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1 results

  • Wideband quasi-reflectionless bandstop filters using open/shorted coupled lines

  • Yijun Weng, Wenjie Feng, Sha Xu, Gaungxu Shen, Yongrong Shi, Wenquan Che
  • Journal:
    International Journal of Microwave and Wireless Technologies / Volume 15 / Issue 10 / December 2023
    Published online by Cambridge University Press:
    06 June 2023, pp. 1698-1706
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  • Two wideband bandstop filters (BSFs) for single and dual-band are proposed and then extended to reflectionless BSFs based on the analysis from input impedance/admittance perspective. Also, topologies of higher-number-stopband input-reflectionless BSF are provided to broaden the design scope. Open/shorted coupled lines are adopted to obtain multi transmission zeros and desired stopband bandwidth by adjusting the even-/odd-mode impedance of coupled lines. Resistor-loaded coupled lines are connected with Port 1 to absorb unwanted signals and obtain input-reflectionless behavior. For validation of the proposed theory analysis, BSFs with corresponding absorptive prototypes are constructed and measured.