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Telecommunication industry requires a new generation of multifunctional devices, simultaneously operating under more communication standards, in multi-band microwave ranges, small size, compact, robust, and low cost. Microstrip RF/microwave technology can provide these features. In this paper a multi-band filter which consists of a compact microstrip topological structure is presented. It uses a quadri-port...
Oxy-hemoglobin and deoxy-hemoglobin, main blood chromatophores flowing through the arteries and veins, respectively, reflect sunlight differently. The biggest difference is at a specific wavelength in the visible spectrum. The amount of blood in the arteries varies during cardiac activity. As a result, the skin color changes, but its limits cannot be noticed in heart cycle. The authors present an...
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