Parabolic (microwave) Antenna
To direct microwaves in narrow beams for point-to-point communication links or radiolocation (radar), a parabolic antenna is usually used. This is an antenna that uses a parabolic reflector to direct the microwaves. To achieve narrow beamwidths, the reflector must be much larger than the wavelength of the radio waves. The relatively short wavelength of microwaves allows reasonably sized dishes to exhibit the desired highly directional response for both receiving and transmitting.
Read more about this topic: Microwave Transmission