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A waveguide operated at frequencies lower than its cutoff frequency (wavelengths longer than its cutoff wavelength) and used as a precision attenuator is also known as a "waveguide below-cutoff attenuator."
- Jan Kieleczawa (2004). DNA sequencing: optimizing the process and analysis. Jones & Bartlett Publishers. p. 190. ISBN 978-0-7637-4782-4.
- D. H. Russell (Dec 1997). "The waveguide below-cutoff attenuation standard". IEEE Trans. Microwave Theory and Technology. 45 (12): 2408–2413. Bibcode:1997ITMTT..45.2408R. doi:10.1109/22.643852.
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