Year 2015

• Miniaturized bandpass substrate integrated waveguide filter with frequency-dependent coupling realized using asymmetric GCPW discontinuity

  Publication

  • A. Jędrzejewski
  • Ł. Szydłowski
  • M. Mrozowski

  - MICROWAVE AND OPTICAL TECHNOLOGY LETTERS - Year 2015

  An asymmetric GCPW discontinuity is proposed to provide frequency-dependent coupling in microwave bandpass filters. Wider and narrow sections introduce, respectively, the capacitive and inductive component to the equivalent circuit representing coupling. By selecting the dimensions of the discontinuity and width of the inductive window in substrate integrated waveguide, an additional transmission zero can be introduced at prescribed...

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Year 2014

• Accurate design of pseudoelliptic inline SIW filters with frequency-dependent couplings

  Publication

  • A. Jędrzejewski
  • Ł. Szydłowski
  • M. Mrozowski

  - Year 2014

  This paper presents an accurate synthesis method for inline SIW (Substrate Integrated Waveguide) generalized Chebyshev bandpass filters with frequency-dependent couplings. The technique is based on the synthesis of a coupling matrix that takes into account the impedance of the frequency-dependent stub. Thus, a loading effect compensation in adjacent resonators (via resonant frequency adjustment) and coupling elements (via coupling-value...

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Year 2013

• A Trisection Filter Design With Negative Slope of Frequency-Dependent Crosscoupling Implemented in Substrate Integrated Waveguide (SIW)

  Publication

  • Ł. Szydłowski
  • A. Jędrzejewski
  • M. Mrozowski

  - IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS - Year 2013

  This letter reports on a novel realization of a microwave bandpass filter in a triplet configuration with a frequency-dependent crosscoupling implemented in substrate integrated waveguide (SIW). The design involves implementing dispersive coupling with a negative slope, a feature that allows the capabilities of the classic triplet topology to be extended. In this particular case, the implementation of two transmission zeros on...

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Year 2012

• Comparison of Optimization Techniques for Coupling Matrix Synthesis Using Eigenvalue Based Approach

  Publication

  • A. Jędrzejewski
  • Ł. Szydłowski
  • A. Lamęcki

  - Year 2012

• Zero-pole approach to computer aided design of in-line siw filters with transmission zeros

  Publication

  • A. Jędrzejewski
  • N. Leszczynska
  • Ł. Szydłowski
  • M. Mrozowski

  - Progress in Electromagnetics Research-PIER - Year 2012

  This paper presents a design of a new type of in-line pseudo-elliptic filters implemented in substrate integrated waveguide(SIW) technology. To realize transmission zeros in in-line topology,frequency-dependent couplings were used. Such dispersive couplingswere implemented as shorted stubs. The design process startswith the generation of a suitable starting point. To this end, anapproximation of SIW as a rectangular waveguide is...

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Year 2011

• Frequency-dependent coupling model for microwave band-pass filter

  Publication

  • A. Jędrzejewski
  • Ł. Szydłowski

  - Zeszyty Naukowe Wydziału ETI Politechniki Gdańskiej. Technologie Informacyjne - Year 2011

  The goal of this work was to create a circuit model which represents frequency-dependent coupling between microwave resonators. Our models are designed for in-line filters. The frequency-dependent coupling enables one to realize a transmission zero which is not possible in classical approach with frequency independent inverters. In addition, the proposed model allows us to observe out-of-band behavior, e.g. spurious resonance....