RETURN PATH ATTENUATION FILTER

摘要

The present invention is a passive filter (10) for controlling the return path loss in a communication system having a forward path and return path. The filter (10) comprises first and second terminals, a passive filter network (36, 38), and a compensation circuit. The passive filter network (36, 38) is coupled to the first and second terminals and to ground. The filter network (36, 38) has a first passband which passes signals in the forward path and a second passband which passes signals in the return path. The filter network (36, 38) includes a passive attenuator network (40) which attenuates signals in the return path by a predetermined amount as the signals pass through the second passband. The compensation circuit (40) is coupled to the passive filter network (36, 38), and is configured to compensate for expected perturbations in the frequency response of the second passband of the filter network (36, 38).