Microwave Ferrite Technology, Inc.

Microwave Ferrite Technology, Inc. is a leading manufacturer of microwave ferrite materials for the wireless industry in China. We provide a wide range of products, from high-volume garnets for wireless infrastructure to specialized materials for radar applications.

Applications

Our materials are designed for:

• Above-resonance devices (100 MHz to ~3 GHz)
• Below-resonance devices (1 GHz to 40 GHz or higher)
• High-power and phase-shifting applications

Our Ferrites & Magnetic Materials

We offer a diverse range of advanced ferrite and magnetic materials, including:

• Narrow Linewidth Ferrites: Optimized for high-frequency applications with minimal resonance absorption.
• Aluminum & Aluminum-Gadolinium Substituted Garnets: Enhanced thermal stability for specialized microwave systems.
• Gadolinium-Substituted Garnets: Superior magnetic properties for advanced signal processing.
• Cobalt & Holmium-Doped Garnets: Performance-boosting materials for high-power microwave applications.
• Magnesium Spinels: Low-loss materials ideal for reduced magnetic interference in devices.
• Nickel Spinels: High magnetization and excellent thermal stability.
• Lithium Spinels: Ideal for discrete phase shifters with wide saturation magnetization properties.
• Permanent Magnets: Including ferrite and rare-earth magnets for industrial and scientific applications.

Key Characteristics

Our ferrites are engineered for high-frequency performance:

1. High specific electrical resistivity (ρ > 10⁶ Ω·cm), ensuring low dielectric losses (tgδε: 10⁻² to 10⁴).
2. Dielectric permittivity (ε’ ≈ 10–15).
3. Excellent thermal stability across a wide temperature range.
4. High activity with minimal bias for optimal nominal parameters.
5. Saturation magnetization (4πMs: 400–5000 G).
6. Narrow resonance linewidth (2ΔH: 0.3–0.5 Oe for yttrium-iron monocrystals; 3–1000 Oe for polycrystalline ferrites).

Configurations

Our microwave ferrites and ceramics are available in various shapes and compositions, with precision manufacturing to meet custom requirements.

Microwave Ferrite Materials

1. Yttrium Iron Garnets (YIG):
   • Ideal for high-frequency devices in the lower microwave band.
   • Features: Narrow ferromagnetic resonance linewidth, low magnetic losses, high magnetization, and excellent thermal stability.
   • Enhanced with Cobalt or Rare-earth ions (Dy, Gd) for improved power stability.
2. Spinel-Based Materials:
   • Magnesium Spinels: Low coercive field strength, minimal magnetic and dielectric losses, suitable for non-resonance applications.
   • Nickel Spinels: Wide magnetization range, high thermal stability, ideal for resonance applications.
   • Lithium Spinels: Used in discrete phase shifters, offering low coercive field strength and a wide range of saturation magnetization.

Microwave Ferrite Material Specifications

The table below provides detailed specifications for our microwave ferrite materials, categorized by series. All materials are engineered for high-frequency applications with low losses and excellent thermal stability.

Parameter Definitions

• Density (g/cm³): Material density.
• 4πMs (Gauss): Saturation magnetization with ±5% tolerance.
• ε' ±5%: Dielectric permittivity with ±5% tolerance.
• tgδε: Dielectric loss tangent, indicating low dielectric losses.
• ΔH (Oe): Ferromagnetic resonance linewidth, a key indicator of material performance in high-frequency bands.
• ΔHk (Oe): Anisotropy field linewidth, affecting material stability.
• Tc (°C): Curie temperature, indicating the temperature stability range.

Material Series

• Li Ferrite Series: Low magnetic and dielectric losses, high temperature stability, high dielectric coefficient.
• Ni Ferrite Series: Excellent temperature stability, small ferromagnetic resonance linewidth, low dielectric loss.
• Ni Ferrite High-Power Series: Low losses, high surface density, excellent temperature stability.
• General Garnet Series: Low losses, good temperature stability, excellent compatibility.
• Narrow Linewidth Garnet Series: Small resonance linewidth, high stability, excellent surface quality.
• High-Power & Low-Temperature Coefficient Garnet Series: Low losses, high peak power tolerance, temperature stability.
• Microwave High-Q Ferrite Resonator Series: Small resonance linewidth, high-frequency performance, low temperature coefficient (<50 Hz/°C), stable properties.

Advantages

• Quality Assurance: Our expert quality control team ensures each ferrite meets stringent standards.
• Versatility: Available in disc, triangular, or custom formats for isolators and circulators across radio-communication frequencies.
• Miniaturization: Ferrite-dielectric composites enable compact isolator/circulator designs with low deltaH (ΔH) for reduced IMD.

Surface Treatment

Protective coatings include Ni-Cu-Ni, Zn, Au, Ag, Sn, Ti, TiN, Cr, and custom options per customer requirements.

Maintenance Guidelines

To maintain magnetic performance and prevent rusting, avoid exposure to:

• Acid or alkali liquids
• Organic solvents, electrolytes, water, or oil
• Hydrogen, chlorine, ammonia, or oxynitride gases
• Radiation or radioactive rays

Applications by Sector

• Garnet & Spinel Ferrites: Space, Defense, Telecommunications
• Ferrite-Dielectric Assemblies: Telecommunications

For more information, please reach out:

• E-mail: magnet886@gmail.com
• WhatsApp: +8615867408815
• Website: https://www.microwaveferrite.com