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<p>In this work, the design of the LPF/BPF transformation bandpass filter is specifically suitable for wireless communications. The filter utilizes microstrip lines and the defected ground structure (DGS) loaded with lumped capacitors. The overall dimensions of the filter are 20 × 30 <i>mm</i><sup>2</sup>. The design includes Rogers 4003 substrate with a dielectric constant of 3.55 and 0.813-mm thickness. First, the LPF is designed to have a cutoff frequency and attenuation pole at 3.5 and 5.4&#xa0;GHz, respectively. The LPF achieved S<sub>21</sub> ≤ -0.6 dB in the pass band and band rejection ≤ -10 dB from 4.2&#xa0;GHz to 8.17&#xa0;GHz. Moreover, the resulting BPF exhibits a central frequency of 2.45&#xa0;GHz, with a frequency range extended from 2.1 to 2.8&#xa0;GHz (0.7&#xa0;GHz) and the fractional bandwidth (FBW) of 28.57%. The S<sub>11</sub> is nearly − 17 dB, while the S<sub>21</sub> is about − 0.7 dB, with a transmission zero at 3.1&#xa0;GHz and a band stop ≤ -10 dB from 3.1 to 8&#xa0;GHz. The study includes a parametric analysis to achieve the ideal value of S<sub>21</sub> and S<sub>11</sub>. To assess the filter’s behavior, simulations and investigations were implemented using the EM simulator. The achieved outcomes illustrate that the LPF/BPF is appropriate for wireless applications.</p>

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A low pass/Band pass filter transformation using lumped capacitors and DGS configuration for wireless networks

  • 期刊论文

  • 发表日期：

    2025年9月15日

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  • Ashraf E. Ahmed,
  • Wael A.E. Ali,
  • Mohamed I. Shehata,
  • Ahmed A. Ibrahim

摘要

In this work, the design of the LPF/BPF transformation bandpass filter is specifically suitable for wireless communications. The filter utilizes microstrip lines and the defected ground structure (DGS) loaded with lumped capacitors. The overall dimensions of the filter are 20 × 30 mm2. The design includes Rogers 4003 substrate with a dielectric constant of 3.55 and 0.813-mm thickness. First, the LPF is designed to have a cutoff frequency and attenuation pole at 3.5 and 5.4 GHz, respectively. The LPF achieved S21 ≤ -0.6 dB in the pass band and band rejection ≤ -10 dB from 4.2 GHz to 8.17 GHz. Moreover, the resulting BPF exhibits a central frequency of 2.45 GHz, with a frequency range extended from 2.1 to 2.8 GHz (0.7 GHz) and the fractional bandwidth (FBW) of 28.57%. The S11 is nearly − 17 dB, while the S21 is about − 0.7 dB, with a transmission zero at 3.1 GHz and a band stop ≤ -10 dB from 3.1 to 8 GHz. The study includes a parametric analysis to achieve the ideal value of S21 and S11. To assess the filter’s behavior, simulations and investigations were implemented using the EM simulator. The achieved outcomes illustrate that the LPF/BPF is appropriate for wireless applications.