A novel broadband Q-band polarizer with very flat phase response

G. Pisano, R. Nesti, M. W. Ng, A. Orfei, D. Panella, P. Wilkinson

    Research output: Contribution to journalArticlepeer-review

    Abstract

    We present a 33-50 GHz circular waveguide polarizer based on a broadband combination of retarders. The device was designed within the FP7 RadioNet APRICOT (All Purpose Radio Imaging Cameras on Telescopes') consortium for the development of focal plane arrays for radiotelescopes. The device is based on a Pancharatnam recipe used in optics and behaves as a polarization transformer, from circular to linear and vice versa. This novel design of polarizer exhibits an unprecedented performance combining extremely flat differential phaseshift across the whole band, very low losses and very low Amplitude Unbalance (AU). It can be used in astronomical instruments or telecommunication antennas where very high purity circular polarization is required. The design was manufactured and then tested using a Vector Network Analyzer (VNA). Averaged across a 40% bandwidth the measured RL, IL, amplitude unbalance and differential phase-shift were respectively: -31.4/-35.3 dB, -0.09/-0.06 dB, 0.04 dB and 90.0 ± 0.4 o.
    Original languageEnglish
    Pages (from-to)707-715
    Number of pages8
    JournalJournal of Electromagnetic Waves and Applications
    Volume26
    Issue number5-6
    DOIs
    Publication statusPublished - 2012

    Fingerprint

    Dive into the research topics of 'A novel broadband Q-band polarizer with very flat phase response'. Together they form a unique fingerprint.

    Cite this