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New expressions for calculating of the quality factor QZ are presented. The resulting relations link QZ, based on the frequency change of the input impedance at the input port, with expressions based solely on the current distribution on a radiator. The derivation is based on electromagnetic potentials, automatically eliminating all divergent integrals associated with electromagnetic energies in infinite...
This paper describes an analytical evaluation of the measurable quality factor QZ of a system in which the vector potential is known. The method is presented on a canonical example of the currents flowing on a spherical shell, which leads to the analytical prescription for the lower bound of QZ.
Complex in-house tool for calculation of characteristic modes has been shortly introduced. Then some bottlenecks were identified and modified into parallel and distributive computing mode. One example has been completely adapted to GPU device. Preliminary tests show that practical parallel programing in Matlab is easy and very effective. Further development will be aimed to utilization more than one...
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