W. Leach Jr’s research while affiliated with Georgia Institute of Technology and other places

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Publications (5)


Comments on Integral equation formulation for probe corrected far-field reconstruction from measurements on a cylinder
  • Article

December 1979

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10 Reads

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1 Citation

IEEE Transactions on Antennas and Propagation

W. Leach Jr

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F. Larsen

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Giorgio V. Borgiotti

First Page of the Article


“Applications of Probe-Compensated Near-Field Measurements”

June 1978

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34 Reads

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143 Citations

IEEE Transactions on Antennas and Propagation

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.


“Basic Theory of Probe-Compensated Near-Field Measurements”

June 1978

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173 Reads

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289 Citations

IEEE Transactions on Antennas and Propagation

The general problem concerning the interaction of a probe antenna with the near field of an arbitrary antenna is considered. The application of the Lorentz reciprocity theorem to the problem of determining antenna characteristics, including the far-field pattern, is presented. The data required to correct for the directional effects of the probe, the effect of probe correction on the measured data, and the attendant mathematical computations in rectangular systems are described. Extensions to cylindrical and spherical systems are discussed.


Design considerations for feedback amplifiers

May 1978

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11 Reads

Circuit design concepts for negative feedback amplifiers are discussed. Preferred circuit architecture for the minimization of transient and static distortions is presented. A discussion of the application of these concepts to audio power amplifiers and phonograph preamplifiers is given.


Correction of near-field acoustic measurements made with arbitrary measuring transducers

May 1978

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8 Reads

This paper concerns the basic acoustics problem of the coupling between the near-field acoustic pressure field radiated by a source and an arbitrary measuring transducer such as a microphone or hydrophone. It is shown that the far-field of a source can be determined independently of the phase and amplitude directional characteristics of the measuring transducer provided that the far-field response of the measuring transducer is known. Solutions to the problem are obtained by an application of Green's theorem to the modal expansions of the acoustic pressure field in rectangular, cylindrical, and spherical coordinate systems.

Citations (2)


... 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]. ...

Reference:

Three-Dimensional Probe Mispositioning Errors Compensation: A Feasibility Study in the Non-Redundant Helicoidal Near to Far-Field Transformation Case
“Applications of Probe-Compensated Near-Field Measurements”
  • Citing Article
  • June 1978

IEEE Transactions on Antennas and Propagation

... In theory, any form of a monochromatic wave, regardless of its arbitrary nature, can be expressed as a superposition of plane waves propagating in diverse directions, each with distinct amplitudes, but sharing a common frequency. The primary objective of this plane wave expansion lies in the determination of the unknown amplitudes and propagation directions associated with these constituent plane waves [5]. ...

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

IEEE Transactions on Antennas and Propagation