QWED laboratory
Measurement Services
Precision RF/microwave material characterisation using our family of resonators and fixtures. We measure Dk, Df, conductivity σ, resistivity ρ, and surface resistance (Ω/sq) — with clear reports and fast turnaround.
What we measure
Solid dielectrics
- Parameters: Dk, Df, optional TCK/TCF
- Frequency coverage: 1–170 GHz (method-dependent)
- Methods: SPDR 1.1–15 GHz, FPOR 10–130 GHz, D-Band FPOR TE01δ 1–10 GHz, Q-SCR 10 GHz
Liquids
- Parameters: Dk, Df
- Frequency coverage: 1–50 GHz
- Methods: FPOR liquids 15–50 GHz, DR/Cavity liquids 1–24 GHz
Conductors
- Parameters: σ (conductivity)
- Frequencies: 13.9, 20.4 GHz and 12–50 GHz
- Methods: DR for conductors 13.9/20.4 GHz (optional higher frequencies), FPOR for conductors 12–50 GHz
Semiconductors
- Parameters: σ, ρ, Rs (Ω/sq)
- Frequencies: 5 GHz (other on request) and 1.1–15 GHz
- Methods: SiPDR 5 GHz, SPDR 1.1–15 GHz
Absorbers
- Parameters: Rs (Ω/sq), ρ
- Method: SiPDR 5 GHz
Ferromagnetics
- Parameters: FMR linewidth (ΔH)
- Frequencies: 2-18 GHz
- Methods: MPR Cavity for Ferromagnetics 5 GHz (possible 10 GHz),MPR Subwavelength cavity for Ferromagnetics 5=9 GHz (possible 2-18 GHz)
What you receive
- Report with methodology, conditions, and uncertainty notes
- Extracted parameters (Dk, Df, Rs, σ/ρ etc.) and resonance/Q data
- Charts and tables (vs frequency and/or temperature as applicable)
- Raw data (CSV) on request
- Confidential handling & NDA support
Sample requirements
General
- Provide base material, thickness, dimensions
- Note coatings, porosity, anisotropy or bonding layers
- Provide liquid type and safety datasheet
Solid dielectrics
SPDR
- Planar samples with clean edges
- Thickness: 0.6 – 6 mm (frequency-dependent)
- Diameter: 14 – 120 mm (frequency-dependent)
- For more details check: SPDR.
FPOR
- Discs or sheets: Ø 50 – 150 mm
- Thickness: 1 µm –3 mm
- If anisotropic, specify in-plane axes
- For more details check: FPOR.
TE01δ
- Sample diameter & height: ~0.25–0.6 mm
- Temperature range: -270–125 °C
- For more details check: TE01δ.
Q-SCR
- Planar samples: 40 – 100 mm
- Thickness: up to ~4 mm
- For more details check: Q-SCR.
Liquids
FPOR liquids 15–50 GHz
- Required fluid volume: 100 - 250 ml
- For more details check: FPOR liquids.
DR/Cavity liquids
- Specify test cell volume and material compatibility
- Specify liquid volume
- For more details check: DR/Cavity liquids.
Conductors
DR for Conductors
- Squares samples 23–60 mm;
- thickness: ≥ 3 skin depths (depends on material and frequency) - for more details contact through form below
- State metal type and surface finish; for copper-clad give laminate data (thickness, material)
- For more details check: DR conductors.
FPOR for conductors 12–50 GHz
- Discs Ø150 – 195 mm
- ≥ 5 skin depths (depends on material and frequency) - for more details contact through form below
- Provide target conductivity range if known
- For more details check: FPOR conductors.
Semiconductors
SiPDR
- Planar wafers or filmsp
- Films thickness: from few µm up to ~1 mm
- Diameters: 30–90 mm
- For films on substrates: give substrate Dk (if possible) and thickness
- For more details check: SiPDR.
SPDR
- Planar samples with clean edges
- Thickness: 0.6 – 6 mm (frequency-dependent)
- Diameter: 14 – 120 mm (frequency-dependent)
- For more details check: SPDR.
Absorbers
SiPDR
- Planar wafers or filmsp
- Films thickness: from few µm up to ~1 mm
- Diameters: 30–90 mm
- For films on substrates: give substrate Dk (if possible) and thickness
- For more details check: SiPDR.