Accession Number : AD0760687

Title :   Amplitude and Phase Response of Freeboard-Mounted Ship Antennas.

Descriptive Note : Research and Development rept.,

Corporate Author : NAVAL ELECTRONICS LAB CENTER SAN DIEGO CALIF

Personal Author(s) : Francis,G. P. ; Marx,D. H.

Report Date : 15 MAY 1973

Pagination or Media Count : 23

Abstract : Phase and amplitude data were measured on 20 Half-loop antennas mounted around the freeboard of a 1/48-scale model of a Gearing Class destroyer, at 56 scaled, hf frequencies and at two elevations. Data are presented in the form of 3-dimensional surface plots. Amplitude surfaces were shown to behave similarly as the elevation of the test signal is increased from 4.5 to 30.0 degrees while the other variables are held constant. The surfaces are fairly smooth at low frequencies but become more irregular at higher frequencies. Maximum amplitude was observed when the plane of the illuminating signal contained, or was close to containing, the beam axis of the ship and the illuminator was on the same side of the ship as the antenna. (Author)

Descriptors :   (*SHIP ANTENNAS, SHIP HULLS), ANTENNA RADIATION PATTERNS, PHASE MEASUREMENT, POLARIZATION, DESTROYERS, MODEL TESTS, VERY HIGH FREQUENCY

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE