Journal of Systems Engineering and Electronics ›› 2009, Vol. 20 ›› Issue (4): 711-717.

• ELECTRONICS TECHNOLOGY • Previous Articles     Next Articles

Research on frequency-temperature compensated sapphire-SrTiO3 loaded cavity for hydrogen maser

Wang Nuanrang1,2, Zhou Tiezhong2, Gao Lianshan1,2, Yang Chuntao1,2 & Feng Keming1,2   

  1. 1. National Key Lab. of Metrology and Calibration Technology, Beijing 100854, P. R. China;
    2. Beijing Inst. of Radio Metrology & Measurement, Beijing 100854, P. R. China
  • Online:2009-08-14 Published:2010-01-03


To obtain frequency-temperature compensation in a sapphire loaded cavity for hydrogen maser, a dielectric named SrTiO3 is employed whose temperature coefficient of permittivity is opposite to that of sapphire. Based on theoretical analysis and computer simulation, a TE011 mode of a sapphire loaded cavity associated with two small rings of SrTiO3 with different thickness is solved, and the useful parameters that influence the temperature coefficient of cavity are calculated. Finally an experiment is brought forward and its results are very close to the computing results. When the thickness of SiTiO3 dielectric is 7 mm and the diameter is 17 mm in configuration b, the temperature coefficient of cavity is decreased from −58.8 kHz/K to −8.2 kHz/K and the quality factor is 40248.