DESIGN OF MULTIBAND FILTERS BASED ON HYBRID POLYNOMIALS

Multiband filters are gaining importance in filter design industry due to the increased
demand in multi-bandwidth support and coexistence in a single device. Although many
researches had been done, The key challenges can be seen in its sizing, complexity and
lack of a comprehensive synthesis method that covers both lumped and distributed
element. Two approaches of generating a multiband response based on the concept of
hybrid polynomials is presented in this thesis. The first approach modifies the existing
Chebyshev type I polynomials to generate a symmetrical dual-band response. The
second approach modifies the existing Chebyshev type I polynomials to generate a
symmetrical tri-band response. The two approaches presented is capable of forming an
analytical model (that is the transfer and reflection function) in the beginning of the
designing process. The analytical model allows for better designing process in terms of
greater design flexibility, control and analysis. In this thesis, Both approaches discussed
will be experimented as a proof of concept of the feasibility of hybrid polynomials.