Output Section - Graphs


The graphical output from the Coupling Matrix Synthesis program is arranged as a number of tabbed panes, each displaying a certain combination of filter characteristics.
 
There are tabs for displaying the following parameters:
  • S-parameters, S11 (dB) and S21 (dB)
  • S-parameters, S11 (phase) and S21 (phase)
  • S-parameter, S21 (dB) and Group Delay
  • S-parameters, S21 (dB) and S21 (phase)
  • Loaded Q or equivalent stored energy (nJ/W) for each resonator
  • S-parameters (dB, angle) + group delay in tabular form vs. frequency 
S21 in dB versus group delay.

 

The 'hump' around the center frequency in the group delay characteristic, is the result of a pair of complex transmission zeroes.
Loaded Q and stored energy (10-9J/Watt) for each resonator in the filter.

 

This parameter is required in order to find out if the filter has problems with power handling and to pinpoint the resonators where breakdown may occour first.
 More information on power handling analysis of Rf filters can be found in [6] & [7].
The graphs can be arranged by changing the values on the axes.
Curve values can be red out by inserting markers.

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