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Differentiate between wide band antenna and narrow band antenna

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Razaali

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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.
 

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