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- W2568469673 abstract "The reflection method is well known as a simple and low-cost measurement method of the radiation efficiency of the small antenna. In this method, it is required to measure the reflection coefficients of the antenna in free space and in the cavity formed by the waveguide and two sliding shorts [1]. However, some dips can be observed in the frequency response of the estimated efficiency [2]. We have studied the methods of avoiding these dips by use of the transmission line model [3]. Some serious dips are caused by the resonance between the antenna and the sliding shorts in the wide frequency range. To keep from these dips, the distance between the antenna and shorts should be carefully selected as the resonances are not encountered. On the other hand, it is possible to generate small dips of the efficiency due to the resonances between two sliding shorts. These dips are localized in the extremely narrow frequency range. To avoid the small dips, we exclude the ill-conditioned reflection coefficients according to the resonant condition of the cavity, and then evaluate the efficiency based on the principle of the reflection method. In this paper, an alternative method to avoid the small dips is proposed and examined." @default.
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- W2568469673 date "2007-01-01" @default.
- W2568469673 modified "2023-09-26" @default.
- W2568469673 title "Reduction of Small Dips in Efficiency Estimated by Reflection Method" @default.
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