Accession Number : ADA134596

Title :   Channel Tracking Errors and the Adaptive Multiple-Beam Antenna.

Descriptive Note : Technical rept.,

Corporate Author : MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s) : Burrows,Michael L

PDF Url : ADA134596

Report Date : 09 Sep 1983

Pagination or Media Count : 40

Abstract : The ability of an adaptive antenna to reject wide-band interference sources is limited by the differences between the transfer functions of the different channels. An examination of the quantitative relationship between the rejection and the tracking errors shows that the multiple-beam antenna (MBA) achieves greater rejection than an array antenna. This is because, in forming a null in the direction of an interference source, the MBA achieves much of its total rejection by simply turning off the channel principally affected by the source. The array, on the other hand, must depend upon cancellation between channels to provide all its rejection. A simple formula exists, and is presented in the test, relating the interference cancellation to the rms mismatch between the channel transfer functions. (Author)

Descriptors :   *Directional antennas, *Adaptive systems, *Suppressors, *Radiofrequency interference, *Tracking, *Channels, Antenna arrays, Cancellation, Interference, Transfer functions, Multiple beams(Radiation), Transfer functions, Sources, Formulations, Quantitative analysis, Broadband, Errors, Antennas

Subject Categories : Electrical and Electronic Equipment
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE