Modal Beamformers Using Passive Butler Matrices

Abstract

Antennas that have elements placed in a circular fashion require complex beamforming strategies as each element has a different pointing direction and thus the overall radiation pattern cannot be simplified as for planar arrays. However by transforming the circular elements into phase modes using a passive Butler matrix we can create elements that now behave similar to elements in a planar array. In this report we present the final hardware designs for the 4 X 4 and 8 X 8 Butler matrices. We also demonstrate the formation of phase modes from passive beamformers and show the formation of directional beams as well as beams with nulls.

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Document Details

Document Type
Technical Report
Publication Date
Oct 12, 2022
Accession Number
AD1182420

Entities

People

  • Rashmi Mital
  • William R. Pickles

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Electronic Warfare
  • Space

DTIC Thesaurus Topics

  • Acquisition
  • Arrays
  • Beam Steering
  • Department Of Defense
  • Directional
  • Electronic Warfare
  • Fast Fourier Transforms
  • Frequency
  • Frequency Bands
  • Information Operations
  • Insertion Loss
  • Linear Arrays
  • Losses
  • Metal Plates
  • Phased Arrays
  • Radiation
  • Radiation Patterns

Fields of Study

  • Engineering

Readers

  • Phased Array Antenna Design.
  • Systems Analysis and Design