Patent ID: 7719386

Claim:
A phase shifter comprising: a low-pass filter; a high-pass filter; first and second single pole double throw switches provided on input and output sides of the low-pass filter and the high-pass filter respectively and operatively linked to each other, wherein the first and second single pole double throw switches each comprising: a first switch device that connects a single pole side junction node and said low-pass filter; a first inductance circuit connected in parallel with said first switch device; a second switch device that connects said single pole side junction node and said high-pass filter and that performs an ON/OFF operation exclusively from said first switch device; and a second inductance circuit connected in parallel with said second switch device; each said first inductance circuit being constituted by a serially-connected circuit of an inductor and a resistor, wherein the inductance of the inductor and the resistance of the resistor of each of the first inductance circuit and the capacitance of each said first switch device in an off state are selected so as to suppress fluctuation in the pass characteristics of the phase shifter.