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

By Robert Dybdal

A useful method of Antenna know-how For verbal exchange Satellites

This authoritative source discusses antenna know-how for conversation satellites, addressing either the distance and consumer segments. The booklet offers a approach view of antenna functions, an outline of varied antenna applied sciences, and information on methodologies for antenna assessment.

Communication satellite tv for pc Antennas starts off with an outline of the parameters that represent antennas, and is going directly to conceal the antenna designs, applied sciences, and procedure architectures required for verbal exchange satellite tv for pc structures. strategies to mitigate interference are coated, and the tactics utilized in the improvement and characterization of antenna platforms are reviewed. become aware of how to:

  • Adhere to the process parameters used to quantify antenna performance
  • Understand the applied sciences utilized in large insurance, earth assurance, slim insurance, and array antennas
  • Work inside general conversation satellite tv for pc method architectures and orbital alternatives
  • Address propagation barriers and hyperlink performance
  • Implement trustworthy antenna interference mitigation techniques
  • Develop house section antennas, together with spot beam, a number of beam, adaptive uplink, lively aperture, and point-to-point antennas
  • Apply person section applied sciences, similar to reflector antenna expertise, antenna sidelobe keep watch over options, and adaptive interference cancellation systems
  • Evaluate satellite tv for pc antennas and platforms utilizing rigorous methodologies

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

Sample text

The antenna also uses a septum polarizer to produce the required circular polarized patterns. As discussed in Chapter 1, attention to RF loss is necessary to maintain high G/T performance. 1 dB using zenith radio source techniques. This measured loss value was confirmed by using the HFSS model to determine the antenna’s gain difference for a perfectly conducting horn and a horn employing the conductivity of the aluminum used to fabricate the horn. 4 Narrow Coverage Antennas Antennas for narrow coverage requirements for space segment designs and high gain requirements for user segment antennas predominately use reflector antenna technology.

Because the radiation arises from both the antenna and the spacecraft structure, excessive far field distances are involved. Such measurements would also need to be performed during spacecraft assembly and concerns of risk to flight hardware would likely preclude such measurements. Other features of the spacecraft that impact antenna coverage, such as solar arrays, Technology Survey 29 generally cannot be deployed for measurement. Finally, measurements of the vehicle mounted antennas over the spherical volume required in this application are generally impractical.

The smaller scaled test article is required to result in a potentially practical measurement. When the satellite reaches its on-orbit position, the antenna covering the earth-facing hemisphere can be used. In theory, somewhat higher gain performance can be obtained by switching to an antenna matched to the earth’s field of view for the operational phase of the satellite. In practice, the additional complexities of two sets of antennas and the reliability of necessary switches limit the attractiveness of this approach.

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