JMCER

Design and Simulation of a Quad-Transmission-Zero Microwave Bandpass Filter

  • Received
    March 27, 2025
  • Revised
    June 18, 2025
  • Accepted
    June 23, 2025
  • Published
    July 17, 2025

Authors

  • Thaer A. Sultan
  • Ahmed M. A. Sabaawi

Abstract:
This paper details the design and simulation of a compact microstrip bandpass filter that incorporates four transmission zeros, aiming to significantly enhance its selectivity and stopband performance for diverse modern wireless applications, including 5G networks, radar systems, and satellite communication, by establishing a clear methodology for integrating these zeros into a compact design while maintaining optimal bandwidth and insertion loss. The filter, cantered at 3.5 GHz with a 0.6 GHz bandwidth, employs folded resonators (FRs) for bandwidth control and coupling resonators (CRs) for transmission zero (TZ) generation. Input/output coupling and a zero- degree feed technique are implemented to introduce four TZs, significantly improving stopband performance. Optimization of resonator spacing and feed line positions ensures minimized insertion loss (-1.147 dB) and high return loss (> -40 dB). The proposed microstrip filter, with dimensions of 0.39 λg × 0.46 λg, has been simulated by software ADS using an FR-4 substrate with a thickness of 1.6 mm and a dielectric constant (εr) of 4.3, demonstrating superior performance compared to existing designs, featuring a compact size and enhanced stopband attenuation through the strategic placement of TZs.


Keywords: Microstrip Bandpass Filter, 5G, Compact BPF, Advanced Design System.

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