ELECTRICAL CHARACTERISTICS OF THE WAVE-GUIDE GRATING SYSTEM

Electromagnetic wave propagation is considered through a waveguide sys tem consisting of arbitrary number of short-period gratings (i.e. whos e period is much shorter than the wavelength). We assume that gratings are formed by ideal conductors having arbitrary cross-section. In ord er to ''stitch'' together the fields on gratings, equivalent boundary conditions are used. We have analyzed and studied experimentally the e lectrical characteristics of an adjustable frequency filter. The filte r consists of three short-period gratings formed by conductors with ci rcular cross-section. Experimental results are in good agreement with theory.