RLC Electronics' fourth order Bessel Lowpass Filters combine group delay characteristics with rejection characteristics. Maximally flat group delay in the frequency domain is accomplished with the Bessel polynomial, also known as the Thomson Filter. These filters should be regarded as compromise designs for pulsed systems where truthful reproduction of the pulse shape is important. One application for these fourth order Bessel-Thomson lowpass filters is to reduce the impact of higher order distortion and noise in lightwave receivers.
Power rating is 2 watts average, and the filters can use either SMA Female or SMA Male connectors. Impedance is 50 ohms. The filters are specified to operate over a temperature range of 55 ° C to 85 ° C.