Berlin 2015 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 16: Focused Session on GHz Dielectrics: Materials for Mobile Communication I (DF with HL/MM)

DF 16.5: Topical Talk

Thursday, March 19, 2015, 11:00–11:30, EB 407

Dielectric-loaded antennas for circular polarisation: their contribution to the information capacity of wireless terminals — •Oliver Leisten — Maruwa Europe Ltd, UK

Dielectric-loaded multi-filar helix antennas offer solutions as miniature circular polarised antennas in small devices with the advantage that body-loading can suppress reflections from the device: improving circular polarisation discrimination. This is an example of materials-science enabling the design of antennas providing relatively predictable performance in a cluttered and changing near environment. Modern wireless systems typically operate with complex scattering from objects in the indoor environment which can be scaled in frequency to be compared to the Rayleigh scattering of light from the particles of dense smoke. Indeed modern MIMO devices exploit the low spatial autocorrelation of such fields invoking the principle of spatial multiplexing to multiply the information capacity per unit of spectral bandwidth. Such systems use multiple receiving antennas to receive scattered signals summing by superposition, at those discrete antenna locations, of information streams transmitted from multiple transmitting antennas. The small resonance volume dielectric-loaded antennas, together with platform independent polarisation, enhances statistical independence of signals, improving system data-capacity by reducing interference between data-streams. The use of right and left hand circular polarised antennas to invoke polarisation diversity is interesting as Rayleigh scattering develops spin-turbulent fields.