1 – Mylar film with AlN nano-structured layer,
2 – Teflon film with AlN nano-structured layer,
3 – Spectral radiant exitance at T = 300 K.
Sub-THz and microwave and sub-THz filters designed on flexible polymer substrates to shield the influence of background IR radiation noise in sensitive low-temperature detectors. They can be applied for increase operation parameters of highly sensitive low-temperature detector assemblies in facilities like VLBI Global Observing Systems .