Low-loss microwave dielectric ceramic

23232 There is provided a low-loss microwave dielectric ceramic having a composition represented by xCaO.yLnO.zAlO.mTiOwherein Ln is Nd or Sm, 25.0 mole %≦x≦75.0 mole %, 10.0 mole %≦y≦30.0 mole %, 10.0 mole %≦z≦30.0 mole %, 0.8 mole %≦m≦20.0 mole %, x+y+z+m=100 mole %. It has a dielectric constant i...

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Bibliographic Details
Main Authors Chen, Xiangming, Fan, Xiecheng
Format Patent
LanguageEnglish
Published 13.07.2010
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Summary:23232 There is provided a low-loss microwave dielectric ceramic having a composition represented by xCaO.yLnO.zAlO.mTiOwherein Ln is Nd or Sm, 25.0 mole %≦x≦75.0 mole %, 10.0 mole %≦y≦30.0 mole %, 10.0 mole %≦z≦30.0 mole %, 0.8 mole %≦m≦20.0 mole %, x+y+z+m=100 mole %. It has a dielectric constant in the range from 18 to 25, an extremely large Qf value ranging from 80,000 to 200,000 GHz, and a temperature coefficient of resonant frequency tunable in the vicinity of 0. It can make the applications of dielectric resonators, filters, and antennas extended to higher frequency and larger power; it can also be applied to microwave capacitors, temperature-compensated capacitors, microwave substrates, et al.