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Calibration of a polarimetric microwave radiometer using a double directional coupler

Abstract: This paper presents a built-in calibration procedure of a 10-to-20 GHz polarimeter aimed at measuring the I, Q, U Stokes parameters of cosmic microwave background (CMB) radiation. A full-band square waveguide double directional coupler, mounted in the antenna-feed system, is used to inject differently polarized reference waves. A brief description of the polarimetric microwave radiometer and the system calibration injector is also reported. A fully polarimetric calibration is also possible using the designed double directional coupler, although the presented calibration method in this paper is proposed to obtain three of the four Stokes parameters with the introduced microwave receiver, since V parameter is expected to be zero for the CMB radiation. Experimental results are presented for linearly polarized input waves in order to validate the built-in calibration system.

 Authorship: de la Fuente L., Aja B., Villa E., Artal E.,

 Fuente: Remote Sensing, 2021, 13(11), 2109

 Publisher: MDPI

 Publication date: 27/05/2021

 No. of pages: 17

 Publication type: Article

 DOI: 10.3390/rs13112109

 ISSN: 2072-4292

 Spanish project: ESP2015-70646-C2-2-R