Parametric study and synthesis of 60-GHz Fabry-Perot resonators

The analysis aid the synthesis of plane-parallel Fabry-Perot (FP) resonators, illuminated by a normally incident plane wave, are investigated theoretically and experitnentally in the 60-GHz band. The reflecting mirrors are inductive metal meshes with square apertures. The frequency response of symmetrical and asymmetric FP cavities is studied (a) approximately with the transmission-line theory (TL), and (b) and rigorously, with the Finite-difference-time-domain (FDTD) technique combined with periodic boundary conditions. Then, the inverse problem is solved with the use of an iterative procedure based on the FDTD method.]it particular, it is shown theoretically and checked experimentally that the thickness of the cavity is the most critical parameter in the design, although the grid dimensions enable a precise adjustment of the module and of the phase of the internal reflection coefficients. (C) 2002 Wiley Periodicals, Inc.