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Národní úložiště šedé literatury Nalezeno 2 záznamů.  Hledání trvalo 0.01 vteřin. 
Perforated Dielectrics and Higher-Order Mode Dielectric Resonator Antennas
 Mrnka, Michal ; Bonefačić, Davor (oponent) ; Mrozowski, Michal (oponent) ; Raida, Zbyněk (vedoucí práce)
The thesis deals with the excitation of higher-order modes in the rectangular and cylindrical dielectric resonator antennas for gain enhancement purpose. The properties and limitations of the antenna elements are studied numerically. Mutual coupling between the higher-order mode dielectric resonators is examined and the results prove the elements to be suitable for antenna array applications. For perforated dielectrics, an analytical model of effective permittivity that respects its anisotropic properties is proposed. The model is based on the Maxwell Garnett approximation of inhomogeneous media. Surface waves on perforated substrates are then studied and the validity of the analytical model is verified also in this case. The dielectric resonator antennas embedded in perforated substrates are studied and certain degradations in antenna properties are pointed out.
Úplný záznam
Perforated Dielectrics and Higher-Order Mode Dielectric Resonator Antennas
 Mrnka, Michal ; Bonefačić, Davor (oponent) ; Mrozowski, Michal (oponent) ; Raida, Zbyněk (vedoucí práce)
The thesis deals with the excitation of higher-order modes in the rectangular and cylindrical dielectric resonator antennas for gain enhancement purpose. The properties and limitations of the antenna elements are studied numerically. Mutual coupling between the higher-order mode dielectric resonators is examined and the results prove the elements to be suitable for antenna array applications. For perforated dielectrics, an analytical model of effective permittivity that respects its anisotropic properties is proposed. The model is based on the Maxwell Garnett approximation of inhomogeneous media. Surface waves on perforated substrates are then studied and the validity of the analytical model is verified also in this case. The dielectric resonator antennas embedded in perforated substrates are studied and certain degradations in antenna properties are pointed out.
Úplný záznam

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