Quarter-Wave Stub

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quarter-wave stub [′kwȯrd·ər ‚wāv ¦stəb]

(electromagnetism)

A section of transmission line that is one quarter-wavelength long at the fundamental frequency being transmitted; when shorted at the far end, it has a high impedance at the fundamental frequency and all odd harmonics, and a low impedance for all even harmonics. Also known as quarter-wave line; quarter-wave transmission line.

Quarter-Wave Stub

(also quarter-wave line), a section of a microwave transmission line that is a quarter-wavelength long at the fundamental frequency being transmitted. The input impedance of a quarter-wave stub is inversely proportional to its load impedance. This property of quarter-wave stubs makes it possible to use such stubs in many microwave devices, such as quarter-wave transformers and antenna switches.

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