Using microwaves for communication

Using microwaves for communication

1. Geostationary orbit/ geosyynchronous orbits

   • to use microwaves for comunications, we need to use a geostationary satelite.
   • a geostationary satelite takes 24hours to complete one orbit
   • it orbits round the equator
   • the satellite stays at the same point above earth at al times

2. the microwaves need a clear path between the sattelite and the reciver in order to send signals

3. infared waves are used in optical fibres

   • the infared waves are reflected from the inside of the optical fibre. this is called- total internal reflection
   • because optical fibres travel along the surface of the earth, it means they have a shorter distance to travel. this means that the signal travels quicker through optical fibres

4. comparing the time delay in optical fibres and microwaves

   • speed= Distance travelled (km) / time taken (s)
   • time for travel = distance/ speed of light
   • time delay= distance travelled / speed of signal in glass

5. microwaves work by heating up the water content in things. this means that using a mobile phone could cause the water molecules in your brain to heat up. scientist believe that this can lead to brian tumors/cancer.