Question

A uniform plane wave traveling along the negative z-axis given by

Incident Wave 7 ん crossed-dipole antenna

impinges upon an crossed-dipole antenna consisting of two identical dipoles, one directed along the x-axis and the other directed along the y-axis, both fed with the same amplitude. The y-directed dipole is fed with a 90◦ phase lead compared to the x-directed dipole.

(a) Write an expression for the polarization unit vector of the incident wave.
(b) Write an expression for the polarization unit vector of the receiving antenna along the + z-axis.
(c) For the incident wave, state the following:
1. Polarization (linear, circular, elliptical) and axial ratio.
2. Rotation of the polarization vector (CW, CCW).

(d) For the receiving antenna, state the following:

1. Polarization (linear, circular, elliptical) and axial ratio.
2. Rotation of the polarization vector (CW, CCW).
(e) Determine the polarization loss factor (dimensionless and in dB) between the incident
wave and the receiving antenna.

Answer 1

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