Realization of transmission zeros for bandpass filter using inductive-coupled stub-loaded resonators
Published online by Cambridge University Press: 20 August 2019
Abstract
This article proposes a bandpass filter with three controllable transmission zeros (TZs) using three inductive-coupled stub-loaded resonators (SLRs). Different from other works, the proposed SLR can create one transmission pole and one TZ. With the TZs above the passband, high stopband rejection level is achieved. Moreover, the K-inverters are realized by short-circuit stubs between two adjacent SLRs. A general synthesis method for this kind of filter is described. For verification, a filter centered at 2.44 GHz with 0.18 GHz bandwidth is designed. The measured results show that the filter has three TZs at 3.1, 3.9, and 5 GHz. With those TZs, the filter's stopband rejection level is greatly improved.
- Type
- Research Papers
- Information
- International Journal of Microwave and Wireless Technologies , Volume 12 , Issue 1 , February 2020 , pp. 34 - 38
- Copyright
- Copyright © Cambridge University Press and the European Microwave Association 2019
References
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