High Efficiency Planar Frequency Multiplier at Millimetre Waves and Quasi-Optical Investigations for (Sub) Millimetre Applications

This paper presents the design and measurement of a hybrid varactor frequency multiplier in the millimetre wave range and the first investigations on a quasi-optical frequency doubler. For the planar circuit, a multilayer technology was used for the synthesis of the source and load impedances of the varactor. The conversion losses are about 12 dB at 62 GHz with an output power of 10.8 dBm. The measurement test bench and results on passive circuits in quasi-optical technology are presented. A quasi-optical doubler has also been investigated and designed and the first results are presented.