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PIER M
 
Progress In Electromagnetics Research M
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A BROADBAND METAL-MESH HALF-WAVE PLATE FOR MILLIMETRE WAVE LINEAR POLARISATION ROTATION

By G. Pisano, M. W. Ng, V. Haynes, and B. Maffei

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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.

Citation:
G. Pisano, M. W. Ng, V. Haynes, and B. 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

References:
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7. Pisano, G., G. Savini, P. A. R. Ade, V. Haynes, and W. K. Gear, "Achromatic half-wave plate for submillimetre instruments in CMB astronomy: Experimental characterisation," Applied Optics, Vol. 45, No. 27, 6982-6989, 2006.
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9. Pisano, G., G. Savini, P. Ade, and V. Haynes, "A metal-mesh achromatic half-wave plate for use at submillimetre wavelengths," Applied Optics, Vol. 47, No. 33, 6251-6256, 2008.
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12. Pisano, G., M. W. Ng, V. Haynes, and B. Maffei, "A broadband photolithographic polariser for millimetre wave applications," ZAC Belay Moss Hobo Posen Women's Zac PIERS Proceedings, 1748-1751, Kuala Lumpur, Malaysia, March 27-30, 2012.

13. Maffei, B., G. Pisano, M. W. Ng, and V. Haynes, "Millimetre wave photolithographic polariser beam impact," Zac Hobo Belay Moss ZAC Posen Women's PIERS Proceedings, 1761-1765, Kuala Lumpur, Malaysia, March 27-30, 2012.

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15. Lerner, D. S., "A wave polarization converter for circular polarization," IEEE Trans. Antennas Propag., Vol. 15, 3-7, 1964.

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18., , Ansys High Frequency Structure Simulator: www.ansys.com..
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19., , Emerson & Cuming, Microwave Products, http://www.eccosorb.com/..
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