A Cost-Effective Wideband Switched Beam Antenna System for a Small Cell Base Station

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MARC

Bantavis, P. I. (author)

A Cost-Effective Wideband Switched Beam Antenna System for a Small Cell Base Station

Article/chapterEnglish2018

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Institute of Electrical and Electronics Engineers Inc.2018
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LIBRIS-ID:oai:DiVA.org:kth-247027
https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-247027URI
https://doi.org/10.1109/TAP.2018.2874494DOI

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Language:English
Summary in:English

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

Notes

QC 20190626
A wideband switched beam antenna array system operating from 2 to 5 GHz is presented. It is comprised of a 4 × 1 Vivaldi antenna elements and a 4 × 4 Butler matrix beamformer driven by a digitally controlled double-pole four-throw RF switch. The Butler matrix is implemented on a multilayer structure, using 90° hybrid couplers and 45° phase shifters. For the design of the coupler and phase shifter, we propose a unified methodology applied, but not limited, to elliptically shaped geometries. The multilayer realization enables us to avoid microstrip crossing and supports wideband operation of the beamforming network. To realize the Butler matrix, we introduce a step-by-step and stage-by-stage design methodology that enables accurate balance of the output weights at the antenna ports to achieve a stable beamforming performance. In this paper, we use a Vivaldi antenna element in a linear four-element array, since such element supports wideband and wide-scan angle operation. A soft condition in the form of corrugations is implemented around the periphery of the array, in order to reduce the edge effects. This technique improved the gain, the sidelobes, and helped to obtain back radiation suppression. Finally, impedance loading was also utilized in the two edge elements of the array to improve the active impedance. The proposed system of the Butler matrix in conjunction with the constructed array can be utilized as a common RF front end in a wideband air interface for a small cell 5G application and beyond as it is capable to simultaneously cover all the commercial bands from 2 to 5 GHz.

Subject headings and genre

TEKNIK OCH TEKNOLOGIER Elektroteknik och elektronik hsv//swe
ENGINEERING AND TECHNOLOGY Electrical Engineering, Electronic Engineering, Information Engineering hsv//eng
5G
Butler matrix
edge impedance loading
RF front end
small cell
soft surface
Vivaldi array
wideband
5G mobile communication systems
Antenna lobes
Base stations
Beamforming
Cost effectiveness
Electric connectors
Microwave antennas
Multilayers
Phase shifters
Small cells
Wide-band

Added entries (persons, corporate bodies, meetings, titles ...)

Kolitsidas, ChristosKTH,Elektroteknisk teori och konstruktion(Swepub:kth)u1uy47ub (author)
Empliouk, T. (author)
Le Roy, M. (author)
Jonsson, B. Lars G.KTH,Elektroteknisk teori och konstruktion(Swepub:kth)u12ind03 (author)
Kyriacou, G. A. (author)
KTHElektroteknisk teori och konstruktion (creator_code:org_t)

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In:IEEE Transactions on Antennas and Propagation: Institute of Electrical and Electronics Engineers Inc.66:12, s. 6851-68610018-926X1558-2221

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