Synthesis and Design of Suspended Substrate Stripline Filters for Digital Microwave Power Amplifiers
M. Martinez Mendoza1, A. Wentzel1, M. Sandhu2, A. Alvarez-Melcon3, W. Heinrich1 and I. Hunter2
Published in:
Proc. 46th European Microwave Conf. (EuMC 2016), London, UK, Oct. 4-6, pp. 898-901 (2016).
Abstract:
In this paper, a synthesis method for suspended substrate stripline filters for digital microwave power amplifier applications is presented. The synthesis method combines a lumped element and full-wave mixed approach in a very efficient way. In order to achieve high amplifier efficiency the filter must exhibit a high input impedance in the stopband. This has been implemented for the first time by using a capacitively end coupled filter combined with stepped impedance resonators. A third order filter was designed. Simulations show that the final stage drain efficiency of the power amplifier and suppression of out-of-band frequency components can be significantly improved when the new structure is used.
1 Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, 12489 Berlin, Germany
2 University of Leeds, Woodhouse Lane Leeds, LS2 9JT, UK
3 Technical University of Cartagena, Campus Muralla del Mar s/n, Cartagena, E-30202, Spain
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