Patent ID: 7495529

Claim:
A phase shift circuit, comprising: a first switching element for switching between a through path and a capacitor of a capacitance C 1 ; a second switching element for switching between a through path and a capacitor of a capacitance C 2 with respect to a ground; and first and second inductors each having an inductance L, wherein one ends of the first and second switching elements are connected to each other through the first inductor, the other ends of the first and second switching elements are connected to each other through the second inductor, the one end of the first switching element is connected to a high frequency signal input terminal, the other end of the first switching element is connected to a high frequency signal output terminal, and following expressions are satisfied assuming that a characteristic impedance of the high frequency signal input terminal and the high frequency output terminal is Z 0 : C 2 =4C 1 (1) Z 0 =( L/ 2C 1 ) 1/2 (2).