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Planar inverted‐F antennas loaded with very high permittivity ceramics
Author(s) -
Hwang Y.,
Zhang Y. P.,
Lo T. K.
Publication year - 2004
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/2003rs002939
Subject(s) - materials science , antenna (radio) , planar , radiation pattern , antenna measurement , permittivity , antenna gain , antenna factor , antenna efficiency , coaxial antenna , optics , relative permittivity , miniaturization , ceramic , acoustics , dielectric , optoelectronics , computer science , telecommunications , physics , composite material , nanotechnology , computer graphics (images)
With reference to a conventional air planar inverted‐F antenna this paper describes the miniaturization of the planar inverted‐F antenna by dielectric loading of barium tetratitanate ceramics of very high permittivity (εr = 38, 80) at 1.8 GHz. It is found that a simple loading method can reduce the antenna size but at the cost of the antenna performance. For instance, the antenna gain becomes lower. Then a sophisticated loading approach based on a novel substrate‐superstrate structure is developed to improve the antenna gain. The whole process of the gain enhancement is analyzed by using the finite difference time domain method. The simulations are excellently correlated with the experiments. They both show that the sophisticated loading technique can reduce the antenna size by four times and still maintains the comparable performance.