Development of a tuner topology for multiharmonic matching and implementation on tunable dual band power amplifier design

Thesis Type: Doctorate

Institution Of The Thesis: Orta Doğu Teknik Üniversitesi, Faculty of Engineering, Department of Electrical and Electronics Engineering, Turkey

Approval Date: 2018


Supervisor: ŞİMŞEK DEMİR


In this thesis work, the effect of multi-harmonic load matching on improving the efficiency of power amplifiers is investigated. Techniques of efficient power amplifier design are discussed and analyzed in terms of multi-harmonic matching. Several circuit topologies are evaluated for multi-harmonic matching by discussing the advantages and the limitations. Specifically, a detailed multi-harmonic analysis of the triple stub topology is presented. The already-known single frequency impedance matching capability of the triple stub circuit is extended to the 2nd and the 3rd harmonic frequencies. It is shown by analysis for the first time that the triple stub topology is able to satisfy impedance matching not only at the fundamental frequency but also at the 2nd and the 3rd harmonic frequencies simultaneously without any limitation on the fundamental and the harmonic impedances. A novel, highly efficient dual band power amplifier utilizing a tunable triple stub load matching circuit is also designed and implemented. Thanks to the tunable structure, efficiency is maximized in both operating bands of the power amplifier; even tough, the upper band is located at the 2nd harmonic of the lower band.