Accession Number : ADA181559
Title : Anti-Skywave AM Broadcast Antenna Design.
Descriptive Note : Master's thesis,
Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Personal Author(s) : Hussain,Sarfraz
PDF Url : ADA181559
Report Date : Mar 1987
Pagination or Media Count : 180
Abstract : This thesis investigates the design of an anti-skywave (ASW) AM broadcast antenna. The parameters of a typical AM broadcast antenna are presented first. Then the design proposed is studied by numerical modeling with the Numerical Electromagnetic Code (NEC). Biby's proposed design involves a ring of short radiators with a conventional monopole operating over finite ground. To analyze the behaviour of Biby's proposed ASW antenna, a generic radiator study is conducted to test the ability of different sized radiators to launch the sky wave and the ground wave first as isolated elements and then as closely coupled radiators with cancelling phasing. Finally, some potential candidate structures are proposed for AM broadcast transmission which might achieve the desired characteristics of ground wave enhancement and sky wave suppression. Keywords; Monopole and dipole antennas; Numerical Electromagnetic Code (NEC).
Descriptors : *RADIO BROADCASTING, *SKY WAVES, *SUPPRESSION, *ANTENNA RADIATION PATTERNS, ANTENNAS, CODING, COUPLING(INTERACTION), DIPOLE ANTENNAS, ELECTROMAGNETISM, GROUND LEVEL, GROUND WAVES(ELECTROMAGNETIC), ISOLATION, MATHEMATICAL MODELS, NUMERICAL ANALYSIS, OPTIMIZATION, RINGS, SHORT RANGE(TIME), TRANSMITTANCE, MONOPOLE ANTENNAS, THESES
Subject Categories : Fluid Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE