A multiband lumped-element varactor-tuned Gunn oscillator

MANY IMPROVEMENTS have been made in the instantaneous and tuning bandwidths o f certain microwave components in the past few years. In general, these improvements can bc directly attributed to circuit simplifications involving: elimination of dispersive transmission media, whenever possible, climination of distributed components of dimcnsions that arc appreciable fractions of a wavclcngth, and replacement of thcsc: elements with lumped or nearly lumped tuning and matching elements. This paper will describe a varactor-tuned Gunn oscillator which was designed with these factors considered of utmost importance in the overall design.