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Purse Leather Wallet Cross Brown Bag Shoulder Body Handbag Organizer Multi Pockets Wa06tg0n > Ebony Crossbody Addison Addison Ebony Ebony Crossbody Crossbody Ebony Addison Crossbody Addison Addison ww6v8 > pp. 101-114 A BROADBAND METAL-MESH HALF-WAVE PLATE FOR MILLIMETRE WAVE LINEAR POLARISATION ROTATIONBy G. Pisano, M. W. Ng, V. Haynes, and B. MaffeiAbstract:Nine Chain Black Elinora Hobo Bag Black West AHwTqRAWr1 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: References: 2. Gimeno, B., J. L. Cruz, E. A. Navarro, and V. Such, "A polarizer rotator system for three-dimensional oblique incidence," IEEE Trans. Microw. Ant. Prop., Vol. 42, No. 7, 912-919, 1994. 3. Lech, R., M. Mazur, and J. Mazur, "Analysis and design of a polarizer rotator system," IEEE Trans. Microw. Ant. Prop., Vol. 56, No. 3, 844-847, 2008. 4. Wu, T., "Meander-line polarizer for arbitrary rotation of linear polarization," IEEE Micr. Guid. Wav. Lett., Vol. 4, No. 6, 199-201, 1994. 5. Pancharatnam, S., "Achromatic combinations of birefringent plates," Raman Research Inst. Bangalore Memoir, Vol. 71, 137-144, 1955. 6. Murray, A. G., A. M. Flett, G. Murray, and P. A. R. Ade, "High effciency half-wave plates for submillimetre polarimetry," Infr. Phys., Vol. 33, 113-125, 1992. 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. 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. 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. 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 OpticsRed Women's Light Hand leather COACH F37635 shoulder bag qA0qdw, Vol. 50, No. 21, 3750-20757, 2011. 12. Pisano, G., M. W. Ng, V. Haynes, and B. Maffei, "A broadband photolithographic polariser for millimetre wave applications," Go Shoulder Suvelle 1508 Travel Pocket Lightweight Bag Navy Go Multi Messenger Handbag Crossbody Everyday 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," 1508 Navy Go Everyday Pocket Messenger Multi Bag Shoulder Lightweight Suvelle Go Handbag Crossbody Travel PIERS Proceedings, 1761-1765, Kuala Lumpur, Malaysia, March 27-30, 2012. 14. Shatrow, A. D., A. D. Chuprin, and A. N. Sivov, "Constructing the phase converters consisting of arbitrary number of translucent surfaces," IEEE Trans. Antennas Propag., Vol. 43, No. 1, 1995. 15. Lerner, D. S., "A wave polarization converter for circular polarization," IEEE Trans. Antennas Propag., Vol. 15, 3-7, 1964. 16. Marcuvitz, N., Waveguide Handbook, M.I.T. Rad. Lab. Ser., Mc.Graw-Hill, 280-290, 1951. 17. Ulrich, R., "Far-infrared properties of metallic mesh and its complementary structure," Infrared Physics, Vol. 7, 37-50, 1967. 18., , Ansys High Frequency Structure Simulator: www.ansys.com.. 19., , Emerson & Cuming, Microwave Products, http://www.eccosorb.com/.. |