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RISS 인기검색어
- 검색키워드
- 저자 : 김명중 ( Myong Jung Kim ) (검색결과 5 건)
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김명중 忠州大學校 1985 한국교통대학교 논문집 Vol.18 No.2
This paper described the effective hight change depending on the variable upward angle for typical λ/4 vertical receiving antenna. Where the effective hight is sinusoidal current dictribution theough the solution of opproximate linear wave equation with considered some parameters. As a results, the effective hight is zoro at 0˚ and 90˚ and it is occured the highest effective hight from 25˚ to 30˚
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Pocklington 적분방정식에 의한 선형안테나의 전류분포에 관한 고찰
金明中 忠州大學校 1987 한국교통대학교 논문집 Vol.20 No.2
For the analysis of an antenna we should figure out the exact current distribution on the antenna. It has been said that there are two types of intergral equation for this, Hallen and Pocklington. Although it has an exactitude, the Hallen is difficult to apply to the complicated antenna for it is more complex than the pocklington. Accodingly I examined the intergral equation of Pocklington and applied it to dipole antenna and helical antenna. The result showed that it accords with the result of hallen within 1%.
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金明中 충주대학교 1993 한국교통대학교 논문집 Vol.27 No.-
A coil loaded antenna is a typical example of loaded antenna and has been analyzed by Harrison et al. They found a solution through treating the coil as an concentrated constant. It is required, how ever, that the coil should also be treated with distributed constant as in antenna because the current of coil flows to spiral and the phase velocity of axis direction is later than that of antenna. Accordingly I studied of a way which can be a solution by treating coil as a distributed constant and derived Pocklington form integral equation by use electromagnetic field to be generated from coil. As a result I could work out computing value nearer to experimental value in comparision with the traditional method treating the coil as a concentrated constant. And it is thought that the result can be useful for solution and design the loaded wire antenna.
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김명중 충주대학교 1990 한국교통대학교 논문집 Vol.24 No.-
A coil loaded antenna is a typical example of loaded and has been analyzed by Harrison et al. They foud a solution through treating the coil as an concentrated constant. It is required, how ever, that the coil should also be treated with distributed constand as in antenna because the current of coil flows to spiral and the phase velocity of axis direction is later than that of antenna. Accordingly I studied of a way which can be a solution by treating coil as a distributed constant. As a result I could work out computing value nearer to experimental value in comparision with the traditional method treating the coil as a concentrated constant. And it is thought that the result can be useful for solution and computing the loaded antenna.
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金明中 忠州大學校 1986 한국교통대학교 논문집 Vol.19 No.2
This paper examined on the typical earthed monopale antenna by moment method, and then studied on the input impedance, directional efficiency, and current distribution by parameters of permittivity and conductivity of earth and frequencies. The results are that the lower is the center frequency, the higher is the efficiency of 1/4λ monopole antenna, however, it is at best lower than 50% in earth typically conditioned we were also able to certify the microscopic efficiency of earth such as the current distribution alters by the differences of electrical character of earth.
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