Investigation of near fields for shipboard antennas using the numerical electromagnetics code (NEC)

P. Elliniadis, James Kenneth Breakall

    Research output: Contribution to journalConference articlepeer-review


    The numerical electromagnetics code (NEC) was used to evaluate the admittance, the average power gain, and the electric near and far fields of a monopole antenna (λ/5) mounted on a cubical box (λ/3 per side) over a perfectly conducting ground plane. Two models of the box, using surface patches and wire grids, were evaluated. The monopole was positioned at the center, the edge, and at a corner of the box top surface. NEC results were examined and compared with experimental data and with results from 'PATCH' another independent electromagnetic modeling code. Contour and three-dimensional amplitude and phase plots of the near electric fields are presented. Radiation patterns were calculated to relate far-field and near-field behavior of the antenna. It is found that wire grid modeling gave essentially identical results to those using surface patches, attesting to the equivalence of the two numerical techniques in NEC (less than 2 dB differences).

    Original languageEnglish (US)
    Pages (from-to)236-239
    Number of pages4
    JournalIEEE Antennas and Propagation Society, AP-S International Symposium (Digest)
    StatePublished - Dec 1 1989
    EventInternational Symposium Digest - Antennas and Propagation - 1989 - San Jose, CA, USA
    Duration: Jun 26 1989Jun 30 1989

    All Science Journal Classification (ASJC) codes

    • Electrical and Electronic Engineering


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