Bypassing the quadrature hybrid polarizer in uGMRT Band 4 antennas reduces instrumental leakage from 10-15% to 2-5%, stabilizes cross-hand phases independent of source polarization, and allows accurate recovery of polarization angle rotation for sources like DA 240.
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Reliability of uGMRT Band-4 Polarimetry: Results from a Quadrature Hybrid Polarizer Bypass Experiment
Bypassing the quadrature hybrid polarizer in uGMRT Band 4 antennas reduces instrumental leakage from 10-15% to 2-5%, stabilizes cross-hand phases independent of source polarization, and allows accurate recovery of polarization angle rotation for sources like DA 240.