Compact dual-fed distributed power amplifier

Type of content
Journal Article
Publisher's DOI/URI
Thesis discipline
Degree name
Publisher
University of Canterbury. Electrical and Computer Engineering
Journal Title
Journal ISSN
Volume Title
Language
Date
2005
Authors
Eccleston, K.W.
Abstract

The dual-fed distributed amplifier (DFDA) allows efficient combining of field-effect transistors (FETs) at the device level without using -way power combiners. However, the FETs must be spaced 180 , resulting in physically large circuits. In this paper, meandered artificial transmission lines (TLs) comprised of microstrip lines periodically loaded with short open-circuit stubs can be used in place of TLs to reduce the size. The approach incorporates FET input and output capacitances with the artificial TLs, thereby eliminating their detrimental effects on bandwidth and performance. Both simulation and experimental results of a class-A three-FET single-ended DFDA designed to operate at 1.8 GHz demonstrate the feasibility of this approach and the validity of the design method. The size reduction is approximately one-third compared to realization using microstrip lines only, and the maximum efficiency is greater than 35% over a bandwidth of 15%.

Description
doi 10.1109/TMTT.2004.842508
Citation
Eccleston, K.W. (2005) Compact dual-fed distributed power amplifier. IEEE Transaction on Microwave Theory and Techniques, 53(3, Part 1), pp. 825-831.
Keywords
distributed amplifiers, microstrip circuits, microwave field-effect transistor (FET) amplifiers, microwave power
Ngā upoko tukutuku/Māori subject headings
ANZSRC fields of research
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