A New Diplexer - Realized in Stripline

Diplexers usually have a three-way common junction whose rather complex discontinuity imposes severe restrictions on attempts to control the different impedances presented by channels of different frequency. A new type of stripline diplexer has been developed that employs series-connected distributed elements emerging from its common junction to yield a compact structure free of these discontinuity problems. The concept was implemented in a printed-circuit diplexer built as part of a C-band varactor-tripler circuit, and was verified by test.