| Summary: | 碩士 === 國立交通大學 === 電信工程研究所 === 102 === In this thesis, two types of improvement on crossover are presented. Among these two types of improvement, one of them is suitable for two quarter-wavelength branch-line coupler cascade. It is based on Composite Right/Left Handed to design in every transmission-line, so this one can work at dual-band with miniaturized. The second one is derived from traditional crossover, and it can operate at dual-band with arbitrary output phase control.
The first two chapters introduce the applications, operation principle and theory of branch-line coupler and crossover. In the third chapter, it is a dual-band crossover, by using the theory of composite right/left handed, and even- and odd-mode analysis to satisfy the conditions on crossover. After fabricating this circuit on Ro 4003 20mil, it can be presented on dual-band with miniaturized.
In the fourth chapter, it is based on even- and odd-mode analysis to derive the traditional crossover, and then we can the output port with arbitrary output phase. By using the π network, more freedom leads to operate at dual-band. After that, this circuit is fabricated on Ro 4003 20mil based on 2.4GHz and 5.2GHz.
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