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Input Impedance Matching Method of Inverted L Antenna using thin Ferrite Film

페라이트 薄膜을 이용한 逆L形 안테나의 入力임피던스 整合法

  • Lim, Gye-Jae (Dept. of Electronic Information & Communication Engineering in Kwandong Univ.) ;
  • Jung, Soo-Jin (Dept. of Electronic Information & Communication Engineering in Kwandong Univ.) ;
  • Choi, Jong-Kwon (Dept. of Electronic Information & Communication Engineering in Kwandong Univ.)
  • 임규재 (關東大學校 電子情報通信工學部) ;
  • 정수진 (關東大學校 電子情報通信工學部) ;
  • 최종권 (關東大學校 電子情報通信工學部)
  • Published : 2004.12.01
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Abstract

Input impedance of the inverted L antenna which is modified from a monopole antenna varies to very high input impedance value when the ratio of vertical height to horizontal length is reduced. So its impedance matching becomes very difficult. In this paper, we analyzed the input impedance variation range depending on the ratio of vertical height to horizontal length in the normal and ferrite thin film added configuration for the input impedance control. For the exact analysis involving the permittivity, permeability and conductivity of ferrite material, FDTD numerical method is used.

모노폴 안테나를 직각으로 꺾어 변형시킨 역 L형 안테나는 수직부와 수평부의 길이 비에 따라 입력임피던스의 변화가 크기 때문에 정합 문제가 발생하게 된다. 본 논문에서는 수직부와 수평부의 길이 비에 따라 임피던스의 변화를 해석하고, 급전부 인접 접지면상에 부분적으로 페라이트 박막을 부가하여 임피던스의 조절이 가능함을 확인할 수 있었다. 페라이트의 재질특성(유전율, 투자율, 도전율)이 주어졌을 때, 호형 페라이트 필름구조(두께, 반경 등)의 변화에 따른 임피던스 변화를 역 L 안테나 모형에 적용함으로써 휴대폰 내장형 안테나 설계시 최적 정합이 이루어질 수 있도록 FDTD 수치해석 방법을 사용하였다.

Keywords

References

  1. Tarvas, S., and Isohatala, A., 2000: An internal dual-band mobile phone antenna, IEEE Antennas Propagat Soc Int Symp Dig, Salt Lake City, UT, pp. 266-269
  2. Liu, Z. D., Hall, P. S., and Wake, D., 1997: Dual-frequency planar inverted F antenna, IEEE Trans antennas Propagat 45, pp. 1451-1458 https://doi.org/10.1109/8.633849
  3. Rowell, C. R., and Murch, R. D., 1997: A capacitively loaded PIFA for compact mobile telephone handsets, IEEE Trans Antennas Propagat 45, pp. 837-842 https://doi.org/10.1109/8.575634
  4. Dou, W. P., and Chia, Y. W., M., 2000: Novel meandered planar inverted-F antenna for triple-frequency operation, Microwave Opt Technol. Lett 27, pp. 58-60 https://doi.org/10.1002/1098-2760(20001005)27:1<58::AID-MOP16>3.0.CO;2-W
  5. Salonen, P., Keskilarruni, M., and Kivikoski, M., 2001: New slot configurations for dual-band planar inverted-F antenna, Microwave Opt Technol Lett 28, pp. 293-298 https://doi.org/10.1002/1098-2760(20010305)28:5<293::AID-MOP1022>3.0.CO;2-T
  6. Zhi Ning Chen, 2000: Note on impedance characteristics of L-shaped wire monopole antenna, Microwave and Optical Technology Letters, 26(1), pp. 22-23 https://doi.org/10.1002/(SICI)1098-2760(20000705)26:1<22::AID-MOP7>3.0.CO;2-M
  7. Kunz, K. S., and Luebbers, R. J., 1993: The Finite Difference TIme Domain method for Electromagnetics, CRC Press, pp.11-49
  8. Melvin M. Weiner. 2003: Monopole Antennas, Marcel Dekker Inc. New York, pp. 21-24
  9. Jianqing wang, and Osamu fujiwara. 1999: Effects ofFerrite Sheet Attachment to Portable Telephone in Reduction Electromagnetic Absorption in Human Head, IEEE ISEC, 2, pp. 822-825
  10. Yee, K. S. 1966: Numerical solution ofinitial boundary value problems involving Maxwell's equations in isotropic media, IEEE Trans. on AP, 14, pp. 302-307 https://doi.org/10.1109/TCOM.1966.1089323