| Summary: | 碩士 === 國立交通大學 === 電信工程系所 === 94 === This thesis presents the fast realization of filter configurations based on analytical analysis of the proposed structures and CAD method for synthesis and diagnosis of the electrical parameters of the filter, i.e., the coupling matrix. The design procedures avoid consuming large amount of time in circuit tuning.
In the extended doublet coupling scheme, we realize two categories of filter requirements. One is for high skirt selectivity. The other is for in-band flat group delay, which has been demonstrated in association with the signal distortion. As exhibited in the thesis, we successfully eliminate the unwanted coupling that would degrade the performance of in-band group delay. The measured data validate the possibility with the variation of in-band group delay less than 0.5 ns.
As for the 3rd-order transversal filter, we establish an algorithm for quick estimation of the related electrical parameters to be determined. We define a new parameter, the impedance ratio r, and observe its importance in realization of the filter. This algorithm only involves a few of iterations due to its fast convergence. Good agreement between analytical computation and measured results indicates that such approach is practical and useful.
In order to meet the requirement in nowadays communication systems, we design these filters with center frequency at 2.4 GHz for easy integration in the environments of IEEE 802.11 b/g, ISM, and Bluetooth standards.
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