Application of bilateral slotlines to broadband microwave components

Novel design of doubly-balanced mixers/modulators and even order frequency multipliers employing broadband microstrip-balanced stripline-bilateral slotline-unilateral slotline-microstrip baluns is proposed. Circuit concept is presented first, followed with the design and evaluation of balun components which involved a transverse resonance approach to the analysis of asymmetrical bilateral slotlines. Examples of application are: an X-Ku band mixer, a Ku-K band frequency doubler and a low conversion loss varistor frequency quadrupler circuit whose parameters have been evaluated numerically.