Design and Expeiments of the Short Back-fire Antenna Composed of Two-stacked Circular-loop Yagi-Uda Array and a Reflector Plate in UHF TV Band

Abstract

A short back-fire antenna combined with a two-stacked circular loop Yagi-Uda array antenna with a metal reflector plate is analyzed by a proposed theoretical model.
Several computed curves for two-element back-fire antennas are given, and the values computed for current distributions and radiation characteristics are substantiated by experiments. Radiation characteristics are investigated to obtain a desirable configuration.
Optimum spacing L, between stacked loops, and optimum distance d, between the Yagi-Uda array antenna and metal reflector plate, are discussed in detail. and An optimally configured two-element Yagi-Uda two-stacked circular loop array back-fire antenna is experimentally examined.