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Compact 4 × 4 butler matrix with non‐standard phase differences for IoT applications

Abstract

Butler matrices represent a popular class of feeding networks for antenna arrays. Large dimensions and the lack of flexibility in terms of achievable output phase difference make conventional Butler structures of limited use for modern communication devices. In this work, a compact planar 4 × 4 matrix with non-standard relative phase shifts of –30º, 150º, –120º, and 60º has been proposed. The structure is designed to operate at the centre frequency of 2.45 GHz. Small dimensions of 31.3 mm × 22.9 mm make it useful for Internet of Things applications. The structure operates from 2.35 GHz to 2.55 GHz which covers the industrial, scientific and medical (ISM) bandwidth. At the centre frequency, the measured amplitude and phase imbalance are 1.65 dB and ±4.3º, respectively. The proposed circuit has been compared to the state-of-the-art structures from the literature.

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Details

Category:
Articles
Type:
artykuły w czasopismach
Published in:
ELECTRONICS LETTERS
ISSN: 0013-5194
Language:
English
Publication year:
2021
Bibliographic description:
Bekasiewicz A., Kozieł S.: Compact 4 × 4 butler matrix with non‐standard phase differences for IoT applications// ELECTRONICS LETTERS -, (2021),
DOI:
Digital Object Identifier (open in new tab) 10.1049/ell2.12143
Verified by:
Gdańsk University of Technology

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