Examples

Free-Space Resin materials (60 - 90 GHz)

Measurement Results

EMラボのフリースペースで樹脂板を測定した例。誘電率（ε'/Dk）の周波数特性が綺麗に確認できる。
EMラボのフリースペースで樹脂板を測定した例。誘電正接（tanδ/Df）の周波数特性が綺麗に確認できる。

Key Point!

  • Ideal for high-loss materials with a dielectric loss tangent (Df) of approximately 0.01 or higher!
  • Even when switching between different setups, measurement continuity is maintained—allowing seamless data acquisition up to 330 GHz without noticeable shifts.
  • Not suitable for low-loss materials (samples must be significantly thicker for accurate results).

The free-space method enables wideband characterization of various materials’ frequency-dependent behavior. We evaluated a range of resins from 60 to 330 GHz. While low-loss materials like PTFE cannot be measured with high accuracy, this method is highly effective for evaluating high-loss materials or those that are difficult to machine into thin samples.

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System Configuration

  • Free space 18-330 GHz FS-330（EM labs）
  • Material Measurement Software FS-MA（EM labs）
  • Network Analyzer：N5290A（Keysight Technologies）
  • Mini VNAX frequency extension module: N5262BW03 (Keysight Technologies)
  • Mini VNAX frequency extension module: N5262BW05 (Keysight Technologies)
  • Mini VNAX frequency extension module: N5262BW06 (Keysight Technologies)

Samples

  • PTFE, Polycarbonate, PVC (2 mm)

-Examples