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<p>With the rapid development of 5G communications and millimeter-wave RF front-end technologies, microwave integrated systems impose increasingly stringent requirements on power dividers in terms of miniaturization, unequal power-division flexibility, filtering functionality, and port isolation performance. To address the limitations of conventional unequal power dividers in structural compactness and performance balance, this paper proposes an ultra-compact filtering power divider with unequal power-division ratio based on spoof surface plasmon polaritons (SSPPs). By leveraging the strong field confinement and inherent low-pass filtering characteristics of SSPPs, the proposed device integrates filtering and power division functions into a single compact structure, realizing a 1:2 unequal power division with an ultra-compact footprint of only <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\varvec{0.46} \times \varvec{0.82 \lambda _g^2}\)</EquationSource> </InlineEquation>. Furthermore, through optimized structural topology and impedance matching design, the isolation between output ports is significantly enhanced up to 26.5 dB, while excellent transmission characteristics and impedance matching are maintained. The designed power divider integrates ultra-compact size, filtering response, unequal power distribution, and high isolation, making it well suited for applications in 5G RF front-end systems and high-density microwave integrated circuits. The proposed approach provides a feasible and effective solution for the design of high-performance compact unequal filtering power dividers.</p>

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An Ultra-Compact Unequal Power Division Ratio Power Divider Based on Spoof Surface Plasmon Polaritons

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Runfeng Tang,
  • Jianfeng Shi,
  • Wenzhuo Li,
  • Shuyu Li,
  • Zhe Chen

摘要

With the rapid development of 5G communications and millimeter-wave RF front-end technologies, microwave integrated systems impose increasingly stringent requirements on power dividers in terms of miniaturization, unequal power-division flexibility, filtering functionality, and port isolation performance. To address the limitations of conventional unequal power dividers in structural compactness and performance balance, this paper proposes an ultra-compact filtering power divider with unequal power-division ratio based on spoof surface plasmon polaritons (SSPPs). By leveraging the strong field confinement and inherent low-pass filtering characteristics of SSPPs, the proposed device integrates filtering and power division functions into a single compact structure, realizing a 1:2 unequal power division with an ultra-compact footprint of only \(\varvec{0.46} \times \varvec{0.82 \lambda _g^2}\) . Furthermore, through optimized structural topology and impedance matching design, the isolation between output ports is significantly enhanced up to 26.5 dB, while excellent transmission characteristics and impedance matching are maintained. The designed power divider integrates ultra-compact size, filtering response, unequal power distribution, and high isolation, making it well suited for applications in 5G RF front-end systems and high-density microwave integrated circuits. The proposed approach provides a feasible and effective solution for the design of high-performance compact unequal filtering power dividers.