Input multiplexer has bandpass filters of more than 6 loops, transmission function null points on imaginary frequency axis near pass band to improve edge gradient, less group transition time variation

摘要

The input multiplexer has a bandpass filter per frequency channel. The bandpass filter has more than 6 loops and null points in the transmission function on the imaginary frequency axis near the pass band to improve the edge gradient and lower variation of the group transition time in the pass band achieved with an external transition time corrector or further null points in the transmission function.