An international intercomparison of horn gain and polarization measurements at X-band has recently been completed. There were seven participating laboratories with the National Institute of Standards and Technology serving as the pilot laboratory. Two X-band pyramidal standard gain horns with a nominal gain of 22 dB served as the traveling standards. Quantities measured included on-axis fixed frequency gain at 8, 10, and 12 GHz, swept frequency gain between 8-12 GHz and polarization characteristics at the three fixed frequencies. All laboratories performed the fixed frequency-gain measurements. The swept-frequency and polarization measurements were optional, with four laboratories performing swept-frequency measurements and three laboratories measuring polarization. The results of the gain measurements generally agreed within the reported uncertainties which were of the order of 0.1 dB or less. INPUT FLANGE NIST INTERCOMPARISON STANDARD Y-AXIS INPUT FLANGE-NIST INTERCOMPARISON STANDARD A larization at X-band has recently been completed. This comparison was initiated in July 1978 by a resolution at a meeting of the High-Frequency Working Group of the Consultative Committee on Electricity of the International of Standards and Technology (NIST), USA, which served as the pilot laboratory. Bureau of Weights and Measures, and designated GT-RF 78-5.

AbstrucrSignificant progress has been made in recent years on planar near-field measurements for antenna calibrations. Such measurements are also useful in the alignment and evaluation of compact ranges because they provide more information than a limited number of analogue plots in one dimension. Contour plots of amplitude and phase data obtained from more complete two-dimensional measurements precisely and accurately locate sources of problems in the range reflector, with phase contour plots being more useful as diagnostic tools.

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The properties of beamwidth, directivity, and polar ization of wavelength-size scalar horns are analyzed and optimized theoretically and confirmed experimentally to determine the usefulness of such horns as standards. Agreement between theoretical predictions and measurements was good.