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An ultra-wideband(UWB) Vivaldi antenna designed to detect brain tumor is presented in this paper. By transforming the conventional two-layer Vivaldi antenna into a three-layer structure, the cross-polarization effect of antenna is sharply reduced. Based on different conductivity of brain tissues, the microwave absorption effect of brain tumors is analyzed in the end, which indicates the broad prospect...
In this paper, analytical expressions of the input reflection coefficient at the source and the load ports of a two-port active microwave component are proposed. It utilizes the load-dependent -parameters in the development of these expressions. In contrast to the classical small-signal -parameters based approach, the cross frequency conversions and harmonic mismatch effects are taken into consideration...
A compact novel topology rectenna system is presented. The proposed rectenna is developed by decomposition a rectenna topology into two function parts, and then re-combination the two parts into a new topology to reach a very compact system size. The operation mechanism of the proposed novel topology rectenna is explained and analyzed. In addition, the proposed architecture is uni-planar, robust and...
The work presents a design of millimeter-wave conical conformal dual-band microstrip antenna array. At first, the insert middle feed method is used to design the rectangle patch element. Based on this element and parallel feed network, a conformal dual-band microstrip array on a cone surface is designed. Simulation results by the CST are given to show that the conformal dual-band array works at millimeter-wave...
Toward the traditional millimeter-wave microstrip antenna having narrow band and high side-lobe causing severe influence to radiation of antenna, a novel 8 element feed network is designed, which has a asymmetry structure. Comparing with traditional antenna array, we certify this kind of antenna has ability to wide bandwidth and enhance performance of patterns. The bandwidth of the antenna is about...
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