DESIGN TECHNIQUES FOR TEM NETWORKS.
Rept. no. 2 (Final) 16 Aug 66-15 Apr 67,
BENDIX RESEARCH LABS SOUTHFIELD MI
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Design techniques and element value tables are presented for the construction of compact high-selectivity diplexers using digital elliptic component filters. A brief review of applicable diplexer theory is given and the derivation and use of the element value tables are discussed. The tables provide element values for component filters with an even number of branches n for n 4 through n 12. Two ripple values are given corresponding to maximum diplexer input VSWRs of approximately 1.261 and 1.101. For n 8, 10 and 12 branch filters, additional tables with permuted transmission zero orders are given. Test results for an n 6 branch experimental diplexer of 2.251 bandwidth are presented. The design and construction of this diplexer is described in detail and serves to illustrate the use of the element value tables and design procedures presented. Many practical construction and alignment suggestions are given which are useful in obtaining designs with good response characteristics. The experimental diplexer has cross-over frequencies at 1.5 GHz and 3.4 GHz and provides greater than 50 dB isolation at frequencies 0.2 GHz from crossover.
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