Launched by NASA, Echo 1 was a aluminised passive reflector for radio communications.
2.
Located behind each dipole was a passive reflector wire, spaced 0.18 wavelength back.
3.
Only the middle tower of each three was driven; the other towers acted as passive reflector and director elements.
4.
In 1960 NASA launched an Echo satellite; the aluminized PET film balloon served as a passive reflector for radio communications.
5.
Its objective was to develop a secure and reliable method of wireless communication by using the Moon as a passive reflector and natural communications satellite.
6.
Each of the two American spacecraft, launched in 1960 and 1964, was a metalized balloon satellite acting as a passive reflector of microwave signals.
7.
This led Magnus to look at a passive reflector that could be carried by a skier all times and would be a simple and practical solution.
8.
Most other forces used much longer-wavelength radars that would require paraboloid antennas of truly enormous size, and instead used a " bedspring " arrangement of many small dipole antennas arranged in front of a passive reflector.
मोबाइल