Fabry-Perot Interferometers at 168 Gc/s

Extension of high Q resonant devices, such as microwave cavities, into the millimeter region, leads to prohibitively small structures at frequencies above 100 Gc/s. The Fabry-Perot interferometer [1]-[3] serves as a satisfactory high Q millimeter resonator, however, since the size of the structure is relatively large compared to a wavelength. This size may be determined in part by external requirements. This paper presents the results of experiments on several different types of interferometers.