On the Impact of Non-Rectangular Two Dimensional Near-Field Filter Functions in Planar Near-Field Antenna Measurements

Author: Daniël Janse van Rensburg
Publication: AMTA 2006
Copyright Owner: NSI-MI Technologies

In this paper a circular planar near-field scan region is considered as an alternative to the commonly used rectangular boundary. It is shown how the selection of this alternative boundary can reduce test time and also to what extent the alternative truncation boundary will affect far-field accuracy. It is also shown how well known single dimensional filter functions can be applied over a two-dimensional region of test and how these attenuate the truncation effect. The boundary and filter functions are applied to measured data sets, acquisition time reduction is demonstrated and the impact on far-field radiation pattern integrity in assessed.

Reducing Measurement Time and Estimated Uncertainties for the NIST 18 Term Error Technique

Authors: Allen Newell, Zachary Newbold
Publication: AMTA 2006
Copyright Owner: NSI-MI Technologies

This paper describes some improvements in the measurement process of the NIST 18 term error analysis that reduces the required measurement time and also improves the sensitivity of some of the tests to the individual sources of uncertainty. As a result, the measurement time is reduced by about 40 % and some of the estimated uncertainties are also improved without a reduction in the confidence levels. The reduction in measurements is accomplished by using one measurement for two or more error terms or using centerline rather than full 2D data scans for some of the terms.

Reduction of Truncation Error in the Near-Field-Far-Field Transformation with Planar Spiral Scanning

Authors: F. D’Agostino, F. Ferrara, C. Gennarelli, R. Guerriero, G. Riccio, C. Rizzo
Publication: AMTA 2006
Copyright Owner: University of Salerno

An elaborate and effective strategy for estimating the samples external to the measurement region in the planar spiral scanning is developed in this paper. It relies on the nonredundant sampling representations of the electromagnetic field and on the optimal sampling interpolation expansions of central type and uses the singular value decomposition method for extrapolating the outside samples. It is so possible to reduce the inevitable truncation error affecting the near-field reconstruction, thus giving rise to a more accurate far-field prediction. Numerical examples assess the effectiveness of the proposed technique.

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Copyright 2006 The University of Salerno. Reprinted from AMTA 2006 Conference

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Results of A New RF Cable Correction Method

Authors: Scott McBride, David Musser
Publication: AMTA 2006
Copyright Owner: NSI-MI Technologies

As an RF cable is moved during data acquisition, its insertion loss will often change. Techniques have been published that measure and compensate those changes in insertion loss. Each of these techniques, however, requires stable access to both the signal source and the receiver at one end of the cable bundle. This requirement poses a challenge when trying to compensate a moving RF cable between a receive antenna and a mixer where there are additional axes below the mixer. This paper will show measured results of a new technique developed by MI Technologies to do similar compensation where the source and receiver are at opposite ends of the moving (or otherwise changing) cable bundle. The technique was developed for transmission efficiency measurements on radomes, but also has applicability for quiet-zone field probing or any other scenario where a strong signal is always being received. It requires the use of multiple identical RF cables in the cable bundle, and measures multiple cable combinations to determine the cable characteristics.

Simplified Spherical Near-Field Accuracy Assessment

Authors: Greg Hindman, Allen C. Newell
Publication: AMTA 2006
Copyright Owner: NSI-MI Technologies

Spherical near-field measurements have become a common way to assess performance of a wide variety of antennas. Published reports on range error assessments for spherical near-field ranges however are not very common. This is likely due to the perceived additional complexity of the spherical near-field measurement process as compared to planar or cylindrical measurement techniques. This paper will establish and demonstrate a simple procedure for characterizing the performance of a spherical near-field range. The measurement steps and reporting can be largely automated with careful attention to the test process. We will summarize the process and document the accuracy of a spherical near-field test range at NSI using the same NIST 18 terms commonly used for planar near-field measurements.

The Impact of Local Area Networks on Antenna Measurement Range Design

Authors: Marion C. Baggett
Publication: AMTA 2006
Copyright Owner: NSI-MI Technologies

The increasing numbers of microwave instruments and devices that include IEEE 802.3 interfaces are influencing range design and capabilities, as well as the ability to remotely locate GPIB instruments. The major benefits of LAN based instrumentation systems are increased flexibility in instrument location and increased capabilities over long distances compared to GPIB based ranges. This paper discusses the relative merits of LAN based microwave test instrumentation ranges. Several example range designs are included that demonstrate how LAN based instrumentation can increase range flexibility and reduce costs in range implementation.

The ISOFILTERTM Technique: Extension to Transverse Offsets

Author: Doren W. Hess
Publication: AMTA 2006
Copyright Owner: NSI-MI Technologies

The IsoFilterTM Technique is a novel method of isolating the radiation pattern of an individual radiator from among a composite set of radiators that form a complex radiation distribution. This paper demonstrates that the technique is viable and applicable to cases where the individual radiator of interest is near the boundary of the minimum sphere that encloses the entire collection of sources.

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