Patent ID: 6396348
Filing Date: 2002-05-28
Classification: H01P,H03F

Abstract:
A circuit connected between an output terminal of an amplification transistor and a resistor for dealing with higher harmonics included in an output signal transmitted from said amplification transistor, comprising:(a) a first transmission line having an input terminal electrically connected to said output terminal of said amplification transistor, and having a length of &lgr;/4 wherein &lgr; indicates a wavelength of a fundamental harmonic; (b) a first group of transmission lines, including N transmission lines electrically connected in parallel with one another to an output terminal of said first transmission line, wherein N is an integer equal to or greater than 1, each of said N transmission lines having a length L defined by the following equation: L=&lgr;/4(1+M)(M=1, 2, 3, - - -, N), each of said N transmission lines having an open end; and (c) a second group of transmission lines, including N transmission lines electrically connected in parallel with one another to an output terminal of said first transmission line, each of said N transmission lines having a length Lh defined by the following equation: Lh+L=&lgr;/2, each of sand N transmission lines having an open end.