Signals emitted by satellite transponders

Satellite transponders transmit signals either in C-band or KU-band, and these signals pass through space into terrestrial satellite TV reception systems.

The role of satellite ground receiving antenna

The role of the satellite ground receiving antenna is to receive the weak satellite signal propagated from space to the ground, and reduced to high-frequency current, and then sent to the receiver for further amplification and processing, and finally in the television set to obtain the image and the accompanying sound, therefore, the quality of the receiving antenna is good or bad, directly affect the quality of ground reception.

In the satellite TV reception, in addition to receiving L-band signals available spiral antenna, like C-band and KU-band commonly used parabolic antenna. Parabolic antenna is by the primary radiator (also known as the feed source) and parabolic reflector two parts, usually the phase center of the feed source placed in the focus of the parabolic surface.

The parabolic antenna is divided into plate and mesh according to the structure, and the material used is usually aluminum alloy. The plate antenna can be molded into the whole structure, and also can be assembled by multiple flaps. Plate satellite antenna gain is higher, more applications; in the windy places (such as China’s southern coastal areas, tropical storms in the rainy season), also optional aluminum alloy mesh antenna, although the mesh antenna gain is slightly lower than the plate antenna, but its strong wind resistance, corrosion resistance, light weight, also occupies a large market share.

According to the installation position of the feed source, parabolic antenna can be divided into front-fed and back-fed antenna.