DESIGN OF CUBESAT designing antennas.pdf
- 1. DESIGN OF CUBESAT BY- T.JAHNAVI 178W1A0452 ECE 1
- 2. WHAT IS A SATELLITE ? A satellite is an object that is placed intentionally into orbit . These orbits are called Artificial satellites to distinguish from natural satellites such as Earth’s Moon. CLASSIFICATION OF SATELLITES: Large Satellite : More than 1,000kg Medium-sizes Satellite:500-1,000kg Small Satellite: Mini Satellite:100-500kg Micro Satellite:10-100kg Nano Satellite:1-10kg Pico Satellite:0.01-1kg Femto satellite:0.001-0.01kg
- 3. • Small satellite over large satellite: • Large Satellite will have high life time due to high volume. • As a result we can accommodate many solar panels as required. • Coming to Cubesat which is a small satellite will have limited area when compared • large satellite as a result it can accommodate only less number of solar panels. • As a result small satellite will have less power generation. • Indeed, small satellite has many advantages when compared to large satellite. • Lower cost of manufacturing. • Low launch cost.
- 4. • Orbits: • Low Earth Orbit->180-2,000km. • Mid Earth Orbit->2,000 -35,780 km. • High Earth Orbit and Geo Synchronous Orbit=>35,780km. • In this model ,we are focusing on LEO(Low Earth Orbit) as it is nearer to earth and therefore • It captures high quality images. • LEO is an orbit that does not stay in a fixed position relative to the surface. • LEO provides high bandwidth and low communication time lag. • Hence 99.9% of satellites are placed in LEO • “MARCO” is not placed in LEO orbit.
- 5. • STRUCTURE OF CUBESAT: • The dimensions of Cubesat are multiples of 10cm*10cm*10cm . • Its weight is less than 1.333kgs • Its power consumption is less than 10 watts. • Cubesat operates at 435-438MHZ. • Pocket cubesat is advanced version of Cubesat where in single 1u Cubessat we can havE 10 Cubesates. • If two Cubesates are placed horizontally then 2u=20*10*10. • If two Cubesates are placed vertically then 2u=10*20*10. • If three Cubesates are used then 3u=30*10*10.
- 6. • LIST OF COMPONENTS USED IN CUBESAT: • Computer • Batteries • Payload • Transceiver(Antenna) • Aluminium frame • SD Card • Mini computer • Nuts and bolts • Mechanical switches. • APPLICATIONS OF CUBESAT: • Earth and space observation • Asset tracking • Science and environment • Security • Defence and National space programmes • IOT and communication
- 7. MICROSTRIP RECTANGULAR PATCH ANTENNA: Microstrip antenna is an antenna that is fabricated using microstrip techniques on PCB.These are mostly used in microwave frequencies. Microstrip antennas has its importance mostly in fields of medical,military,mobile andSatellite communications. It has has importance due its small size and light weight.But these antennas have narrow bandwidth and low efficiency and greatly depend ondielectric constant and loss tangent.
- 8. ADVANTAGES OF PATCH ANTENNA: Low fabrication cost Easily integrated with Microwave Integrated Circuits(MIC’S) Capable of dual and triple frequency operations Less size and low mass Supports both linear and circular polarization DISADVANTAGES OF PATCH ANTENNA: Narrow bandwidth associated with tolerance problem Low gain Large ohmic losses in feed structure of arrays Excitation of surface waves Radiate into Half-space
- 9. MODELLING IN THE HFSS13.0ENVIRONMENT Modelling of the micro strip patch is done in ANSOFT HFSS 13.0 software. The model contains a PATCH, GROUND PLATE and SUBSTRATE. The antenna is designed for the band width frequency of 2.4GHz and di-electric constant of 4.4
- 10. MODELLING IN AUTODESKFUSION360 ENVIRONMENT The design of 1U cubesat using AutoDeskFusion360 software is done as follows
- 11. RESULTS In HFSS Software we design the patch which is the base of the satellite and we get the output as given below figure
- 12. In Autodeskfusion360 software we get full structure of the satellite and will get the results as given below