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<p>Currently, the design of reflectionless filters faces the challenges of insufficient selectivity and insufficient flatness. Therefore, we propose a two-port microstrip reflectionless bandpass filter topology to provide a reference for the design of the above challenges. The topology of this microstrip circuit consists of two parallel coupled microstrip lines, which are connected by two short stubs, and a pair of symmetrical bandstop filters (BSFs) connected in parallel, with resistors in the filters used to absorb signals that cannot be transmitted. By analyzing and converting the lumped-element filter with transmission zeros, a microstrip bandpass filter with high selectivity was achieved. Furthermore, the design process proposed in this paper can meet different requirements for center frequency and bandwidth, offering greater flexibility compared to other design methods. To validate this design, a microstrip bandpass filter with a center frequency of 2.5&#xa0;GHz was developed. The measurement results show that the 3-dB passband bandwidth reaches 38.4%, and the filter exhibits high selectivity and a flat passband response. The BPF exhibits a 10-dB reflection bandwidth of 263% and an out-of-band rejection of more than 30&#xa0;dB.</p>

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Reflectionless Bandpass Filter with Flat Passband, High Selectivity, and Enhanced Out-of-Band Suppression

  • 期刊论文

  • 发表日期：

    2025年11月7日

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  • WenLiang Wu,
  • Wei Chen,
  • Mingshan Xia

摘要

Currently, the design of reflectionless filters faces the challenges of insufficient selectivity and insufficient flatness. Therefore, we propose a two-port microstrip reflectionless bandpass filter topology to provide a reference for the design of the above challenges. The topology of this microstrip circuit consists of two parallel coupled microstrip lines, which are connected by two short stubs, and a pair of symmetrical bandstop filters (BSFs) connected in parallel, with resistors in the filters used to absorb signals that cannot be transmitted. By analyzing and converting the lumped-element filter with transmission zeros, a microstrip bandpass filter with high selectivity was achieved. Furthermore, the design process proposed in this paper can meet different requirements for center frequency and bandwidth, offering greater flexibility compared to other design methods. To validate this design, a microstrip bandpass filter with a center frequency of 2.5 GHz was developed. The measurement results show that the 3-dB passband bandwidth reaches 38.4%, and the filter exhibits high selectivity and a flat passband response. The BPF exhibits a 10-dB reflection bandwidth of 263% and an out-of-band rejection of more than 30 dB.