A Metamaterial based Microstrip Patch Antenna with Improved Directionality
Author(s):
Nitin Kumar , Dehradun Institute of Technology (DIT University); Anumeha Badoni, Dehradun Institute of Technology (DIT University); Pravesh Belwal, Dehradun Institute of Technology (DIT University); Ranjita Singh, Dehradun Institute of Technology (DIT University); Sandeep Sharma, Dehradun Institute of Technology (DIT University)
Keywords:
HFSS, Patch Antenna, Metamaterial, Reduced Beam-Width
I. INTRODUCTIONHFSS, Patch Antenna, Metamaterial, Reduced Beam-Width
Abstact:
This paper focuses on improving the directive properties of a conventional patch antenna by using a known technique of applying metamaterial slab as a cover. The metamaterial under consideration is a modification of Pendry's SRR structure and is equivalent to two SRRs connected back to back. The unit cells were arranged in an array configuration, investigation of S- parameters was done for checking the Negative index property. As expected with the use of metamaterial as a cover, directionality of conventional patch antenna improved significantly and the 3 dB beam-width reduced. A conventional patch antenna generally shows 3 dB beam-width of ~80deg while the antenna presented in this paper with the metamaterial shows improved 3dB beam-width of 45 deg.
This paper focuses on improving the directive properties of a conventional patch antenna by using a known technique of applying metamaterial slab as a cover. The metamaterial under consideration is a modification of Pendry's SRR structure and is equivalent to two SRRs connected back to back. The unit cells were arranged in an array configuration, investigation of S- parameters was done for checking the Negative index property. As expected with the use of metamaterial as a cover, directionality of conventional patch antenna improved significantly and the 3 dB beam-width reduced. A conventional patch antenna generally shows 3 dB beam-width of ~80deg while the antenna presented in this paper with the metamaterial shows improved 3dB beam-width of 45 deg.
Recently, there has been a growing interest in the field of metamaterials both theoretically and experimentally. Metamaterials are artificial materials engineered to have properties that may not be exhibited by its own constituting materials. In 1968 V.G. Veselago first proposed the idea of metamaterials with simultaneously negative values of dielectric permittivity and magnetic permeability [1]. However positive permittivity and permeability are the basic properties of conventional materials available in nature known as Double positive (DPS) materials. Metamaterials are termed as Double negative (DNG) materials due to the property of negative permittivity and permeability [2-4].
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