Coupling of Modes of Propagation

摘要

When two lossless modes of propagation are coupled, waves which increase or decrease with distance may arise when the power flow of the two modes is in opposite directions or when power is generated in the coupling device. This behavior is characteristic of wave filters, traveling‐wave tubes, double‐stream amplifiers, and space‐charge‐wave amplifiers. Such behavior is analyzed assuming linearity and conservation of energy only.