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  2. Quarter-wave impedance transformer - Wikipedia

    en.wikipedia.org/wiki/Quarter-wave_impedance...

    Inverters are classified as K-inverters or J-inverters [5] depending on whether they are inverting a series impedance or a shunt admittance. [1] Filters incorporating λ/4 inverters are only suitable for narrow band applications. This is because the impedance transformer line only has the correct electrical length of λ/4 at one specific frequency.

  3. Reflections of signals on conducting lines - Wikipedia

    en.wikipedia.org/wiki/Reflections_of_signals_on...

    A time-domain reflectometer; an instrument used to locate the position of faults on lines from the time taken for a reflected wave to return from the discontinuity.. A signal travelling along an electrical transmission line will be partly, or wholly, reflected back in the opposite direction when the travelling signal encounters a discontinuity in the characteristic impedance of the line, or if ...

  4. Transmission line - Wikipedia

    en.wikipedia.org/wiki/Transmission_line

    A type of transmission line called a cage line, used for high power, low frequency applications. It functions similarly to a large coaxial cable. It functions similarly to a large coaxial cable. This example is the antenna feed line for a longwave radio transmitter in Poland , which operates at a frequency of 225 kHz and a power of 1200 kW.

  5. Ferranti effect - Wikipedia

    en.wikipedia.org/wiki/Ferranti_effect

    Illustration of the Ferranti effect; addition of voltages across the line inductance. In electrical engineering, the Ferranti effect is the increase in voltage occurring at the receiving end of a very long (> 200 km) AC electric power transmission line, relative to the voltage at the sending end, when the load is very small, or no load is connected.

  6. Interconnector - Wikipedia

    en.wikipedia.org/wiki/Interconnector

    An electrical interconnector allows electricity to flow between separate AC networks, or to link synchronous grids. [2] [3] They can be formed of submarine power cables or underground power cables or overhead power lines. The longest interconnection as of July 2022 was the 2,210 km Hami - Zhengzhou delivering 8 GW of high voltage direct current ...

  7. Electrical length - Wikipedia

    en.wikipedia.org/wiki/Electrical_length

    The phase velocity at which electrical signals travel along a transmission line or other cable depends on the construction of the line. Therefore, the wavelength corresponding to a given frequency varies in different types of lines, thus at a given frequency different conductors of the same physical length can have different electrical lengths.

  8. Stub (electronics) - Wikipedia

    en.wikipedia.org/wiki/Stub_(electronics)

    About 1/8 wavelength long: (left) 200 MHz stub is 19 cm, (right) 300 MHz stub is 12.5 cm 10 kW FM broadcast transmitter from 1947 showing quarter-wave resonant stub plate tank circuit. In microwave and radio-frequency engineering, a stub or resonant stub is a length of transmission line or waveguide that is connected at one end only. The free ...

  9. Underground power line - Wikipedia

    en.wikipedia.org/wiki/Underground_power_line

    For example, as of 2024, the Public Service Commission of Wisconsin determined that the installation cost of a 69-kilovolt aboveground power line is $284,000 per mile. In contrast, an equivalent underground line costs $1.5 million per mile. As ratepayers ultimately bear these costs, utilities exercise discretion in selecting which lines to bury ...

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