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This paper presents a ferrite and wire balun with performance similar to coaxial baluns. This balun makes two significant improvements over current technology: the wire impedance is adjusted for the ferrite and wire winding loading; and a trifilar wire is used to minimize skin effect losses. Insertion loss below 0.9 dB is achieved from 5 MHz to 2.5 GHz.
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Alfy Riddle (2002) studied this question.
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