Communication satellite antennas : system architecture, by Robert Dybdal PDF

By Robert Dybdal

A functional method of Antenna expertise For verbal exchange Satellites

This authoritative source discusses antenna expertise for verbal exchange satellites, addressing either the distance and consumer segments. The ebook offers a method view of antenna functions, an outline of assorted antenna applied sciences, and counsel on methodologies for antenna assessment.

Communication satellite tv for pc Antennas starts with an summary of the parameters that represent antennas, and is going directly to conceal the antenna designs, applied sciences, and process architectures required for communique satellite tv for pc platforms. innovations to mitigate interference are lined, and the procedures utilized in the improvement and characterization of antenna platforms are reviewed. become aware of how to:

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

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

Example text

Systematic deviations result in performance loss that can be addressed by examining the effect of systematic phase errors in the aperture distribution on the antenna’s radiation performance. Example values for loss resulting from random phase errors in Fig. 2-5 illustrate the frequency variation of tolerance loss for a range of values. 5 dB, the required tolerance is relaxed to a value of about 1/37 of a wavelength. Space segment antenna requirements can result in aperture diameters whose value exceeds the launch vehicle’s fairing dimensional limitations.

Contamination between mesh elements can produce nonlinear rectification, producing the intermodulation products. The third issue is the mechanical accuracy of the surface. The rms tolerance errors discussed earlier must be met. However, such analyses are based on random surface errors. Design attention must be paid to assure that systematic phase errors do not result from producing the surface from the mesh material. While reflector antennas are commonly used to satisfy high gain requirements, lens antennas offer an alternative technology.

5. R. B. Dybdal and R. H. Ott, “Coherent RF Error Statistics,” IEEE Trans Microwave Theory and Techniques, vol. MTT-34 (December 1986): 1413–1419. 24 Chapter One 6. K. M. Lambert and R. C. Rudduck, “Calculation and Verification of Antenna Temperature for Earth-based Reflector Antennas,” Radio Science, vol. 27, (January–February 1992): 23–30. 7. T. H. Lee, R. C. Rudduck, and K. M. Lambert, “Pattern Measurements of Reflector Antennas in the Compact Range and Validation with Computer Code Simulation,” IEEE Trans Antennas and Propagation, vol.

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