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Synthesis Design of Ultra-Wideband Bandpass Filters With Designable Transmission Poles

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3 Author(s)
Rui Li ; Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore ; Sheng Sun ; Lei Zhu

A class of ultra-wideband (UWB) bandpass filters (BPFs) with designable transmission poles is presented. Transmission poles are controlled in number by introducing m-section non-uniform transmission line in the center of a transmission-line multiple mode resonator. With the help of increased transmission poles, the constituted filter achieves deeper rejection skirts and wider bandwidths. In the design, a synthesis approach is developed to synthesize this filter with the target of Chebyshev equal-ripple frequency responses. As an example, a six-pole UWB BPF is implemented on hybrid microstrip line and slotline structures. The measured results validate and confirm the theoretical prediction.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:19 ,  Issue: 5 )