syed ubaid ali

8/8/2019 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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Click to edit Master text stylesSecond level Third level Fourth level Fifth level


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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

Click to edit Master text stylesSecond level

Third level Fourth level

Fifth level


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Click Layout

Then selectlayers >stackup

Click Addlayer

Name>groung

Type>metalizedsignal

Click >ok

c o e as er ex s y esSecond level


Fifth level


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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

Cli k di M l


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Fifth level

Cli k di M l


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Fifth level


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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

Cli k t dit M t t t t l


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Fifth level


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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 to edit Master text stylesSecond level Third level Fourth level

Fifth level


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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

Click to edit Master text styles


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Fifth level


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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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Fifth level


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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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Fifth level



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Fifth level


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The End

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