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This paper describes a novel, cost-effective, and size efficient ultra-wideband (UWB) microstrip filter. The structure is realized by connecting two microstrip bandpass filters (BPFs) in parallel, creating two passbands and a wide notch. It employs a modified end-coupled and edge-coupled structure for the upper passband and an extended coupled line for the lower passband. Additionally, the lower passband performance and stopband response has been enhanced by incorporating an extended tapered coupled line. Also, due to addition of tapered coupled lines the notch was narrowed, and attenuation level of notch was enhanced. While integration of Defected Ground Structure (DGS) further attenuate the stopband response. The proposed UWB BPF achieves a fractional bandwidth of 122% (2.7 GHz to 11.2 GHz) with amplitude imbalance less than 1 dB. It also achieves a single notch at 6.2 GHz with 14 dB suppression to suppress signal from WLAN band for better performance of the system. The wide stopband extends up to 20 GHz and the filter occupies a size of 0.46 × 0.41 \( {\lambda}_g^2 \) .

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A Cost-Effective Compact UWB Microstrip Filter with Single Notch and Wide Stopband Using Coupled Lines

  • 会议论文

  • 发表日期：

    2026年

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  • Priyansha Bhowmik,
  • Medhabi Debnath

摘要

This paper describes a novel, cost-effective, and size efficient ultra-wideband (UWB) microstrip filter. The structure is realized by connecting two microstrip bandpass filters (BPFs) in parallel, creating two passbands and a wide notch. It employs a modified end-coupled and edge-coupled structure for the upper passband and an extended coupled line for the lower passband. Additionally, the lower passband performance and stopband response has been enhanced by incorporating an extended tapered coupled line. Also, due to addition of tapered coupled lines the notch was narrowed, and attenuation level of notch was enhanced. While integration of Defected Ground Structure (DGS) further attenuate the stopband response. The proposed UWB BPF achieves a fractional bandwidth of 122% (2.7 GHz to 11.2 GHz) with amplitude imbalance less than 1 dB. It also achieves a single notch at 6.2 GHz with 14 dB suppression to suppress signal from WLAN band for better performance of the system. The wide stopband extends up to 20 GHz and the filter occupies a size of 0.46 × 0.41 \( {\lambda}_g^2 \) .