A broadband W-band polarization rotator with very low cross polarization

Pisano, Giampaolo ORCID: https://orcid.org/0000-0003-4302-5681, Melhuish, Simon, Savini, Giorgio, Piccirillo, Lucio and Maffei, Bruno 2011. A broadband W-band polarization rotator with very low cross polarization. IEEE Microwave and Wireless Component letters 21 (3) , pp. 127-129. 10.1109/LMWC.2011.2104942

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Abstract

We present a 82–100 GHz circular waveguide polar- ization rotator based on a broadband rotating half-wave retarder.The device was designed for astrophysics experiments aimed to characterize the polarization of the cosmic microwave background radiation. The device is based on a Pancharatnam recipe used in optics [1] and has a very low intrinsic cross polarization, very flat phase response across the band and very low losses. It can be used in astronomical experiments where very high performance is re- quired but also as a variable polarization source for instrument calibrations. The design was manufactured and then tested using a millimeter-wave vector network analyzer. The average measured RL, IL and cross polarization across a 30% bandwidth were, respectively, -38 dB, -0.27 dB, and 36.5 dB.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Schools > Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Uncontrolled Keywords:	Modulation and coding, waveguide polarizers
ISSN:	1531-1309
Last Modified:	27 Oct 2022 08:28
URI:	https://orca.cardiff.ac.uk/id/eprint/62435

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