1,721,032 research outputs found
Theoretical and Numerical Analysis of the Resonant Behavior of the Minkowski Fractal Dipole Antenna
No full textOn the Use of Dimension and Lacunarity for Comparing the Resonant Behavior of Convoluted Wire Antennas
No full textFast Iterative Method of Power Synthesis for Antenna Arrays
No full textA fast and simple method of power synthesis for antenna arrays of arbitrary geometry is presented. The method adopts an auxiliary function having the desired amplitude pattern and a generic phase pattern, and determines in closed form the array pattern approximating the auxiliary function in both amplitude and phase. A cost function involving the auxiliary function and the approximating pattern is minimized by modifying the phase pattern of the auxiliary function, using a simple and fast iterative technique. Once the optimal phase pattern has been found, the array pattern approximating the corresponding auxiliary function is the synthesized pattern. The proposed method allows to satisfy stringent requirements on the amplitude pattern, including multibeam synthesis and radiation suppression within large angular regions. Numerical results show the effectiveness of the algorithm and are compared to those obtained using other existing methods. In order to achieve a more significant comparison such methods have been properly modified to improve their performances. Such comparison shows that the presented algorithm allows a significant reduction of CPU time with respect to the other considered methods, as well as a weaker dependence on the starting point. Finally, the presented method is extended in such a way as to reduce the dynamic range ratio (DRR) of the array excitations
A Reliable Approach for Modeling the Actual Antenna Pattern in Millimeter-Wave Communication
Full text linkThis letter presents a mathematical framework for evaluating the link capacity of an interfered communication link in a millimeter-wave mobile scenario, accounting in detail for the shape of the antenna pattern and for the statistic of the direction of arrivals. The developed approach, whose accuracy is verified by Monte Carlo validations in 2D and 3D wireless environments, does not require simplified antenna models, thus enabling to maintain the actual pattern during the analysis
Un algoritmo veloce per la sintesi di potenza di schiere di antenne di geometria arbitraria
No full textFast Co-polar and Cross-Polar 3D Pattern Synthesis with Dynamic Range Ratio Reduction for Conformal Antenna Arrays
No full textThis paper presents a fast method for conformal antenna
arrays that enables the synthesis of 3D co-polar and crosspolar patterns, simultaneously reducing the dynamic range ratio (DRR) of the array excitations. The power synthesis problem is reduced to a field synthesis one by introducing two auxiliary phase patterns: one for the co-polar pattern and the other for the crosspolar pattern. The problem is then iteratively solved with respect to the two auxiliary phase patterns and to the array excitations. A modified version of the method is also proposed, for the particular case where the DRR reduction is not required, obtaining a further strong reduction of the computational time
Throughput and delay analysis of 802.11-based wireless networks using smart and directional antennas
No full textThis paper proposes a mathematical framework for comparing the performance of wireless networks based on the IEEE 802.11 standard, employing switched-beam, directional and adaptive antennas. The analysis adopts detailed models for the antenna system behavior and the propagation environment, taking into account multipath and interference. The purpose of this study is to determine the number of simultaneous communications that may be sustained by adopting advanced antenna systems, and to investigate, by analysis and simulation, the resulting performance improvements, in terms of throughput and packet delay. Both saturated and non-saturated traffic conditions are treated. Suitable 802.11 Medium Access Control (MAC) layer parameter settings, able to exploit smart and directional antenna capabilities for maximizing the throughput, are also discussed
Multi-beam synthesis with null constraints by phase control for antenna arrays of arbitrary geometry
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