Filtronic have expertise in developing high performance transceivers across a full range of frequency bands. We have particular expertise in mmWave where we have developed the world’s first 40Gbps stratosphere-to-ground link and the worlds first 10Gbps transceiver applied in trackside to train demonstration links.
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.
With the lower power of small cell products, the main drivers to a successful product are compact size, low weight and both high performance and efficiency. The filter has a significant impact on all of these drivers, so it is important to consider these in the technology and design approach of the filters.