DESIGN OF QUASI-ELLIPTIC MICROWAVE FILTER

Microwave filters are components which provide frequency selectivity and usually
designed to operate in megahertz to gigahertz range of frequencies. Basically the
microwave filters discriminate between wanted signals which should pass through the
filter and unwanted signals which will be blocked from being transmitted through the
filter. The blocked signals are the interferences which we are not interested in them.
These filters are used mainly in applications like broadcast radio, television, wireless
communication and global system for mobile communications (GSM) [6, 7]. Almost
all of the RF and microwave devices will include some kind of filtering. The
challenge in designing the filter is to design a filter which is very small in size, with
less weight and of minimum cost material, at the same time giving high frequency
selectivity and low losses. This project is about to study and do literature review on
the microwave filters which is used to design dual mode quasi-elliptic filter which is
designed in Final Year Project II. The project introduction will cover background of
study, problem statement, objectives, scope of study, relevancy and feasibility study.
Literature review will cover aspects like, theory of transmission lines and two-port
network, stepped impedance resonator, even-odd mode analysis, transmission zero,
insertion loss, spurious resonance frequency, characteristics of different filters and the
quasi-elliptic filter. The project methodology is also discussed in this project. Ideal
state results together with microstrip results are presented in this report. All the
literature view and research done on Final Year Project I is used to design the
proposed design of the dual mode quasi-elliptic in Final Year Project II.