Three-Dimensional Extremely Tight Coupling Structures and Their Application on Broadband Coupler and Bandpass Filter

• Main Authors: Hui-Chun Chen, 陳慧諄
• Other Authors: Chi-Yang Chang
• Format: Others
• Language: en_US
• Online Access: http://ndltd.ncl.edu.tw/handle/16247041901568414915

博士 === 國立交通大學 === 電信工程系所 === 96 === This dissertation presents the research and applications of three-dimensional extremely tight coupling structures. Two of them are the modified vertically installed planar structures with dielectric block at both side of vertical substrate. With these two newly proposed structures, we have overcome the three main challenges in realization of ultra-broadband multi-section quadrate hybrid. The challenges are to obtain an extremely tight coupling value, to compensate the unequal even- and odd-mode modal phase velocitys, and to minimize the discontinuous effect at junctions. Thanks to the proposed structures a five-section ultra-broadband quadrate hybrid with excellent performance is realized. Extending the application of tight coupling structures to broadband filters, two stepped impedance resonator (SIR) structures are proposed. The proposed SIR structures are the vertically installed planar stepped impedance resonator (VIPSIR) and the suspended substrate stripline stepped impedance resonator (SSSSIR). These two filter structures can realize bandpass filters with broad passband of larger than 1:2, good and wide upper stopband performance. More importantly, conventional PCB process can be applied to mass produce both filters. The analysis procedures and the characteristics of the proposed structures are described in detail. Moreover, systematical design procedures are given and proved to be valid with several experimental examples in this dissertation.