Bandwidth Limitations on Achievable Cancellation for Adaptive Nulling Systems.

Abstract

This technical note examines in detail the various limitations which influence the amount of cancellation achievable for a closed-loop type adaptive nulling system operating over a non-zero bandwidth. These limitations are categorized according to antenna limitations, and post-antenna channel tracking limitations. The former tend to be RF percentage bandwidth limited and the latter on the achievable component tolerances used to implement the channel (whether at RF or a lower IF). Both of these factors, and their influence on the nulling bandwidth, are examined in detail. Measured results are also presented for a seven-beam paraboloid-reflector type multiple-beam antenna (MBA), and the effects of feed-reflector multipath inherent in this geometry on the cancellation bandwidth is evaluated in detail. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Feb 17, 1978
Accession Number
ADA054160

Entities

People

  • Joseph T. Mayhan

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Air Platforms
  • Space

DTIC Thesaurus Topics

  • Antenna Configurations
  • Antenna Radiation Patterns
  • Antennas
  • Bandwidth
  • Beam Steering
  • Broadband
  • Cancellation
  • Dynamic Range
  • Eigenvalues
  • Equations
  • Frequency
  • Frequency Response
  • Geometry
  • Multiple Beam Antennas
  • Narrowband
  • Radiation Patterns
  • Spectra

Readers

  • Phased Array Antenna Design.
  • Systems Analysis and Design