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Numerical analysis of sleeve monopole in parallel‐plate waveguide
Author(s) -
Chen Zhi Ning,
Hirasawa Kazuhiro,
Wu Ke
Publication year - 2001
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/mmce.1004
Subject(s) - magnetic monopole , electrical impedance , monopole antenna , acoustics , coaxial , fourier series , boundary value problem , modal analysis , microwave , physics , engineering , electrical engineering , mathematical analysis , antenna (radio) , mathematics , vibration , quantum mechanics
A monopole with double sleeves, which consists of a resonant loading and a conventional sleeve monopole, is experimentally investigated. The loaded monopole is put vertically in a parallel‐plate waveguide and driven by a coaxial feeder. The new structure exhibits a remarkably broad impedance bandwidth. In this paper, a modal expansion technique is used to numerically evaluate the impedance characteristics of the monopole by modeling the fields between the plates using cylindrical harmonic functions. A Fourier least‐square integration is applied to finding the expansion coefficients by the boundary and continuity conditions. Prior to modeling the proposed sleeve monopole, the developed analysis scheme is examined for its convergence and accuracy. Calculated results are validated by the measurements. For the optimum design at 5.8 Ghz, we investigate the effects of the structure parameters on the impedance characteristics. © 2001 John Wiley & Sons, Inc. Int J RF and Microwave CAE 11: 86–98, 2001.