Demetrius T. Paris’s research while affiliated with Georgia Institute of Technology and other places

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Publications (4)


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

June 1978

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173 Reads

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289 Citations

IEEE Transactions on Antennas and Propagation

Demetrius T. Paris

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W. Leach Jr

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Edward B. Joy

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.


Probe Compensated Near-Field Measurements on a Cylinder

August 1973

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62 Reads

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238 Citations

IEEE Transactions on Antennas and Propagation

A new method is developed for determining the farfield pattern of an antenna from probe compensated near-field measurements over the surface of a right circular cylinder enclosing the antenna. The method is derived by first expanding both the field radiated by the antenna and the field radiated by the measurement probe, when it is used as a transmitter, into cylindrical wave expansions. The Lorentz reciprocity theorem is then used to solve for the field radiated by the antenna from the probe output voltage. It is shown rigorously that the antenna pattern can be determined independently of the characteristics of the measurement probe provided that certain calibration data are known. A method for determining these data from the measured far field radiated by the probe is described. It is shown that the necessary numerical integration can be performed with the fast Fourier transform algorithm. Experimental results are presented to validate the theory and to demonstrate its practicality from a measurement and computational viewpoint.


A Practical Method for Measuring the Complex Polarization Ratio of Arbitrary Antennas

August 1973

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15 Reads

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17 Citations

IEEE Transactions on Antennas and Propagation

A technique for measuring the complex polarization ratio of an arbitrary antenna is presented. The technique requires the use of two antennas which are not circularly polarized but are otherwise arbitrary. Only reciprocity and linearity are assumed. Six amplitude and phase measurements are performed, two measurements for each pair of antennas. The complex polarization ratio of each antenna is then calculated from the six measurements. The specific details of the measurement technique are described and some measurement results presented.


Spatial Sampling and Filtering in Near-Field Measurements

June 1972

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61 Reads

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179 Citations

IEEE Transactions on Antennas and Propagation

A sample spacing criterion and a data minimization technique for measurements made over the surface of a plane in the near field of an antenna are presented. The sample spacing is shown to depend on the distance from the antenna to the measurement plane, and on the extent to which evanescent waves can be neglected. The near-field data minimization technique utilizes two-dimensional spatial filtering to effect a significant reduction in computational effort required to calculate selected portions of the far-field pattern. Far-field patterns of an X band antenna calculated from near-field measurements are presented and compared with those measured on a standard far-field range. The far-field calculations are repeated for several near-field sample spacings and for various post-filter sample rates.

Citations (4)


... 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]. ...

Reference:

Multiprobe Planar Near-field Range Antenna Measurement System with Improved Performance
“Basic Theory of Probe-Compensated Near-Field Measurements”
  • Citing Article
  • June 1978

IEEE Transactions on Antennas and Propagation

... If the polarization state cannot be assumed for any of the antennas in a three-antenna measurement, the approach becomes much more involved. It is, however, possible to use the technique given in [16] and [17] to determine the so-called complex polarization ratios of the three antennas: ...

A Practical Method for Measuring the Complex Polarization Ratio of Arbitrary Antennas
  • Citing Article
  • August 1973

IEEE Transactions on Antennas and Propagation

... 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]. ...

Probe Compensated Near-Field Measurements on a Cylinder
  • Citing Article
  • August 1973

IEEE Transactions on Antennas and Propagation

... In this paper, we report a new method to measure the reflectance of millimeter-wave absorbers. Applying the planar near-field antenna measurement method [19,20], we measure the amplitude [9,16,17] measurement method (horn-to-horn method). A horn antenna illuminates the absorber, and the coupling between the horns is measured. ...

Spatial Sampling and Filtering in Near-Field Measurements
  • Citing Article
  • June 1972

IEEE Transactions on Antennas and Propagation