing member;
- wherein the first casing member comprises a pair of first casing sidewalls that oppose each other, and the second casing member comprises a pair of second casing sidewalls that oppose each other, the first casing sidewalls and the second casing sidewalls being overlapped and joined to each other;
- wherein said second casing sidewalls overlap respective inner surfaces of the first casing sidewalls;
- wherein a resin casing member is incorporated in said metal casing and accommodates said ferrite element and said center electrodes, said resin casing member having contact-preventing portions provided between respective inner surfaces of the first and second casing sidewalls and a peripheral surface of said permanent magnet;
- wherein said contact-preventing portions have a thickness greater than that of the upper casing member, and have upper surfaces which are extended to a location higher than a bottom surface of the magnet.
7 more elements
Dependencies are inferred from the claim text.