Design of a high-power wide-band balun for the high-frequency region

A balun is a device for matching an unbalanced line to a balanced load. Described here is a balun with a cw (continuous wave) rating, with matched load, of 67.5 kva (kilovolt-amperes) over the frequency range from 2 to 30 mc (megacycles). A transmission-line-type design along with a newly developed ferrite core material and special cooling techniques have been used to achieve this wide bandwidth and high-power capabilities in a small size. A description of the unit and performance test results are included.