Frequency switching of electrically small patch antenna using metamaterial loading

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 ri...

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Published in:Indian journal of radio & space physics 2011-06, Vol.40 (3), p.159-165
Main Authors: Joshi, J G, Pattnaik, S S, Devi, S, Lohokare, M R
Format: Article
Language:English
Subjects:
Antennas
Directivity
Indian
Inductance
Metamaterials
Patch antennas
Quality factor
Resonant frequencies
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creator Joshi, J G
Pattnaik, S S
Devi, S
Lohokare, M R
description 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 ( mu ) 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
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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 (Q sub(rad)) is larger than the minimum Q that is Q sub(chu). 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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 (Q sub(rad)) is larger than the minimum Q that is Q sub(chu). The directivity is more than 7.50 dBi in the presented configurations of electrically small rectangular microstrip patch antenna.</abstract><tpages>7</tpages></addata></record>
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source Freely Accessible Science Journals - check A-Z of ejournals
subjects Antennas
Directivity
Indian
Inductance
Metamaterials
Patch antennas
Quality factor
Resonant frequencies
title Frequency switching of electrically small patch antenna using metamaterial loading
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