Antenna Systems
In the field of antennas, two different methods of expressing relative bandwidth are used for narrowband and wideband antennas. For either, a set of criteria is established to define the extents of the bandwidth, such as input impedance, pattern, or polarization.
Percent bandwidth, usually used for narrowband antennas, is used defined as . The theoretical limit to percent bandwidth is 200%, which occurs for .
Fractional bandwidth or Ratio bandwidth, usually used for wideband antennas, is defined as and is typically presented in the form of . Fractional bandwidth is used for wideband antennas because of the compression of the percent bandwidth that occurs mathematically with percent bandwidths above 100%, which corresponds to a fractional bandwidth of 3:1.
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Read more about this topic: Bandwidth (signal Processing)
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