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Broadband Millimeter Wave Notch Filter Based on Metamaterial Structure

In this paper, the results of the research of electromagnetic characteristics of millimeter-wave notch filters based on metasurfaces are presented. The samples of metamaterials were three-layer planar structures based on split-ring resonators made on metallized textolite FR4 using photolithography technology. Topological parameters elementary cells of researched metamaterials are shown. In the CST Studio software package by frequency solver comprehensive modeling of transmission, reflection and absorption coefficients were carried out. Experimental research of metamaterial samples was carried out on two measuring setups (continuous wave and time-domain spectroscopy) in frequency range from 34 GHz to 1 THz. The considered metastructures have a wide band-stop frequency region of the order of 40–50 GHz, which can be shifted in frequency by changing the unit cell parameters of the periodic metasurface. The use of such materials will make it possible to create band-stop filters for various frequency ranges or microwave sensors for electromagnetic parameters of the medium.