"Plane Mesas": A New Technology for High Power Stacked Varactors

"Plane mesa" is the name for a new technology which yelds definite advantages when compared to traditional mesa structure, for straight forward stacking of chips, or for upside down mounting in order to reduce thermal resistances and (or) the series inductance. An example of practical application is presented in the field of stacked varactors for a doubler between 4 and 8 GHz. A single device in the standard F 27 d package delivery at 8 GHz - 15 Watts of peak power with a 50 % efficiency.