Question

Directivity and input impedance of a monopole antenna on a large ground plane as compared to that of dipole antenna are:

Answer 1

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The monopole antenna fields below the ground plane in Figure 1(a) are zero. The radiation pattern of monopole antennas above a ground plane are also known from the dipole result. ... For a quarter-wave monopole (L=0.25* ), the impedance is half of that of a half-wave dipole, so Zin = 36.5 + j21.25 Ohms.

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