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An investigation of near fields for HF shipboard antennas: surface PATCH and wire grid modeling using the Numerical Electromagnetics Code

Approved for public release; distribution is unlimited / The Numerical Electromagnetics Code (NEC) was used to evaluate the admittance, average power gain, and the electric near and far field of a monopole antenna mounted on a cubical box over a perfectly conducting ground plane. Two models of the box, employing surface patches and wire grids, were evaluated. The monopole was positioned at the center, the edge, and at a corner of the box's top surface. Admittance and average power gain of the antenna were calculated. NEC results were examined and compared with experimental data and with results from "PATCH", another independent electromagnetic modeling code. The near electric field was calculated for both models. Computer graphics techniques were presented for plotting NEC near field results using DISSPLA (Display Integrated Software System and Plotting Language), a commercial graphics package. Contour and 3-D amplitude, and phase plots of the near electric fields were presented. Radiation patterns were calculated to relate far field and near field behavior of the antenna. Surface patch and wire grid models are compared and conclusions were presented. / Naval Ocean Systems Center / http://archive.org/details/investigationofn00elli / O&MN, Direct Funding / Lieutenant, Hellenic Navy

Identiferoai:union.ndltd.org:nps.edu/oai:calhoun.nps.edu:10945/23280
Date12 1900
CreatorsElliniadis, Panagiotis
ContributorsAdler, Richard W., Breakall, James K., Naval Postgraduate School (U.S.), Electrical and Computer Engineering
PublisherMonterey, California. Naval Postgraduate School
Source SetsNaval Postgraduate School
Languageen_US
Detected LanguageEnglish
TypeThesis
Formatapplication/pdf
RightsCopyright is reserved by the copyright owner

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