Interference due to hydrometeor scatter on satellite communication links

Article Abstract:

Interference between terrestrial and satellite systems caused by hydrometeor scatter is studied. Accurate methods for predicting radio interference levels are required by the increased use of shared frequency bands between satellite and other services. Scatter by hydrometeors, which are liquid or frozen water particulates, can be the primary source of interference. Propagation paths between terminals in separate radio systems operating in the same frequency band are prerequisites for intersystem interference to occur. Among the propagation mechanisms that can contribute to interference fields are line-of-sight propagation, tropospheric scatter, diffraction by terrain and buildings, refraction and ducting by surface or elevated layers, and hydrometeor scatter. The research is intended primarily for system planning engineers interested in changes to the CCIR propagation models for interference calculation, as well as for propagation researchers.

Earth stations, Satellite communications, Telecommunications, Communications Technology, Scientific Research, Radio Communication, Signal Attenuation, Signal Propagation

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Review of finite element methods for microwave and optical waveguides

Article Abstract:

Two-dimensional finite element techniques applied to microwave and optical waveguide problems optimize their performance. Optimization requires propagation characteristic and field distribution knowledge. The full vector formulation, which uses three instead of two components to describe the fields, works best for managing practical large scale problems because its resulting matrix problem requires only standard software library packages to solve it. It is a more accurate method than scalar ones because hybrid modes can be truly represented. Spurious modes, inherent in the full vector formulation, can implement a penalty method for a partial cure. Scalar modes are attractive for computer-aided design applications because of the low computation time required for them.

Computer graphics, Microwaves, Finite element method, Wave propagation, Two-Dimensional Graphics, Function Analysis, Optical Communication

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