Power matching network comprising an intermediate transmission line between a transistor amplifier output end and at least one open-end line

Abstract

In a power matching network which is used between a load and a transistor amplifier producing at its output end an amplified signal comprising a fundamental frequency signal and odd and even harmonic signals and comprises a matching circuit between the load and a line end, an open-end transmission line is connected to the output end and has a predetermined length shorter than a quarter wavelength of the fundamental frequency signal. An intermediate transmission line is connected between the output and the line ends and has a length of a quarter wavelength less the predetermined length. At least one open-end transmission line is connected to the line end and has a length of a quarter wavelength of the odd harmonic signal which is preferably composed of (2n+1)-th harmonic signals, where n represents integers starting at 1 and ending at a predetermined integer of at least 2. More preferably, the line end is connected to an additional transmission line which is either a 1/8 wavelength of the fundamental frequency signal long and has an end shorted for high frequency signals or is a 1/16 wavelength of the fundamental frequency signal long.

Dependencies are inferred from the claim text.