| Reception characteristics of Ku band |
| Date: 2006-6-3 12:39:34 Author: Source: |
| Ku band refers to radio waves with a frequency of 12-48 GHz. The International Telecommunication Union prioritizes the frequency range of 11.7-12.2 GHz for satellite TV broadcasting. In terms of frequency, the Ku-band frequency is three times the C-band frequency, and the wavelength is 1/3 of the C-band 4GHz wavelength. Compared with the C band, the advantages of the Ku band are: 1. The diameter of the receiving antenna is small, because the wavelength of the Ku band is short. Under the condition of the same surface efficiency and gain, the antenna diameter of the Ku band can be 1/3 of the aperture of the C band antenna Is low. 2, the ground Ku-band high field intensity, since the Ku-band transponders in the C-band power ratio is much forward power, equivalent isotropic radiated power is large. 3. The available frequency band is wider, the frequency range of the C-band is 3.7-4.2MHz, and the bandwidth is 500MHz. The bandwidth of the Ku band is 800MHz, and the availability is high. 4. Due to the high frequency, various radio waves interfere with it less. Of course, Ku-band satellite broadcasting also has its shortcomings, which is that rain attenuation has a greater impact on it. When the radio wave passes through the rainfall area of ​​the earth's atmosphere, rain water will absorb and scatter the radio wave, causing attenuation. The greater the rain, the greater the attenuation. When the rain attenuation reaches 20db, the satellite broadcast will be temporarily interrupted, which is not much. |
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