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 material with the appropriate thicknesses (Quarter-Wave Plates).An interesting alternative solution consists of designing planar metallic grids with sub-wavelength geometries that exhibits different behaviour along two orthogonal axes.In this work we present a broadband dielectrically embedded quasi-optical polariser built using photolithographic techniques.The device was experimentally tested using a Vector Network Analyser working in W-band (75-110 GHz).The presented results are in excellent agreement with finite-element analysis simulations: across a 30% bandwidth the transmission along the two axes and the very flat differential phase-shift are respectively: T C = 0:92, T L= 0:95 and Δ℘LC = 89:3 ± 1:5°.

A broadband photolithographic polariser for millimetre wave applications / Pisano, G.; Ng, M. W.; Haynes, V.; Maffei, B.. - (2012), pp. 1748-1751. (Intervento presentato al convegno Progress in Electromagnetics Research Symposium, PIERS 2012 Kuala Lumpur tenutosi a Kuala Lumpur, mys).

A broadband photolithographic polariser for millimetre wave applications

Pisano G.;
2012

Abstract

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 material with the appropriate thicknesses (Quarter-Wave Plates).An interesting alternative solution consists of designing planar metallic grids with sub-wavelength geometries that exhibits different behaviour along two orthogonal axes.In this work we present a broadband dielectrically embedded quasi-optical polariser built using photolithographic techniques.The device was experimentally tested using a Vector Network Analyser working in W-band (75-110 GHz).The presented results are in excellent agreement with finite-element analysis simulations: across a 30% bandwidth the transmission along the two axes and the very flat differential phase-shift are respectively: T C = 0:92, T L= 0:95 and Δ℘LC = 89:3 ± 1:5°.
2012
Progress in Electromagnetics Research Symposium, PIERS 2012 Kuala Lumpur
Polarimetry, millimetre wave astronomy, instrumentation, retarders
04 Pubblicazione in atti di convegno::04b Atto di convegno in volume
A broadband photolithographic polariser for millimetre wave applications / Pisano, G.; Ng, M. W.; Haynes, V.; Maffei, B.. - (2012), pp. 1748-1751. (Intervento presentato al convegno Progress in Electromagnetics Research Symposium, PIERS 2012 Kuala Lumpur tenutosi a Kuala Lumpur, mys).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1585650
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