Journal of the Korea Institute of Information and Communication Engineering (한국정보통신학회논문지)

The Korea Institute of Information and Commucation Engineering (한국정보통신학회)
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Design and Simulation of Tunable Dielectric Multilayer (TDM) Filters for RF and MMIC Applications

MMIC화를 위한 RF용 튜닝가능한 다층 박막 유전체 필터 설계 및 시뮬레이션

  • 윤기완 (한국정보통신대학원대학교) ;
  • 채동규 (한국정보통신대학원대학교) ;
  • 임문혁 (한국정보통신대학원대학교) ;
  • 김동현 (한국정보통신대학원대학교)
  • Published : 2003.08.01
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Abstract

In this paper, four different types of BSTO tunable bandpass filters with ferroelectrics are proposed. The achievement of the tunability is based on the fact that the increase in the bias voltage leads to the reduction of the effective dielectric constant. Therefore, the center frequency shifts to the higher value with the higher bias voltage. The most frequently used and well-known ferroelectrics are STO and BSTO materials where the STO is mainly used below 100K while the BSTO is used at room temperature. The proposed technology seems very useful and promising for the development of the next-generation wireless communications.

본 논문에서는 BSTO 강유전체를 이용한 가변 대역통과필터들을 4가지 유형의 예를 들어 제안한다. 제안 기술에서 인가 전압이 증가할수록 강유전체의 유효 유전율은 비선형적으로 감소하고 따라서 중심 주파수가 높은 쪽으로 이동한다 이 때 사용하는 강유전체로는 STO와 BSTO가 있는데 STO는 100K 이하의 저온에서, BSTO는 실온에서 주로 사용한다. 본 제안 기술은 차세대 무선통신 기술 발전에 매우 유용하게 기여 할 것으로 보인다.

Keywords

References

  1. F. W. Van Keuls, R. R. Romanofsky, 'A Ku-Band Gold/BaxSr1-xTiO3/LaAlO3 conductor/thin film ferroelectric microstrip line phase shifter for room-temperature communications applications', Microwave and opt., vol. 20, no. 1, pp. 53-56, 1999 https://doi.org/10.1002/(SICI)1098-2760(19990105)20:1<53::AID-MOP15>3.0.CO;2-L
  2. A. T. Findikoglu, 'Tunable and adaptive bandpass filter using a nonlinear dielectric thin film of SrTiO3', Appl. Phys. Lett., vol. 68, no. 12, pp. 1651-1653, 1996 https://doi.org/10.1063/1.115894
  3. F. W. Van Keuls, '(YBa2Cu3O7-$\delta$,Au)/SrTiO3/LaAlO3 thin film conductor/ferroelectric coupled microstrip line phase shifters for phased array applications', Appl. Phys. Lett, vol. 71, no. 21, pp. 3075-3077,1997 https://doi.org/10.1063/1.120251
  4. L. H. Hsieh and K. Chang, 'Slow-wave bandpass filters using ring or stepped-impedance hairpin resonators', IEEE Trans. Microwave Theory Tech., vol. 50, no. 7, pp. 1795 -1800, July 2002 https://doi.org/10.1109/TMTT.2002.800439
  5. Y. Yamamoto, Y. Imon, S. Mikumo, and M. Katsuragi, 'Tuning a bandpass filter by optical control of a negative-resistance circuit', IEEE Trans. Microwave Theory Tech., vol. 46, no. 12, pp. 2006-2010, Dec. 1998 https://doi.org/10.1109/22.739273
  6. C. K. Ong, L. Chen, J. Lu, C. Y. Tan, and B. T. G. Tan, 'High-Temperature Superconducting Bandpass Spiral Filter', IEEE Micro. and Guided Wave Lett., vol. 9, no. 10, Oct. 1999