DESIGN OF MULTI-MODE AND MULTI-BAND MICROWAVE FILTER

Abstract

A miniaturized microwave bandpass filter based on parallel connected multi-mode network is presented in this thesis. This work demonstrates a new parallel connected topology which is a combination of transversal arrays with multi-mode resonators. The parallel connected network is commonly used to achieve higher order filter due to its advantage of having flexibility of designing and tuning each resonator independently When comparing '.vith com'entional parallel connected topology, the significant difference is that each transversal path of the proposed topology can be either using multi-mode resonator or a cascaded network of single-mode, dual-mode or higher order mode resonator. The theory of this parallel connected multi-mode filter has been developed together with the experimental prototypes