1. Super High-Selectivity Fifth-Order Bandpass Filter with Twelve Transmission Zeros
- Author
-
Yijun Cai, F.-Y. Zhang, Kai-Da Xu, and D.-H. Li
- Subjects
coupled lines ,020208 electrical & electronic engineering ,High selectivity ,02 engineering and technology ,transmission poles ,Topology ,Transmission zeros ,high-selectivity ,03 medical and health sciences ,0302 clinical medicine ,Band-pass filter ,transmission zeros ,Order (business) ,0202 electrical engineering, electronic engineering, information engineering ,Bandpass filter ,Electrical and Electronic Engineering ,030217 neurology & neurosurgery ,Mathematics - Abstract
A fifth-order bandpass filter (BPF) with super high selectivity using three pairs of coupled lines and two open stubs is proposed. Twelve transmission zeros (TZs) from 0 to 2f_0 (f_0 denotes center frequency of the passband) and five transmission poles (TPs) in the passband can be obtained to realize good out-of-band suppression and sharp roll-off skirts. For demonstration, a simple BPF prototype centered at 2.04 GHz is designed, fabricated with measured 3-dB fractional bandwidth of 18% and very high transition band roll-off rates of over 567 dB/GHz. Good agreement between the simulations and measurements validates the design method.
- Published
- 2018
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