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Extension and validation of equivalent source helical antenna modeling with the FDTD code
Author(s) -
Lazzi Gianluca,
Yu QiShan,
Gandhi Om P.
Publication year - 1999
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/(sici)1098-2760(19991105)23:3<172::aid-mop12>3.0.co;2-t
Subject(s) - finite difference time domain method , grid , lossy compression , helical antenna , antenna (radio) , microwave , electronic engineering , acoustics , computer science , geometry , electrical engineering , physics , engineering , mathematics , optics , radiation pattern , telecommunications , coaxial antenna , artificial intelligence
Since small‐diameter, normal‐mode helical antennas are often used for cellular telephones, accurate modeling of these antennas using the FDTD grid is a must if this preferred method, allowing anatomically based heterogeneous simulation of the body, is to be used for calculating the performance of personal wireless devices. An easy‐to‐use rectangular FDTD grid is, however, subject to staircasing for the helical geometry. An approach using equivalent electric and magnetic sources has previously been presented by the authors, although not thoroughly tested for cases where the diameter of the helix may be more than two times the FDTD grid size. In this letter, we present a modified weighted equivalent source method and its experimental validation for such larger diameter helical antennas. The grid is selected to conform to the overall dimensions of the helix. The calculated field variations for a lossy sphere representative of the human head agree well with the measured data. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 23: 172–174, 1999.