Syed Ubaid Ali
Transcript of Syed Ubaid Ali
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Syed UbaidAli
BS
telecomReg #9222
IQRA
University
s.ubaidali h
http://www.iqra.edu.pk/http://www.iqra.edu.pk/http://www.iqra.edu.pk/http://www.iqra.edu.pk/ -
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Patch Antenna
What is patch antenna ?
How the patch antenna works
What are the feeding Techniques for patchantenna?
What are the advantage and disadvantage ofatch antenna?
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What is Patch Antenna ?A patch antenna consists of a radiating patch(metal)on one side of a dielectric substrate and aground plane on the other side
Top view side view
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L = The length of the patch
W = The width of the patch
h = The height of the dielectric substrate
( r) = The dielectric constant of the substrate
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How a patch antennaworkWhen the patch antenna excited in itsfundamental TM10 mode
Electromagnetic energy in and/or out of thepatch. By which fringing field is produce alongthe two edges of the patch
These fringing fields cause the patch antenna toradiate
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Shape of patch antenna
the patch is generally square, rectangular,circular, triangular, elliptical or some othercommon shape as shown below
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Feed Techniques
These methods can be classified into twocategories
Contactingnon-contacting
In Contacting RF power is fed directly to theradiating patch
In non-contacting RF power is not directly fedto the radiating patch
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Feed Techniques
The four most popular feed techniques are
Microstrip feed line contactingCoaxial feed
Aperture coupling non contacting
Proximity coupling
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Advantages anddisadvantagesAdvantages
Light weight
low volume
Low fabrication cost
Good effiency
Disadvantages
Narrow bandwidth
Non omnidirectional atterns
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Degisn a patch antenna
FR 4 substrate Er = 4.4
Height of substrate h = 1.58 mm
Resonate frequency fr = 2.45 Ghz
Length of the patch = ?
Width of the patch = ?
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Finding Length & Width ofPatch
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Open Asoft
designer ver 2
Click on project and
select
insert EM planer design
Select none
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Click Layout
Then selectlayers >stackup
Click Addlayer
Name>groung
Type>metalizedsignal
Click >ok
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Click Addlayer
Name >signal
Type>signal
Click >ok
Changematerial to FR4 substrate
With thickness
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N li k li k di l
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Now clickproject>insert circuitdesign
Then select >none
Click>schematic>layer>
stackup
And repeat the step asdone in EM planerdesign
Now select
circuit>add model
data>add substrate
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Select
Circuit >TRL>microstrip>single>
Then select FR 4 then click OK
Zo=82.46
E=90
Frequency=2.45
Click on synthesis
Note down the value of P and W this will be thelength of the transmission line
P=17.2786
W=1.13847
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now add interface port and ground by click on draw
Now add a resister throw componenttab>lumped>resister
on your left side
Make the connection from port to ground throw thetransmission line and 136 omh resister
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Right click on Analysis>click on add solutionsetup
Click next
Select F then click Edit
Select linear count
2 to 3 Ghz 10 count
Then click Add
Then ok and then click finish
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Click on Analysis
Right click on
NWA1>then select analysis NWA1
Then select
result>create report >click ok then Add trace
Then click ok
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Now go EM planer design
Then DRAW a rectangle double click on rectangle
Uncheck the 2 pt discriptionThen click ok
Again double click on rectangle
Place the value of width and height
Which we have find earlier
W=37.26mm
H=28.60mm
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Then DRAW a rectangle double click onrectangle
Uncheck the 2 pt discription
Then click ok
Again double click on rectanglePlace the value of width and height
Which we have we find by synthesis
W=1.13847
P=17.2786
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Click edit>select edges
then click on one side of transmission line
Then add a port throw
Excitation>add port
Click on analysis >add solution
Frequency =2.45Ghz
Click ok
Click analysis >setup 1>add sweep frequency
Check on generate current
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Right click on analysis>setup 1>sweep1>analyze
After some time when analyze is done
Right click on
Sweep 1 >results>plot templets>S-parameter
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The End