Miniaturized Broadband Ferrite T-DMB Antenna for Mobile-Phone Applications

Author

Bae, Seok ; Hong, Yang-Ki ; Lee, Jae-Jin ; Seong, Won-Mo ; Kum, Jun-Sig ; Ahn, Won-Ki ; Park, Sang-Hoon ; Abo, Gavin S. ; Jalli, Jeevan ; Park, Ji-Hoon

Author_Institution

Dept. of Electr. & Comput. Eng., Univ. of Alabama, Tuscaloosa, AL, USA

Volume

46

Issue

6

fYear

2010

fDate

6/1/2010 12:00:00 AM

Firstpage

2361

Lastpage

2364

Abstract

Miniaturized 0.026 Â¿ Co₂Z hexaferrite and Ni-Mn-Co spinel ferrite T-DMB antennas were fabricated and characterized for antenna performance. The Co₂Z hexaferrites were prepared with two different processes that are water quenching and air cooling. The water quenched Co₂Z hexaferrite antenna shows -6.5 dB of 3-D average gain at 190 MHz and 37 MHz of bandwidth at -10 dB. A magnetic tangent loss of water-quenched Co₂Z hexaferrite was lower than that of air-cooled Co₂Z hexaferrite. Compared to the hexaferrite antennas, the Ni-Mn-Co ferrite antenna shows higher frequency performance. Its gain and bandwidth were measured to be -5.83 dB at 215 MHz and 41 MHz, respectively. Omnidirectional gain pattern was observed from all fabricated ferrite antennas.

Keywords

broadband antennas; cobalt alloys; digital video broadcasting; ferrites; manganese alloys; mobile antennas; mobile handsets; nickel alloys; air cooling; frequency 190 MHz; frequency 215 MHz; frequency 37 MHz; frequency 41 MHz; gain -5.83 dB; hexaferrite antennas; miniaturized broadband ferrite T-DMB antenna; mobile-phone applications; omnidirectional gain pattern; water quenching; Antenna measurements; Application software; Bandwidth; Broadband antennas; Dielectrics; Ferrites; Frequency; Iron; Magnetic losses; Mobile antennas; Antennas; Co$_{2}$Z; Ni-Mn-Co ferrite; T-DMB; hexaferrite;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2010.2044376

Filename

5467384