| Summary: | 博士 === 長庚大學 === 電子工程研究所 === 93 === In this thesis, a generalized method for synthesizing asymmetrical couplers with arbitrary termination impedances and output power division is firstly proposed. In the development of synthesizing method, a generalized even- and odd-mode analysis concept method is derived for analyzing the asymmetrical structures, which have the same impedance ratio with respect to the reference planes. The proposed method can provide more flexible design concept than conventional even- and odd-mode analysis method. With applying the proposed method, three types of direction couplers with arbitrary termination impedances and output power division are designed and discussed.
The second part of this thesis, two kinds of symmetrical couplers will be described in this thesis. A novel coupler structure of two-sectional transformer-coupled -network is firstly presented. The proposed structure used fewer components than conventional configurations can provide more than one set of design conditions. The optimum one of the conditions is then used to verify the design concept. Another coupler structure having wide-band characteristic and an arbitrary coupling coefficient is proposed. The effectiveness of the proposed method was verified by the design and measurement of two experimental prototypes with 10 and 20 dB coupling, respectively. Finally, we implement the two kinds of the symmetrical couplers on low temperature co-fired ceramic (LTCC). It shows the size of the prototypes on LTCC substrate compared with the PCB version save about 80%.
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