A COUPLED PENDULA SYSTEM AS AN ANALOGY TO COUPLED TRANSMISSION-LINES

The aim of this paper is to present a practical and easy to analyze co upled pendula system in order to demonstrate, by analogy, the behavior of coupled transmission lines and related devices, The importance of the Coupled Mode Theory is first explained and its derivation is worke d out through the use of the spring-coupled pendula, followed by a sta tement of the theory and its restrictions, The theory is then used for coupled transmission lines in general and a comparison is made betwee n the coupled pendula and coupled transmission lines in order to extra ct analogous quantities and to recognize the limitations of such an an alogy, The coupled pendula are then used to demonstrate the behavior o f a forward coupler, tunable filter, optical switch, and parametric am plifier.