University of Oulu

M. Y. Javed, N. Tervo, M. E. Leinonen and A. Pärssinen, "Spatial Interference Reduction by Subarray Stacking in Large Two-Dimensional Antenna Arrays," in IEEE Transactions on Antennas and Propagation, vol. 69, no. 7, pp. 3863-3874, July 2021, doi: 10.1109/TAP.2020.3044687

Spatial interference reduction by subarray stacking in large two-dimensional antenna arrays

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Author: Javed, Muhammad Yasir1; Tervo, Nuutti1; Leinonen, Marko E.1;
Organizations: 1Centre for Wireless Communications - Radio Technologies, University of Oulu, FI-90014 Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 4.2 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2021
Publish Date: 2021-10-11


This article proposes a systematic approach for stacking uniform linear arrays (ULAs) of different sizes to reduce sidelobes and form nulls to the radiated beam pattern. In sidelobe reduction, the nulls and sidelobes of the vertically stacked ULAs are aligned to reduce the overall sidelobe level (SLL). In nulling, the nulls of varying length ULAs are aligned to configure the null direction and simultaneously reduce the sidelobes. Both approaches are relaxed to ensure the feasibility of the implementation. The stacking methods are studied by an extensive set of simulations together with azimuth and elevation beamforming. A sidelobe reduction method showed potential for better than 30 dB SLL and more than 20 dB relative null depth with less than 100 antenna elements. Finally, the concepts are validated by beam pattern measurements of a 28 GHz 64-element, 16-chain phased-array transceiver using a 100 MHz wide 5G waveform.

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Series: IEEE transactions on antennas and propagation
ISSN: 0018-926X
ISSN-E: 1558-2221
ISSN-L: 0018-926X
Volume: 69
Issue: 7
Pages: 3863 - 3874
DOI: 10.1109/TAP.2020.3044687
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This research has been financially supported by Nokia Corporation Ltd, Academy of Finland 6Genesis Flagship (grant 318927) and Business Finland project 5GForce. Keysight Technologies is acknowledged for laboratory equipment.
Academy of Finland Grant Number: 318927
Detailed Information: 318927 (Academy of Finland Funding decision)
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