Ultra-compact (80 mm2) differential-mode ultra-wideband (UWB) bandpass filters with common-mode noise suppression
Vélez Rasero, Paris (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Naqui Garolera, Jordi (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Fernández-Prieto, Armando (Universidad de Sevilla. Grupo de Microondas)
Bonache Albacete, Jordi (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Mata Contreras, Francisco Javier (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)
Martel, Jesús (Universidad de Sevilla. Grupo de Microondas)
Medina, Francisco (Universidad de Sevilla. Grupo de Microondas)
Martín, Ferran, (Martín Antolín) (Universitat Autònoma de Barcelona. Departament d'Enginyeria Electrònica)

Data:	2015
Resum:	This paper presents a novel approach for the implementation of balanced ultra-wideband (UWB) bandpass filters with common-mode noise suppression. To a first-order approximation, the differential-mode filter response is described by the canonical circuit model of a bandpass filter, i. e. , a cascade of series-connected resonators alternating with shunt-connected parallel resonant tanks. Thus, the series branches of the balanced filter are implemented by means of inductive strips and patch capacitors, whereas the shunt sections are realized through mirrored stepped-impedance resonators (SIRs) and low-impedance (i. e. , capacitive) short transmission-line sections. For the differential mode, the symmetry plane is a virtual ground, the wide strip sections of the SIRs are effectively grounded, and the SIRs behave as grounded inductors parallel connected to capacitors. However, for the common mode, where the symmetry plane is an open (magnetic wall), the SIRs act as shunt-connected series resonators, thus providing transmission zeros at their resonance frequencies. By properly tailoring the location of these transmission zeros, rejection of the common mode over the differential filter passband can be achieved. To illustrate the potential of the approach, an order-5 balanced bandpass filter covering the regulated band for UWB communications (3. 1-10. 6 GHz) is designed and fabricated. The filter exhibits common-mode rejection above 10 dB over the whole differential filter passband, with differential-mode insertion losses lower than 1. 9 dB and return losses better than 10 dB. Since the proposed design approach is based on planar semi-lumped components, filter size is as small as 10. 5 mm X 7. 6 mm.
Ajuts:	Ministerio de Ciencia e Innovación TEC2010-17512 Ministerio de Ciencia e Innovación CSD2008-00066 Ministerio de Economía y Competitividad TEC2013-40600-R Ministerio de Ciencia e Innovación TEC2011-13615-E Agència de Gestió d'Ajuts Universitaris i de Recerca 2014SGR-157
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió sotmesa a revisió
Matèria:	Common-mode suppression ; Differential filters ; Microstrip technology ; Stepped-impedance resonator (SIR) ; Ultra-wideband (UWB)
Publicat a:	IEEE transactions on microwave theory and techniques, Vol. 63 No. 4 (April 2015) , p. 1272-1280, ISSN 0018-9480

DOI: 10.1109/TMTT.2015.2401555

Pre-print 9 p, 2.5 MB

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