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Transient radiation of a dipole corresponds to excitation of a spherical harmonic wave in some conical line from an evanescent wave domain. The governing equation contains a cut-off frequency that depends on radius. Using high refraction index material the cut-off frequencies for the radiating mode can be significantly reduced. This can lead to “tunneling” energy from the evanescent region and consequently...
The authors of this work have designed, manufactured, tested and applied an ultra-wideband measurement system (MS) for investigating characteristics of antennas in the operating frequency band of up to 2 GHz. The synamic range of the measured signals is at least 80 dB. The use of fairly strong signals for excitation of radiating antenna extends the power budget by 40 dB else. The absence of reflections...
To solve the problem of transient electromagnetic wave propagation in unbounded nonlinear medium the Modal Basis Method or Method of Evolutionary Equation is used. It consists in conversion of the initial three-dimensional nonstationary problem to one-dimensional one for set of evolutionary equations with initial and boundary conditions. The construction of the analytical solution of a nonlinear problem...
The angle dependence of near field radiated of Hertzian dipole excited by transient current is investigated. The more precise approximation in the solution for near field of the dipole is obtained in time domain by means of vector potential technique. As an example, the quickly decreasing excitation current case is considered.
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