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J. Electromagn. Eng. Sci > Volume 10(4); 2010 > Article
Journal of the Korean Institute of Electromagnetic and Science 2010;10(4):296-302.
DOI: https://doi.org/10.5515/JKIEES.2010.10.4.296   
Approximation Equation for Broad Bandwidth Antenna Design Using CMMS
Kyeong-Sik Min, Ji-Chul Lee
Department of Radio Communication Engineering, Korea Maritime University
This paper proposes an approximate equation for broad bandwidth conditions in an antenna feeding probe design with a cylindrical magneto material structure (CMMS). The bandwidth calculation has been conducted according to the relation between the distance ($r_m$) between the magneto material and feeding probe, and the magneto material thickness ($t_m$) for a given ${mu}_r$. The bandwidth of a proposed antenna with CMM feeding structure is improved about 182 %, when ${mu}_r=20+j0.001$, in comparison with the bandwidth of an antenna without CMMS. The maximum error extent between the bandwidth calculated by the approximation equation and by the numerical calculation of the proposed antenna is about $pm$3.2 % for ${mu}_r=10+j0.001$. The approximation equation proposed in this study can solve the conventional problem of the complex process and the long time required for reiterative calculation, and allow simple and precise design with prediction. The accuracy of an approximated equation is compared with the results calculated by a commercial tool and verified by reasonable agreement between them.
Key words: CMM, Dipole Antenna Feeding Probe, Broad Bandwidth Condition, Approximation Equation, Calculation Time Improvement
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