Broadband Patch Antenna Design New
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Transcript of Broadband Patch Antenna Design New
8/8/2019 Broadband Patch Antenna Design New
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Under the guidance of
Prof: Golak Santra Erla. Rajesh
p08ec905
8/8/2019 Broadband Patch Antenna Design New
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Over viewy I tr cti
y Micr stri atc a te a
y Desi r ce re f sim le ecta lar Micr stri
A te a
y Br a ba i tec iq es
y F t re w r
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Introduction to road and patch antenna
y Growth of personal co unication ser vice devices
(PCS) fro o ile phone to WL N.
y Wide variety of applications like we and ulti edia
essaging.
y Increasing popularity of WL N leads to develop ent
of road and antenna
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Structure of rectangular icro strip patch antenna
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Antenna perfor ance para eters
y Radiation pattern
y irectivity
y Input i pedance
y Voltage Standing Wave Ratio (VSWR)
y Return loss
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Co on Shapes of icrostrip Ele ents
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Advantages:
y
Light weight and lowv
olu e.y Low profile planar configuration which can e easily
ade confor al to host surface.
y Low fa rication cost, hence can e anufactured in
large uantities.
y Supports oth, linear as well as circular polarization.
y Can e easily integrated with icrowave integrated
circuits ( ICs).y Capa le of dual and triple fre uency operations.
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Disadvantages:
Narrow andwidth.
Low efficiency.
Low Gain.
Extraneous radiation fro feeds and junctions.
Poor end fire radiator except tapered slot antennas.
Low power handling capacity.
Surface wave excitation
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8/8/2019 Broadband Patch Antenna Design New
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Comparisons between different feed techniques
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Polarization Types
y Linear Polarization
y Circular Polarization
Right hand circular polarization
Left hand circular polarization
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Design Procedure of si ple Rectangular
icrostrip Antenna
y Su strate Selection
y Copper Tape or Sheet
y Ele ent Width and Length
y Radiation Pattern
y eed Point Location
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Designing Equations
121 1
1 122 2
r r reff
h
w
I I I
« »
! ¬ ¼- ½
R in= R r cos2 (Txf /L) , R r>=R in
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Broad anding Techni ues
So e of the road and sche es under seriousconsideration
are
yPlanar ulti-resonators
y Stacked Electro agnetically
y Co pact road and icrostrip antennas
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Rectangular Broad and Antenna Using Parasitic
Rectangular Patchy In this ethod, instead of using parasitic rings,
parasitic patches of si ilar di ensions are placed
around the ase fed-patch.
y Initially when designing the antenna, all four parasitic
ele ents had identical di ension as the ase patch.
y The lengths of the parasitic ele ents were altered
until the re uired resonant fre uencies were achiev
ed.
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Cockroach antenna