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The capacity of a transmitting system to concentrate the radiation in a desired direction is well described by means of the directivity. Its knowledge is very important when using the radiating structure for specialized and high-performance communication links. The computation of the total radiated power, which is obtained by integrating the radiation intensity on the far-field (FF) spherical surface,...
The Near-Field - Far-Field (NF-FF) transformation technique with plane-rectangular scanning is undoubtedly the most simple and efficient one from the analytical and computational viewpoints. However, the antenna far field can be reconstructed only in a cone with an apex angle less than 180° unless repeating the measurements. Accordingly, such a scanning is particularly suitable for highly directive...
Measurement techniques in the antenna near-field (NF) region have a significant role in the evaluation of far-field (FF) patterns. In fact, for electrically large antennas the required size of the conventional FF range becomes prohibitively large. Moreover, NF facilities provide a controlled and secure environment, and all weather capability. Among the NF-FF transformation techniques, that employing...
As well known, the directivity value associated to a radiating system denotes its capacity to concentrate the electromagnetic radiation in a desired direction. The computation of the total radiated power, which is obtained by integrating the radiation intensity on the far field (FF) spherical surface, represents the crucial point in the directivity evaluation. The full numerical integration can be...
Among the near field-far field (NF-FF) transformation techniques, that employing the bi-polar scanning, proposed by Rahmat-Samii et al. in [1], is particularly attractive due to its peculiar characteristics. In such a scanning, the antenna under test (AUT) rotates axially, whereas the probe is attached to the end of an arm which rotates around an axis parallel to the AUT one. This allows one to collect...
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