Patent ID: 6759930
Filing Date: 2004-07-06
Classification: H01P,Y10S

Abstract:
A filter circuit, comprising:a first resonator, a second resonator and a third resonator each having a resonance frequency differently arranged in order on a frequency axis, a first block including the first resonator, a second block including the second resonator, a third block including the third resonator, wherein the first block includes a delay unit connected to the first resonator, and the third block includes another delay unit connected to the third resonator; an input terminal configured to divide an input signal to the first block, the second block and the third block; and an output terminal configured to combine signals passing through the first block, the second block and the third block, and to output the combined signal; wherein the delay unit converts a phase of the signal passing through the first block to reverse phase or nearly reverse-phase, and wherein another delay unit converts a phase of the signal passing through the third block to reverse-phase or nearly reverse-phase.