1,720,974 research outputs found

    Analysis of Non-Linearly Loaded Antennas and Scatterers

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    A very efficient numerical technique for the analysis of non-line arly loaded antennas and scatterers is proposed. It is based on a generalization of the piecewise harmonic balance method, which overcomes the need to examine the complete transient development in the time domain. The algorithm enables the analysis of multiport nonlinearities expressed even in implicit form and appears to be extremely useful even with strong nonlinearities. This approach is found to be highly recommended for applications which only require the steady-state responses such as co-operative targets and environmental measurement techniques. An example of application is given

    Physics-based electron device modelling and computer-aided MMIC design

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    On overview on the state of the art and future trends in physics-based electron device modelling for the computer-aided design of monolithic microwave ICs is provided. After a review of the main physics-based approaches to microwave modeling, special emphasis is placed on innovative developments relevant to circuit-oriented device performance assessment, such as efficient physics-based noise and parametric sensitivity analysis. The use of state-of-the-art physics-based analytical or numerical models for circuit analysis is discussed, with particular attention to the role of intermediate behavioral models in linking multidimensional device simulators with circuit analysis tools. Finally, the model requirements for yield-driven MMIC design are discussed, with the aim of pointing out the advantages of physics-based statistical device modeling; the possible use of computationally efficient approaches based on device sensitivity analysis for yield optimization is also considered

    Going Beyond Counting First Authors in Author Co-citation Analysis

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    The present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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