volume | PIER Journals

Abstract

This study proposes an improved output matching design technique based on a two-stage harmonic suppression network, with the core innovation being a hybrid matching mode combining microstrip lines and lumped-parameter components in the output matching. In the first-stage harmonic suppression network, a third-order Butterworth filter serves as the prototype. Utilizing the Richards transformation and Kuroda rule, it is converted into a cross-shaped microstrip line, achieving high-frequency matching while suppressing second-harmonic components. The second-stage harmonic suppression network employs two series-connected LC resonant circuits to suppress third- and fifth-harmonics, respectively. To broaden bandwidth and enhance circuit stability, an improved negative feedback structure based on a second-order Butterworth low-pass filter prototype is introduced. Practical circuit testing within the 0.4-1.2 GHz operating bandwidth demonstrated output power ranging from 40.1 to 41.3 dBm and drain efficiency exceeding 51.63%, robustly validating the effectiveness of this approach.

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Mr. Tianyi Li

Professor Jingchang Nan

Dr. Jiawei Wang

Dr. Jesur Turxun