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An application of a reflector for increase of the radiation efficiency of cellular telephone antennas
Author(s) -
Hankui Eiji,
Hashimoto Osamu,
Nishizawa Shinichiro
Publication year - 2000
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/1099-047x(200007)10:4<253::aid-mmce6>3.0.co;2-a
Subject(s) - reflector (photography) , finite difference time domain method , parabolic antenna , optics , periscope antenna , dielectric , microwave , antenna (radio) , radiation , materials science , electrical conductor , antenna efficiency , radiation pattern , dipole antenna , electrical engineering , optoelectronics , physics , engineering , telecommunications , light source
A reflector placed near a cellular telephone antenna is proposed to increase its radiation efficiency. In this study, a half wavelength dipole antenna at 900 MHz is treated as a cellular telephone model and a small plate reflector is placed between the antenna and a human head‐sized phantom model. By using the finite‐difference time‐domain (FDTD) method, various kinds of materials, such as a dielectric material, a magnetic material, and a conductive material, are investigated for the reflector composition. Among them, a magnetic reflector having high μ r ′and low μ r ″(complex relative permeability: μ r ′ − j μ r ″ ) is shown to be effective for increasing the radiation efficiency. © 2000 John Wiley & Sons, Inc. Int J RF and Microwave CAE 10: 253–263, 2000.