23 July 2014 A 77-118 GHz resonance-free Septum polarizer
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Challenging the conventional bandwidth limit, we design an extremely wide-band circular waveguide septum polarizer, covering 42% bandwidth, from 77 GHz to 118 GHz, without any high-order resonance. The performance of this polarizer has been verified in between 75 GHz and 115 GHz. The Stokes parameters constructed from the measured data show that the leakages from I to Q are below ±2% and the Q U mutual leakage below ±1%. This result removes the major weakness of the septum polarizer and opens up a new domain of astronomical instrumentation for polarization measurement. Despite this polarizer is designed to cover 77-118 GHz, it can be straightforwardly downsized to cover higher frequencies with minor change. The measurement result of a G-band (140-220 GHz) polarizer is also presented.
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Yen-Lin Chen, Yen-Lin Chen, Hsiao-Feng Teng, Hsiao-Feng Teng, Tzihong Chiueh, Tzihong Chiueh, } "A 77-118 GHz resonance-free Septum polarizer", Proc. SPIE 9153, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VII, 91530R (23 July 2014); doi: 10.1117/12.2055718; https://doi.org/10.1117/12.2055718


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