Design and Development of S-Band Circularly Polarized Micro Strip

8/6/2019 Design and Development of S-Band Circularly Polarized Micro Strip

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SPECIFICATIONSFREQUENCY RANGE 3-3.5GHZ

OBJECTIVEGAIN >5DBRETURN LOSS < -10DB

SOFTWAREHFSS (HIGH FREQUENCY STRUCTURE SIMULATOR)

ADS (ADVANVED DESIGNING SYSTEM)


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CONDITION FOR CIRCULAR

POLARIZATIONCIRCULAR POLARIZATION CAN BE OBTAINED IF TWO

ORTHOGONAL MODES ARE EXCITED WITH A 90

DEGREE TIME PHASE DIFFERENCE BETWEEN THEM

Feed line

Patch

Splitter


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CIRCULARPOLARIZED WAVE


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PROCESSy TO CALCULATE RADIUS OF CIRCULAR PATCH

We need to design Power divider first to determine the radius of

circular patch & we are using

Er=2.2

g=c/f =92.30mm

g/ 4=23.0750mm

We are calculatingg/ 4 because one side of power divider shoulddifferby g/ 4 of the other side, in order to get 90 degree phase shift.


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3DB POWERDIVIDERINADS

Length & Width ofsubstrate is calculatedusing Line calculator of

ADS


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33.3542


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THISLENGTHISNOTHINGBUTTHE

HYPOTENUSEOFATRIANGLE, WHOSEBASE

& HEIGHTISRADIUSOFTHEPATCH

Hyp

Base

Height

Where Hyp^2=Base^2 +Height^2


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SUBSTRATELENGTH AND WIDTH OF SUBSTRATE SHOULD BE

GREATER THAN THE RECTANGLE IN WHICH THE

CIRCULAR PATCH IS ENCLOSED

Let us take

Lsub=138.45mm

Wsub=120mm

Height of substrate=0.79mm


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NOWWEDEVELOP MICROSTRIPPATCH

ANTENNAINHFSS


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SUBSTRATE

SUBSTRATE


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PATCH

Patch of radius 2.3718cm


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Then we need to call 3dB powerdivider from ADS to HFSS , so

that we can implement our

divider to patch in HFSS


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3dB POWER DIVIDER


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WAVEPORTDESIGN:

Width of wave port = 5 (width of feed line)

Height of wave port = (width of feed line) + 6 (height ofsubstrate)

Where width of feed line is calculated using Line

Calculator in ADS, width of feed line = 2.408 mm


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AFTERTHATWENEEDTOASSIGNBOUNDARY

CONDITION,WHICHISEQUALTOTHEG/4=23.0750MM

THROUGHALLTHESIDEOFSUBSTRATE


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THENWESIMULATETHEANTENNATO

CHECKTHERESULT


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SIMULATEDRESULT


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Simulated polar plot


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View at phi=0 degree


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View at phi=90 degree


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FORCIRCULARRATIOTHEAXIALRATIOSHOULD

BEINRANGEOF0TO3DB


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ADVANTAGES

Light weight and low volume.Low profile planer configuration which can be easilymade

conformal to host surface.Low fabrication cost, hence can be manufactured in largequantities.Can be easilyintegrated with microwave integrated circuits(MICs).Mechanicallyrobust when mounted on rigid surfaces.Light weight, low volume and low profile planar configurationsthat can be made conformal.


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DISADVANTAGES

Narrow bandwidthLow efficiencyLow GainExtraneous radiation from feeds and junctionsLow power handling capacity.


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APPLICATIONS

This designed patch is been utilized for the following

purpose at LRDE Bangalore.

Costal surveillance antenna

Satellite communications

Missile telemetry

Satellite navigation receiverBiomedical radiator


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CONCLUSION

Circular Polarized S-Band Microstrip Patch Antenna is

successfully designed in this project, The proposedmicrostrip patch antenna achieves a fractional

bandwidth of 0.5GHz (3.0 to 3.5GHz) at -10 dB returnloss, with -25dB return loss at centre frequency is beenachieved. The achievable gain of the antenna is 5.9dB(greater than 5db).The proposed patch has a compactdimension (radius) of 2.3718cm.

This designed patch is been utilized for costalsurveillance antenna for purpose of DEFENCE at LRDEBangalore.


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FUTUREWORKWe can increase the Bandwidth of Micro-strip Patch

Antenna in two ways-

Bymaking Slot in the Patch of Antenna

Byusing Arrays of Antenna


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Design and Development of S-Band Circularly Polarized Micro Strip

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