Zobrazeno 1 - 10
of 585
pro vyhledávání: '"Jelínek L"'
A general framework for determining fundamental bounds in nanophotonics is introduced in this paper. The theory is based on convex optimization of dual problems constructed from operators generated by electromagnetic integral equations. The optimized
Externí odkaz:
http://arxiv.org/abs/1912.06699
Autor:
Ourednik, P., Jelinek, L.
A capacitor paradox is an electromagnetic problem designed to show the limits of circuit theory which considers the connection of two ideal capacitors, one charged and the second discharged. A blind solution to this problem leads to the non-conservat
Externí odkaz:
http://arxiv.org/abs/1806.11507
Publikováno v:
IEEE Transactions on Antennas and Propagation 66, pp. 6716 - 6723, 2018
Existing optimization methods are used to calculate the upper-bounds on radiation efficiency with and without the constraint on self-resonance. These bounds are used for the design and assessment of small electric-dipole-type antennas. We demonstrate
Externí odkaz:
http://arxiv.org/abs/1712.02613
Ambiguities in the definition of stored energy within distributed or radiating electromagnetic systems motivate the discussion of the well-defined concept of recoverable energy. This concept is commonly overlooked by the community and the purpose of
Externí odkaz:
http://arxiv.org/abs/1701.06313
Publikováno v:
IET Microwaves, Antennas & Propagation, 11, pp. 852-858, 2017
A full-wave numerical scheme of polarisability tensors evaluation is presented. The method accepts highly conducting bodies of arbitrary shape and explicitly accounts for the radiation as well as ohmic losses. The method is verified on canonical bodi
Externí odkaz:
http://arxiv.org/abs/1609.03699
Autor:
Jelinek, L., Capek, M.
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 $G$, quality factor $Q$, gain to quality factor ratio $G/Q$, and r
Externí odkaz:
http://arxiv.org/abs/1602.05520
Publikováno v:
Phys. Rev. B 90, 104413 (2014)
Artificial diamagnetics are prominent for achieving extraordinarily strong diamagnetism in a wide frequency range. However, as far as the magnetic fields outside the artificial medium are concerned, bulk conductors show a very similar pattern. The qu
Externí odkaz:
http://arxiv.org/abs/1406.5643
Publikováno v:
IET Microwaves, Antennas & Propagation, Vol. 9, pp. 1096-1103, 2015
This paper describes an analytical evaluation of the quality factor Qz in a separable system in which the vector potential is known. The proposed method uses a potential definition of active and reactive power, implicitly avoiding infinite entire spa
Externí odkaz:
http://arxiv.org/abs/1311.1750
Publikováno v:
IEEE T. Antenn. Propag., Vol. 62, 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) with expressions based solely on the current distribution on a
Externí odkaz:
http://arxiv.org/abs/1309.6122
Publikováno v:
Photonics and Nanostructures - Fundamentals and Applications 12, pp. 9-15, 2014
The analogy between electromagnetic waves and ballistic electrons within the Kane's model is developed and subsequently applied to a theoretical description of a quantum version of a metamaterial planar lens. Restrictions imposed on the perfect lens
Externí odkaz:
http://arxiv.org/abs/1307.5500