Patent ID: 7239218
Filing Date: 2007-07-03
Classification: H03H

Abstract:
1. A phase shifter for selectively switching between a low-pass filter and a high-pass filter by first and second single pole double throw switches provided on input and output sides and operatively linked to each other, comprising: a first impedance adjustment circuit provided across an input terminal and said first single pole double throw switch; and a second impedance adjustment circuit provided across an output terminal and said second single pole double throw switch; each of said first and second impedance adjustment circuits being made up by a capacitor and an inductor, said first impedance adjustment circuit being comprised of a first capacitor connected across said input terminal and a single pole side junction of said first single pole double throw switch and a first inductor connected across said input terminal and the ground; and said second impedance adjustment circuit being comprised of a second capacitor connected across said output terminal and a single pole side junction of said second single pole double throw switch and a second inductor connected across said output terminal and the ground.