Linear Wire Antennas Lecture
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Questions and Answers

In the current distribution for a half-wave dipole antenna, where is the highest current amplitude located?

  • At the center
  • At a quarter of the total length
  • At one end (correct)
  • At three-quarters of the total length

For a dipole antenna with length $3λ/2$, what is the current distribution at three-quarters of the total length?

  • $-I_°$
  • $2I_°$
  • $0$ (correct)
  • $I_°$

What is the length of the dipole antenna being considered in the given example?

  • $l = \lambda/2$
  • $l = 2\lambda$
  • $l = 3\lambda/2$ (correct)
  • $l = \lambda$

What is the maximum value of $\cos(3\pi/2\cos\theta)$?

<p>1 (A)</p> Signup and view all the answers

At what values of $\theta$ does the electric field pattern have a minimum?

<p>$\theta = 70.5^\circ, 0^\circ$ (C)</p> Signup and view all the answers

What is the expression for the electric field pattern of the $3\lambda/2$ dipole antenna?

<p>$E_\theta = j\eta(I_0e^{-j\beta r})/2\pi r [\cos(3\pi/2\cos\theta)/\sin\theta]$ (C)</p> Signup and view all the answers

What is the value of $\beta$ used in the electric field expression?

<p>$\beta = 2\pi/\lambda$ (D)</p> Signup and view all the answers

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