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Electrically small ferrite antenna gain with dc magnetic field for mobile device application
Author(s) -
Lee Jaejin,
Hong YangKi,
Lee Woncheol,
Park Jihoon,
Tanaka Terumitsu,
Yun Changhan
Publication year - 2014
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.28377
Subject(s) - ferrite (magnet) , materials science , electrical engineering , omnidirectional antenna , microwave , antenna gain , coaxial antenna , magnetic field , antenna (radio) , optoelectronics , optics , physics , engineering , telecommunications , quantum mechanics
We demonstrate that electrically small ferrite antenna gain is significantly increased with a small dc magnetic field of compact Nd‐Fe‐B permanent magnet (9.5 × 4.6 × 1.5 mm 3 ). The experimental magnetic tangent loss of the Ni‐Mn‐Co ferrite decreased by about 62%, which was from 0.509 with 0 Gauss to 0.192 with 750 Gauss. The antenna gain increased by 54% (from −10.58 to −4.81 dBi) when the magnetic field of 1600 Gauss was applied to the antenna. The ferrite antenna has the volume of 0.346 cm 3 and shows omnidirectional patterns, which are suitable for hand‐held mobile device applications. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1531–1534, 2014