A multiband lumped-element varactor-tuned Gunn oscillator

MANY IMPROVEMENTS have been made in the instantaneous and tuning bandwidths of 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, crimination of distributed components of dimensions that arc appreciable fractions of a wavelength, and replacement of these: 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.