The software CoupleFil is a tool to create narrow single and multiple bandpass filters by using the theory of cross-coupling.


CoupleFil contains useful features:
  • Development of narrow single and multiple bandpass filters
  • Finding of optimal solution for transmission and reflexion curve
  • Calculation of coupling coefficients, center frequencies and coupling bandwidths
  • Selecting the best out of all possible topologies


Advantages of a CoupleFil design:
  • Fast filter development
  • Improved through loss compared to single-coupled cavity filters
  • Steeper frequency edges due to transmission zeros
  • Quick results
  • List of all possible filter topologies
  • Illustration of triplets, quadruplets and other structures
  • Appropriate tunable results
  • Smaller mechanical dimensions