Adjoint Optimization of Reflectarray Antennas in the Presence of Failures

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Reflectarrays (RA) are frequently being deployed in place of traditional phased arrays due to their advantages of spatial feeding, high gain, and low power consumption. Compared with phased arrays, RA performance is more dependent on the unit cells comprising the array. Thus, it is important to understand the impact that both environmental and systematic failures have on individual unit cells and how these effects translate to reduced array performance. A primary technique to mitigate these failures and extend the lifetime of the array is to retune the remaining working elements to recover the lost performance. A variety of recovery techniques have been investigated and successfully applied to phased arrays using array factor analysis. However, more complex RAs composed of hundreds of elements may not accurately be represented with an array factor. To overcome these complications, we propose the use of adjoint optimization paired with full-wave simulations to efficiently retune RAs affected by random phase failures. We demonstrate an exemplary case that applies this approach to a 625-element offset fed reflector to recover 0.9 dB of 2.9 dB lost from a 24% element failure.

Original languageEnglish (US)
Title of host publication2023 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, AP-S/URSI 2023 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1127-1128
Number of pages2
ISBN (Electronic)9781665442282
DOIs
StatePublished - 2023
Event2023 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, AP-S/URSI 2023 - Portland, United States
Duration: Jul 23 2023Jul 28 2023

Publication series

NameIEEE Antennas and Propagation Society, AP-S International Symposium (Digest)
Volume2023-July
ISSN (Print)1522-3965

Conference

Conference2023 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting, AP-S/URSI 2023
Country/TerritoryUnited States
CityPortland
Period7/23/237/28/23

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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