| Summary: | 博士 === 國立交通大學 === 電信工程研究所 === 100 === The research topic in this dissertation is a complete design flow for dual-band and multi-band filter synthesis, and these synthesized filters are implemented using microstrip parallel-coupled lines structures. First of all, a novel fully analytical multi-band coupling matrix synthesis technique is provided. By simple operations, the well-known single-band coupling matrix synthesis technique is then extended for the multi-band filter design. The proposed technique guarantees the original single-band equal-ripple property within each passbands following each single-band generalized Chebyshev characteristic. Furthermore, the requested coupling matrix should be transferred into the realistic coupling schemes for the practical implementation. In this dissertation, single-path and dual-path coupling schemes are provided, and the properties of each coupling scheme will be discussed. Moreover, the design parameters of the parallel-coupled filter are related with the components of the coupling matrix, the practical parallel-coupled filter for each path will be synthesized. For the dual-path topology, the synthesized dual-band filter needs double-diplexing configuration to connect two filters of two paths. In order to further reduce the size of dual-band filters, the E-shaped resonator is proposed for its two-mode property and is useful for the development of miniaturized dual-band filters. By even- and odd-mode analysis of the E-shaped resonator, the dual-path coupling scheme is chosen for the dual-band filter design, and the practical design parameters of the dual-band filter will be extracted based on the corresponding coupling matrix. And such synthesis procedure is fully analytical and it provides an efficient design flow for the designer. Similarly, for the tri-band and quad-band filter design, the tri-path and quad-path coupling schemes are used for the coupling matrix synthesis. After grouping two adjacent passbands, the tri-band response will be separated into one dual-band response and one single-band response; and the quad-band response will be separated into two dual-band responses. In each grouped dual-band and single-band response, the corresponding E-shaped filter can be synthesized based on the corresponding coupling matrices. Finally, the double-diplexing configuration is used to connect two filters and then the tri-band or quad-band filter synthesis will be completed.
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