Question

If the receiving antenna is polarized at 90° with respect to the transmitting antenna, it will receive
1. No signal
2. Minimum signal 
3. Maximum signal
4. Same signal

Answer 1

Correct Answer - Option 1 : No signal

Polarization of wave: 

• It is defined as the time-varying behavior of the electric field strength vector at some fixed point in the space.
• There are three main types of polarisation namely, linear polarisation, circular polarisation, and elliptical polarisation.
• The polarization of an antenna is based on the E-plane orientation of the electromagnetic energy radiated/received by the antenna.
• Most antennas are typically either linearly (horizontal and vertical), or circularly polarized.
• It is important to match the polarization of the RF antenna to that of the incoming signal for maximum signal reception. Otherwise, there is a corresponding decrease in the level of the signal.
• If they were at right angles to one another (i.e. cross-polarised) then, at least in theory, no signal would be received.