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Microstrip band-pass filters are essential to RF and microwave communication systems. However, their size can make them incompatible with smaller devices for 5G applications. This chapter presents a method of miniaturizing a microstrip-coupled line band-pass filter using a complementary split-ring resonator (CSRR) for wireless communication, specifically for the FR1 (410 MHz–7.125 GHz) bands of 5G. The miniaturized filter was simulated under CST and manufactured on an FR4 substrate with a ɛr = 4.4 and a height of approximately 1.6 mm. The simulated performance was validated by measurements using a vector network analyzer. The experimental results confirmed the simulations, showing bandwidth behavior around 3.2 GHz with a bandwidth of 389 MHz at −3 dB. The proposed filter measures 43 × 20 × 1.6 mm3. A comparison between the conventional coupled line filter and the one with CSRR shows a significant decrease in size (76%) with satisfactory whitening performance.

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Miniaturization of a Microstrip Band-Pass Filter for 5G Applications in the FR1 Band Using Complementary Split-Ring Resonators (CSRRs)

  • 章节

  • 发表日期：

    2025年

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  • Hanane Nasraoui,
  • Mourad Gourmaj,
  • Naima Dihaji,
  • Youssef Mouzouna,
  • Sudipta Das,
  • Jamal El Aoufi,
  • Ahmed Mouhsen

摘要

Microstrip band-pass filters are essential to RF and microwave communication systems. However, their size can make them incompatible with smaller devices for 5G applications. This chapter presents a method of miniaturizing a microstrip-coupled line band-pass filter using a complementary split-ring resonator (CSRR) for wireless communication, specifically for the FR1 (410 MHz–7.125 GHz) bands of 5G. The miniaturized filter was simulated under CST and manufactured on an FR4 substrate with a ɛr = 4.4 and a height of approximately 1.6 mm. The simulated performance was validated by measurements using a vector network analyzer. The experimental results confirmed the simulations, showing bandwidth behavior around 3.2 GHz with a bandwidth of 389 MHz at −3 dB. The proposed filter measures 43 × 20 × 1.6 mm3. A comparison between the conventional coupled line filter and the one with CSRR shows a significant decrease in size (76%) with satisfactory whitening performance.