Download Communication satellite antennas : system architecture, by Robert Dybdal PDF

By Robert Dybdal

A functional method of Antenna know-how For conversation Satellites

This authoritative source discusses antenna expertise for conversation satellites, addressing either the gap and person segments. The booklet presents a procedure view of antenna functions, an outline of varied antenna applied sciences, and tips on methodologies for antenna review.

Communication satellite tv for pc Antennas starts off with an outline of the parameters that symbolize antennas, and is going directly to disguise the antenna designs, applied sciences, and process architectures required for communique satellite tv for pc platforms. suggestions to mitigate interference are lined, and the tactics utilized in the improvement and characterization of antenna structures are reviewed. become aware of how to:

  • Adhere to the method parameters used to quantify antenna performance
  • Understand the applied sciences utilized in broad assurance, earth insurance, slender assurance, and array antennas
  • Work inside of commonplace conversation satellite tv for pc process architectures and orbital alternatives
  • Address propagation obstacles and hyperlink performance
  • Implement trustworthy antenna interference mitigation techniques
  • Develop area section antennas, together with spot beam, a number of beam, adaptive uplink, energetic aperture, and point-to-point antennas
  • Apply consumer phase applied sciences, resembling reflector antenna expertise, antenna sidelobe regulate suggestions, and adaptive interference cancellation systems
  • Evaluate satellite tv for pc antennas and structures utilizing rigorous methodologies

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Extra info for Communication satellite antennas : system architecture, technology, and evaluation

Sample text

For example, the wide coverage achieved by space segment antennas in a free space environment unavoidably illuminates the spacecraft structure. The radiated scattering from the spacecraft structure degrades the wide coverage characteristics of the antenna. The challenge is to isolate the antenna from the spacecraft structure. The free space pattern of the antenna itself differs from the antenna’s pattern when the antenna is located on the spacecraft. The scattering from the spacecraft structure results in pattern ripples and cross-polarization components that distort and degrade the pattern of the antenna in a free space environment.

Consequently, the pattern when elements fail has a more random distribution has a less pronounced effect on the array pattern without element failures. If the location of the failed array elements can be determined, a possibility [31] exists to rephrase the array to attempt to maintain the required sidelobe performance. The design sidelobe performance can be maintained if a small number of elements fail, but as the number of failed elements increases, the design sidelobe cannot be recovered. If this technique is used, a means of identifying failed elements on-orbit is required, a capability that can use additional development attention.

User segment antennas look out towards space but incur atmospheric loss as discussed in Chapter 4, and as illustrated in Fig. 1-14, their antenna noise temperature varies with elevation angle and frequency of operation. Crosslink antennas that provide connectivity between satellites view a 3 K cosmic background temperature. Receiving system performance, however, depends on the system noise temperature. Today’s LNA technology offers very low noise performance. However, the system noise performance can be dominated by the antenna noise temperature.

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