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Dielectric Constant & Loss Tangent Test System

The dielectric constant (usually denoted by ε) and the loss tangent (tanδ) are key parameters that describe the electromagnetic properties of materials. They are crucial for understanding how materials interact with electromagnetic fields. The importance of these parameters is reflected in the following aspects:

Electromagnetic Field Influence and Energy Variation

The real part of the dielectric constant (ε') represents the material's ability to store electromagnetic energy, while the imaginary part (ε'') reflects the degree to which the material dissipates electromagnetic energy. Together, these two components provide insight into the material's behavior in an electromagnetic field.

Wide Range of Application Fields

Different industries have varying requirements for the dielectric constant and loss tangent of materials:

  • In the electronics industry, these parameters are critical for the design and optimization of components such as capacitors and PCB antennas.
  • In the aerospace/defense industry, the development of radar-absorbing materials and stealth technologies relies heavily on precise control of material electromagnetic properties.
  • In the industrial materials field, whether for ceramics, polymers, or biomaterials, accurate measurement of dielectric properties is essential to ensure the performance of the final products.
  • Fields such as food preservation research, pharmaceutical development, and exploration of new materials also depend on a thorough understanding of material electromagnetic characteristics.

Specific Application Requirements

  • In the aerospace and defense sectors, radar-absorbing materials and stealth materials are designed using microwave-absorbing materials to control radar reflection or achieve invisibility effects.
  • In electronic communications, it is necessary to evaluate the impact of devices such as mobile phones on the human body (e.g., SAR values), which also involves in-depth analysis of material electromagnetic properties.

Material Selection and Optimization

Understanding a material's dielectric constant and loss tangent helps in selecting the best candidate from a wide range of materials, and also provides guidance for the design of new materials. For example, to improve the performance of a certain electronic device, it may be necessary to choose a material with a specific dielectric constant value for use as a substrate or other components.

In summary, testing of the dielectric constant and loss tangent not only enables researchers to gain a deeper understanding of a material’s fundamental physical properties, but also plays an irreplaceable role in driving technological innovation and development across multiple industries.

This test system is designed to provide accurate measurement solutions for the dielectric constant (ε) and loss tangent (tanδ) of various materials. The system offers multiple testing methods to accommodate different material characteristics and application requirements:
  • Coaxial Probe Method: Suitable for broadband, non-destructive testing of liquids, semi-solid substances, and smooth insulating materials.
  • Transmission Line Method: Includes coaxial air line and waveguide fixtures, ideal for materials with higher loss, such as radar-absorbing materials, and capable of measuring both dielectric constant and permeability simultaneously.
  • Free-Space Method: A non-contact testing method suitable for flat materials under high-temperature conditions, covering a frequency range from 18 GHz to 330 GHz.
  • Resonant Cavity Method: Especially suitable for high-precision testing of low-loss materials, across frequency ranges from 1 GHz to 330 GHz.