Original scientific paper
https://doi.org/10.7305/automatika.53-1.162
Radiation Pattern of a Vertical Dipole over Sea and Setup for Measuring thereof
Antonio Šarolić
orcid.org/0000-0001-7941-1977
; Faculty of Electrical Engineering, Mechanical, Engineering and Naval Architecture (FESB), University of Split, Ruđera Boškovića 32, HR-21000 Split, Croatia
Damir Senić
; Faculty of Electrical Engineering, Mechanical, Engineering and Naval Architecture (FESB), University of Split, Ruđera Boškovića 32, HR-21000 Split, Croatia
Zlatko Živković
; Faculty of Electrical Engineering, Mechanical, Engineering and Naval Architecture (FESB), University of Split, Ruđera Boškovića 32, HR-21000 Split, Croatia
Abstract
In this paper, a compact setup for measuring the radiation pattern of an arbitrary positioned antenna above the sea surface is presented. The antenna of interest was a vertical half-wave dipole. Due to impracticalities concerning the measurements using seaborne platforms, the setup was based around a shallow pool filled with actual sea water. The transmitting antenna-under-test (AUT) and the receiving antenna stands were placed on the solid ground, at the opposite sides of the pool, thus ensuring the stable platforms as well as the wave path over sea. The need for precise positioning of the receiving antenna along the circular path was avoided and the straight measurement line was used instead, yielding further simplification of the method. Both antennas were realized as printed half-wave dipoles. The measurements were carried out in ISM frequency band at 2.48 GHz. The chosen frequency enabled the realization of a compact setup for elevation radiation pattern measurements for AUT heights up to 2_ above the sea surface. The measurement results were compared to the theoretical and simulation results for a half-wave dipole over sea, showing a good agreement. Detailed evaluation of the measurement uncertainty was undertaken, indicating the critical points in the realized setup.
Keywords
Antenna above sea surface; Lossy dielectric ground plane; Radiation pattern measurement setup; Vertical half-wave dipole
Hrčak ID:
81300
URI
Publication date:
18.4.2012.
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