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Wideband Substrate Integrated Waveguide Chip Filter Using Spoof Surface Plasmon Polariton.

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Summary

This study introduces a novel wideband bandpass filter integrating substrate integrated waveguide (SIW) and spoof surface plasmon polariton (SSPP) technologies. The filter achieves a 45.8% fractional bandwidth at 60 GHz with excellent sideband suppression.

Keywords:
integrated passive devicespoof surface plasmon polaritons (SSPPs)substrate integrated waveguide (SIW)through-dielectric capacitor (TDC)

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Area of Science:

  • Electrical Engineering
  • Electromagnetics
  • Microwave Engineering

Background:

  • Substrate Integrated Waveguide (SIW) technology offers low loss and high integration.
  • Spoof Surface Plasmon Polaritons (SSPPs) enable sub-wavelength wave confinement and manipulation.
  • Wideband filters are crucial for modern communication systems.

Purpose of the Study:

  • To propose and design a novel wideband bandpass filter by integrating SIW and SSPP.
  • To achieve flexible control over passband characteristics.
  • To enhance filter performance, including bandwidth and sideband suppression.

Main Methods:

  • Integration of SIW cavities with periodic meander-slot units.
  • Utilizing SSPP structures for wave manipulation.
  • Employing a redistribution layer (RDL) process for 3D capacitive interconnections (Through-Dielectric Capacitor - TDC).
  • Collaborative design of TDC with interdigital capacitors for cross-coupling.

Main Results:

  • The proposed filter operates at a center frequency of 60 GHz.
  • Achieved a wide 3-dB fractional bandwidth of approximately 45.8%.
  • Demonstrated significant sideband suppression with 30 dB rejection at 40 GHz and 75.4 GHz.
  • Obtained a 30-dB rectangular coefficient of 1.28.

Conclusions:

  • The novel integration of SIW and SSPP enables a high-performance wideband bandpass filter.
  • Geometric parameter tuning provides independent control over lower and upper sidebands.
  • The proposed 3D capacitive interconnection enhances filter design flexibility and performance.