DocumentCode :
3489882
Title :
Numerical simulations of patch antennas with stacked split-ring resonators as artificial magnetic substrates
Author :
Kärkkäinen, Mikko ; Ermutlu, Murat ; Maslovski, Stanislav ; Ikonen, Pekka ; Tretyakov, Sergei
Author_Institution :
Dept. of Electr. & Commun. Eng., Helsinki Univ. of Technol., Espoo, Finland
fYear :
2005
fDate :
7-9 March 2005
Firstpage :
395
Lastpage :
398
Abstract :
Analytical studies have established that magnetic material substrates of patch antennas at microwave frequencies would reduce the resonant frequency of the antenna while essentially retaining the relative bandwidth. However, readily available magnetic materials exhibit high losses at microwave frequencies, which severely limits their applications at frequencies higher than about 1 GHz. Densely packed split-ring resonators have been recently proposed for microwave applications. In this work, densely packed arrays of split-ring resonators (SRR) are used as an artificial magnetic substrate to reduce the resonant frequency of a patch antenna. The SRR stacks embedded into a dielectric medium constitute an anisotropic magneto-dielectric substrate, allowing a considerable reduction of the resonant frequency of the antenna, while approximately preserving the relative bandwidth. Different configurations of the material are studied numerically using the finite-difference time-domain (FDTD) method.
Keywords :
anisotropic media; circuit resonance; finite difference time-domain analysis; magnetic materials; microstrip antennas; periodic structures; resonators; FDTD; anisotropic magneto-dielectric substrate; antenna resonant frequency reduction; artificial magnetic material substrates; densely packed SRR arrays; dielectric medium embedded SRR stacks; microwave frequency material losses; patch antennas; relative bandwidth; stacked split-ring resonators; uniaxially anisotropic artificial magnetic material; Bandwidth; Dielectric substrates; Magnetic anisotropy; Magnetic materials; Magnetic resonance; Microwave frequencies; Numerical simulation; Patch antennas; Perpendicular magnetic anisotropy; Resonant frequency;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Antenna Technology: Small Antennas and Novel Metamaterials, 2005. IWAT 2005. IEEE International Workshop on
Print_ISBN :
0-7803-8842-9
Type :
conf
DOI :
10.1109/IWAT.2005.1461100
Filename :
1461100
Link To Document :
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