Compact Expressions for Efficiency and Bandwidth of Patch Antennas Over Lossy Magneto-Dielectric Materials

Author

Niamien, Constant ; Collardey, Sylvain ; Sharaiha, Ala ; Mahdjoubi, K.

Author_Institution

Antennas Group, Eur. Univ. of Brittany (UEB), Rennes, France

Volume

10

fYear

2011

fDate

7/3/1905 12:00:00 AM

Firstpage

63

Lastpage

66

Abstract

Closed-form formulas for calculating the radiation efficiency and bandwidth of patch antennas over lossy magneto-dielectric materials are proposed by using the cavity model. These expressions agree well with simulations. It is well known that the bandwidth of microstrip antennas is enhanced when the dielectric substrate is replaced by a magnetic one. Here, we confirm more generally that not only the bandwidth, but also the radiation efficiency, can be improved when the permeability (μ_r) is greater than the permittivity (ε_r).

Keywords

antenna radiation patterns; dielectric materials; magnetic materials; microstrip antennas; permeability; permittivity; cavity model; closed-form formulas; dielectric substrate; lossy magneto-dielectric materials; microstrip antennas; patch antennas; permeability; permittivity; radiation efficiency; Bandwidth; Dielectric losses; Magnetic resonance imaging; Microstrip antennas; Substrates; Antenna miniaturization; cavity model; losses; magneto-dielectrics; radiation efficiency;

fLanguage

English

Journal_Title

Antennas and Wireless Propagation Letters, IEEE

Publisher

ieee

ISSN

1536-1225

Type

jour

DOI

10.1109/LAWP.2011.2107493

Filename

5696732