Physics – Classical Physics
Scientific paper
2005-09-16
IEEE Trans. Antennas Propag., vol. 54, no. 6, pp. 1654-1662, 2006.
Physics
Classical Physics
22 pages, 14 figures, 5 tables, submitted to IEEE Trans. Antennas Propagat
Scientific paper
10.1109/TAP.2006.875912
In the present paper we discuss the effect of artificial magneto-dielectric substrates on the impedance bandwidth properties of microstrip antennas. The results found in the literature for antenna miniaturization using magnetic or magneto-dielectric substrates are revised, and discussion is addressed to the practically realizable artificial magnetic media operating in the microwave regime. Using a transmission-line model we, first, reproduce the known results for antenna miniaturization with non-dispersive material fillings. Next, a realistic dispersive behavior of a practically realizable artificial substrate is embedded into the model, and we show that frequency dispersion of the substrate plays a very important role in the impedance bandwidth characteristics of the loaded antenna. The impedance bandwidths of reduced size patch antennas loaded with dispersive magneto-dielectric substrates and high-permittivity substrates are compared. It is shown that unlike substrates with dispersion-free permeability, practically realizable artificial substrates with dispersive magnetic permeability are not advantageous in antenna miniaturization. This conclusion is experimentally validated.
Ikonen Pekka
Maslovski Stanislav
Simovski Constantin
Tretyakov Sergei
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