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Directivity and Bandwidth Enhancement of Patch Antenna using Metamaterial

Author(s) : Ranjeet Pratap Singh Bhadoriya

Publisher : FOREX Publication

Published : 30 June 2021

e-ISSN : 2347-470X

Page(s) : 6-9

Nowadays, the term metamaterials can be found frequently in the literature. The prefix “meta” in Greek means “beyond”. According to a general definition, metamaterials are usually used to refer the artificial material which has some electromagnetic properties which are not common in the nature [6]. In nature the permittivity and the permeability of most materials are positive. The material with positive permittivity and permeability are referred as right-handed material (RHM). The medium with simultaneously negative values of permittivity ε and permeability μ was initially proposed by Veselago [2]. G. V. Eleftheriades [12] presented clear experimental evidence confirming negative refraction and went even further to demonstrate for the first time focusing of electromagnetic waves from a left-handed lens. The structure used was a 2D periodically L-C loaded TL network (dual TL medium). Claudio G. Parazzoli [13] at Boeing Phantom Works at Seattle carried out an experiment similar to that made by Smith in [5]. Using a free-space measurement setup, they detected negatively refracted waves at a remarkably long distance from the LHM sample, thereby dispelling any doubt concerning the far field nature of these waves. These results, which fully supported the theoretical results of [16, 17], clearly confirmed the existence of negative refraction. G. V. Eleftheriades [15] presented simulation results showing sub wavelength focusing capability of a LHM lens. They used a 2D dual TL medium sandwiched between two 2D conventional TL media (right-handed media). Evidence of growing evanescent waves within the dual TL medium was shown for both infinite and finite length structures. In December 2003, they published further analytical and simulation results on sub wavelength focusing. In particular, they discussed the required criteria for perfect focusing, as well as the restrictions imposed on the resolution by the periodicity of the LHM used.

CST-MSW was used for designing and simulation of the proposed microstrip antenna alone and with metamaterial cover. Dimension of patch antenna was calculated for the operating frequency of 2.75 GHz. Substrate used was FR4 lossy which has dielectric constant of 4.3 and height 1.6 mm.

After calculation of dimensions using formulas stated in [1], Length and width of the proposed RMPA were calculated by using formulas in [1], and the designed RMPA is shown in figure 1. The simulated results of the proposed RMPA are shown in subsequent figures from 2 to 4.


Figure 1:RMPA at 2.75 GHz



Figure 2: Simulated result of RMPA shown in Fig. 1



Figure 3: Simulation result shows directivity, efficiency and radiation pattern.



Figure 4: Smith Chart of the proposed patch without metamaterial introduction.


After simulation it appeared that the proposed antenna parameters are not fulfilling the requirement so a metamaterial structure is incorporated over this proposed patch. This metamaterial implementation modifies the antenna parameters to a great extent. e. g. return loss [6], bandwidth after implementation of metamaterial also increased than the bandwidth of RMPA alone. All the results after implementation of metamaterial are shown in fig. 6 to 8. And metamaterial structure shown in fig. 5.


Fig. 5. Proposed LH material design at the height of 3.276mm from base



Fig. 6. This is the simulated result of design in figure 4, dip at 2.37GHz. The value of return loss and bandwidth was introduced before.


After introduction of metamaterial the parameters of patch modifies drastically, return loss has been increased from -10.5dB to -29dB and bandwidth also increased from 44GHz to 77GHz. Radiation pattern result are listed follows.


Fig. 7. This is the simulated result of design in figure 4, showing radiation pattern with efficiency and directivity



Fig. 8. Smith Chart of the proposed patch after metamaterial introduction.



Fig. 9. Polar plot of the proposed patch after metamaterial introduction.


After simulation of RMPA alone and after metamatarial it has been observed that the antenna performance parameters have been increased drastically after introducing metamaterial cover. These results are compared w.r.t the parameter variation. Comparative chart is shown below in table 1.

TABLE I: COMPARISON CHART

S. no.

Parameters

Parameters of RMPA alone at 2.75 GHz

After metamaterial introduction at 2.45 GHz

1

Return loss

-10.5 dB

-29dB

2

Bandwidth

44 MHz

77 MHz

3

Directivity

6.047dB

6.217dB

4

Efficiency

76%

77%


After the comparison it has been observed that the proposed metamterial structure converted the single band antenna to double band without affecting its parameters and bandwidth has also increased as desired.

