Polarization Filter for Microstrip Lumped-Element Kinetic Inductance Detectors
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Polarization sensitivity is a major requirement in future cosmic microwave background studies. Even though lumped-element kinetic inductance detectors (LEKIDs) have already demonstrated a good performance in the millimeter range, the typical configuration based on linear meander inductors exhibits a cross polarization up to 30%. In this work, we propose a new configuration of LEKIDs coupled to a microstrip transmission line where the continuous ground plane has been replaced with parallel lines in order to be used as a polarizing grid. Microwave simulations and preliminary experiments show that the polarizer acts as an effective ground plane with no influence in the electromagnetic performance and that the cross polarization can be decreased to 3%.
KeywordsLumped-element kinetic inductance detectors Polarization Cosmic microwave background radiation
We acknowledge the support from the LabEx FOCUS. A. G. acknowledges the financial support from Spanish MINECO Grants ESP2015-65597-C4-1-R and CA16/00021.