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ENERGY EFFICIENT CERAMICS FOR RF & MICROWAVE APPLICATIONS

Barry-Industries-Custom-Ceramics-Component-MaterionCeramics2018For decades, Materion has produced and supplied top beryllium oxide ceramics (BeO) for high power level radio frequency (RF) and microwave applications. BeO ceramics have a proven record of dissipating a huge amount of heat. Beryllium oxide ceramics when compared to aluminum nitride (AlN) offers superior thermal conductivity (TC) of up to 325 W/m•K. This makes BeO ceramics an excellent material to make substrates for high power RF and microwave components.

The other properties of this material are what really make it stand out. BeO ceramics offer a coefficient of thermal expansion (CTE) at 9.0 ppm/ºC, which is close to that of gallium arsenide (6.9). BeO ceramics have CTE that matches well to other metal matrix composites (MMCs) such as Cu/W, Cu/Mo, Al/SiC, and E-materials. In addition to these characteristics, BeO also is inherently stable in oxidizing environments, in contrast to nitrides such as AlN that decompose over time to their oxide equivalent.

In higher-frequency applications like RF packaging and microwave components, greater current is required near bond interfaces, which necessitates less-resistive interface layers. With a low dielectric constant of 6.7 and dissipation factor at room temp is 0.0004 max at 1MHz - BeO is well suited for use at high frequencies. BeO offers the ability to reduce the area and size of a device while dissipating the same power and reducing capacitance. This is important when designing high power resistors, RF packaging and microwave circuits.

CASE STUDY: HIGH THERMAL CONDUCTIVITY CERAMICS FOR RF & MICROWAVE RESISTORS

Yulongtong Electron Co. was looking for a reliable partner to meet their expanding demand for resistors in radio frequency and microwave applications. Materion exceeded their expectations by supplying them with beryllium oxide ceramics that provide higher thermal conductivity than AlN.

Read more about our reliable BeO for high power resistors in RF and microwave applications.

THE DESIGN PROPERTIES OF BEO CERAMICS 

BeO ceramics can be made into RF packaging, RF circuits, microwave components, bandpass filters and DC circuits with these ideal properties:

  • BW3250® grade BeO has a minimum TC of 325 W/m•K
  • Highest thermal conductivity of electronically insulating material, second only to diamond
  • Uniform crystalline structure and consistent heat dissipation
  • Dissipation factor at room temp is 0.0004 max at 1MHz and 0.004 max at 1GHz
  • Stable up to 1100°C in moisture-rich and oxygen-containing environments
  • Low dielectric constant of 6.7
  • CTE at 9.0 ppm/ºC

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