George Pierre Rodrigue’s research while affiliated with Georgia Institute of Technology and other places

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Publications (7)


“Applications of Probe-Compensated Near-Field Measurements”
  • Article

June 1978

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34 Reads

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143 Citations

IEEE Transactions on Antennas and Propagation

E. B. Joy

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W. Leach Jr

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G. P. Rodrigue

The theory of near-field measurements for antenna practitioners is summarized, and the measurement procedures in three coordinate systems, namely rectangular, cylindrical, and spherical are outlined. Specific topics include probe characterization, measurement systems, data reduction, and attendant accuracies. The results of recent studies are also summarized, and some brief remarks on future applications of near-field measurements in the laboratory, the production line, and in field testing and evaluation conclude the paper.


Accuracy of hemispherical far-field patterns determined from near-field measurements

July 1975

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6 Reads

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6 Citations

This paper reports on the accuracy of far-field patterns determined from near-field measurements on a 499 element C-band phased array antenna. Hemispherical far-field patterns were determined from near-field measurements and principle plane cuts of these patterns were compared to the same cuts made on a farfield range. Comparisons are sheen for both the sum and azimuth difference patterns for three scan positions of the phased array.


A study of phased array antenna patterns determined by measurements on a near-field range

March 1975

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14 Reads

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7 Citations

George Pierre Rodrigue

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Edward Bennett Joy

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[...]

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The validity of the near-field measurement technique in the determination of the far-field radiation patterns of large phased arrays is demonstrated. The significance of accurately characterizing the near-field probe at all angles of interest is demonstrated. A new method of processing the Fast Fourier Transform has been developed that allows increased pattern resolution and reduced core memory requirements. The measurement of absolute gain has been carried out by a new approach using a standard gain horn. The accuracy of this method is demonstrated. A computer-aided simulation study of near-field errors has been conducted using an empirical base model for the illumination function determined from measurements in the near field.


Cost comparison of near-field measurements and far-field measurements for far-field patterns

July 1974

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7 Reads

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5 Citations

The cost of antenna pattern measurements for large phased arrays using conventional far-field ranges has been very high. The results of recent work at Georgia Tech have conclusively demonstrated that measurements in the near-field can yield far-field antenna patterns with an accuracy equal to that of a high quality far-field range. The objective of this work is to compare the cost of pattern measurements of large phased arrays by the conventional far-field method to the cost of equivalent near-field measurements. Costs were derived and documented for each measurement approach using a common basis for the estimation.




A study of near-field data handling and probe design techniques

9 Reads

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9 Citations

The ability to fully characterize a probe antenna using a near-field range is demonstrated subject to the conditions that two identical probes are available. A completely general three antenna approach, requiring no such assumptions, appears feasible. Some questions with respect to uniqueness of solution of the three antenna approach remain. Experimental results indicate that at wide angles (approx. 77 deg), considerably below the apparent geometric limit, the planar near-field approach suffers a notable loss of accuracy. Improvements in both hardware and software-techniques to increase the data handling ability of the near-field facility are described.

Citations (3)


... Aiming at gain measurements, the two-antenna method [21], [22], originally defined for measurements in the FF and working with two unknown but identical antennas, has been developed and, later, extended to NF measurements [23, pp. 93-98] [24], [25]. However, and as pointed out in [5], it can neither be considered a rigorous, complete, nor reliable approach. ...

Reference:

Fully Probe-Corrected Near-Field Far-Field Transformations With Unknown Probe Antennas
A study of near-field data handling and probe design techniques
  • Citing Article

... For this reason, the technique is generally applicable for all types of antennas (some examples are shown in Fig. 1.1). Furthermore, spherical near-field systems are cost efficient [16][17][18][19] which makes them an optimal choice for many measurement applications. However, near-field measurements are in general time consuming because the electromagnetic field has to be measured on the complete surface in the near field before it can be transformed to the far field. ...

Cost comparison of near-field measurements and far-field measurements for far-field patterns
  • Citing Conference Paper
  • July 1974

... In such a case, the antenna far-field is achieved by using near to FF (NTFF) transformation techniques, which particularize depending on the specific NF scanning facility adopted for the data collection, which, therefore, can be with planar, cylindrical, or spherical scan. Among these techniques, that using cylindrical scan [11][12][13][14][15][16][17][18][19][20][21] is particularly advisable when characterizing a low-directivity fan beam pattern antenna under test (AUT), as those used in the base stations of the modern mobile communication networks [22] or body-centric communication systems [23]. ...

“Applications of Probe-Compensated Near-Field Measurements”
  • Citing Article
  • June 1978

IEEE Transactions on Antennas and Propagation