Title :
Advanced lumped-element trisection filter for digital microwave power amplifiers
Author :
Martinez-Mendoza, Monica ; Wentzel, A. ; Heinrich, W. ; Alvarez Melcon, A.
Author_Institution :
Ferdinand Braun Inst., Berlin, Germany
Abstract :
In this paper, a compact lumped element bandpass reconstruction filter for digital microwave power amplifier applications in the 800 MHz band is presented. The filter, based on the trisection topology, includes a cross coupling which produces a transmission zero for maximum selectivity. In contrast to common filter designs the input impedance characteristic is optimized broadband to values different from 50 Ω, as is required for proper amplifier operation. The filter achieves an insertion loss of 0.8 dB and an equiripple bandwidth of 240 MHz, with improved out-of-band suppression.
Keywords :
band-pass filters; coupled circuits; microwave power amplifiers; advanced lumped-element trisection filter; bandwidth 240 MHz; broadband; compact lumped element bandpass reconstruction filter; cross coupling; digital microwave power amplifier; frequency 800 MHz; input impedance characteristic; insertion loss; loss 0.8 dB; maximum selectivity; out-of-band suppression; transmission zero; trisection topology; Band-pass filters; Filtering theory; Impedance; Inverters; Microwave filters; Power amplifiers; Resonator filters; Filters; class D; class S; digital; lumped; power amplifiers;
Conference_Titel :
Microwave Conference (EuMC), 2014 44th European
Conference_Location :
Rome
DOI :
10.1109/EuMC.2014.6986492
