About: The Measurable Q Factor and Observable Energies of Radiating Structures

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://ieeexplore.ieee.org
Description	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 an radiating device. The question of which energies of a radiating system are observable is reviewed, and then the proposed Q factor as defined in this paper is physical. The derivation is based on potential theory rather than fields. This approach hence automatically eliminates all divergent integrals associated with electromagnetic energies in infinite space. The new formulas allow us to study the radiation Q factor for antennas without feeding (through e.g. Characteristic Modes) as well as fed by an arbitrary number of ports. The new technique can easily be implemented in any numerical software dealing with current densities. To present the merits of proposed technique, three canonical antennas are studied. Numerical examples show excellent agreement between the measurable QZ derived from input impedance and the new expressions. 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 an radiating device. The question of which energies of a radiating system are observable is reviewed, and then the proposed Q factor as defined in this paper is physical. The derivation is based on potential theory rather than fields. This approach hence automatically eliminates all divergent integrals associated with electromagnetic energies in infinite space. The new formulas allow us to study the radiation Q factor for antennas without feeding (through e.g. Characteristic Modes) as well as fed by an arbitrary number of ports. The new technique can easily be implemented in any numerical software dealing with current densities. To present the merits of proposed technique, three canonical antennas are studied. Numerical examples show excellent agreement between the measurable QZ derived from input impedance and the new expressions. (en)
Title	The Measurable Q Factor and Observable Energies of Radiating Structures The Measurable Q Factor and Observable Energies of Radiating Structures (en)
skos:prefLabel	The Measurable Q Factor and Observable Energies of Radiating Structures The Measurable Q Factor and Observable Energies of Radiating Structures (en)
skos:notation	RIV/68407700:21230/14:00208988!RIV15-MSM-21230___
http://linked.open...avai/riv/aktivita	P S
http://linked.open...avai/riv/aktivity	P(GA13-09086S), S
http://linked.open...iv/cisloPeriodika	1
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Jelínek, Lukáš Eichler, Jan Čapek, Miloslav Hazdra, Pavel
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	České vysoké učení technické v Praze / Fakulta elektrotechnická
http://linked.open...dnocenehoVysledku	27740
http://linked.open...ai/riv/idVysledku	RIV/68407700:21230/14:00208988
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Antenna theory; electromagnetic theory; Poynting theorem; Q factor (en)
http://linked.open.../riv/klicoveSlovo	Antenna theory Poynting theorem electromagnetic theory Q factor
http://linked.open...odStatuVydavatele	US - Spojené státy americké
http://linked.open...ontrolniKodProRIV	[2F90DE4C96B4]
http://linked.open...i/riv/nazevZdroje	IEEE Transactions on Antennas and Propagation
http://linked.open...in/vavai/riv/obor	JA
http://linked.open...ichTvurcuVysledku	4 (xsd:int)
http://linked.open...cetTvurcuVysledku	4 (xsd:int)
http://linked.open...vavai/riv/projekt	Výzkum umělých elektromagnetických materiálů a metamateriálů s užitými numerickými a zobrazovacími metodami
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	62
http://linked.open...iv/tvurceVysledku	Eichler, Jan Hazdra, Pavel Jelínek, Lukáš Čapek, Miloslav
http://linked.open...ain/vavai/riv/wos	000329516700036
issn	0018-926X
number of pages	8 (xsd:int)
http://bibframe.org/vocab/doi	10.1109/TAP.2013.2287519
http://localhost/t...ganizacniJednotka	21230

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