Substrates Used in RF Applications

university wafer substrates

Float Zone Silicon Wafers For RF Applications

A postdoc requested the following quote.

I'm looking for a small quantity of highly- resistive (10k to 20k Ω-cm if available) 100mm silicon wafers for an RF application, wafer-thickness isn't too important but 300 µm - 350 µm would be preferable. If you have anything like this in stock I'd be interested to hear about it. 

UniversityWafer, Inc. Quoted:

100mm Intrinsic Si:- [100] 350 micron DSP FZ >10,000 ohm-cm

Reference #113761 for specs and pricing.

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Fused Silica Wafers For RF Applications?

An Assistant Professor, Ph.D. requested the following quote.

I am using a JGS2 Fused Silica (0.5 mm thick, 22mm flat, DSP) from your company.

I recently want to use the substrate for RF application.

Do you have material property data including permittivity and permeability?

Reference #245244 for specs and pricing.

What Is the Material Property Data Including Permittivity and Permeability of JGS2 Fused Silica Wafers?

Fused silica, particularly JGS2 grade, is known for its high purity and excellent optical properties. Here are some material property data for JGS2 fused silica wafers:

Material Properties of JGS2 Fused Silica

  1. Permittivity (Dielectric Constant)

    • Relative Permittivity (εr) at 1 MHz: approximately 3.75

  2. Permeability

    • Relative Permeability (μr): approximately 1 (as fused silica is a non-magnetic material)

  3. Other Key Properties

    • Density: 2.20 g/cm³
    • Refractive Index:
      • At 588 nm (yellow light): 1.458
    • Thermal Expansion Coefficient:
      • From 20°C to 320°C: 0.55 x 10⁻⁶ /°C
    • Thermal Conductivity:
      • At 20°C: 1.38 W/(m·K)
    • Young's Modulus: 73 GPa
    • Poisson's Ratio: 0.17
    • Tensile Strength: 48 MPa
    • Compressive Strength: 1.1 GPa
    • Hardness (Knoop): 530 kg/mm²

Optical Properties

  • Transmission Range:
    • UV Grade: 185 nm to 2,500 nm
  • Absorption Coefficient:
    • At 193 nm: < 0.001 cm⁻¹
  • Birefringence:
    • Low birefringence, typically less than 5 nm/cm

These properties make JGS2 fused silica wafers suitable for a wide range of applications, particularly in optics, telecommunications, and high-precision instruments. If you need more specific details or data at different frequencies/conditions, please let me know!

Five Common RF Applications

Sure, here are five applications of Radio Frequency (RF) technology:

  1. Wireless Communication:

    • RF technology is widely used in mobile phones, Wi-Fi, Bluetooth, and RF Wireless Communication Applicationsatellite communications, enabling wireless data transmission over various distances.

  2. Broadcasting:

    • RF is essential in radio and television broadcasting, where it is used to transmit audio and video signals over the airwaves to receivers in homes, cars, and portable devices.

  3. Radar Systems:

    • RF technology is a critical component of radar systems used in aviation, maritime navigation, weather monitoring, and military applications for detecting and tracking objects.

  4. Medical Applications:

    • RF energy is utilized in medical devices for treatments such as RF ablation for cancer and heart arrhythmias, as well as in MRI machines for imaging internal structures of the body.

  5. Industrial and Scientific Applications:

    • RF is used in industrial heating processes, such as microwave ovens and RF dryers, and in scientific research, including particle accelerators and spectroscopy instruments.

These applications demonstrate the versatility and widespread use of RF technology in various fields.