There are two most favorable orbits of satellite for providing the communication links:
4.1 Polar Orbits:
The polar orbiting satellites orbit the earth in such a way as to cover the north and south Polar Regions. The altitude of polar orbiting satellite is constant over the polar region and it is approximately 1000 Km. The period of orbiting is about 1.5 Hrs and at 90°inclination to ensure that satellite passes every region of earth. Example :IRIDIUM, GLOBAL STAR etc.