Accession Number:

AD1182420

Title:

Modal Beamformers Using Passive Butler Matrices

Descriptive Note:

[Technical Report, Memorandum Report]

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON DC

Personal Author(s):

• Mital, Rashmi
• Pickles, William R

Report Date:

2022-10-12

Pagination or Media Count:

35

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.

Descriptors:

Subject Categories:

• Optics
• Electrical and Electronic Equipment

Distribution Statement:

[A, Approved For Public Release]