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Any cable or wire is treated as a transmission line if its length is greater that 1/10 th of the wavelength of the signal travelling through it. Various transmission line types are the coaxial cable, strip line, micro-strip, twisted pair, balanced line, star quad, twin lead, lecher lines, wave guides, single-wire line, optical fiber, acoustic transmission lines, etc. Some important applications of transmission lines are as follows:
Transmission of high-frequency signals with minimum power loss.
Transmission lines function as a filter. For this filter, an open-circuited or short-circuited transmission line is wired in the filter. These are called stub filters.
Transmission lines are used as pulse generators. For example, Blumlein transmission line, etc.