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Microwave Properties of Co2 Ferrite for Miniaturization of Antenna

안테나 소형화를 위한 Co2 페라이트의 마이크로파 특성

  • 김재식 (광운대 전자재료공학과) ;
  • 최의선 (광운대 전자재료공학과) ;
  • 김강 (한국폴리텍III대학 춘천캠퍼스 전자과) ;
  • 이영희 (광운대 전자재료공학과) ;
  • 송성호 (한국폴리텍IV대학 청주캠퍼스 전기에너지과) ;
  • 안종복 (한국폴리텍IV대학 청주캠퍼스 전자과) ;
  • 김병환 (한국폴리텍II대학 인천캠퍼스 컴퓨터정보과) ;
  • 최지영 (한국폴리텍I대학 서울정수캠퍼스 유비쿼터스 통신과)
  • Received : 2011.07.20
  • Accepted : 2011.11.09
  • Published : 2011.12.01

Abstract

The sintering behavior and microwave properties of ferrite ($Ba_3Co_{2-2x}Zn_{2x}Fe_{24}O_{41}$ ceramics) were investigated for microwave applications. Also PIFA type antenna with ferrite was simulated. All samples were prepared by the solid state reaction method and sintered at $1350^{\circ}C$. All ceramics had relatively density above of 92% compare with theoretical density of $Ba_3Co_2Fe_{24}O_{41}$ ceramics. From the XRD pattens, the Z-type phase was existed as main phase in $Ba_3Co_{2-2x}Zn_{2x}Fe_{24}O_{41}$ ceramics. The permittivity and permeability of $Ba_3Co_{2-2x}Zn_{2x}Fe_{24}O_{41}$ ceramics were increased with Zn additions and decreased rapidly over frequency of 200~600 MHz. Several PIFA type antennas with ferrite and FR4 were simulated. All antenna structure had return loss of less than -10 dB at each resonant frequency. Simulated antenna using both ferrite and FR4 showed size reduction of 25% without a significant decrement of efficiency.

Keywords

References

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