Multiple choice

Two identical antennas are placed in the $\theta$= $\dfrac{\pi}{2}$ plane as shown in figure. The elements have equal amplitude excitation with 180° polarity difference, operating at wavelength $\lambda$. The correct value of the magnitude of the far-zone resultant electric field strength normalized with that of a single element, both computed for $\phi$= 0, is

  1. 2 cos $\left( \dfrac{2\pi s}{\lambda} \right)$
  2. 2 sin $\left( \dfrac{2\pi s}{\lambda} \right)$
  3. 2 cos $\left( \dfrac{\pi s}{\lambda} \right)$
  4. 2 sin $\left( \dfrac{\pi s}{\lambda} \right)$
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D Correct answer
Explanation

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