Conference Paper

Design of a triband lumped element filter for digital microwave power amplifiers

  • Monica Martinez-Mendoza /
  • Andreas Wentzel /
  • Wolfgang Heinrich /
  • Alejandro Alvarez-Melcon
Conference Proceeding cp
European Microwave Week 2015: "Freedom Through Microwaves", EuMW 2015 - Conference Proceedings; 2015 45th European Microwave Conference Proceedings, EuMC
  • Fecha: 02 December 2015
  • Páginas: 805-808
  • ISBN: 9782874870392
  • Source Type: Conference Proceeding
  • DOI: 10.1109/EuMC.2015.7345886
  • Document Type: Conference Paper
  • Publisher: Institute of Electrical and Electronics Engineers Inc.
© 2015 EuMA.In this paper, a compact lumped element triband reconstruction filter for digital microwave power amplifier (PA) applications in the 0.8, 1.8 and 2.6 GHz band is presented. The proposed design introduces three first order passbands with additional transmission zeros for maximum isolation between bands. Detailed equations are presented for a systematic design of the filter. In contrast to common filter designs, the input characteristic impedance is optimized broadband to values different from 50¿ as is required for proper amplifier operation. The presented design strategy can be easily extended to multiband filters of higher orders. Insertion losses of 0.8 dB, 1.4 dB and 0.9 dB are achieved at 0.8 GHz, 1.64 GHz and 2.22 GHz, respectively. The filter shows a 3 dB bandwidth of 290 MHz in the 0.8 and 1.8 GHz band and almost 1 GHz in the 2.6 GHz region. The prototype represents the first triband filter suitable for proper digital RF PA operation.

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