ncc hemant ppt
DESCRIPTION
PPT presented on NCC 2015, IIT Bombay on gain enhanced metamaterial antennaTRANSCRIPT
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Gain Enhancement of Microstrip Patch Antenna using Near-Zero Index
Metamaterial (NZIM) Lens
Hemant Suthar, Debdeep Sarkar*, Kushmanda Saurav
and Kumar Vaibhav Srivastava
Department of Electrical Engineering,
Indian Institute of Technology Kanpur, India
*[email protected] (Corresponding Author)
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Outline of the Presentation
March 1, 2015 C10: Antennas, Paper ID: 168 2
I. Near Zero Index Metamaterials (NZIM)
II. Design of compact NZIM unit cell
III. Gain Enhancement of Microstrip Patch Antenna
with NZIM Lens
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Near Zero Index Metamaterial (NZIM)
March 1, 2015 C10: Antennas, Paper ID: 168 3
NZIM is a special class of
metamaterial in which refractive
index remains zero over a desired
frequency range
NZIM is capable of converting
diverging wave into planar wave
Enoch, Stefan, et al. "A metamaterial for directive emission." Physical Review Letters 89.21 (2002): 213902.
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Unit Cell : Design and Characterization
March 1, 2015 C10: Antennas, Paper ID: 168 4
Top View Bottom View HFSS Model
ax = ay = 4.5 mm, L1 = 4.2 mm, L2 =1.725 mm, L3 =1.2 mm, W1 = 4.3 mm, W2 = 3.5 mm, W = 0.25 mm
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Evolution of the unit cell
March 1, 2015 C10: Antennas, Paper ID: 168 5
H. S. Chen et al, Left-handed materials composed of only S-shaped resonators, Physical Review
E, vol. 70, 057605, 2004.
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Design Procedure of the proposed
miniaturized NZIM unit cell: Stage-1
March 1, 2015 C10: Antennas, Paper ID: 168 6
H. S. Chen et al, Left-handed materials composed of only S-shaped resonators, Physical Review
E, vol. 70, 057605, 2004.
X. Chen et al, Robust Method to retrieve the constitutive effective parameters of metamaterials,
Physical Review E, vol. 70, 016608, 2004.
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Design Procedure of the proposed
miniaturized NZIM unit cell: Stage-2
March 1, 2015 C10: Antennas, Paper ID: 168 7
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Design Procedure of the proposed
miniaturized NIM unit cell: Stage-3
March 1, 2015 C10: Antennas, Paper ID: 168 8
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Effect of Design Parameters on Zero
Index Frequency Region
March 1, 2015 C10: Antennas, Paper ID: 168 9
Variation with L3
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Reference Microstrip Patch Antenna
March 1, 2015 C10: Antennas, Paper ID: 168 10
Top View Side View
Lp = 16.5 mm, Wp = 12.6 mm, Ls = 60
mm, Ws = 50 mm, S1 = 3 mm
Bandwidth
Peak Gain
4.25 % 5.6 dBi
Substrate: FR4-Epoxy
(r = 4.4, tan = 0.02)
Thickness = 1.6 mm
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March 1, 2015 C10: Antennas, Paper ID: 168 11
Variation with W2
Effect of Design Parameters on Zero
Index Frequency Region (Contd.)
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Beamwidth of Reference Microstrip
Patch Antenna
March 1, 2015 C10: Antennas, Paper ID: 168 12
E Plane
H Plane
3D Gain Pattern
E
H
900 720
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Patch Antenna with NZIM Lens
March 1, 2015 C10: Antennas, Paper ID: 168 13
Top View Side View
3-D View
h ~ 0.5patch
J. P. Turpin, Q. Wu, D. H. Werner, B. Martin, M. Bray and E. Lier, Near-Zero-Index Metamaterial Lens
Combined With AMC Metasurface for High-Directivity Low-Profile Antennas, IEEE Transactions on
Antennas and Propagation, Vol. 62, No. 4, pp. 1928-1935, 2014.
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Comparison of Simulated Results
March 1, 2015 C10: Antennas, Paper ID: 168 14
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Beamwidth of Proposed Antenna
March 1, 2015 C10: Antennas, Paper ID: 168 15
E Plane H Plane
Antenna E H
Reference 900 720
Proposed 580 510
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Fabricated prototypes
March 1, 2015 C10: Antennas, Paper ID: 168 16
Top View Bottom View
Top View Side View
Substrate: FR4-Epoxy
(r = 4.2, tan = 0.02)
Thickness = 1.6 mm
Substrate: FR4-Epoxy
(r = 4.4, tan = 0.02)
Thickness = 0.8 mm
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Measured Parameters
March 1, 2015 C10: Antennas, Paper ID: 168 17
Antenna Bandwidth Peak Gain
(dBi)
Reference 4.66 5.32
Proposed 5.28 7.43
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2D radiation Pattern
March 1, 2015 C10: Antennas, Paper ID: 168 18
E Plane H Plane
Reference
Antenna
Proposed
Antenna
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Measured Beamwidth
March 1, 2015 C10: Antennas, Paper ID: 168 19
E Plane H Plane
Antenna E H
Reference 860 820
Proposed 500 520
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Conclusion
March 1, 2015 C10: Antennas, Paper ID: 168 20
A compact NZIM unit cell has been proposed.
As compared to a simple mirrored S-shaped unit cell, the proposed unit-cell
exhibits 51.72% reduction in electrical size.
The near-zero index frequency band is tuned to overlap with the operating
band of a WLAN band MPA.
An array of 7 7 such NZIM unit cells is used as superstrate over the MPA.
The simulated and measurement results confirm that the introduction of
superstrate significantly increases the gain of patch antenna and reduces the
HPBW in both E-plane and H-plane.
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March 1, 2015 C10: Antennas, Paper ID: 168 21