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Improved Design of an Ultra Wideband Universal Serial Bus Device Mounted Antenna Based on Comparative Radiation Efficiency Measurements

Pires, N. ; Letizia, M. ; Boyes, S. B. ; Lu, Y. L. ; Skrivervik, A. ; Moreira, A. A.

Improved Design of an Ultra Wideband Universal Serial Bus Device Mounted Antenna Based on Comparative Radiation Efficiency Measurements, Proc European Conf. on Antennas & Propagation - EUCAP, Rome, Italy, Vol. --, pp. 1430 - 1434, April, 2011.

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Abstract
The present paper reports a planar, microstrip-fed Ultra Wideband (UWB) monopole antenna designed to operate inside a Universal Serial Bus (USB) dongle. The antenna was dielectrically loaded with a sandwich fabricated in commercial substrate. This design improves on a coaxial fed monopole presented earlier by showing a better matching through the UWB [3.1 - 10.6] GHz band. Wideband efficiency measurements were conducted, using the reverberation chamber technique and a cavity-based approach, called the source-stirred method. The dielectric loading implementation described here has a small impact on antenna radiation efficiency, with the loaded prototype having a figure higher than 78% over the UWB band.