In a hollow metallic waveguide , a longitudinally movable metallic plane surface that reflects essentially all the incident energy. Note: A piston is used for tuning , e.g., fine-tuning a resonant cavity . Synonym plunger.
PISTON
Meaning of PISTON in English
Telecommunication standard terms English vocab. Английский словарь стандартных телекоммуникационных терминов. 2012