Full-Wave Modeling of Fabry-Perot Resonator in Millimeter Waves

One of two numerical principles on dielectric materials in connection with Multi Level Fast Multipole Method (MLFMM) and Uniform Theory of Diffraction (UTD) approximation of Method of Moments (MoM) have to be applied to analyze electrically large structures at higher frequencies. The paper deals with a development and comparison of several models of Fabry-Perot resonator for spectroscopic measurement of both gas attenuation and spontaneous emission. A simplified model capable to solve the resonator performance up to 110 GHz (i.e. the radius of the mirrors corresponding to 55 times wavelength) is introduced.