Analysis of Differential Line Length Diplexers and Long-Stub Filters

摘要

Formulas for calculating the appropriate waveguide width for perfect performance at two center frequencies were derived for the differential length diplexer and long-stub filter. The general characteristics of these devices are calculated in terms of phase angle with dissipation loss included. An analysis of bandwidth, dimensional and thermal expansion tolerances for these devices is also given. A single algebraic equation relating the diplexer performance and the various parameter first-order deviations is obtained. This relation gives guide lines for adjusting final performance and for predicting the combined effects of dimensional, thermal and frequency deviations upon the general performances. Examples of diplexer and long-stub filter designs and analyses are given. (Author)