US 7,127,215 B2 · Transmitting/receiving switch

Abstract

A transmitting/receiving switch, in which a transmission terminal connected to a transmission circuit is connected to an antenna terminal through a first switching element, a filter for attenuating harmonic contents in a transmission signal, a phase-shift circuit for significantly increasing an impedance from a node toward said transmission terminal in a reception frequency band by phase-adjusting the amount of phase shift by performing phase adjustment according to the amount of the phase shift generated by said filter. Furthermore, the antenna terminal connected to an antenna ANT is connected to a reception terminal through the node and a second switching element, and the reception terminal is connected to a reception circuit Rx.

Claims11

Dependent claims

A transmitting/receiving switch comprising:

an antenna terminal connected to an antenna;
a transmission terminal connected to a transmission circuit;
a reception terminal connected to a reception circuit;
a first switching element that turns on or off the connection between said antenna terminal and said transmission terminal;
a second switching element coupled directly to the antenna terminal that turns on or off the connection between said antenna terminal and said reception terminal;
a filter coupled between said first switching element and said antenna terminal;
and
a phase shift circuit coupled between the filter and the antenna terminal, wherein the phase shift circuit compensates for the phase shift of said filter.

5 more elements

Dependencies are inferred from the claim text.

Transmitting/receiving switch

Life of this patent

Transmitting/receiving switch

Life of this patent

Abstract

Claims11