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A broadband metal-mesh half-wave plate for millimetre wave linear polarisation rotation

Pisano, Giampaolo, Ng, Ming Wah, Haynes, Victor and Maffei, Bruno 2012. A broadband metal-mesh half-wave plate for millimetre wave linear polarisation rotation. Progress In Electromagnetics Research M 25 , pp. 101-114. 10.2528/PIERM12051410

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We present a polarisation rotator based on a dielectrically embedded metal Mesh Half Wave Plate (MHWP) working in the W-band frequency range (75-110 GHz). The device was realised using metallic grids with sub-wavelength anisotropic geometries able to mimic the behaviour of natural birefringent materials. The device was designed using a combination of transmission line codes and finite-element analysis able to achieve phase accuracy down to a fraction of degree. Very accurate intensity and phase measurements were carried out using coherent radiation from a Vector Network Analyser (VNA). The presented device performs better and it is much thinner than previous devices having reduced the number of grids by a factor two and minimised their inductive losses. The new mesh HWP has excellent performances in terms of differential phase-shift flatness and cross-polarisation, respectively 180.4±2.9° and -28 dB across a 25% bandwidth.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QC Physics
Publisher: EMW Publishing
ISSN: 1937-8726
Last Modified: 04 Jun 2017 06:27

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