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By B.D. Popovic, etc., M.B. Dragovic, A.R. Djordjevic

ISBN-10: 0471900087

ISBN-13: 9780471900085

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Extra resources for Analysis and Synthesis of Wire Antennas (Electronic & Electrical Engineering Research Studies)

Example text

Is the tation z-componen t of the total electric field, region, for a point-matching polynomial (E +E. 5. 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.

5, we need to evaluate only the Eiz compo- z-axis, because E. (O,z)=O. 19) noting that now r=(p +z) . 2. <2 + z ) and rb = (b The equivalent dipole antenna 2 2 Y, + z ) . 6(b) can next be analysed by any of the equations presented in Section 1. 20). As a consequence of the annular magnetic-current frill excitation, current derivative has a discontinuity at the frill location. The val- ue of the derivative (di/dz)Jz=O+ is uniquely determined by the coaxialline dimensions and below. This fact the voltage at must be the line opening, as demonstrated taken into account in a numerical solution for stable and accurate results in this case to be obtained.

52- jO. 54 0. 68 * In Reference 17 two sets of results for admittances of isolated monopole antennas driven by a coaxial line are given. The first set corresponds to admittances of antennas as elements terminating the coaxial line. In the second set these values are corrected as proposed by King to take approximately into account the influence on the antenna susceptance of the specific coaxial line used in measurements as contrasted to the delta-function excitation. In this section it was natural to use the latter set of results, but the first set was used with more accurate approximations of coaxial-line excitation (see Table 2.

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Analysis and Synthesis of Wire Antennas (Electronic & Electrical Engineering Research Studies) by B.D. Popovic, etc., M.B. Dragovic, A.R. Djordjevic

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