Combline filters can be designed to have bandwidths of 1% to 50% of the centre frequency. Centre frequencies in the range of 100MHz to 20GHz are possible with stopbands extending to 5 times f0 . Wider stopbands are achievable with appropriate resonator loading.
Lumped element technology is commonly used in applications where small size is required, especially at lower frequencies where transmission line devices might be excessively large. Both narrowband and broadband designs are available in high pass, low pass, band pass, band stop and multiplexer form.