The designed antenna could be used in wireless communication for S band. Antenna will be able to propagate at frequency of 2.45 by applying a resonant frequency of 2.75 GHz. Return losses of the propagating frequencies increased from -10.5 dB to -29 dB as well as Bandwidth of the antenna have drastically improved from 44 MHz to 77 MHz after introduction of metamaterial cover. This proposed design by authors can reduce the size of antenna required because frequency has been shifted from 2.75 to 2.45 Ghz, this theory was proposed in [8]. This proposed design could be useful when more directive antenna is required.

Ranjeet Pratap Singh Bhadoriya , Assistant Professor Electronics & Communication Department, IPS College of Technology & Management, Gwalior, India ; Email: r.pratap7872@gmail.com

[1] C. A. Balanis, “Microstrip Antenna” in Antenna Theory and Design, Vol 3, John Wiley & Sons, Inc., 1997, pp. 811-882.

[2] D. M. Pozar, “Introduction to microwave system” in Microwave Engineering, 4th Edition. John Wiley & Sons 2004, pp. 658-99.renko,,” Comparison Of 3-D And 2-D DCT Based Filtering Of Multichannel Images”, Synposium Proceedings,2007.

[3] V. G. Veselago, “The electrodynamics of substances with simultaneously negative value ε and μ”, Sov. Phys. Uspekekh, Vol no. 10 (4), pp. 509-514, 1968.

[4] J. B. Pendry, “Negative refraction males a prefect lens”, Phys Rev Lett, 85, pp. 3966–3969, 2000.

[5] R. A. Shelby, D. R. Smith, S. Shultz, “Experimental Verification of a Negative Index of Refraction,” Science Vol. 292, pp. 77-79, 2001.

[6] N. Garcia and M. Nieto-Vesperinas, “Nieto-Vesperinas and Garcia Reply,” Physical Review Letters, vol. 91, no. 9, p. 099702, 2003

[7] P. K. Singhal et al., “Design and Characterization of Compact Microstrip Patch Antenna Using “Split Ring” Shaped Metamaterial Structure” IJECE, Vol.2, No.5, pp. 655~662, 2012

[8] R Bhadoriya et al, “Miniaturisation of WLAN feeler using media with a negative refractive index”. BIJIT, Vol.5, No.1, 2013.

[9] Ahmad A. Sulaiman et al., “Bandwidth Enhancement in patch antenna by metamaterial substrate”, European Journal of scientific research, Vol. 44 No. 3, pp. 493-501, 2010.

[10] Huda A. Mazid, Mohammad Kamal A. Rahim, Thelasa Masri, “Left-handed metamaterial design for microstrip antenna application”, IEEE International, RF and Microwave conference, pp. 218-221, 2008.

[11] 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.

[12] G. V. Eleftheriades, A. K. Iyer, and P. C. Kremer, “Planar Negative Refractive Index Media Using Periodically L-C Loaded Transmission Lines,” in IEEE Transactions on Microwave Theory and Techniques, vol. 50, no. 12, pp. 2702–2712, 2002.

[13] C. G. Parazzoli, R. B. Greegor, K. Li, B. E. C. Koltenbah, and M. Tanielian, “Experimental Verification and Simulation of Negative Index of Refraction using Snell’s Law,” Physical Review Letters, vol. 90, no. 10, p. 107401, 2003

[14] R. P. Singh Bhadoriya and S. Nigam, "Bandwidth enhancement and modification of single band patch antenna into double band," 2016 3rd International Conference on Computing for Sustainable Global Development (INDIACom), 2016, pp. 1029-1032.

[15] A. Grbic and G. V. Eleftheriades, “Growing Evanescent Waves in Negative-Refractive-Index Transmission-Line Media,” Applied Physics Letters, vol. 82, no. 12, pp. 1815–1817, 2003.

[16] D. R. Smith, D. Schurig, and J. B. Pendry, “Negative Refraction of Modulated Electromagnetic Waves,” Applied Physics Letters, vol. 81, no. 15, pp. 2713–2715, 2002.

[17] J. Pacheco, T. M. Grzegorczyk, B.-I. Wu, Y. Zhang, and J. A. Kong, “Power Propagation in Homogeneous Isotropic Frequency-Dispersive Left-Handed Media,” Physical Review Letters, vol. 89, no. 25, p. 257401, 2002.

Ranjeet Pratap Singh (2021), Directivity and Bandwidth Enhancement of Patch Antenna using Metamaterial. IJEER 9(2), 6-9. DOI: 10.37391/IJEER.090201.https://ijeer.forexjournal.co.in/archive/volume-9/ijeer-090201.html