MF AM transmitting asymmetric vertical dipole

An asymmetric vertical dipole is proposed as an MF AM-broadcast station transmitting antenna. This kind of vertical dipole antenna uses the supporting guys as part of the radiating structure permitting an efficient radiation with a strong surface wave. It produces less high-angle radiation compared to a classic buried-ground-plane monopole of similar height. Analysis data for near fields and power density of monopoles, elevated ground plane monopoles, and asymmetric vertical dipoles are presented graphically to explain why this last antenna can match the radiation efficiency of the classical monopole without a buried ground plane. Good agreement between calculation and measurements is achieved in all cases studied.<
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