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Advanced lumped-element filters for digital microwave power amplifiers

Published online by Cambridge University Press:  29 June 2015

Monica Martinez Mendoza*
Affiliation:
Ferdinand Braun Institut, 12489 Berlin, Germany. Phone: +49 30 6392 2627
Andreas Wentzel
Affiliation:
Ferdinand Braun Institut, 12489 Berlin, Germany. Phone: +49 30 6392 2627
Alejandro Alvarez Melcon
Affiliation:
Technical University of Cartagena, Antiguo Cuartel de Antigones, Campus Muralla del Mar s/n, ES-30202 Cartagena, Murcia, Spain
Wolfgang Heinrich
Affiliation:
Ferdinand Braun Institut, 12489 Berlin, Germany. Phone: +49 30 6392 2627
*
Corresponding author: M. Martinez Mendoza Email: Monica.Mendoza@fbh-berlin.de

Abstract

In this paper, two compact lumped-element band pass reconstruction filters for digital microwave power amplifiers applications in the 800 MHz band are presented. The filters, based on the trisection and quartet topologies, include cross-couplings which produce transmission zeros for maximum selectivity, and can be designed with practical element values. In contrast to common filter designs the input impedance characteristic is optimized broadband to values different from 50 Ω, as required for proper amplifier operation. Both filters achieve an insertion loss of around 0.8 dB and an equiripple bandwidth of 240 MHz (trisection) and 290 MHz (quartet), respectively, with improved out-of-band suppression. Results show that a considerable improvement in amplifier linearity and efficiency can be obtained with the new proposed filters, as compared with simpler filters traditionally used in power amplifier applications.

Type
Research Paper
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2015 

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References

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