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

Model No. SDPS

With our experience of measuring the electric permittivity of over 1000 samples per year and in developing measurement devices, Keycom offers 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. As well as applying high technology in devices for measuring electric permittivities, Keycom has accumulated considerable experience in measuring electric permittivity, handling over 1000 samples each year. Also, based on its experience developing measurement devices, Keycom offers precise measurement methods and devices and makes it possible to obtain and report values accurately and quickly.

* The device developed by Keycom for the measurement of electrical permittivities has been put forward for JIS standardization.

* Keycom has extensive experience regarding dielectric and magnetic materials and develops practical measurement devices for measuring specific electric and magnetic permittivities with extremely high accuracy. Keycom also develops systems applicable for specific targets, such as flexible boards, semiconductors, thin films, microwave and millimeter-wave boards, microwave and millimeter-wave resonators, and liquids.
-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.

Measurable ranges

Measurable frequencies


Measurable sample shapes

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 is shown. Please do not hesitate to contact us with requests regarding custom samples.).

Examples of measurement objects

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.

Devices developed by Keycom for the measurement of the electric/magnetic permittivities and rates of absorption of radio waves have been standardized by the Japan Industrial Standards (JIS).

→Methods for measuring the dielectric characteristics of fine ceramics in the millimeter-wave region
Part2:Open resonator method -JIS R 1660-2:2004-
→Noise Suppression Sheet for digital devices and equipment 
Part2:Definitions and general Properties -IEC62333-1:2006-05-
Part3:Measuring method-IEC62333-2:2006-05-
→Methods for measuring the rate of absorption of radio waves for wave absorbers in the millimeter-wave region -JIS R 1679:2007-
→Measurement Methods for Reflectivity of Electromagnetic Wave Absorbers in Millimeter Wave Frequency -IEC62431-

Keycom's Measurement Service

Our rich experience in providing measurement services enables us here at Keycom to offer precise measurement methods and equipment that makes it possible to obtain accurate values quickly.

→ Usual delivery period: 1 week (negotiable if express delivery is required)
→ Delivery at the end of the year or other busy periods: 2 weeks (negotiable if express delivery is required)
→ Delivery in the case of time-consuming measurements: 2~3 weeks (negotiable if express delivery is required)

Even in the case of measurements that require complex technology or that are not available at the current time, if such measurements are theoretically possible, Keycom will do its best to realize them by utilizing our experience developing various measurement devices. Please call us for a consultation (note that 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.

Before using our measurement service

Would you please let us know some information about your samples ? For example :

1. Which material properties do you want to measure?
(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.

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?
(Guesses are good, just need an estimate for wavelength considerations)

5. Are there any sample size restrictions (e.g on thickness or volume)?
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?

Here is a Questionnaire sheet to fill out, please use it.
Thank you very much ! Such information helps us measure your samples more smoothly.

Contact Us  FAX:+81- 3-5950-3380 TEL +81-3-5950-3101)
Please feel free to contact us any time, providing the information above (you may omit non-applicable fields).