What is the difference between yagi antenna and dipole antenna?

Answer 1

I don't think it has. Bandwidth depends on the diameter to length ratio of the antenna. The greater the diameter of the elements the wider the bandwidth. The inductance goes down and the capacitance goes up, giving the antenna a lower Q. the folded dipole has a greater effective diameter (at least double for the same materials). You can increase a normal dipole's bandwidth by increasing the diameter, hence the old time birdcage aerials.

Answer 2

Compared to a simple dipole, a folded dipole antenna has a different radiation

pattern with higher 'gain' in its preferred direction, a balanced feed-point, and

four times the feed-point impedance at resonance.

If those happen to be the characteristics you're looking for in your application,

then the folded dipole is exactly what you need.

Answer 3

It can utilized over a wider range of frequencies.

Answer 4

A yagi is a dipole with one or more DIRECTORS and a REFLECTOR added to it. It makes the dipole more directional and stronger.