Study of microwave filters (Part II)

Starting from a single cavity resonator, the theory of filters employing a number of these units either directly coupled or coupled by quarter wavelength coupled systems. The expressions for the insertion loss of the filters employing three and four cavity resonators are given. The design procedure for obtaining a filter with three cavities and having specified characteristics is described, Finally the experimental characteristics obtained from three cavity filters, both directly coupled and quarter wave coupled and fabricated indigenously, are discussed