微波功率放大器及切換器之研究

Abstract

在這篇論文中，包含了功率放大器，及微波切換器的研究。 本論文從基礎功率放大器的設計步驟開始，引進迴授放大器的概念。詳細的理論以及設計流程也都包含於論文中。為了實現迴授放大器的理論，我們提出了一種新型態的迴授電路。此迴授架構的具備了良好的散熱效應，而且在電路方面等效於傳統的串並聯雙迴路型迴授電路。 在微波切換器方面，我們提出場效電晶體整合式共面波導的概念。此概念是適用於毫米波行波開關的設計。因為二指場效電晶體可以等效於共面波導，所以行波切換器的設計就等效於步階阻抗低通濾波器。有關細部設計流程也包含於本論文中。而行波開關的頻率限制在本論文也有詳細的討論。 最後是濾波器整合式開關。應用此概念，四分之一波長短路殘帶的帶通濾波器被整合至單刀單執或單刀雙執開關當中，並且提供了系統化的決定設計參數的方法。更進一步，我們提出了預測此開關輸出功率的方法，使用分段近似線段近似及線性電路的分析技巧，輸出功率可以被簡單的預測得知。

This dissertation includes the researches of microwave power amplifiers and switches. The theory and the design procedure of unilateralized feedback power amplifier is expanded from the conventional power amplifier design procedure. To realize the theory of the feedback power amplifier, new feedback topologies are proposed. The proposed feedback topology is equivalent to the conventional series and shunt dual loop feedback amplifier and good for heat sinking. The FET-integrated CPW is proposed for the application of millimeter-wave traveling wave switches. The extraction of the model parameters is described. By modeling the 2-finger FET into CPW, the on-state millimeter-wave traveling wave switches are equivalent to the step impedance band pass filter and the design procedure is obtained. The frequency limitation of the traveling-wave switches is also discussed. The concept of the filter integrated switch is illustrated. Based on this concept, the quarter-wavelength shorted stubs band pass filter are integrated into SPST and SPDT switch. The design parameters are systematically determined. Moreover, the power performance of the switch is described. The power performance of this circuit is predicted by the piecewise linear approximation and the linear network analysis. The method provides a easy way to predict the switch power performance.