Ring Resonator Bandpass Filter With Switchable Bandwidth Using Stepped-Impedance Stubs

@article{Kim2010RingRB,
  title={Ring Resonator Bandpass Filter With Switchable Bandwidth Using Stepped-Impedance Stubs},
  author={Chan Ho Kim and Kai Ming Chang},
  journal={IEEE Transactions on Microwave Theory and Techniques},
  year={2010},
  volume={58},
  pages={3936-3944}
}
This paper presents a novel ring resonator bandpass filter (BPF) with switchable passband bandwidth. Simple techniques for analyzing resonant frequencies and transmission zeros are shown, and the methods of designing the lengths of open, stepped-impedance stubs attached to the ring are introduced to obtain the tunability of the bandwidth. Interdigital-coupled feed lines are used for harmonic suppression by adding transmission zeros outside of the passband, resulting in wide upper and lower… CONTINUE READING
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