On the electromagnetic characteristics of dipole antennas at MF/HF/VHF/UHF

It is shown in this paper that a dipole excited by an iterative classical sinusoidal distribution, is a most efficient radiator of electromagnetic (em) energy particularly when operating at the VHF and UHF with 7% bandwidths. If the operating frequencies are low, dipoles are poor radiators. Consequently, for modern communication systems operating at such low frequencies, the dipoles are unsuitable. Two interesting deductions observed from the results computed when use is made of 300 MHz (0.3GHz) operating frequency, are that the radiation resistance and the directivity are 73 ohms and 1.64, respectively. Some 3-D isometric contour plots simulated and presented here for dipole lengths chosen as 0.5λ, 1λ, 1.5λ and 2λ, respectively, provide perspective images for the sake of further clarity.