DID YOU KNOW? DTIC has over 3.5 million final reports on DoD funded research, development, test, and evaluation activities available to our registered users. Click HERE
to register or log in.
Modal Beamformers Using Passive Butler Matrices
[Technical Report, Memorandum Report]
NAVAL RESEARCH LAB WASHINGTON DC
Pagination or Media Count:
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.
[A, Approved For Public Release]