Microwave Ferrites

Microwave Ferrites, Microwave Ferrite and Ceramic, Garnet & Ferrite (Microwave), Narrow Linewidth Ferrite Material, Microwave Ferrite Based Components, Nickel Spinels  Microwave Ferrite, Lithium Spinels Microwave Ferrite

Introduction

Microwave ferrite magnets can generate constant magnetic field to control electric current so that microwave signal is amplified and information can be smoothly transmitted. Microwave magnets are widely used in magnetrons, cathode-ray tubes, isolators, circulator, etc. These electronic components are commonly applied in radars, satellite communications, remote control systems, electronic tracking, electronic countermeasures, etc.

microwave ferrite and ceramic

Characteristics

In recent years due to success in the field of microwave electronics a lot of devices of different applications were produced. The prospects for future development of microwave systems with predetermined characteristics are mainly assigned by ferrite choise. However the choise of a material for a concrete application in microwave technique is a complicated task, as there are different requirements to different parts of microwave band. Among main characteristics of ferrites suitable for high frequencies are:

• At the expense of high specific electrical resistivity (ρ >10⁶ Ом·sm) ferrites are characterised by low dielectric losses at high frequencies tgδ=10^-2÷10^-4).
• Dielectric permittivity ε^‘ (about 10-15)
• Thermal stability in a wide temperature range
• The high activity is being determined by the value of minimal bias which is essential for required nominal parameters providing.
• Saturation magnetization, M _s; 4πM_s (400-5000 G)
• The width of resonance curve 2ΔH is one of the main parameters characterising properties of ferrites applied in high-frequency band. The yttrium-iron monocrystals exhibit the minimal value 2ΔH =0.3-0.5 Oe. The width of resonanse curve of polycrystalline ferrites varies from 30…40 to 800-1000 Oe.

Configurations

Microwave ferrites and ceramics are being produced on the base of pressed powder sintered at high temperatures. After thermal sintering the items can be smoothed and/or polished. Company produces items with different forms. Dimensional allowance at mechanical treatment is ±0,025 mm. In spite of standard variants of performance it is possible to produce cores in accoradance with sizes and customers drawings.

microwave ferrite shapes

Microwave  Ferrite Materials

Materials on the base of yttrium iron garnets
HSMAG manufactures ferrites or ceramics on the base of compounds with garnet and spinel structures. Yttrium-iron garnets are applied for production of different high-frequency devices operating in low border of high-frequency band. The great interest to ferrites with garnet structure, particularly, to yttrium garnet is explained by narrow line of ferromagnetic resonance absorption. Such materials are also characterised by small magnetic losses; relatively high magnetization; high thermalstability.Often ions of Cobalt and Rare-earth ions (Dy), (Gd) are introduced to materilas structure in order to improve material characteristics for increasing of ferrite stability to Power.

Materials on the base od compunds with spinel structure
Ferrite materials on the base of Mg spinel are characterised by small values of coercive field strength and also by low magnetic and dielectric losses that allows to use them in fields far from resonance area. cocernintg devices operating nerby resonance area the great is interest is attracted to materials on the base of Ni spinel. Such ferrites are characterised by a wide range of magnetization and high thermal stability. Ferrites on the base of Li spinel can be used in discrete phase shifters. Small values of coercive field strength and thermal stability in operating temperature range and a wide range of saturation magnetization values are characteristic for such materials.

Advantages

We have our own quality control department which is constituted by an expert teams. Each microwave ferrite magnets must be exactly tested before sales to guarantee that they are of high quality and meet specific requirement of customers.

Designed for isolator and circulator sub-systems used in a wide range of frequencies in radio-communication systems, Ferrite materials are available in disc or triangular formats or as custom designs. The materials are based on HSMAG formulations, offering low deltaH (ΔH) values that are effective in reducing IMD.

By associating the ferrites with a dielectric material, it is possible to develop a wide choice of composites (FDA approved) for miniaturizing isolator/circulator designs.

Surface Treatment

In surface treatment, various protective claddings are applied on the surface of microwave magnets, includeing Ni-Cu-Ni, Zn, Au, Ag, Sn, Ti, TiN, Cr, etc. Besides, we can customize specific surface treatment for microwave ferromagnets according to requirements of customers.

Maintenance

DO NOT place microwave ferrite magnets in following environments to prevent them from rusting or reducing magnetic performance.

Garnet & Spinel ferrites: Space/Defense/Telecommunications

Ferrite-Dielectric assembly: Telecommunications

1. Acid or Alkali Liquor
2. Organic Solvent
3. Electrolyte
4. Water or Oil
5. Hydrogen
6. Active Gas like Chlorine, Ammonia, Oxynitride
7. Radiation or Radioactive Rays

Microwave Ferrite Material Series

Li ferrite material series:
Low magnetic loss and dielectric loss, Good stability of temperature, High dielectric coefficient

Ni ferrite material series:
Well temperature stability, Small ferromagnetic resonance line width, High spin wave width line, Low dielectric loss

Ni ferrite high power material series:
Low magnetic and dielectric loss, well temperature stability, excellent surface density and compactness

General garnet material series:
Low magnetic loss and dielectric loss, Good stability of temperature, Excellent surface density and well compatibility

Narrow line width garnet material series:
Small ferromagnetic resonance line width, Good stability of temperature, Excellent surface density and well compatibility

High power and low temperature coefficient garnet material:
Low magnetic loss and dielectric loss, Good stability in temperature, Bear the high peak power

Microwave high-Q ferrite resonator series:
Small ferromagnetic resonance width line, High working frequency band and well temperature stability (lower than 50Hz/°C), Stable properties parameter and length, No magnetic static wave oscillation in the working frequency band

Microwave  Ferrites & Magnetic Materials include:
Narrow Linewidth
Aluminum & Aluminum Gadolinium Substituted Garnets
Gadolinum Substituted Garnets
Cobalt & Holmium Doped Garnets
Magnesium Spinels
Nickel Spinels
Lithium Spinels
Absorbers & Inductors
Basic Dielectrics
Magnesium Aluminum Titanate
Magnesium Calcium Titanate
Substrates
Phase Shifters