Double effective band-pass submm-filters based on anisotropic resonant meshes

We present the results of development of original band-pass filters for 4-channel radiometric diagnostics of hot plasma in the frequency range 260-400GHz. The filters constitute multilayer interference structures consisting of specially designed thin anisotropic 2D resonant metal meshes separated by polypropylene layers 150-170 microns thick. Due to anisotropy of meshes the transmission band position of the filters strongly depends on polarizations of the incident radiation. It enables to use only two filters for realizing a 4-channel spectral system that reduces costs of its production. Numerical simulations of frequency response of developed filters are compared with the results of their characterization at a submillimeter BWO-spectrometer. The technological aspects of filter fabrication are described.