Question

Polarization loss factor in dB when two linear polarized antennas are rotated by an angle 45° is ___

(a) 3dB

(b) -3dB

(c) 0.5dB

(d) -0.5dB

The question was posed to me by my college director while I was bunking the class.

The question is from Polarization Mismatch in section Radiation, Baluns & Polarization of Antennas

Answer 1

The correct choice is (b) -3dB

For explanation: The polarization loss factor due to mismatch if the two linear polarized antennas are rotated by an angle ∅ is given by PLF = cos^2∅.

⇨ PLF = cos^2∅=cos^2 45=0.5=-3dB.