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.

Frequency change Method,
Free Space Type
Dielectric Constant, Dielectric Loss Tangent, Transmission attenuation
(Permittivity, Dk/Df) Measurement equipment

Model No. DPS10
Without Anechoic chamber ! Accurate solution !! Suitable for measurement of emblem, radome, tough and thick materials, metamateriasls etc.

Free-space S-parameter measurement system for Dk/Df. It doesn't require anechoic chamber.
Applicable to the specimen tough to cut (ex. heneycomb material, metamaterial, etc.) or thick.
Dk/Df is obtained from a relation between frequency and transmission attenuation amount which are recorded when electric wave transmits a sample plate.
Different from coaxial tube type and waveguide type, you don't need to set a sample in a fixture, errors caused from air gap won't occur.
And as you can set a sample near antenna, you don't need to provide a large sample.
There is a type of this device which can measure wave absorptance (rate of absorption).
Please see this page also : Multilayer plate Simulation software for making designs of emblem and radome.


*Measured value is accurate.
*The measurement is very simple. Sparameter method needs TRL calibration and it's time-consuming. But as for this frequency change method, you can do measurement just after 0 calibration.
*That's why you can check anisotropy of materials freely. Most of materials have anisotropy.
*Though you see ingredients of your materials are uniformly distributed, in fact, they may be not. In such case, you can check the fact quickly.
*Compared with other measurement solutions, this method can reduce limitations in test pieces. You can prepare specimens easily.


Frequency 2.6GHz~18GHz, 18GH~110GHz
※ A measurement frequency range in which the actual measurement value and simulation value corresponds.
Please see antennas' frequency ranges below.
εr' 1.5~150
Precision(repeatability) : ±1% or ±0.01(depend on network analyzer's performance)
Precision + accuracy(to true value)(based on PTFE) : ±3%(depend on measurement theory and design of positioning tool)
tan δ 0.0002~20
Precision(repeatability) : ±2%(depend on network analyzer's performance)
Precision + accurace(to true value)(based on PTFE) : ±5% or ±0.0001(depend on measurement theory and design of positioning tool)
Size of specimen 600mm x 600mm or more @2.6GHz
150mm x 150mm or more @18GHz
80mm x 80mm or more @76.5GHz
Thickness of specimen 1mm ~
Please prepare a specimen with the thickness through which electromagnetic wave can enough attenuate
Specimens Resin, glass, GFRP, Honeycomb materials, wood, cement, metamateials, etc..

Data example (English available)


Specimen PTFE
Thickness 4.5mm
Frequency around 80GHz (70GHz~90GHz)
Result εr' 2.05
tanδ 0.0004


Specimen Polycarbonate
Thickness 4.95mm
Frequency around 50GHz (40GHz~60GHz)
Result εr' 2.60
tanδ 0.006






LAF-26.5A, LAF-26.5B

LAF-26.5A   LAF-26.5B

Order information - Model No.

Name Specifications Model No.
Main body for 18GHz~110GHz DPS10-01
  for 2.6GHz~18GHz DPS10-03
  for 18GHz~110GHz DPS10-02
  for 2.6GHz~26.5GHz(Electric Wave Absorber, Return Loss Measurement System EAS03) LAF-2.6A+
  for 26.5GHz~110GHz(Electric Wave Absorber, Return Loss Measurement System EAS03) LAF-26.5A
(with coaxial waveguide converter)
2 sets required
1.70-2.60GHz (WR-430) RH430S14SMA(f)7
  2.60-3.95GHz (WR-284) Rh284S14SMA(f)7
  3.95-5.85GHz (WR-187) RH187S16SMA(f)7
  4.90-7.05GHz (WR-159) RH159S17SMA(f)7
  5.85-8.2GHz (WR-137) RH137S18SMA(f)7
  8.2-12.4GHz (WR-90) RH90S19SMA(f)7
  12.4-18GHz (WR-62) RH62S22SMA(f)7
  18-26.5GHz (WR-42) RH42S23SMA(f)7
  33-50GHz (WR-22) RH22R23APC2.4(f)7
  26.5-40GHz (WR-28) RH28S23SMA(f)7
(with waveguide)
2 sets required
50-75GHz (WR-15) RH15S10
  75-110GHz (WR-10) RH10S10
  110-170GHz (WR-6) RH06S10
  170-260GHz (WR-4) RH04S10
  20-325GHz (WR-3) RH03S10
Calculation softwere Software for Frequency Change Method DMP-002040619-01
Multilayer plate Simulation software for making designs of emblem and radome Can estimate the return loss of absorption materials with a single layer of any thickness from the measured complex εr and complex μr. SFW05
Coaxial cable for measurement Two cables ex)CM06D-APC2.9(m)APC2.9(m)-1000
GPIB cable   GP-01
Networkanalyzer Available upon request .
Please request the model of your choice.
Windows PC (installation and usage instruction service)   CP