A bstract-Expressions which relate the signal-to-noise ratio in the near field to the signal-to-noise ratio (WN) in the far field are developed. The expressions are then used to predict errors in far-field patterns obtained from near-field data. A technique to measure the noise in the far-field pattern is also given.

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.

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Abstract-Computer programs are presently in existence to calculate the coupling loss between two antennas provided that the amplitude and phase of the far field are available. However, for many antennas the complex far field is not known accurately. In such cases it is nevertheless

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