Abstract
The paper proposes a method for separate calculation of the reactive component of the input impedance, radiation resistance and loss resistance small, in comparison with the wavelength of normally open antennas. A detailed equivalent circuit of of the Unbalanced Monopole with Shunt Feed (UMSF). Integral relations are obtained that determine the radiation resistance and the electromotive force of an equivalent generator. The decomposition of the active part of the input resistance into two components, one of which characterizes the radiated power, and the other - thermal losses, allows us to successfully solve both the problem of determining the resistance matching coefficient and the antenna efficiency. The results obtained can be useful in the design of antennas and energy calculations of radio links.
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