Radiation Characteristics of Patterns Derived from Shunt-Fed Slanted Dipole Linear Arrays

Abstract

The radiation characteristics of three directional radiation patterns derived from a two-bay horizontal uniform linear array are presented for FM broadcast applications. The bays in the array are the commonly-used shunt-fed, slanted dipoles. Two control factors, distance and phase, are used to shape the patterns. The variation of bay distance and phase without the use of sophisticated and expensive equipment makes the array implementation simple. The theoretical electric field patterns are presented. The horizontally and vertically polarized (H-pol and V-pol) components of the electric field are described together with the power densities created along the horizon. A discussion on the gain characteristics of each pattern as well as the array impedance over the entire FM broadcast band are likewise presented. Based on the computations, the directional patterns produced by the two-bay uniform linear array have maximum gains that are greater than the gain derived from four-bay collinear arrays. The resulting directional patterns also have greater beam widths; no side lobes and pattern nulls are present. Although only the distance and phase control factors are used to shape the pattern of the two-bay linear array, several useful patterns for FM broadcast applications are realized that find practical applications in FM broadcasting.
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