• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.21 no.9
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• pp.1030-1036
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• 2010

This paper proposes a simulation design for feeding probe with the CMM(Cylindrical Magneto Material) structure for broad bandwidth of a dipole type antenna. In order to ensure low frequency bandwidth, the magnetic material with high relative permeability was considered in design calculation. It was confirmed that the broad bandwidth was independent on the relative permeability value and depended on the control of distance($r_m$) between magnetic material and feeding probe, and of magnetic material thickness($t_m$). Furthermore, an antenna size with the CMM was miniaturized about 18 % comparison with its size without the CMM.

• Journal of Navigation and Port Research
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• v.34 no.1
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• pp.21-26
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• 2010

This paper describes patch antenna design method of antenna high gain and broad bandwidth using cylindrical magneto material around feeding line. Strong current induction method applied combination to generate magnetic fields around feeding line for antenna high gain characteristic and principle of PIFA designed application for design of antenna broadband. In case of single CMM, gain increased 3.96 dB compare with the reference antenna gain however bandwidth characteristic not increased compare with the reference antenna. In case of dual CMM, gain improved about 10 dB compare with the reference antenna and -10 below bandwidth is 700 MHz(50 MHz~750 MHz) with this paper designed high gain characteristic.

• Journal of electromagnetic engineering and science
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• v.10 no.4
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• pp.296-302
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• 2010

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.