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

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

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Example text

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.

En in eqn. 28) can be The excitation field of the form giv- introduced into any equation for current dis- tribution along symmetrically fed distribution determined current needs to dipoles, and the approximate current in a desired manner. 3. Approximations of coaxial-line excitation 47 current is a rapidly varying function along the antenna in this region. For obvious reasons, the antenna current should z satisfying the width of the condition the dl(z)/dzJz=O =0. 28) is the same along the antenna axis.

Eqn. 20). lrz jwlJ ) ()1 g r 2 2 z 1 =z 1 (2. 2. Note that the Approximations of excitation regions resulting impressed field Eirz in eqn. (2. 20). , at the outer magnetic-cur- rent frill edge, while the field due to the frill alone, given by eqn. , for (p=a, z=O). Once the antenna current distribution antenna admittance, defined in terms of is determined, the monopole- the coaxial-line TEM mode, is approximately given by* I(O) y (2. 2 7) v where V is the the antenna current assumed voltage for z=O.

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