Ultra-Wideband (UWB) Ring Resonator Bandpass Filter With a Notched Band

  title={Ultra-Wideband (UWB) Ring Resonator Bandpass Filter With a Notched Band},
  author={Chan Ho Kim and Kai Ming Chang},
  journal={IEEE Microwave and Wireless Components Letters},
This letter presents a novel ultra-wideband (UWB) bandpass filter (BPF) with a notched band using a ring resonator. Bandwidths of the ring resonator with two stepped-impedance stubs are calculated by examining the relations between resonant frequencies and the characteristic impedance of the ring. Stepped-impedance ports are used to obtain improved return losses in a high-frequency band. Interdigital-coupled feed lines with an asymmetric structure embedded in the stepped-impedance ports are… CONTINUE READING
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