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ANTENNA DEPLOYMENT IN NANOSATELLITES AND PICOSATELLITES
By
GIREESH
SATELLITES
Natural or artificial object revolving around the earth.
ClassificationBigger satellitesSmaller satellites
• Minisatellites• Microsatellites• Nanosatellites• Picosatellites
ANTENNA
Essential part for communicationSender antenna and receiver
antennaDownlink and uplinkFrequency C band and Ku band
ANTENNA DEPLOYMENT
Antennas for bigger satellites
Antennas for smaller satellites Nanosatellites and
Picosatellites
DEPLOYMENT MECHANISMS
Nylon wire melting technique
Tape measure housing
Electromagnetic plunger holding technique
NYLON WIRE MELTING TECHNIQUE
Principle of operation Nichrome wireAntenna holding technique
•Rolled antenna•Rolled antenna with housing •Flexible band deployment mechanism•Antenna bent around the guide
ROLLED ANTENNA
ROLLED ANTENNA WITH HOUSING
FLEXIBLE BAND DEPLOYMENT MECHANISM
ANTENNA BENT AROUND THE GUIDE
ELECTRICAL INTERFACE
Objective
• Low Power • Time• Feedback• Microcontroller• Nylon wire• Power Mosfet• Feedback element• Battery• Regulator
• Components used
CIRCUIT DIAGRAM
WORKING OF CIRCUITPower onPWM input to mosfet from
microcontrollerNichrome wire heatingNylon wire meltingAntenna deploymentFeedback to microcontroller
NICHROME WIREGauges of Nichrome wireHeating response
TAPE MEASURE HOUSING TECHNIQUEMeasure housingRollers to reduce the friction
ELECTROMAGNETIC PLUNGER HOLDING METHOD
REQUIRED SPECIFICATION
Temperature rangeVibrationPower consumptionReliableLong life
PRE LAUNCHING TESTS FOR SATELLITES
ElectricalMechanicalThermal testVibration testThermal vacuum test
DRAWBACKSHigh costTime delay in responding
FUTURE
“ FEMTO-SATELLITE”
THANK YOU