Electronically Tunable Microwave Bandstop Filters
Hunter, I.C.; Rhodes, J.D.
Microwave Theory and Techniques, IEEE Transactions on
Volume 30, Issue 9, Sep. 1982 Page(s):1361 - 1367
Digital Object Identifier   10.1109/TMTT.1982.1131261
Summary:The design procedures for varactor tuned bandstop filters are presented. A novel circuit technique for realizing bandstop filters with a symmetrical frequency response is described and explicit design formulas are presented. The physical design and experimental performance of a three cavity varactor tuned bandstop filter tunable around 4 GHz is presented. Experimental results are substantiated with computer analysis which includes the effects of varactor resistance.

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