A proposed frequency selective surface reduces insertion loss in cryogenic receivers, highlighting performance across multiple bands.
A wideband and low‐insertion‐loss frequency selective surface (FSS) is proposed for the K/Q/W‐band cryogenic receiver of the Tianma Radio Telescope (TMRT). The FSS is designed to transmit W‐band electromagnetic waves (80–110 GHz) while reflecting K‐band (18–26 GHz) and Q‐band (35–50 GHz) signals. To reduce insertion loss caused by conventional prepreg bonding, a triple‐layer air‐gap‐supported metal‐dielectric structure is introduced. Each layer consists of hexagonal copper rings and patches patterned on Rogers 5880 substrates. The FSS achieves a measured insertion loss of 0.21 dB under oblique incidence, with stable performance under both Transverse Electric (TE) polarization and Transverse Magnetic (TM) polarization. Compared to recent designs, this study achieves a superior trade‐off between bandwidth and insertion loss at incidence, which is critical for quasi‐optical systems in millimeter‐wave astronomy.
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Wang et al. (2025) studied this question.
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