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{{main|Stub (electronics)}}
A stub is a short length of line that branches to the side of a main line. The end of the stub is often left open- or short-circuited, but may also be terminated with a lumped component. A stub can be used on its own (for instance, for [[impedance matching]]), or several of them can be used together in a more complex circuit such as a filter. A stub can be designed as the equivalent of a lumped capacitor, inductor, or resonator.<ref>{{multiref|Edwards & Steer, pp. 78, 345–347.|Banerjee, p. 74.}}
[[File:Microstrip Low Pass Bowtie Stub Filter.jpg|thumb|alt=Five butterfly-shaped stubs in a filter|Butterfly stub filter]]
Departures from constructing with uniform transmission lines in distributed element circuits are rare. One such departure that is widely used is the radial stub, which is shaped like a [[circular sector|sector of a circle]]. They are often used in pairs, one on either side of the main transmission line. Such pairs are called butterfly or bowtie stubs.<ref>Edwards & Steer, pp. 347–348.</ref>
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