Transmission Lines Case Study

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Question - Present a case study on different transmission lines origin and their usage. Ans - What are Transmission lines? Transmission lines are cables or other structure which are specialized and designed for conducting AC (alternating current) of very high frequencies. For such currents with high frequency, the wave nature has to be taken into account. Ordinary electrical cables are enough to carry audio signals and AC of low frequencies, like mains power in which the direction is reversed 100 to 120 times in a second but they cannot be used to carry currents of very high frequencies, above thirty kilohertz. The reason for this being that the energy is radiated from the cable in the form of radio waves and this causes loss of power.…show more content…
Audio systems - microphone to mixer in professional systems. Interconnecting consoles, processors, amps, etc. b. Co-axial cable Co-axial cables have inner wire which is conducting and is made of copper. Over this is a layer of polyethylene or teflon material. Next, it has a layer of braided copper mesh and the outermost layer is a plastic jacket. History In the year 1880, English mathematician Oliver Heaviside studies skin effect in telegraph lines. His conclusion was that by wrapping an insulating casing around a transmission line could increase the durability of the cable and also signal clarity. He patented the first Coaxial cable in England. After four years, a similar patent was registered by Siemens and Halske. In 1894, Nikola Tesla was awarded the patent for the first electrical conductor. These 3 technologies were the main components required to make the coaxial cable. In the year 1931, Lloyd Espenschied and Herman Affel Had patented the first coaxial cable on behalf of AT&T’s Bell Telephone Laboratories. The games of XI Olympiad in Berlin in 1936 was the first big event to transmit images with the help of this cable. The first commercial use of coaxial cable was in 1941 in united States where it was used to provide one television channel or 480 telephone lines. In 1956, the first underwater trans-atlantic telephone cable system was to connect European and American countries. Large scale tests…show more content…
Alexander Graham bell invented a device called Photophone, which could transmit voice on a light beam, in 1880. In the same year, William Wheeler invented a system of pipes which were lined with highly coating that gave light to homes by using light from electric arc lamp. In 1895, an attempt was made to invent television by using a bent glass rods to guide light by Henry Saint-Rene. Gradually for many years this method was used for various purposes and inventions like surgical lamp, transmitting images for television. In 1954, Van Heel covered a bare fibre with a transparent covering of a refractive index lower than that of the core and this prevented fibre reflection and thus prevented distortion and interference and also decreased the loss of

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