Abstract
This chapter provides an overview of the theory of reactive pistons. Reactive pistons in the coaxial line ensure an almost total reflection in a certain frequency range and direct contact between the external and internal conductor of the line is absent. The chapter also discusses the elementary theory of such pistons as well as a more accurate electrodynamic theory in which the diffraction at the open end of the piston is taken into account. It also presents the physical analysis of the cut-off effect as well as the analysis of corrections which arise in passing from elementary to electrodynamic theory. The derived exact solution allows a more accurate calculation of the coefficients of reflection, transmission, and turning than by means of the elementary theory.
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