Antennas with artificial magneto-dielectric substrates: the dominant role of frequency dispersion

Author

Ikonen, Pekka ; Maslovski, Stanislav ; Tretyakov, Sergei

Author_Institution

Radio Lab./SMARAD, Helsinki Univ. of Technol., Espoo

fYear

2006

fDate

9-14 July 2006

Firstpage

390

Lastpage

393

Abstract

In this review paper we discuss the impact of frequency dispersion of artificial magneto-dielectric materials designed for antenna applications. The emphasis is on artificial substrates for microstrip antennas, used with the intention to reduce the antenna size or/and improve the impedance bandwidth characteristics. Here we compare the impedance bandwidths of miniaturized resonant antennas loaded with practically realizable, dispersive magneto-dielectric substrates and conventional high-permittivity substrates. Analytical expression is derived for the ratio between the radiation quality factors obtained using these substrates. It is shown that the ratio always exceeds unity, thus, artificial magneto-dielectric substrates offer no advantages in antenna miniaturization. This observation is experimentally validated

Keywords

antenna radiation patterns; dielectric materials; magnetic materials; microstrip antennas; substrates; antenna size reduction; artificial magneto-dielectric substrates; conventional high-permittivity substrates; frequency dispersion; impedance bandwidth characteristics; microstrip antennas; miniaturized resonant antennas; radiation quality factors; Bandwidth; Dielectric substrates; Dispersion; Frequency; Impedance; Loaded antennas; Magnetic analysis; Magnetic materials; Magnetic resonance; Microstrip antennas;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium 2006, IEEE

Conference_Location

Albuquerque, NM

Print_ISBN

1-4244-0123-2

Type

conf

DOI

10.1109/APS.2006.1710540

Filename

1710540