![]() ![]() In such cases an alternative method for impedance-matching is to use two short-circuited stubs attached to the main line at fixed positions, as shown in the figure, Furthermore, it is very difficult to build a variable-length coaxial line with a constant caracteristic impedance. This requirement often presents practical difficulties because the specified junction point may occur at an undesirable location from a mechanical viewpoint. ![]() However, the single-stub method requires that the stub be attached to the main line at a specific point, which varies as the load imedance or the operating frequency is changed. The method of impedance matching by means of a single stub described in the previous section can be used to match any arbitrary, nonzero, finite load impedance to the characteristic resistance of a line.
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