What is the difference between ka band and ku band in satellite communication?

The frequencies of 1 and ka are higher, and the antenna beam with the same aperture is narrower and more directional, which means that the antenna receives less interference from neighboring satellites and has less restrictions on off-axis power spectral density, thus improving the performance of the system. More vacant orbital positions can give non-mainstream satellite operators the opportunity to enter this market and try more innovations;

2. Different from Ku band, the United States allocated a special Ka frequency for government applications, which enabled the government to establish its own satellite constellation system. The famous broadband global communication satellite communication system (WGS) is the product of this policy.

3. The limitation of 3.Ka band is different from that of Ku band. Although Ka-band can obtain better directivity and gain under the condition of fixed antenna size, it is offset by higher space loss. In addition, for commercial Ka-band, the off-axis EIRP spectral density (ESD) is more strictly limited, which is very important for mobile application systems.

Ka-band extended data satellite system is not a simple clone of Ku system. Ku-band satellites usually use regional beams covering the whole continent or a specific ocean (such as Intelsat, EUTELSAT, TELSAT, etc.). ) and is specially designed for transmitting TV programs.

Although some Ka-beam are designed in this way, most of the new Ka-band satellites use spot beams to cover a certain area, or use the frequency reuse technology (Viasat- 1, Inmarsat-5 Global Xpress) to use movable spot beams through multipoint beams. The difference of system architecture leads to the difference of satellite performance and available spectrum resources.

Baidu encyclopedia -KA band

Baidu encyclopedia -KU band