Optimisation-based design of transversal signal-interference microwave bandpass and lowpass filters with extended stopband
IdentifiersPermanent link (URI): http://hdl.handle.net/10017/51671
Agencia Estatal de Investigación
Gómez García, R., Yang, L. & Muñoz Ferreras, J.M. 2021, "Optimisation-based design of transversal signal-interference microwave bandpass and lowpass filters with extended stopband", IET Microwaves, Antennas & Propagation, vol. 15, no. 6, pp. 653-660.
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/TEC2017-82398-R/ES/ARQUITECTURAS RADAR MULTI-MODO AVANZADAS CON INCORPORACION DE HARDWARE DE RADIOFRECUENCIA ULTRA-RECONFIGURABLE Y MULTI-FUNCIONAL/
info:eu-repo/grantAgreement/EC/H2020/754382/EU/GOT Energy Talent/GET
Attribution-NonCommercial-NoDerivatives 4.0 Internacional
Generalised bi-path stepped-impedance-line signal-interference bandpass and lowpass transversal filtering sections (TFSs) with increased stopband bandwidth above the main transmission band are presented. They are realised by partitioning the two in-parallel transmission-line paths in their related classic spectrally periodic TFS approach into a plurality of line sub-segments, whose characteristic-impedance and electrical-length values are derived through optimisation. It is demonstrated that the stopband range above the transmission band in these generalised non-frequency-periodic TFSs can be remarkably broadened with regard to those intrinsic to their conventional bandpass and lowpass TFS counterparts. Furthermore, as added benefits, this is achieved for shorter transmission-line paths and a sharper cut-off slope between the transmission band and the extended stopband. For experimental-validation purposes, three proof-of-concept microstrip prototypes are manufactured and characterised. They correspond to a 1-GHz bandpass TFS, a 1-GHz two-TFS-in-series-cascade-based bandpass filter (BPF) with augmented selectivity and out-of-band power-rejection levels, and one lowpass TFS with a designed 3-dB cut-off frequency of 1.25 GHz.