Proceedings of the KIEE Conference (대한전기학회:학술대회논문집)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

A study on the HF monolithic ceramic filter using thickness mode

두께진동모드를 이용한 고주파대역의 단일체 세라믹필터에 대한 연구

  • Park, Chang-Yub (Dept. of Electrical Engineering, Yonsei Univ.) ;
  • Wi, Gyu-Jin (Dept. of Electrical Engineering, Yonsei Univ.) ;
  • Lee, Doo-Hee (Dept. of Electrical Engineering, Yonsei Univ.)
  • 박창엽 (연세대학고 전기공학과) ;
  • 위규진 (연세대학고 전기공학과) ;
  • 이두희 (연세대학고 전기공학과)
  • Published : 1987.11.20
Download PDF
⟨ Previous Next ⟩

Abstract

Using the energy trapping theory and the acoustic coupling theory. the Bandpass filter(center frequency = 10.7 MHz) of the fundamental thickness mode was made from the composition of $Pb_{0.96}Sr_{0.04}(Zr_{0.53}Ti_{0.47})O_3$+ 1wt% $Fe_2O_3$. Also, in the double mode monolithic filter, It was observed that as decreasing the size of the electrodes, or shortening the gap between two electrodes, the percent frequency separation was increased. Based on these. a 10.7 MHz uniwafer filter was made having the characteristics that bandwidth was 700 KHz and the percent frequency separation was 6 [dB] and selectivity was 29 [dB], end spurious response was 24 [dB] and insertion loss was 7 [dB].

Keywords