| Summary: | 碩士 === 國立勤益科技大學 === 電子工程系 === 105 === In this paper, an arbitrary output power ratio one section branch line coupler is proposed. Based on two symmetry planes and the circuit analysis, using Mathematica software as the formula to derive the auxiliary program, the scattering parameters of the structure are deduced. By giving some physical parameters we have deduced the equal electrical length of any output power ratio branch line coupler, fixed electrical length of any output power ratio branch line coupler, equal transmission line impedance value of any output ratio branch line coupler, and fixed transmission line impedance value of any output ratio branch line coupler. All circuits were simulated by the EM simulation softwares, the output power ratio at working frequency can be applied to any ratio of the output power of the demand, the fabricted circuits were measured by the vector network analyzer, and the simulated and measured results are in good agreement at working frequency. The circuit design can be applied to different center frequency, easy to fabricate, and has significantly cost reduction in circuit fabrication.
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