Hi Every One...
What is the Difference between wide band antenna and narrow band antenna?
what range of frequency will be called as narrow band and what range for wide band?
I guess thee is no exact consensus on that. Narrow-band antennas are typically resonant (dipoles, cavities) and cover < 5 % bandwidth. Wideband ones are horns and aperture antennas covering >5% bandwidth. Spiral and special antennas are used for ultra-wideband use, like 1 to 20 GHz, etc.