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With the decrease in the overall size and the rapid increase in the working frequencies of printed circuit boards, the reliability of solder joints, especially the high frequency signal transmission reliability has become the key factor in system reliability. In this paper, changes in RF impedance of solder joints in a temperature cycling environment was studied using time-domain reflectometry measurements...
Vivaldi antenna becomes a hot topic because of its band width, simple structure, easy processing, light weight and low cost. It is often used in communication system. This paper designed a Vivaldi antenna which can work on L, S, C, X, Ku band together. The proposed antenna has dual-slot conduction and “T” shaped feed structure, which effectively improve the antenna's directivity. And it has the advantage...
A wideband stacked patch antenna is presented in this paper. The proposed antenna consists of a stacked structure and rectangular shell under the finite ground of the antenna. A 91.7% bandwidth is obtained by carefully arranging the relative permittivity of the substrates of the upper and lower layer. The proposed antenna is suitable for the modern communication systems.
Research is done on arrays composed high gain Yagi antennas with end-fire radiation and vertical polarization. This paper mainly studies different arraying methods of the Yagi antennas and analyzes the coupling effect between array units. It includes arraying in three directions (X, Y and Z). The Yagi antenna unit is microstrip magnetic dipole antenna of which the elements are based on a new microstrip...
We reported in this letter a dynamic switch of broad-band microwave in microstrip line based on controllable hollow cathode discharge plasma. The measured transmission efficiency of the plasma switch was 10–30% for 1–9 GHz microwave comparing with the full stripline. The transmittance signal responded to the discharge current simultaneously. It was demonstrated that the hollow cathode discharge plasma...
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