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A broadband photolithographic polariser for millimetre wave applications

Pisano, Giampaolo, Ng, M. W., Haynes, V. and Maffei, B. 2012. A broadband photolithographic polariser for millimetre wave applications. Presented at: PIERS 2012, Kuala Lumpur, Malaysia, 27-30 March 2012. PIERS Proceedings 2012. The Electromagnetics Academy, pp. 1747-1751.

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Circular polarisers are used to convert linear- into circular-polarisation, and vice versa. This is achieved by introducing a phase-shift of 90± between two orthogonal polarisations passing through the device. These devices can be designed using slabs of birefringent mate- rial with the appropriate thicknesses (Quarter-Wave Plates). An interesting alternative solution consists of designing planar metallic grids with sub-wavelength geometries that exhibits di®er- ent behaviour along two orthogonal axes. In this work we present a broadband dielectrically embedded quasi-optical polariser built using photolithographic techniques. The device was ex- perimentally tested using a Vector Network Analyser working in W-band (75{110 GHz). The presented results are in excellent agreement with ¯nite-element analysis simulations: across a 30% bandwidth the transmission along the two axes and the very °at di®erential phase-shift are respectively: TC = 0:92, TL = 0:95 and ¢'LC = 89:3 § 1:5±

Item Type: Conference or Workshop Item (Paper)
Date Type: Submission
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: The Electromagnetics Academy
ISBN: 9781934142202
ISSN: 1559-9450
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Last Modified: 04 Jun 2017 06:35

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