Expanding the Working Bandwidth of the Manifold Coupled Multiplexers

This contribution expands the working bandwidth of manifold coupled multiplexers. By inserting bandstop like elements between channel filters and a manifold, the limitation of the spurious mode to the multiplexer bandwidth is removed. An eight-channel Q-band multiplexer using the TE011 mode resonators is designed and fabricated. The measured results verified the proposed method. Keywords─manifold coupled multiplexers, spurious, working bandwidth.