Zobrazeno 1 - 10
of 113
pro vyhledávání: '"Čapek, Miloslav"'
This paper introduces a framework for synthesizing reactively loaded antennas and antenna arrays. The framework comprises two main components: computing the fundamental bound using the semi-definite relaxation and finding a realizable solution via op
Externí odkaz:
http://arxiv.org/abs/2409.06291
This paper introduces a computational approach to identify performance constraints in the time-domain based on optimizing the excitation waveform. The method builds on an optimization algorithm that has been employed for decades to establish fundamen
Externí odkaz:
http://arxiv.org/abs/2409.16293
Autor:
Kadlec, Petr, Capek, Miloslav
This paper describes the modification of a single-objective algorithm into its multi-objective counterpart. The outcome is a considerable increase in speed in the order of tens to hundreds and the resulting Pareto front is of higher quality compared
Externí odkaz:
http://arxiv.org/abs/2409.14245
The problem of substructure characteristic modes is developed using a scattering matrix-based formulation, generalizing subregion characteristic mode decomposition to arbitrary computational tools. It is shown that the modes of the scattering formula
Externí odkaz:
http://arxiv.org/abs/2403.00792
We use the concept of active antenna available power to derive a generalization of the Friis transmission formula for multiport antenna systems. With beamformer weights chosen such that the array patterns are the same when transmitting and receiving,
Externí odkaz:
http://arxiv.org/abs/2401.13775
Autor:
Wingren, Niklas, Sjöberg, Daniel, Gustafsson, Mats, Lundgren, Johan, Capek, Miloslav, Jelinek, Lukas, Schab, Kurt
The scattering formulation of characteristic mode decomposition is utilized to extend modal analysis to lossless scatterers breaking time-reversal symmetry. This enables characteristic modes analysis on devices containing gyrotropic or moving media.
Externí odkaz:
http://arxiv.org/abs/2312.14554
Autor:
Schab, Kurt, Chen, Frederick, Jelinek, Lukas, Capek, Miloslav, Lundgren, Johan, Gustafsson, Mats
Characteristic modes of arbitrary two-dimensional periodic systems are analyzed using scattering parameter data. This approach bypasses the need for periodic integral equations and allows for characteristic modes to be computed from generic simulatio
Externí odkaz:
http://arxiv.org/abs/2310.06004
Autor:
Liska, Jakub, Gao, Mingxiang, Jelinek, Lukas, Algarp, Erik R., Skrivervik, Anja K., Capek, Miloslav
Performance limitations for implanted antennas, taking radiation efficiency as the metric, are presented. The performance limitations use a convex optimization procedure with the current density inside the implant acting as its degree of freedom. The
Externí odkaz:
http://arxiv.org/abs/2307.16466
This paper introduces a theory for assessing and optimizing the multiple-input-multiple-output performance of multi-port cluster antennas in terms of efficiency, channel correlation, and power distribution. A method based on a convex optimization of
Externí odkaz:
http://arxiv.org/abs/2305.01416
Classical gradient-based density topology optimization is adapted for method-of-moments numerical modeling to design a conductor-based system attaining the minimal antenna Q-factor evaluated via an energy stored operator. Standard topology optimizati
Externí odkaz:
http://arxiv.org/abs/2303.15290