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

ISBN-10: 0471900087

ISBN-13: 9780471900085

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

Example text

O o o experimentl7, ----- theory, second degree polynomial approximation of current for case (a) and third degree for case (b), obtained as solution to eqn. (2. 12). 2. Delta-function generator 33 retical current distribution represents quite a good approximation, in spite of very low degree of polynomial approximation of current and the inaccurate model of the excitation region. 4, indicates that solutions of the Hallen equation with simple delta-function generator and polynomial approximation of current of quite low degree (second or third) predict fairly accurately the antenna admittance behaviour as a function of frequency.

The details conHere, only the main idea will be explained and the final conclusions given, illustrated by some numerical examples. Consider first the real coaxial-line excitation of a monopole anten- na, sketched in Fig. 2. 8 (a). In the domain bounded by the surface S , 1 parts of the ground plane and the outer coaxial-line conductor, and the coaxial-line cross-section at complex. For example, in in addition avoid the to the the TEH mode, analysis of z=z , the electromagnetic field is very 0 coaxial line a multitude of modes exists as indicated in the figure.

Pression under the A more complicated ex- integral sign is obtained, but for numerical solu- tion of the equation it is irrelevant, except that programming is somewhat more complicated than in the first case. In the latter case, how- ever, the order of the system of linear equations when using the pointmatching technique is reduced by two, which in some instances can be advantageous. As already pointed out, the end effects are not taken into account in this form of Hallen's equation. If we consider very thin antennas only (in terms of wavelength), we can stipulate that I(z )=I(z )=0, although 1 2 this strictly is never the case.