A broadband and dual-polarization single-layer dichroic filter for applications in Sub-THz range

Paper i proceeding, 2022

In this work we report the design of a single-layer
all-metall dichroic filter with an improved spectral response at
non-normal beam incidence and nearly equal performance for
both polarizations. The dichroic is intended to be employed for
dual-frequency receivers. Since the dichroic is produced purely
from metal it facilitates its use at cryogenic temperatures.
Therefore, the contribution to the system noise is minimized.
The dichroic design concept demonstrated a measured
transmission of electromagnetic radiation of 85-90% for both
polarizations in the range of 35-50 GHz (37% fractional
bandwidth). The measurements were performed at room
temperature. The spectral properties of the dichroic have been
optimized by modeling in 3D FEM simulation software.