Low-Loss Narrowband Filtering Switch Based on Coaxial Resonators

In this paper, a narrowband filtering switch with low loss and high selectivity is presented based on coaxial resonators for the first time. PIN diodes mounted on the printed circuit boards are embedded into a coaxial filter to enable ON and OFF states. In the ON-state, the PIN diodes are turned OFF...

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Bibliographic Details
Published in:IEEE access 2018-01, Vol.6, p.47717-47722
Main Authors: Li, Hui-Yang, Xu, Jin-Xu, Zhang, Xiu Yin, Zhao, Xiao-Lan
Format: Article
Language:English
Subjects:
Circuit boards
Coaxial resonator
Diodes
filtering switch
Filtration
high Q-factor
high skirt selectivity
Linearity
low loss
Narrowband
Passband
PIN diodes
PIN photodiodes
Resonant frequencies
Resonant frequency
Resonator filters
Resonators
Selectivity
Switches
transmission zeros
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Summary:In this paper, a narrowband filtering switch with low loss and high selectivity is presented based on coaxial resonators for the first time. PIN diodes mounted on the printed circuit boards are embedded into a coaxial filter to enable ON and OFF states. In the ON-state, the PIN diodes are turned OFF, which do not introduce the loss and affect the linearity. Two transmission zeros are generated by a novel feeding structure, which improves the skirt selectivity. In the OFF-state, the PIN diodes are turned on. Then, lumped capacitors are loaded to the coaxial resonators so that the resonant frequencies of the resonators are changed. The passband at the operating frequency cannot be formed, resulting in high isolation. For demonstration, the coaxial-resonator-based filtering switch is designed and fabricated. Good agreement between simulated and measured results verifies the proposed ideas. Comparison with other reported filtering switches is given. The proposed filtering switch shows the advantages of high Q-factor, relatively compact size, and wide stopband responses, which is attractive in wireless systems.
ISSN:2169-3536
2169-3536
DOI:10.1109/ACCESS.2018.2867186