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2012-07-06

A Broadband Metal-Mesh Half-Wave Plate for Millimetre Wave Linear Polarisation Rotation

By Giampaolo Pisano, Ming Wah Ng, Victor Haynes, and Bruno Maffei
Progress In Electromagnetics Research M, Vol. 25, 101-114, 2012
doi:10.2528/PIERM12051410

Abstract

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.

Citation


Giampaolo Pisano, Ming Wah Ng, Victor Haynes, and Bruno Maffei, "A Broadband Metal-Mesh Half-Wave Plate for Millimetre Wave Linear Polarisation Rotation," Progress In Electromagnetics Research M, Vol. 25, 101-114, 2012.
doi:10.2528/PIERM12051410
http://jpier.org/PIERM/pier.php?paper=12051410

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