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- Miloslav Capek, LukÃ¡s JelÃnek, Pavel Hazdra, Jan Eichler
- IEEE Transactions on Antennas and Propagation
- 2014

New expressions are derived to calculate the Q factor of a radiating device. The resulting relations link Q based on the frequency change of the input impedance at the input port (QX, QZ) withâ€¦ (More)

- Miloslav Capek, LukÃ¡s JelÃnek
- IEEE Transactions on Antennas and Propagation
- 2016

This paper describes a powerful, yet simple, procedure how to acquire a current approaching the lower bound of quality factor Q. This optimal current can be determined for an arbitrarily shapedâ€¦ (More)

- Miloslav Capek, Mats G. Gustafsson, Kurt R. Schab
- IEEE Transactions on Antennas and Propagation
- 2017

Optimal currents on arbitrarily shaped radiators with respect to the minimum quality factor are found using a simple and efficient procedure. The solution starts with a reformulation of the problemâ€¦ (More)

- LukÃ¡s JelÃnek, Miloslav Capek
- IEEE Transactions on Antennas and Propagation
- 2017

An optimization problem has been formulated to find a resonant current extremizing various antenna parameters. The method is presented on, but not limited to, particular cases of gain G, qualityâ€¦ (More)

- Miloslav Capek, LukÃ¡s JelÃnek, Guy A. E. Vandenbosch
- Proceedings. Mathematical, physical, andâ€¦
- 2016

This paper deals with the old yet unsolved problem of defining and evaluating the stored electromagnetic energy-a quantity essential for calculating the quality factor, which reflects the intrinsicâ€¦ (More)

- Miloslav Capek, LukÃ¡s JelÃnek, Pavel Hazdra
- IEEE Transactions on Antennas and Propagation
- 2015

The functional relation between the fractional bandwidth and the quality factor of a radiating system is investigated in this communication. Several widely used definitions of the quality factor areâ€¦ (More)

- Miloslav Capek, Pavel Hazdra, Michal MaÅ¡ek, Vit Losenicky
- IEEE Transactions on Antennas and Propagation
- 2017

Aspects of the theory of characteristic modes (CMs), based on their variational formulation, are presented and an explicit form of a related functional, involving only currents in a spatial domain,â€¦ (More)

- Pavel Hazdra, Miloslav Capek, Jan Eichler, Milos Mazanek
- IEEE Antennas and Wireless Propagation Letters
- 2014

Closed-form equations are given for radiation quality factor of a thin-wire Î»/2 dipole above an infinite electric ground plane. Particular results of interest include a simple formula for a smallâ€¦ (More)

- Miloslav Capek, Vit Losenicky, LukÃ¡s JelÃnek, Mats G. Gustafsson
- IEEE Transactions on Antennas and Propagation
- 2017

Characteristic modes (CMs) of a spherical shell are found analytically as spherical harmonics normalized to radiate unitary power and to fulfill specific boundary conditions. The presentedâ€¦ (More)

- Pavel Hazdra, Miloslav Capek, Pavel Hamouz, Milos Mazanek
- 2010 Conference Proceedings ICECom, 20thâ€¦
- 2010

This paper shows the advantage of modal methods utilization in the area of microstrip patch antennas design. Namely, the Theory of Characteristic Modes (TCM) is developed starting from the Electricâ€¦ (More)