Occasionally, we want a device to have only one antenna that can operate in several specific bands, as distinct from an antenna which covers a broad range of frequencies.
Designing Multiband Antennas
Tag: Bandwidth
The Chu Limit
The Chu-Herrington theorem states that for an antenna of a given size there is a minimum limit to the Quality Factor (Q). This limit is called the Chu Limit.
ARSI 
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