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High Selectivity Fifth-Order Wideband Bandpass Filters With Multiple Transmission Zeros Based on Transversal Signal-Interaction Concepts

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5 Author(s)
Wen Jie Feng ; Dept. of Commun. Eng., Nanjing Univ. of Sci. & Technol., Nanjing, China ; Wen Quan Che ; Yu Mei Chang ; Su Yang Shi
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Two high selectivity fifth-order wideband bandpass filters (BPFs) with multiple transmission zeros based on transversal signal-interaction concepts are proposed in this paper. Two transmission paths consisting of a shorted stub and two open coupled lines are used to realize signal transmission from Port 1 to Port 2. Two fifth-order wideband passbands with six and ten transmission zeros from 0 GHz to 2f0 (f0 is center frequency of the passband) can be achieved respectively due to the superposition of signals of the two transmission paths. Two prototypes with 3-dB fractional bandwidths of 61.7% (2.07-3.92 GHz) and 48.2% (2.3-3.76 GHz) are designed and fabricated for demonstration. Good agreement can be observed between simulated and measured performances.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:61 ,  Issue: 1 )