RF Band Pass Filters are high frequency filters that are used to block unwanted signals in the wireless system. Band pass filters have a center frequency and a bandwidth, they only allow signals which lie within the specified bandwidth to pass through. Signals outside this bandwidth are attenuated considerably. When searching or selecting a RF band pass filter, here are the parameters that you should consider:
Type: There are many types of BPF filters - SAW, Cavity, Notch, Ceramic etc. The type can be selected based on the application and configuration of the system where you plan to integrate the filter.
Frequency: The frequency of a BPF filter can be specified in two ways. The first is a simple minimum and maximum frequency - The filter will allow a signal between the min and max frequency to pass and attenuate any signals outside this range. The other way to specify the frequency is to state a center frequency and the bandwidth, the passband can be calculated by min = Center Frequency - BW/2 and max = Center Frequency + BW/2.
Insertion Loss: Every filter no matter how well made will have some loss in the pass band. The lower the insertion loss the better the performance of the filter.
Attenuation/Isolation: This is another very important parameter, it tells you the level attenuation or isolation for any signal outside the pass band.
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