Ball, E. orcid.org/0000-0002-6283-5949 and Tennant, A. (2020) A technique to control the harmonic levels in time modulated antenna arrays - theoretical concept and hardware verification platform. IEEE Transactions on Antennas and Propagation, 68 (7). pp. 5375-5386. ISSN 0018-926X
Abstract
This paper presents techniques into prediction and control of the radiated harmonic levels in time modulated antenna arrays (TMAs). The effect of ramping on the controlling switching waveform, due to slew in the RF switches, is analyzed first. This is followed by a novel technique for controlling and reducing the fundamental carrier component (due to the Fourier series 0 Hz term) that is always produced by TMAs. A new bespoke, steerable, TMA RF hardware test platform is presented, using three gain states to pragmatically implement the proposed carrier reduction technique. The platform implementation utilizes binary logic control interfaces to the TMA, rather than analogue control interfaces. Laboratory measurements using the test platform demonstrate a 16.5dB reduction (limited by PCB emissions) in the level of the fundamental carrier component relative to the steered first harmonic, from a possible reduction of 21.3dB. The array gain for the first harmonic beam is 2dBi.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | Time Modulated Antenna Arrays; Fourier series; RF hardware platform; Microwave circuits |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 03 Mar 2020 11:45 |
Last Modified: | 09 Dec 2021 13:00 |
Status: | Published |
Publisher: | Institute of Electrical and Electronics Engineers |
Refereed: | Yes |
Identification Number: | 10.1109/TAP.2020.2978894 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:157906 |