A new printed monopole antenna configuration, asymmetric inverted cone ring monopole antenna, is proposed. The proposed antenna which has the size of 23.6 mm × 40 mm, is fabricated on a lowcost FR4 substrate that has the relative permittivity (ε r) of 4.4 and substrate thickness of 1.6 mm to operate in the UWB band (3.1 GHz to 10.6 GHz) released by Federal Communications Commission (FCC) in 2002. It gives an ultra-wide impedance bandwidth of VSWR ≤ 2 from 2.9 GHz to 35 GHz (169.4%) for numerical result and from 3.1 GHz to 31.1 GHz (163.74%) for experimental result. Moreover, it exhibits omni-directional radiation patterns with acceptable gain across the whole operation band, which meets the requirements of UWB applications. The parameters which affect the performance of the antenna characteristics are investigated in this paper. The simulated results have a good agreement with the measured ones, and the proposed antenna shows that it is a very good candidate for UWB operations.
In narrowband communication system, the presence of interference and noise are normally modeled by Gaussian distribution. However, it is not always the case for broadband signals. In this paper, we study the statistical distribution of a singleuser Ultra Wideband system in the presence of intersymbol interference and the additive white Gaussian noise. Simulated distribution model has been done by collecting the data of the conditional probability density function at the receiver output. Results show that the Middleton ClassA distribution model is more preferable in the presence of lineofsight path, but not in nonlineofsight path.
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