Correct option is A
The
helical antenna is the best structure for generating circularly polarized radiation. This is because:
Helical antenna geometry: It consists of a helical coil of wire wound in the shape of a spring, which inherently produces a rotating electric field.
Circular polarization: Occurs when the electric field rotates in a circular pattern, and this is achieved in helical antennas due to their unique shape and current distribution.
Axial mode operation: When the helical antenna operates in the axial mode (where the radiation is along the axis of the helix), it generates circularly polarized radiation.
Applications: Circular polarization is often required in satellite communication, radar systems, and GPS systems where the orientation of the receiver may vary.
