1,721,020 research outputs found
Talking About ‘International Sovereignty’: A Comparative Analysis of the Identity and Democracy Parties Campaigning in the 2019 European Elections
No full textThe chapter is focused on a comparative analysis of the electoral campaigns of political parties belonging to EU Parliament Group Identity and Democracy in the 2019 EU Elections with the aim of identifying the similarities and common elements capable of identifying a communication strategy that can be used as a model for talking about “international sovereignty”. The results show that each political party maintains its own communication strategy, and the attempt to create a campaign more focused on the ID Group than on individual parties seems to have failed. Even if the ID parties’ campaigns present several similarities, such as the issues most covered, the constant appeal to the people which characterizes the populist dimension of the group, the negative representation of EU, the central role of immigration issues which define the type of right-wing populist narratives, the direct contact with the electorate through the social media, the use of highly polarised language and negative campaigning that are typical characteristics of digital populism, the attempt to create a campaign more focused on the group than on individual parties, as claimed in the two Milan initiatives by Matteo Salvini and Marine Le Pen, seems not to have become real. The interaction between some of the leaders and the relevant use of the web seems to be the only traits relating to the transnational trends of the ID group. The analysis conducted outlines similarities and common elements capable of identifying a communication strategy that can be used as a model for talking about international sovereignty, but the common goal to build electoral consensus for a Europe of nations is pursued by political forces largely independently, focusing on national election campaigns in line with their sovereign and nationalist character
Analysis and design of wide-band matched waveguide bends including discontinuities
No full textWaveguide bends with small radii of curvature are realized by using properly selected discontinuities which, placed inside the curve, allow low return losses to be achieved over large band-widths. The component is designed by using an efficient computer code which employs the focal modes approach to analyze curved sections, while discontinuities are rigorously accounted for by considering their accessible modes. Theoretical simulations are compared with experimental results showing very good accurac
Gains Maximization for Two-port WPT Links with Three Coils
No full textIn this paper a two-port network for wireless power transfer realized with three coils is considered. Usually, these networks are analyzed assuming that one of the three mutual couplings is negligible. However, this hypothesis is not always applicable, there are specific configurations for which no coupling can be neglected. Accordingly, in this paper the optimal terminating impedances are derived for the general case where all the couplings are taken into account. The performance of the network are described by using the three power gains (available, power, transducer gains). Analytical formulas and circuital simulations are reported and discussed
Efficient CAD of wideband contiguous channel multiplexers1996 IEEE MTT-S International Microwave Symposium Digest
No full textA systematic procedure for the efficient CAD of multiplexers is presented and applied to the design of wideband contiguous channel multiplexers using manifolds consisting of interconnected Y-junctions. The procedure starts by connecting N separately designed filters to the manifold at appropriate distances. All parameters are then optimized by computing the multiplexers sensitivities by the Adjoint Network Method (ANM). The latter is specialized to account for the multiplexer topology. Moreover the ANM is applied to the optimization of both the prototype and the final component. The proposed algorithm takes advantage of the efficiency of the ANM, while also reducing code complexity and memory resource
On the Use of Matching Networks and Relays for Maximizing the Gains of IR WPT Links
No full textThis paper analyzes the problem of maximizing the gains of a single transmitter-single receiver inductive resonant Wireless Power Transfer link (WPT). Two different approaches are considered and compared: the use of impedance matching networks and the use of additional resonators (relay elements). It is shown that, if from a theoretical point of view the two approaches are equivalent, in some practical cases the maximization of the gains by means of relays may not be feasible
Measurements for Wireless Power Transfer by Using NanoVNA
No full textThis paper suggests the use of Nano VNAs (Vector Network Analyzers) as a practical and cost-effective alternative to standard VNAs for the characterization of WPT links operating at low frequencies. Experimental data for a link operating at 7 MHz are reported and compared with those obtained through a standard VNA, thus demonstrating the good accuracy achievable with Nano VNAs
Maxwell's Equations and Potentials in Dirac form using Geometric Algebra
No full textThe basis for engineering electromagnetic computations still relies on Gibbs' vector algebra. It is well known that Clifford algebra (geometric algebra) presents several enhancement on the latter. In this paper it is shown that Maxwell's equations can be cast in a form similar to Dirac equation by using spinors. Additionally, a similar relation is derived for the fields and the potentials. It is also shown that, as a consequence of using the geometric algebra approach, the Lorenz gauge comes naturally from the grade structure
Direct analytical solution of iris discontinuities in waveguide by separation of variables
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