By B.D. Popovic, etc., M.B. Dragovic, A.R. Djordjevic
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Extra resources for Analysis and Synthesis of Wire Antennas (Electronic & Electrical Engineering Research Studies)
3a, and the monopole had a hemispherical cap. 020 FIG. 2. 7. :Jmponen t of the normalized electric field in the excitation region of a vertical monopole driven by a coaxial 1 ine. Small circles indicate the positions of matching points which are not masked by the graph. Imaginary part is several times smaller in magnitude. (Ref. 25) 42 part of the monopole. 2. Approximations of excitation regions Both the current and its first derivative were be continuous functions along the polynomial approximation were cap, where a z-axis.
Region are very close sufficient accuracy consequence of 1, for almost all If kb<<1, both yield results of practical applications. This is a very similar impressed electric fields due to these two generator models, than in all cases. 10. or if higher accuracy is If kb is not much smaller needed, the theory presented in the following subsection may be used. 2. 3. 3. means Higher-order approximations of coaxial-line excitation by 29 of wave modes. We have seen that, at lower frequencies, the TEH approximation of both the electric and magnetic field at the coaxial-line opening, given in eqns.
For example, if the antenna is in the form of a rod with flat ends, we have small radial currents on the flat caps, going to zero only at the center of the caps. A certain correc- tion is obtained if the antenna is assumed to be for a/2 longer at each end in the case of flat caps, because such an additional antenna length has the mately same area as the the antenna flat ends and, presumably, approxi- same charges are localized on the two surfaces. If the an- tenna ends are hemispherical, the real length of the antenna, including the caps, can be approximately taken as the antenna length in Halle'n 1 s equation, because the area of the hemispherical cap is exactly equal to that of the curved part These corrections are of a right cylinder of radius a and length a.