Categorising Microstrip Distributed Elements Coupling Types

Coupling coefficient is a very important parameter in the design of RF/Microwave filters.\nUnderstanding the coupling mechanism between resonators is very important for achieving a good\nfilter layout. This paper describes a way to classify the type of couplings exhibited in microstrip\ndistributed element resonators. This method explains the coupling types from the definition of\ncoupling coefficients. All the possible coupling types, i.e. electric coupling, magnetic coupling and\nmixed coupling, will be discussed. The difference between Type-I and Type-II mixed couplings will\nbe addressed. A comparison between the numerically computed coupling coefficients and those\ncomputed using computer aided design software is also presented.