Indian Journal of Science and Technology

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Metamaterial Loaded Frequency Tunable Electrically Small Planar Patch Antenna


Affiliations
1 Department of Electronics & Communication Engineering, Gurukul Kangri University, Haridwar, India
2 Department of Electronics & Communication Engineering, DIT, Dehradun, India
3 Department of ETV, NITTTR, Sector-26, Chandigarh, India
 

In this paper, we present a metamaterial loaded frequency tunable electrically small planar patch antenna. Metamaterial structure has square shaped split ring resonator (SRR) with micro-splits. Frequency tunability is achieved by using RF MEMS switches. By making RF MEMS switches ON/OFF, the reactance of SRR structure changes and thus frequency of antenna is controlled. The patch antenna resonates at 27 GHz. But when the patch antenna is loaded with SRR structure, the loaded antenna is tuned to 9.02GHz, 9.08 GHz and 9.16 GHz by making RF MEMS switches ON/OFF. The resonant frequency of loaded antenna increases because as additional micro-splits are incorporated, series capacitances are introduced in SRR which decreases the overall capacitance of SRR. In all cases the loaded antenna satisfies the condition, Chu limit ka < 1, for an antenna to be electrically small. Also there is no requirement of additional matching networks.

Keywords

Chu Limit, Electrically Small Antenna, RF MEMS Switch, Micro-splits, Single Negative Material (SNG) Split Ring Resonator (SRR), Negative Mu Material (MNG).
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  • Metamaterial Loaded Frequency Tunable Electrically Small Planar Patch Antenna

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Authors

Tanuj K. Garg
Department of Electronics & Communication Engineering, Gurukul Kangri University, Haridwar, India
S. C. Gupta
Department of Electronics & Communication Engineering, DIT, Dehradun, India
S. S. Pattnaik
Department of ETV, NITTTR, Sector-26, Chandigarh, India

Abstract


In this paper, we present a metamaterial loaded frequency tunable electrically small planar patch antenna. Metamaterial structure has square shaped split ring resonator (SRR) with micro-splits. Frequency tunability is achieved by using RF MEMS switches. By making RF MEMS switches ON/OFF, the reactance of SRR structure changes and thus frequency of antenna is controlled. The patch antenna resonates at 27 GHz. But when the patch antenna is loaded with SRR structure, the loaded antenna is tuned to 9.02GHz, 9.08 GHz and 9.16 GHz by making RF MEMS switches ON/OFF. The resonant frequency of loaded antenna increases because as additional micro-splits are incorporated, series capacitances are introduced in SRR which decreases the overall capacitance of SRR. In all cases the loaded antenna satisfies the condition, Chu limit ka < 1, for an antenna to be electrically small. Also there is no requirement of additional matching networks.

Keywords


Chu Limit, Electrically Small Antenna, RF MEMS Switch, Micro-splits, Single Negative Material (SNG) Split Ring Resonator (SRR), Negative Mu Material (MNG).



DOI: https://doi.org/10.17485/ijst%2F2014%2Fv7i11%2F59395