| Title |
Microwave Properties of Co2 Ferrite for Miniaturization of Antenna |
| Authors |
김재식(Kim, Jae-Sik) ; 최의선(Choi, Eui-Sun) ; 김강(Kim, Kang) ; 이영희(Lee, Young-Hie) ; 송성호(Song, Sung-Ho) ; 안종복(Ahn, Jong-Bok) ; 김병환(Kim, Byung-Hwan) ; 최지영(Choi, Ji-Young) |
| DOI |
https://doi.org/10.5370/KIEE.2011.60.12.2270 |
| Keywords |
Ferrite ; Permittivity ; Permeability ; Miniaturization of antenna |
| 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°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. |