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US 2002/0158705 A1Published application
Rf switch
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsHideaki Nakakubo, Tomoyuki Iwasaki
Life of this patent
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Abstract
A radio frequency (RF) switch which is used in an RF unit of a communication apparatus and has a less insertion loss during a transmission. A strip line disposed in the RF switch is formed by combining first and second strip lines having different values of the characteristic impedance from each other.
Claims11
A radio frequency (RF) switch for coupling an antenna selectively to one of a transmitting circuit and a receiving circuit, comprising:
- first diode coupled between said antenna and said transmitting circuit;
- a strip line coupled between said antenna and said receiving circuit;
- a second diode coupled between said receiving circuit and a ground;
- and
- a controller for controlling turning on/off of said first and second diodes, wherein said strip line is formed by first and second strip lines, and each of said first and strip lines has a different characteristic impedance from each other.
2 more elements
A radio frequency (RF) switch comprising:
- a layered body formed by laminating a plurality of dielectric sheets;
- an antenna terminal electrode disposed on an outer surface of said layered body;
- a transmitting terminal electrode disposed on the outer surface of said layered body;
- a receiving terminal electrode disposed on the outer surface of said layered body;
- a grounding electrode disposed in said layered body;
- a first diode disposed on said layered body and coupled between said antenna terminal electrode and said transmitting terminal electrode;
- a strip line disposed in said layered body and coupled between said antenna terminal electrode and said receiving terminal electrode;
- and
- a second diode disposed on said layered body and coupled between said receiving terminal electrode and said grounding electrode, wherein said strip line is formed by first and second strip lines, and each of said first and strip lines has a different characteristic impedance from each other.
6 more elements
A radio frequency (RF) switch comprising:
- a layered body formed by laminating a plurality of dielectric sheets;
- an antenna terminal electrode disposed on an outer surface of said layered body;
- a transmitting terminal electrode disposed on the outer surface of said layered body;
- a receiving terminal electrode disposed on the outer surface of said layered body;
- a grounding electrode disposed in said layered body;
- a first diode disposed on said layered body, coupled between said antenna terminal electrode and said transmitting terminal electrode;
- a strip line disposed in said layered body, coupled between said antenna terminal electrode and said receiving terminal electrode;
- and
- a second diode disposed on said layered body, coupled between said receiving terminal electrode and said grounding electrode, wherein an interval between said first strip line and said grounding electrode differs from an interval between said second strip line and said grounding electrode.
6 more elements
Dependencies are inferred from the claim text.