Abdullahi, Musa Daji
July 6, 2015
Electric current, magnetic field, magnetic vector potential, potential, radiation
An antenna or aerial is a conducting wire where the current I varies with time and along the length Z of the conductor. The alternating current in an element of length of the wire, constitutes a current element which contributes to the magnetic and electric fields at a point away from the conductor. The resultant field at a point is obtained by integrating for all the infinitesimal current elements along the length of the antenna. The interaction between the alternating magnetic and electric fields, in space, gives rise to transverse electromagnetic radiation propagated at the speed of light. This paper treats a half-wave dipole antenna and derived its maximum radiation resistance as 80 ohms and directivity as 1.5.