Impact of Ultra Wide-Band Antennas on Communications in a Spatial Channel
Mohamed El-Hadidy, Thomas Kaiser
1st International Conference on Cognitive Radio Oriented Wireless Networks and Communications, 2006.
8-10 June 2006
Ultra-wideband, MIMO, Ultra-wideband antennas, Ultra-wideband channel model, Ray-traching
Aim of this contribution is to study the impact of typical ultra-wideband (UWB) antennas for communications over a spatial wireless channel. In order to adequately consider the directivity properties of real antennas, our analysis is suitably based on a ray tracing UWB channel model since this reflects the dependence on the Angle of Arrival (AoA) and Angle of Departure (AoD) of any multipath. A mathematical framework is given which also allows an optimization of such an UWB Multiple Input Multiple Output (MIMO) system using
different types of transmitting and receiving antennas on behalf of idealistic omnidirectional ones. Beside the angle dependence, the antenna transfer functions are without doubt frequency dependent on such a large UWB bandwidth, so that they will be evaluated with suitable analog design specialized tools for the fast and accurate threedimensional electromagnetic simulation of high frequency circuits. Simulation results allowing concrete guidelines on the antenna influence will be provided in the last section of this paper.
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