List of top Electronics and Communication Engineering Questions on Antennas and Wave Propagation

For a lossy transmission line, the characteristic impedance does not depend on
A rectangular waveguide with dimensions \(a=2.5\) cm, \(b=1\) cm is operating below 15 GHz. If the guide is filled with a medium characterized by \(\sigma=0\), \(\epsilon=4\epsilon_0\), \(\mu_r=1\), calculate the cutoff frequency of dominant mode?
Find the maximum gain of a \(\frac{\lambda}{2}\) wire dipole operating at 30 MHz?
The S-parameters are used at microwave frequencies because of the following reasons, except
The fraction of time that the transmitter is transmitting during one radar cycle is called
Identify the polarisation of the wave given, \(E_x=2\cos\omega t\), \(E_y=2\sin\omega t\) and the phase difference is \(+90^\circ\)

The array factor of an N element linear uniform array is \(\newline\) (\(\Psi = \beta d \cos\theta + \alpha\), \(\beta = \frac{2\pi}{\lambda}\), d = spacing between elements and \(\alpha\) = inter element phase shift)

If a small single-turn loop antenna has a radiation resistance of 0.04 \(\Omega\), how many turns are needed to produce a radiation resistance of 1 \(\Omega\)?
The far field of an antenna varies with distance r as
What is the nature of radiation pattern of an isotropic antenna?