household requirement. Therefore, the development of domestic satellite antenna has become more important and popular.
In general, synchronous satellite orbits the earth synchronously with the rotation of the earth. Therefore, the satellite may be provided as a relay station for signal transmission when the transmitters on the ground transmit signals between each other via the satellite. The signal is carried by radio wave transmitted from the transmitter to the satellite, and then the satellite transmits the signal which is carried by another radio wave, which is received by a parabolic reflector antenna of a receiver device on the ground.
For example, in the United States of America, the image signal of the satellite direct broadcast program carried by a circular polarization wave is transmitted to the viewer via the DBSSpeaking at a press conference where officials confirmed they were treating the attack as “cowardly terrorist attack”, Mr Blasio said a number of other people had been injured.

“Let me be clear, this was an act of terrorism, a particularly cowardly act of terrorism aimed at innocent civilians,” he said, speaking on a evening when the city was preparing to celebrate Halloween.

New York Truck attack Show all 6 1 /6 New York Truck attack New York Truck attack Investigators inspect the truck following the attack Investigators inspect a truck following a shooting incident in New York on 31 October 2017. Several people were killed and numerous others injured in New York on Tuesday when a suspect plowed a vehicle into a bike and pedestrian path in Lower Manhattan, and