METAL MESH COUPLERS USING EVANESCENT WAVES AT MILLIMETER AND SUBMILLIMETER WAVELENGTHS

In this paper we introduce a metal mesh evanescent wave coupler that m akes use of evanescent wave coupling between a metal mesh and a dielec tric plate, as a quasi-optical component for millimeter and submillime ter wavelengths. The transmission properties of this type of couplers have been investigated experimentally and theoretically for both capac itive and inductive metal meshes in the frequency range from 40 GHz to 60 GHz. The transmittance of a capacitive metal. mesh evanescent wave coupler can be adjusted more than 70% by changing the spacing between the capacitive mesh and the silicon plate less than 0.15 mm at around 57 GHz.