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The problem of electromagnetic wave excitation by a vibrators system with variable distributed surface impedance located in free space is solved by the generalized method of induced electromotive forces (EMF). The characteristics of three-element and multi-element Yagi-Uda antennas with variable impedance vibrators are calculated.
A mathematical model of a radiating structure consisting of an narrow arc slot cut in a perfectly conducting sphere and two radially oriented impedance monopoles located on the sphere. Formulary relations for radiation fields of the spherical antenna at an arbitrary point of observation were obtained based on external electrodynamic problem solution by the generalized method of induced electro-magneto-motive...
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