An antenna for testing immunity of equipment to intentional electromagnetic interference (IEMI) is described, along with simulated and measured test results which show a good agreement and demonstrate the high-voltage operation

Bale, Simon

Dawson, John F.

Dawson, Linda

Hoad, Richard

Hough, Mark

Marvin, Andy

Petit, Barney

Porter, Stuart

Rees, Tim

Robinson, Martin

Will, Iain

White Rose Research Online

This is a repository copy of A 150MHz, High Voltage Mesoband Dipole Antenna for IEMI Testing.White Rose Research Online URL for this paper:https://eprints.whiterose.ac.uk/173671/Version: Accepted VersionProceedings Paper:Bale, Simon, Hoad, Richard, Petit, Barney et al. (8 more authors) (Accepted: 2021) A 150MHz, High Voltage Mesoband Dipole Antenna for IEMI Testing. In: Joint IEEE International Symposium on Electromagnetic Compatibility, Signal Power Integrity and EMC Europe. . (In Press) eprints@whiterose.ac.ukhttps://eprints.whiterose.ac.uk/Reuse Items deposited in White Rose Research Online are protected by copyright, with all rights reserved unless indicated otherwise. They may be downloaded and/or printed for private study, or other acts as permitted by national copyright laws. The publisher or other rights holders may allow further reproduction and re-use of the full text version. This is indicated by the licence information on the White Rose Research Online record for the item. Takedown If you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. A 150MHz, High Voltage Mesoband Dipole Antenna for IEMI Testing Simon Bale 1, Richard Hoad2, Barney Petit2, Tim Rees2, Martin Robinson1, Mark Hough1, Stuart Porter1, Linda Dawson1, Andy Marvin1, John F. Dawson1, and Iain Will1 1Department of Electronic Engineering, University of York, York, UK, email: john.dawson@york.ac.uk 2 QinetiQ, Farnborough, UK, email: BJPETIT@qinetiq.com  Abstract—An antenna for testing immunity of equipment to intentional electromagnetic interference (IEMI) is described, along with simulated and measured test results which show a good agreement and demonstrate the high-voltage operation. I. INTRODUCTION In this paper we present the design simulation and measurement of a high voltage dipole antenna which provides damped sinusoidal pulsed fields working with a pulsed source. The antenna is intended to work with a single pulse generator [1] having a double exponential waveform with a rise-time of 90 ps and FWHH of 2.5 ns and an output amplitude of up to 34 kV. II. ANTENNA DESIGN The initial design was carried out using the CST Microwave studio time domain solver.  Fig. 1. 150MHz dipole under test in QinetiQ’s anechoic chamber  Fig. 2. Cross section of connector transition, low-pass filter and balun A dipole with kite shaped arms was chosen (Fig. 1) as it had a resonant impedance closer to 50 ohms than a simple dipole, thus avoiding the need for a wound or physically large resonant balun to match to the 50 ohm feed. A 3-pole low-pass filter was used to suppress the higher frequency content from the pulse that might excite higher order resonances on the dipole. A simple gapped ferrite core based balun (Fig. 2) was sufficient to achieve the desired performance. The insulators are 3D printed in acrylic resin, with the remainder of the antenna made of aluminium, with copper wire connections. III. RESULTS AND CONCLUSIONS Measurements of the antenna performance were carried out in QinetiQ’s Anechoic chamber using both a Vector network analyser (VNA) and a high voltage pulse source with D-dot sensor and sampling oscilloscope.  Fig. 3. Comparing Dipole antenna numerical model results with VNA and pulse measurement Fig. 3 shows the received pulse scaled to 1 V excitation and 1 m distance. For the frequency domain measurement (VNA V 2/H 1) the pulse response is obtained from the inverse FFT of the transmission measurement convolved with the expected source pulse. Pulse measurements with a 6 kV pulse are also shown (6kV V/H). The measurements are shown with the antenna in vertical and horizontal polarisations, any difference might be attributed to the chamber. In all cases the measurements are adjusted for D-dot sensor, balun and cable losses. The measurements correspond well with the model data.  The antenna was successfully tested with pulsed excitation up to 24kV. A successful antenna design was achieved by simulation. The fabricated version seems to have a slightly larger boresight gain than that predicted but otherwise the performance corresponds well to the model.  REFERENCES [1] R. Hoad, L. Chatt, B. Petit, T. Rees, and G. Eastwood, “Mesoband and Hyperband Immunity Test Generator and Standards,” in AMEREM, 2018. Take-Home Messages:   A high voltage pulse driven 150 MHz Mesoband dipole  Robust simple to build antenna for IEMI testing  Operates from external Broadband pulse generator  Simple high voltage balun and low pass filter  Computational model matches measured results © 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, 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 component of this work in other works.2021 Joint IEEE International Symposium on Electromagnetic Compatibility, Signal and Power Integrity, EMC Europe

A 150MHz, High Voltage Mesoband Dipole Antenna for IEMI Testing

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A 150MHz, High Voltage Mesoband Dipole Antenna for IEMI Testing

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