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The main objective of this dissertation is to focus a new approach to enhance the bandwidth and improve the performance of microstrip patch antenna. This can be done by designing antenna in a way so that bandwidth enhancement ,return loss reduction, directivity improvement can be get altogether.
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SUBMITTED BY: Neetesh Sharma 0904 EC13MT
UNDER THE GUIDENCE OF: Ashish Duvey Assistante Professor Department of ECE Department SRCEM, GWALIOR (M.P.)
2 (^) The main objective of this dissertation is to focus a new approach to enhance the bandwidth and improve the performance of microstrip patch antenna. This can be done by designing antenna in a way so that bandwidth enhancement ,return loss reduction, directivity improvement can be get altogether.. (^) The Simulation work is done using Computer Simulation Technology Software (CST-10). MathCAD-14 & Microsoft Excel Software is used for verifying the Double-Negative Metamaterial Properties by Using Nicolson-Ross-Weir Method (NRW).
r r 1/ eff ] W h [1 12 2 (ε 1) 2 (ε 1) ε 1
0
fr r
(^) CALCULATION OF WIDTH (^) THE EFFECTIVE DIELECTRIC CONSTANT OF THE DIELECTRIC MATERIAL
(^) CALCULATION OF THE EXTENSION OF THE LENGTH (^) THE ACTUAL LENGTH OF THE PATCH
Classification of materials on the basis of Permittivity (ε) and permeability (μ)ε) and permeability (μ)) and permeability (ε) and permeability (μ)μ)
10 All materials are made of atoms, which are dipoles. These dipoles modify the light velocity by a factor n (the refractive index). The ring and wire units play the role of atomic dipoles: the wire acts as a ferroelectric atom, while the ring acts as an inductor L and the open section as a capacitor C. The ring as a whole therefore acts as an LC circuit. When the electromagnetic field passes through the ring, an induced current is created and the generated field is perpendicular to the magnetic field of the light. The magnetic resonance results in a negative permeability; the index is negative as well.
11 Equations used for calculating permittivity & permeability using NRW approach:
REFERENCES 13 [1] V.G. Veselago “The electrodynamics of substances with simultaneously negative value ε and μ” ” Sov. Phys. Uspekekhy.10 (4), 509-514(1968) [2] J.B. Pendry, A.J. Holden, D.J. Robbins, W.J. Stewart, “magnetism from conductors and enhanced nonlinear phenomena” IEEE Trans. Micro Tech. vol.47 no.11, pp.2075-2081, Nov. [3] D.R. Smith, W. Padilla, D.C. Vier, S.C. Nomad-Nasser, and S. Schultz, “A composite medium with simultaneously negative permeability and permittivity,” Phys.Rev.Lett.84,4184(2000) [4] Wu, B-I, W.Wang J. Pacheco, X. Chen, T. Grzegorczyk, and J.A. Kong, “A study of using metamaterials as antenna substrate to enhance gain,” Progress In Electromagnetics Research, PIER 51, 295-328, 2005.
[5] D.R. Smith, D.C. Vier Th. Koschny and C.M. Sookolis, “Electromagnetic parameterretrieval from inhomogeneous Metamaterial”, Physics review, PP.036617-1-10, [6] Wu, B-I, W. Wang, J. Pacheco, X. Chen, T. Grzegorczyk, and J.A. Kong, “A study of using metamaterials as antenna substrate to enhance gain,” Progress in Electromagnetic Research, PIER 51, 295-328, 2005. [7] R.W. Ziolkowski, “Design fabricating and fabrication and testing of double negative metamaterials,” IEEE Transactions on antennas and Propagation, vol.51, no.7, pp.1516-1529, July 05. [8] H.A. Majid, M.K.A. Rahim and T. Marsi, “Microstrip Antenna gain enhancement using left-handed metamaterial structure, progress in Electromagnetic Research M. Vol.8, 235-247,2009. [9] https://electronics-club.com/
