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  2. Balun - Wikipedia

    en.wikipedia.org/wiki/Balun

    Transmission line transformers commonly use small ferrite cores in toroidal rings or two-hole, binocular, shapes. The Guanella transmission line transformer (Guanella 1944) is often combined with a balun to act as an impedance matching transformer. Putting balancing aside a transformer of this type consists of a 75 Ω transmission line divided ...

  3. Impedance matching - Wikipedia

    en.wikipedia.org/wiki/Impedance_matching

    In electrical engineering, impedance matching is the practice of designing or adjusting the input impedance or output impedance of an electrical device for a desired value. Often, the desired value is selected to maximize power transfer or minimize signal reflection .

  4. Balanced circuit - Wikipedia

    en.wikipedia.org/wiki/Balanced_circuit

    A circuit that has the specific purpose of allowing interfacing between balanced and unbalanced circuits is called a balun. A balun could be a transformer with one leg earthed on the unbalanced side as described in the transformer balance section above. Other circuits are possible such as autotransformers or active circuits. [4]

  5. Quarter-wave impedance transformer - Wikipedia

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

    The quarter wave transformer is an alternative to a stub; but, whereas a stub is terminated in a short (or open) circuit and the length is chosen so as to produce the required impedance transformation, the λ/4 transformer is in series with the load and its length and characteristic impedance are designed to produce the required impedance ...

  6. Transformer types - Wikipedia

    en.wikipedia.org/wiki/Transformer_types

    At radio frequencies and microwave frequencies, a quarter-wave impedance transformer can provide impedance matching between circuits over a limited range of frequencies, using only a section of transmission line no more than a ⁠ 1 / 4 ⁠ wave long. The line may be coaxial cable, waveguide, stripline, or microstrip.

  7. Autotransformer - Wikipedia

    en.wikipedia.org/wiki/Autotransformer

    In a step-up transformer, conversely, the load is attached across the full winding while the source is connected to a tap across a portion of the winding. For a step-up transformer, the subscripts in the above equations are reversed where, in this situation, N 2 {\displaystyle N_{2}} and V 2 {\displaystyle V_{2}} are greater than N 1 ...

  8. Dipole antenna - Wikipedia

    en.wikipedia.org/wiki/Dipole_antenna

    The balun transfers power between the single-ended coax and the balanced antenna, sometimes with an additional change in impedance. A balun can be implemented as a transformer which also allows for an impedance transformation. This is usually wound on a ferrite toroidal core.

  9. Antenna tuner - Wikipedia

    en.wikipedia.org/wiki/Antenna_tuner

    Transformers, autotransformers, and baluns are sometimes incorporated into the design of narrow band antenna tuners and antenna cabling connections. They will all usually have little effect on the resonant frequency of either the antenna or the narrow band transmitter circuits, but can widen the range of impedances that the antenna tuner can match, and/or convert between balanced and ...