CVD Diamond as dielectric material

High-purity MPCVD (Microwave Plasma Chemical Vapor Deposition) diamond is one of the best dielectric materials for high-frequency and high-power electronic applications due to its ultra-low impurity content, low dielectric loss, and excellent thermal conductivity.

Dielectric Constant (Relative Permittivity, εr)

Characteristics:

• Extremely frequency-stable

• Very low temperature coefficient

• Excellent dimensional and dielectric stability

Dielectric Loss Tangent (tan δ)

MPCVD diamond exhibits extremely low dielectric loss, making it ideal for:

• High-power microwave windows

• Radar systems

• Satellite communications

• 5G / 6G millimeter-wave devices

• Vacuum electronic devices

Why MPCVD Diamond is Exceptional for RF & Microwave

Key Advantages

• Ultra-low dielectric loss

• High breakdown field (>10 MV/cm)

• Highest thermal conductivity of any dielectric material

• Low thermal expansion

• Excellent plasma resistance

• High transparency from RF to infrared

Typical Applications

• Microwave windows

• Gyrotron output windows

• Traveling wave tubes (TWT)

• Millimeter-wave radomes

• High-frequency substrates

• Quantum and photonic devices

• Satellite communication systems

DIASEMI Diamond Film

Electronic-grade MPCVD diamond combines:

• Dielectric constant: ~5.4-5.8

• Loss tangent: 10−510^{-5}10−5 level

• Thermal conductivity: up to 2200 W/m·K

• Purity: >99.99% sp³ carbon

making it an ideal material platform for next-generation:

• high-power RF,

• millimeter-wave,

• terahertz,

• radar,

• telecommunication,

• and advanced photonic systems.

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