Q-choke Split Cylinder Resonator (Q-SCR)

for precise measurements
of thin & thick materials
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Q-choke SCR*

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Overcoming sample thickness limitations of known solutions

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Applicable to thin & thick materials (e.g. thin foils, bumper plaques,

vacuum windows, 3D printed materials, etc.)

Q-SCR 10GHz operation parameters:
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10 GHz (higher frequencies coming soon...)

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Dk = 1 - 15

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Df > 10-6

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accuracy:

δDk < 0.2%
δDf < 2%
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high repeatability:

for COP 187µm, Dk=3.347,
→ st. dev.=0.0002
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sample dimensions:

min 40 x 40 mm
max 100 x 100 mm
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thickness:

Up to 4 mm for low-loss materials (e.g. sapphire)
Q-SCR 10GHz measurement procedure

Equipped with dedicated software:

automating and controlling the measurement

extracting the dielectric constant (Dk) and dissipation factor (Df) of the material under test

Two-step measurement procedure:

resonant frequency and quality factor measured for an empty closed Q-SCR device

resonant frequency and quality factor measured for a sample-loaded Q-SCR

measured frequency shift and quality factor change are used to extract Dk and Df

*uncertainty of Dk extraction is due to sample thickness variation
*M. Celuch, M. Olszewska-Placha, L. Nowicki and W. Gwarek, "A Novel Q-Choked Resonator for Microwave Material Measurements Alleviating Sample Thickness Limitations of Existing Techniques," in IEEE Microwave and Wireless Technology Letters, vol. 34, no. 6, pp. 845-848, June 2024