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<p>This paper presents a planar multimodal periodic filter that is constructed from alternating sections of coplanar stripline and the odd-mode of a finite-ground plane coplanar waveguide constructed on a 1 µm silicon nitride substrate to facilitate operation at THz frequencies. The multimodal configuration differs from standard single-mode periodic filters and enables flexible designs and the possibility for active control of the filter characteristics. For this proof-of-concept, we present the relevant theory and design procedures required to develop a band-stop filter that has a center frequency of <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10762_2025_1056_Article_IEq1.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="16" /> </InlineMediaObject> <EquationSource Format="TEX">\( f_{\text {c}} \)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>f</mi> <mtext>c</mtext> </msub> </math></EquationSource> </InlineEquation> = 0.8 THz and a bandwidth of <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10762_2025_1056_Article_IEq2.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="26" /> </InlineMediaObject> <EquationSource Format="TEX">\( \Delta f \)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="normal">Δ</mi> <mi>f</mi> </mrow> </math></EquationSource> </InlineEquation> = 0.07 THz. We find good agreement between theory, simulation, and experiment.</p>

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Demonstration of a Planar Multimodal Periodic Filter at THz Frequencies

  • 期刊论文

  • 发表日期：

    2025年6月4日

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  • Ali Dehghanian,
  • Mohsen Haghighat,
  • Thomas Darcie,
  • Levi Smith

摘要

This paper presents a planar multimodal periodic filter that is constructed from alternating sections of coplanar stripline and the odd-mode of a finite-ground plane coplanar waveguide constructed on a 1 µm silicon nitride substrate to facilitate operation at THz frequencies. The multimodal configuration differs from standard single-mode periodic filters and enables flexible designs and the possibility for active control of the filter characteristics. For this proof-of-concept, we present the relevant theory and design procedures required to develop a band-stop filter that has a center frequency of \( f_{\text {c}} \) f c = 0.8 THz and a bandwidth of \( \Delta f \) Δ f = 0.07 THz. We find good agreement between theory, simulation, and experiment.