Patent ID: 7589603
Filing Date: 2009-09-15
Classification: H01P,H01Q

Abstract:
1. A phase shifter, comprising: an input port for receiving a radio frequency (RF) signal; a power dividing means for dividing the RF signal into a first divided signal of which phase is to be varied and a second divided signal having a fixed phase value; a first output port for outputting the second divided signal having the fixed phase value; a phase shift means for dividing the first divided signal into a third divided signal and a fourth divided signal wherein the third divided signal and the fourth divided signal move in opposite directions and for shifting phase of the third divided signal and the fourth divided signal based on a difference in a path length of the third divided signal and the fourth divided signal, to thereby generate phase-shifted signals; a phase delay means for delaying the third divided signal and the fourth divided signal based on the phase-shifted signals; and at least two second output ports connected to the phase delay means, for outputting the phase-shifted signals.