A COMPARISON OF MODELLED AND MEASURED HF ANTENNA ARRAY PATTERNS

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Authors
  1. Jenkins, R.W.
  2. Petrie, L.E.
Corporate Authors
Communications Research Centre, Ottawa ONT (CAN);Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
The relative-phase response and gain patterns found by numerical modeling of an HF antenna array of vertical whip antennas were compared with the patterns found by actual measurements. While some features of the measured patterns agree with the model, other significant features did not. The disagreement could be due to ground inhomogeneities and other local features as well as differences between the actual and modeled antenna array such as discrepancies in antenna position and orientation, poor connections to ground radials, and differences in the modeled and actual antenna loading. In most cases where the elements were closely spaced, numerical modeling provided a somewhat better estimate of the antenna gain and relative-phase response patterns than the simple assumption of azimuth-independent gains and a relative phase response consistent with a spherical wavefront centered on the transmitter. However, for more remote antenna elements, modeling did not provide a better estimate; nor did it provide a better estimate for the lowest modeled frequency. Actual pattern measurements, on the other hand provided significantly better pattern estimates in all cases.
Keywords
NEC modeling;HF antenna patterns;Vertical whip antennas
Report Number
CRC-96-002 — Technical Note
Date of publication
01 Sep 1996
Number of Pages
29
DSTKIM No
97-01777
CANDIS No
502025
Format(s):
Hardcopy;Document Image stored on Optical Disk

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