Patent ID: 7167065
Filing Date: 2007-01-23
Classification: H01P

Abstract:
1. A filter circuit comprising: a complex block which realizes a complex zero of a transfer function; a real/pure imaginary block which realizes a real zero of a transfer function and a pure imaginary zero of the transfer function; and a single path circuit which couples the complex block with the real/pure imaginary block through a single-path, wherein the complex block comprises: a first end resonator; a first resonator that is coupled to the first end resonator; a second resonator that is coupled to the first resonator; a third resonator that is coupled to the second resonator; a fourth resonator that is coupled to the third resonator; and a second end resonator that is coupled to the fourth resonator; and a coupling between the first end resonator and the second end resonator, a coupling between the first resonator and the fourth resonator, and a coupling between the second resonator and the third resonator are in phase.