High Selectivity Wideband Bandpass Filter Based on Transversal Signal-Interaction Concepts Loaded with Open and Shorted Stubs.

A new design of high selectivity wideband bandpass filter based on transversal signalinteraction concepts loaded with open and shorted stubs is proposed in this paper. Two transmission paths are used to realize signal transmission. Path 1 is composed of a T-shaped structure with shorted stub, and Path 2 consists of two open coupled lines loaded with open stubs. A wide five-order passband and high selectivity stopband with four transmission zeros can be achieved in the proposed filter. Finally, a wideband bandpass filter operating at 3GHz with 3-dB fractional bandwidth of 83.3% (1.55 to 4.05 GHz) is designed, fabricated, and measured. Good agreement between the simulation and experiment is obtained. [ABSTRACT FROM AUTHOR]