Isotropic conversion loss as a measure of quasi-optical mixer efficiency

Abstract

Conversion loss is an important practical measure of conventional mixer performance, but the usual definition of conversion loss is often inconvenient and inadequate when applied to quasi-optical mixers with integrated antennas. We herein define a new quantity called isotropic conversion loss (Liso) which not only characterizes quasi-optical mixers with greater accuracy, but is also easier to measure in the laboratory. Experimental results from tests of two different mixers demonstrate the utility of the new measure Liso.