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Miniaturized spoof SPPs filter based on multiple resonators or 5G applications.

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This study introduces a compact band-pass filter using spoof surface plasmon polaritons (SSPPs) for 5G. The novel design, featuring L-shaped grooves and stub resonators, enables efficient filtering and miniaturization for future wireless applications.

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Area of Science:

  • Electromagnetics
  • Metamaterials
  • Microwave Engineering

Background:

  • 5G technology demands compact and efficient filtering solutions.
  • Spoof surface plasmon polaritons (SSPPs) offer a promising approach for miniaturized high-frequency circuits.
  • Existing SSPP designs often lack efficient integration and tunable filtering capabilities.

Purpose of the Study:

  • To propose a novel and compact band-pass filter utilizing the SSPPs concept for 5G applications.
  • To design a miniaturized SSPP transmission line (TL) with a low cut-off frequency.
  • To develop a method for blocking specific frequency bands using stub resonators within the SSPP TL.

Main Methods:

  • Design and analysis of an SSPPs unit cell with L-shaped grooves and its equivalent circuit model.
  • Dispersion analysis to determine the effect of geometry on cut-off frequency.
  • Integration of mode convertors for efficient coplanar waveguide to SSPP TL connection.
  • Loading SSPP TL unit cells with stub resonators for frequency band rejection.
  • Design of a band-pass filter by connecting stub resonators with varying lengths.

Main Results:

  • The L-shaped groove geometry significantly reduces the cut-off frequency of the SSPPs unit cell.
  • A miniaturized SSPP TL with a cut-off frequency of 29.5 GHz was successfully designed.
  • An equivalent circuit model accurately predicts the rejected frequency range of the stub-loaded SSPP TL.
  • A band-pass filter operating from 26.5-29.5 GHz was fabricated and validated through simulation and measurement, showing good agreement.
  • The proposed groundless SSPP TL and filter structures demonstrate potential for groundless 5G applications.

Conclusions:

  • The novel SSPPs unit cell and filter design offer a compact and efficient solution for 5G frequency filtering.
  • The proposed stub resonator loading method provides effective frequency band blocking.
  • The developed groundless SSPP structures are highly promising for the advancement of miniaturized 5G devices and systems.