Maltese-cross slot-array type frequency selective surface for a submillimeter-wave band

A dual-polarization Maltese-cross slot array (MCSA) type frequency selective surface (FSS) is designed for separating the submillimeter-wave band around 600 GHz in view of future application to spaceborne submillimeter-wave spectrometric radiometer. Based on this design, the FSS is fabricated by applying a photolithographic process on a thin dielectric (SiN) substrate. The transmission and reflection characteristics measured for the fabricated MCSA agree well with those simulated by the method-of-moment calculation. The possibility of the broadening of the transmission bandwidth by stacking the MCSA in two layers is also discussed.