Adaption of 7th Degree Electrically Symmetrical Ladder Filters for Unsymmetrical Operation

Formulas are presented that permit symmetrical ladder filters, having 7th degree elliptic-function (or similar) response, to be adapted without change of insertion loss to accommodate unequal resistive terminations. These relations, together with those published previously for corresponding filters of 5th degree response, could extend the area of application of the existing catalogs of symmetrical designs.