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Experimental comparison of absorber and conductive floor automotive near field antenna measurement systems

Published online by Cambridge University Press:  20 October 2021

F. Saccardi Open the ORCID record for F. Saccardi [Opens in a new window] ,
F. Mioc ,
A. Scannavini ,
P. O. Iversen ,
J. Estrada ,
M. Edgerton ,
J. A. Graham  and
L. J. Foged
F. Saccardi*
Affiliation:
Microwave Vision Italy SRL, Via dei Castelli Romani 59, 00071, Pomezia, Italy
F. Mioc
Affiliation:
Microwave Vision Italy SRL, Via dei Castelli Romani 59, 00071, Pomezia, Italy
A. Scannavini
Affiliation:
Microwave Vision Italy SRL, Via dei Castelli Romani 59, 00071, Pomezia, Italy
P. O. Iversen
Affiliation:
Orbit/FR's Corporate HQ, 650 Louis Drive Suite 100, 18974 Warminster, PA, USA
J. Estrada
Affiliation:
MVG Inc., 450 Franklin Gateway Suite 100, 30067 Marietta, GA, USA
M. Edgerton
Affiliation:
GM Proving Ground, 3300 General Motors Rd, 48380, Milford, MI, USA
J. A. Graham
Affiliation:
GM Technical Fellow Antenna Development and Performance (Retired), Linden, Michigan (MI), USA
L. J. Foged
Affiliation:
Microwave Vision Italy SRL, Via dei Castelli Romani 59, 00071, Pomezia, Italy
*
Author for correspondence: F. Saccardi, E-mail: francesco.saccardi@mvg-world.com
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Abstract

Large truncated spherical near-field systems with conductive or absorbing floors are typically used in the measurement of the performances of vehicle-installed antennas. The main advantage of conductive floor systems is the ease of accommodation of the vehicle under test, but their performances are affected by the interaction with the reflecting ground floor. Instead, absorbing-based systems emulating free-space conditions minimize the effect of the interaction with the floor, but generally require longer setup times, especially at lower frequencies (70–400 MHz), where bulky absorbers are typically used to improve reflectivity levels. Considering scaled measurements of a vehicle model, the performances of these two typical implementations are analyzed in the 84–1500 MHz range and compared to free-space measurements. Absorbers with different dimensions and reflectivity have been installed in the scaled measurement setup, and measured data have been investigated with proper post-processing to verify the applicability to realistic systems. Figures of merit of interest for automotive applications, like gain and partial radiated powers, have been compared to free-space to evaluate the impact of different scenarios.

Keywords

Automotivespherical near fieldmulti-probeabsorbersperfect electric conductorground planetruncation
Type
EuCAP 2020
Information
International Journal of Microwave and Wireless Technologies , Volume 14 , Special Issue 6: EuCAP 2020 Special Issue , July 2022 , pp. 689 - 700
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press in association with the European Microwave Association

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References

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