4th order tubular Bessel lowpass filters

February 13, 2013 // By Jean-Pierre Joosting
RLC Electronics now offers 4th order tubular Bessel lowpass filters with 3 dB cutoffs from 1 GHz to 22 GHz. Computer design and tubular construction allow us to maintain excellent group delay characteristics with reasonable rejection while extending our 3 dB cutoff approaching 30 Gigabits.

These filters should be regarded as compromise designs for pulsed systems where truthful reproduction of the pulse shape is important. Primarily used on lightwave receivers to reduce the impact of higher order distortion and noise. These high frequency filters are essential for today’s high bit rate applications.

The filters feature 2 W power rating, 50 ohms impedance, temperature rating of -55°C to +85°C and MIL-E-5400, Class 1A environmental conformance.

For example, the LBT-14000 is a 4th order lowpass with a 3 dB point of 14000 MHz and 1 dB point at 0.6 Fc 8400 MHz with a Delta of ±0.4 dB. The maximum overall length for this filter is 1.25 inches.