KEYCOM provides solutions in the 300 GHz to 1 μHz frequency range (SHF/EHF/MW/UHF/VHF/ULF).
We undertake designing, manufacturing and measuring. Please feel free to contact us.

Dielectric constant (permittivity, εr') and
Dielectric loss tangent (tan δ)
Measurement Service
(VHF/UHF/microwave/millimeter-wave)

Model No. SDPS
Extensive experience enables smooth and high quality measurements

With our experience of measuring the electric permittivity of over 1000 samples per year and in developing measurement devices, KEYCOM can offer precise measurement methods and devices that make it possible to obtain accurate values quickly.

Devices developed by KEYCOM for the measurement of the specific electric permittivities and rates of absorption of radio waves have been standardized by IEC and JIS.

👉 If you are interested in our original measurement system, please check here

  • High measurement accuracy: ±1%
  • Non destructive　
  • Submillimeter ultra-thin membrane can be measured.
  • Various specimen forms such as solid, sheet, film, powder, liquid (oil), multi-layered can be measured.
  • Measurement frequency range: 10 μHz -110 GHz （using several systems）

*Capable to measure Electrical resistance, Conductivity(An electric conductivity) etc.

Measurement Coverage

Measurement Frequencies

100Hz ～ 110GHz(170GHz)

Measurable Sample Shape

Solid, thin film, ultra thin film (film), multilayer structure (multilayer body), and Phantom, noise control seat, liquid, and fine particle and others (Only basic information shown here).
Please feel free to contact us with requests regarding custom samples.

Examples of Measurement Materials

PTFE (teflon), PFA, FEP, ETFE, polyimide, nylon, polyurethane, polyethylene, PVC, high purity alumina, sapphire, fused silica, ceramics, silicon base, insulation film, and [poriamidoimido], ethanol, the glass, sodium, PET, polyamide, methanol, and ester, etc.

Conforming Standards

Service Deliverly Date

In the case of difficult / advanced measurement

KEYCOM will do its best to perform, by utilizing our experience developing various measurement devices. Please feel free to contact us for consultation (Note:the delivery period is longer than usual, at 3 weeks or more).

Example: Measurement method developed in November 2005→ measurement of the electric permittivity and the dielectric tangent for ultrathin films (0.01μm) with low-frequency waves.

Necessary Information

Before using our measurement service, we would like you to let us know some information about your samples via e-mail( info@keycom.co.jp )

Example of Information

Information listed below is very useful for us to implement measurement smoothly.

Of course, you do NOT need to answer all the questions that are unclear.

  1. Which material properties do you want to measure?
    2. (ex. relative permittivity and dielectric loss tangent, magnetic property / permeability(μr’), Reflection / absorption characteristics, Transmission attenuation, shield effect, electrical conductivity etc...)
  2. Which frequency range do you want to measure?
  3. Please describe your specimen in detail.
    4. A. Is the material a solid/liquid/powder?
    B. Is the material homogeneous (consistent throughout) or isotropic (materials properties are orientation independent)?
    C. Are you interested in looking to test meta-materials?
    D. Is the material magnetic or non-magnetic?
    E. Is the material conductive? If so, what are the expected values of conductivity?
  4. What are anticipated values of εr, µr, and loss tangent?
    5. (Guesses are good, just need an estimate for wavelength considerations)
  5. Are there any sample size restrictions (e.g on thickness or volume)?
    6. Can you change and adjust a size of your sample?

  6. Do you have the capabilities to perform, or know someone who can, precision machining if your material is solid? Note: For liquids you will need to contain them in a sample holder of some sort, of your own design.
  7. Is there any temperature requirement?
  8. Do you have any existing equipment in the lab that you use for similar materials testing? If so, what do you have?