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An Ultra-Wideband Dielectric Rod Antenna Fed by a Planar Circular Slot

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3 Author(s)
Leib, M. ; EADS Deutschland GmbH, Ulm, Germany ; Vollmer, A. ; Menzel, W.

A novel ultra-wideband (UWB) dielectric rod antenna fed by a planar structure is presented. The planar structure consists of a circular slot antenna supplied by a dipole. This planar antenna excites the HE11 mode of an attached circular dielectric rod. Due to this combination, a broadband and low-dispersive overall antenna performance is achieved. Furthermore, an additional reflector at the backside of the antenna increases the directivity. With this configuration, a return loss better than 10 dB from 3.5 to 11.8 GHz is achieved with a nearly constant gain and a mean gain of 8.7 dBi. Beside the standard characterization, the system performance of the antenna is evaluated by means of the fidelity factor calculated from time-domain measurements and applying a UWB impulse generator.

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:59 ,  Issue: 4 )