Synthesis Of Microwave Filter With Finite Dissipative Loss

Kong, Feng Yuan (2012) Synthesis Of Microwave Filter With Finite Dissipative Loss. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This project presents a procedure for synthesizing microwave filters with finite dissipative loss. The performance of microwave filters is depending on the Q factor of resonators. The high Q factor of resonator is leading to high performance of the filters. However, high Q factor of resonator is leading to expand its physical volume and expensive technologies. In order to solve the problem of the expansion of physical volume, the Q factor is decreased with finite dissipation element are used. Yet, it causes the degradation of the performance of the filter. Therefore, the main objective is synthesizing filter by using technique loss compensation which allow for realization of filter with lossy responses that equivalent to lossless responses although at an increased of insertion loss and return loss. This technique enables filter with finite unloaded Qu factor to be directly synthesized while maintaining the desired selectivity in the passband. Hence, the microwave filter can be designed with low resonators, which will significantly contribute to the reduction of its physical volume with retain the sharp characteristic of filter response. In this project, the technique of filter synthesis based upon reflection-mode hybrid technique. Besides that, the numerical designs are also demonstrated and finally the tables of prototype element values for the function are also provided. The technique of filter synthesis with finite dissipative element would be useful for application where the increased loss can be tolerated as well as reduction of physical volume; thus, its useful in designing microwave filter for receiver systems such as in a satellite input multiplexer (IMUX).

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