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Iversen P.,ORBIT FR Inc. | Boumans M.,Orbit FR Europe GmbH | Burgos S.,Orbit FR Europe GmbH
Proceedings of 6th European Conference on Antennas and Propagation, EuCAP 2012 | Year: 2012

The overall physical dimensions of an antenna measurement facility depend on the largest expected test antenna, typically in the lower frequency band. On the other hand, dimensional tolerances are driven by the high frequencies, where antennas tend to be small. Thus, combining such requirements leads to choose a large and mechanically very accurate test facility in order to meet the electrical and mechanical requirements, which normally is a costly solution. Another approach could be to consider multiple test facilities, each dedicated to a certain category of antennas. For instance, the mini compact ranges proposed by ORBIT/FR offer a complete, self-contained compact range test system targeting smaller aperture antennas. The system's small size, portability and characteristics make it well-suited for automotive radar. In this paper, a mini compact range for automotive radars is proposed as an alternative to the far-field or near-field measurement system. The compact ranges offer higher measurement speed, no need for building a separate anechoic chamber, easy operation, mobility and ruggedness. © 2012 IEEE.

Foged L.J.,SATIMO | Scialacqua L.,SATIMO | Saccardi F.,SATIMO | Mioc F.,SATIMO | And 5 more authors.
2013 7th European Conference on Antennas and Propagation, EuCAP 2013 | Year: 2013

This paper reports the findings of a comparative investigation of two versatile echo suppression techniques applicable to general antenna near field measurement scenarios with echoes of unknown origin. Both techniques are based on spatial filtering of the measured field taking advantage of the apriori knowledge of the antenna size and can be applied to near field measurements in any canonical scan configuration. The first technique takes advantages of the spatial filtering properties of the spherical waves expansion of the measured field. The second method is based on the reconstruction of equivalent currents and implements the spatial filtering as a direct consequence of the selected size and shape of the reconstruction surface. The benefit of using redundant data in both techniques as a mean to achieve further echo reduction in spherical near field scan geometry is examined with particular attention. The investigation has been accomplished with measured data on a SATIMO wideband horn using different sampling of the full sphere. © 2013 EurAAP.

Soerens R.,ORBIT FR Inc. | Aubin J.,ORBIT FR Inc. | Winebrand M.,ORBIT FR Inc. | Foged L.J.,SATIMO | Miller J.J.,Penn State Applied Research Laboratory
IEEE Antennas and Propagation Society, AP-S International Symposium (Digest) | Year: 2011

This paper describes joint efforts undertaken by Penn State University Applied Research Laboratory, the National Institute of Standards, and the Microwave Vision Group, which includes ORBIT/FR Inc. and Satimo. The purpose of this research was to characterize a selected certification method for the performance of the test zone in a large anechoic chamber. The Applied Research Laboratory's chamber in Warminster, PA was selected for this research. © 2011 IEEE.

Foged L.J.,Microwave Vision Italy MVI | Saccardi F.,Microwave Vision Italy MVI | Mioc F.,Microwave Vision Italy MVI | Iversen P.O.,ORBIT FR Inc.
2016 10th European Conference on Antennas and Propagation, EuCAP 2016 | Year: 2016

Spherical Near Field (NF) measurements are widely used in order to accurately characterize the radiating performance of antennas. The main drawback of this type of measurement is the acquisition time that, depending on the electrical size of the Antenna Under Test (AUT), could be very long. This is due to the fact that, in order to correctly evaluate the Far Field (FF) with the NF/FF transformation [1]-[3], the NF has to be sampled over the full sphere with a sampling density that increases with the dimension of the so called AUT minimum sphere [3]. In many spherical NF measurement scenario, it is not possible to locate the AUT in the origin of the measurement sphere resulting in a larger minimum sphere, which implies a denser sampling and a longer acquisition time. An innovative NF/FF technique that allows to drastically reduce the samples density in offset spherical NF measurement is presented in this paper. © 2016 European Association of Antennas and Propagation.

Campbell D.,EM Software and Systems Inc. | Gampala G.,EM Software and Systems Inc. | Reddy C.J.,EM Software and Systems Inc. | Winebrand M.,ORBIT FR Inc. | Aubin J.,ORBIT FR Inc.
Applied Computational Electromagnetics Society Journal | Year: 2013

Advances in computational resources facilitate anechoic chamber modeling and analysis at VHF/UHF frequencies using full-wave solvers available in commercial software such as FEKO. The measurement community has a substantial and increasing interest in utilizing computational electromagnetic (CEM) tools to minimize the financial and real estate resources required to design and construct a custom anechoic chamber without sacrificing performance. A full-wave simulation analysis such as the finite element method (FEM) provides a more accurate solution than the approximations inherent to asymptotic ray-tracing techniques such as physical optics (PO), which have traditionally been exploited to overcome computational resource limitations. An anechoic chamber is simulated with a rectangular down-range cross-section (in contrast with the traditional square cross-section) to utilize the software's capability to assess polarization performance. The absorber layout within the anechoic chamber can be optimized using FEKO for minimal reflections and an acceptable axial ratio in the quiet zone. Numerical results of quiet zone disturbances and axial ratios are included for both low- and medium-gain source antennas over a broad frequency range. © 2013 ACES.

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