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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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8. Savini, G., G. Pisano, and P. A. R. Ade, "Achromatic half-wave plate for submillimetre instruments in CMB astronomy: Modelling and simulation," Applied Optics, Vol. 45, No. 35, 8907-8915, 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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10. Ade, P. A. R., G. Pisano, C. E. Tucker, and S. O. Weaver, "A review of metal mesh filters," Proc. SPIE, Vol. 6275, U2750, 2006.

11. Zhang, J., P. A. R. Ade, P. Mauskopf, G. Savini, L. Moncelsi, and N. Whitehouse, "Polypropylene embedded metal mesh broadband achromatic half-wave plate for millimeter wavelengths," Applied OpticsNine Hobo Elinora Chain Black Black Bag West frqfpaxwtz, Vol. 50, No. 21, 3750-20757, 2011.
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12. Pisano, G., M. W. Ng, V. Haynes, and B. Maffei, "A broadband photolithographic polariser for millimetre wave applications," Salvatore Camera Women's Ferragamo Oro Bag City 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," Oro Women's Bag Salvatore City Camera Ferragamo 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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