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:: Dielectric Measurement Technique ::
 | Post date: 2019/05/26 | 

Dielectric Measurement Technique

The Standard of The Dielectric Characteristics Measurement of Materials

The laboratory has been able to measure the dielectric characteristics of different materials. The measurement technique according to D5568 is a two-port waveguide measurement method.

Setup test of the dielectric characteristics measurement of materials

Setup test of the dielectric characteristics measurement of materials

The Dielectric Characteristic Measurement Technique of Materials

Rectangular Waveguide Technique: This technique is an example of the categorization of measurement techniques, which is called the transmission line technique for achieving the coefficient of permittivity and complex permeability of the sample. In this technique, the sample is matched to the waveguide cross section and is filled to the same extent, and the return rate is measured over the sample. Transmission line measurement techniques are typically more accurate than single-port technique. This technique is suitable for measuring the complex relative electrical permittivity (relative and loss dielectric constant) and the complex relative magnetic permeability of a solid, isotropic, and non-gyromagnetic response. This measurement is valid for a frequency range of 100 MHz to 20 GHz. This range is not exact and depends on the size of the sample and the size of the rectangular waveguide transmission line of the sample holder. The operating frequency of the frequency depends on the sample size. (Large samples at low frequencies and a small sample for large frequencies). As a non-resonant method, the selection of any number of discrete measurement frequencies will be appropriate in the frequency range. To cover the entire frequency range, several waveguides of different dimensions are required. In general, this test can also be used for circular waveguides.

Tested Sample

  1. Tested Samples should be long enough. (The extent possible to a few thicknesses)
  2. The cutting of Samples either manually or mechanically must be accurate and with no irregular cuts. (The presence of any irregular in size of the Samples causes entrance of additional air (a material with different Dielectric) on the common edges of the sample with the waveguide and affects the results).
  3. Samples should be very clean and free of contamination.
  4. The physical dimensions of the samples should be 22.86mm × 10.16mm.
  5. It is better to have more than two samples from each sample in the dimensions requested.
  6. Depending on the sensitivity of the samples, each sample should be sent in a separate package.
  7. Samples should be sent as smoothly as possible without bending.
An example of measuring the dielectric characteristic of the material

For sample testing it is necessary for samples to be appropriate in size. It should be noted that the laboratory does not have any responsibility for the results obtained from damaged samples and geometric shapes that are not proportional or smaller than the dimensions mentioned.

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