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Title: Frequency switching of electrically small patch antenna using metamaterial loading
Authors: Joshi, J G
Pattnaik, Shyam S
Devi, S
Lohokare, M R
Keywords: Electrically small antenna (ESA);Planar metamaterial;Negative permeability metamaterial;Spilt ring resonator (SRR);Frequency switchable metamaterial loaded small antenna
Issue Date: Jun-2011
Publisher: NISCAIR-CSIR, India
PACS No.: 84.40.Ba
Abstract: A frequency switchable planar metamaterial loaded electrically small microstrip patch antenna, capable of resonating at different frequencies by varying the loading distance, has been presented in this paper. The rectangular microstrip patch antenna is loaded with planar metamaterial square spilt ring resonators (SRRs) in three different configurations at a distance of 0.25, 0.50 and 0.75 mm, respectively to get the switchable resonant frequency performance. The square SRRs reveals negative permeability () presenting the single negative metamaterial (SNG) characteristics. The unloaded rectangular microstrip patch antenna resonates at 23 GHz. In loading condition at different distances, the rectangular microstrip patch antenna resonates at 9.61, 9.51 and 9.41 GHz, respectively. Using Chu limit, size of the antenna, that is ka, reaches 0.766, 0.775 and 0.787 in respective configurations, thus, satisfies the condition ka <1 for electrically small antenna. The resonant frequency of rectangular microstrip patch antenna decreases with respect to the loading distance due to magnetic coupling. As the loading distance gets reduced, the mutual inductance increases resulting in enhancement of the bandwidth of the antenna. In these three loading conditions, the radiation quality factor (Qrad) is larger than the minimum Q that is Qchu. The directivity is more than 7.50 dBi in the presented configurations of electrically small rectangular microstrip patch antenna.
Page(s): 159-165
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.40(3) [June 2011]

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