design of a dual band antenna
TRANSCRIPT
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Design of a Dual Band Antenna
Guided By: By:
Dr.Abhishek Tomar Akanksha
38737 Archana Rawat38748 Noorie Khan
38773
Vineeta Rani 38810
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OBJECTIVE
This project focuses on the software simulation
of microstrip dual band antenna.
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Review of Antenna
An electrical conductor or system of
conductors
Some important parameters are:-
(a). Gain - measure of the concentration of
radiative power in a particular direction
(b).Efficiency- a measure of the relative power
radiated by the antenna.(c).Effective area - measure of the ability of
the antenna to extract energy from a passing
EM wave.
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(d).Directivity- measure of the concentration of
radiation in the direction of the maximum.
(e).Input Impedence-the impedance presented
by an antenna at its terminals
(f).Radiation Loss - the amount of power that is
lost to the load and does not return as a
reflection(g).Radiation Pattern- plot of the far-field
radiation properties of an antenna as a
function of the spatial co-ordinates
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(h).Beamwidth-the angular separation of the
half-power points of the radiated pattern
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MICROSTRIP ANTENNA
Planar resonant cavities that leak from their
edges and radiate
Consists of a radiating patch on one side of a
dielectric substrate which has a ground planeon the other side
Patch is of conducting material and of any
possible shape.
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patch radiates from fringing fields around its
edges
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Advantages of Patch Antennas
Light weight and low volume.
Low fabrication cost, hence can be
manufactured in large quantities.
Supports both, linear as well as circular
polarization.
Can be easily integrated with microwave
integrated circuits (MICs).
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Disadvantages of Patch
Antennas
Narrow bandwidth
Low efficiency
Low Gain
Extraneous radiation from feeds and junctions
Poor end fire radiator except tapered slot
antennas
Low power handling capacity.
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Coaxial Feed
common technique used for feeding Microstrip
patch antennas
the inner conductor of the coaxial connector
extends through the dielectric and is solderedto the radiating patch, while the outer
conductor is connected to the ground plane
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main advantage-the feed can be placed at anydesired location inside the patch
major disadvantage-provides narrow
bandwidth and is difficult to model
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Transmission Line Model
Represents the microstrip antenna by two slots
of width W and height h, separated by a
transmission line of length L.
The microstrip is a non homogeneous line oftwo dielectrics
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EQUATIONS USED
reff= (reff+ 1)/2 + (reff- 1)/2[1+12h/W]-1/2
L=0.412h(reff+ 0.3)(W/h + 0.264)/((reff-0.258)(W/h + 0.8))
Leff=L+2 L
Leff=c/(2fo(reff)
W=c/(2fo((r+1)/2))
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Simulation Software IE3D
full-wave electromagnetic simulator
analyzes 3D and multilayer structures of
general shapes
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Proposed Antenna Design
The software part of design is determination of
the radiation pattern and return loss curve
three essential parameters for the design-
1) Frequency of operation (fo)
2) Dielectric constant of the substrate (r)
3) Height of dielectric substrate (h)
a dual band antenna that uses tworectangular patches connected to each other
using 4-briges.
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Parameters used
Permittivity of substrate = 3.18
Height of substrate = 3.400 mm
Frequency =2.4 GHz (due to outer patch)=5.5
GHz (due to inner patch)
Bridge width = 2 mm
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The dimensions of the patch are as follows
Ground plane Lg = Wg = 40 mm (Square
ground plane)
Outer Patch L = W = w2 = 28 mm (Square
outer patch)
Inner Patch L = 18mm
W = 15.13 mm .
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Meshed dual band patch
antenna
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Directivity vs Frequency
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Gain vs Frequency
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VSWR
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RETURN LOSS CURVE
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True 3D Radiation Pattern
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Conclusion
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References
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THANK YOU