نتایج جستجو برای: beam forming
تعداد نتایج: 225735 فیلتر نتایج به سال:
In this paper, the design and implementation of plasma antenna array with beam forming is discussed. The structure consists of a circular array of plasma tube enclosed in a unipolar UHF band monopole antenna. Beam forming is possible by stimulated plasma tubes. The combination of the above antenna with plasma excitation controller makes a beam forming smart antenna. An experimental model in UHF...
Laser forming is a modern process which is mainly used for forming metals. Different Lasers are used in this regard that includes Nd: YAG and CO2. In this study, forming bi-layer sheets of Aluminum/Ceramic by Laser was investigated. Furthermore, effect of Uniform and Gaussian heat flux distribution in different power, velocity, and beam diameters on bending angle was studied. FEM simulation ind...
Laser beam forming is a novel technique developed for the joining of metallic components. In this study, an overview of the laser beam forming process, areas of application, the basic mechanisms of the laser beam forming process, some recent research studies and the need to focus more research effort on improving the laser-material interaction of laser beam forming of titanium and its alloys ar...
Every cellular generation has offered new bands, lower latency, and faster data rates. What really defines wireless generations are the major technology shifts that set them apart. The transition from analog to digital communications marks the boundary between 1G and 2G. 3G introduced CDMA techniques for significant spectral efficiency gains. 4G LTE is nearly at the theoretical limits of wirele...
Every cellular generation has offered new bands, lower latency, and faster data rates. What really defines wireless generations are the major technology shifts that set them apart. The transition from analog to digital communications marks the boundary between 1G and 2G. 3G introduced CDMA techniques for significant spectral efficiency gains. 4G LTE is nearly at the theoretical limits of wirele...
laser forming is a modern process which is mainly used for forming metals. different lasers are used in this regard that includes nd: yag and co2. in this study, forming bi-layer sheets of aluminum/ceramic by laser was investigated. furthermore, effect of uniform and gaussian heat flux distribution in different power, velocity, and beam diameters on bending angle was studied. fem simulation ind...
در این پایان نامه به نحوه ی طراحی آنتن رفلکتور با سطح شکل داده شده پرداخته می شود. آنتن های رفلکتوری شکل داده شده با یک آنتن تغذیه به دلیل عدم نیاز به شبکه تغذیه پیچیده یک کاندید بسیار مناسب برای ماهواره ی geo بومی می باشند. در سال های اخیر، این آنتن ها در بسیاری از ماهواره ها جایگزین آنتن های رفلکتوری چند بیمه که نیازمند یک شبکه پیچیده beam forming می باشند، می شوند. در این آنتن ها ابتدا شکل ج...
Antenna arrays yield multiple, simultaneous available beams. These beams can be made to have high gain, low side lobes and controlled beam width. In conventional beam forming, the smallest beam width depends on the geometric dimensions of the receiving array. This problem may overcome by the Hyper beam invention. The linear array when implemented using Hyper beam technique, there is a considera...
Robust Adaptive Beam forming algorithms face many insidious issues such as array steering vector errors which can significantly alter the array gain expected through beam forming. Other issues include coherent signal and interferers, problems like small sample size broadband interferences and so on. Therefore, there is a need to explore and investigate such beam forming methods that solve such ...
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