Generalized Chebyshev Bandstop Filter Synthesis Wizard

1. Features

  • Support of arbitrary, user defined topologies,
  • Robust algorithm of coupling matrix synthesis,
  • User-defined signs of the couplings,
  • Low-pass and band-pass input of filter specification,
  • On-the-fly preview of the filter prototype polynomials,
  • Automated transform between low-pass and band-pass prototypes,
  • User-defined masks on filter response,
  • Easy tuning of the imaginary zeros with slider,
  • Prewiev of the response with finite Q-factor resonators,
  • Export of the coupling matrix to text file.

2. Example of a bandstop coupling matrix synthesis

As an example the synthesis of the coupling matrix of a 8-th order filer is shown. TThe return loss level is -40dB, the frequency band 2.4GHz-2.48GHz, two imaginary zeros at 2.39GHz and 2.38GHz. T


Fig.1. Bandstop coupling matrix synthesis