在本論文中，我們提出一種利用離散時域技術來製作微波電路濾波器的新設計方法。首先，從z域中推導各種傳輸線的鏈散矩陣，接著以串接傳輸線以及並接殘段元件方式組成濾波器網路，再藉由相乘每一組傳輸線元件的鏈散矩陣，來找出此網路完整的鏈散矩陣。
此外，我們提出一種由二段開路殘段所組成的帶拒波器，它可以模擬在z域中的二階帶拒濾波器，它的頻寬、中心頻率、及高階諧波特性可以由二段殘段的特性阻抗來決定。另外，嵌入式殘段可以呈現出較高的特性阻抗，因此可以改善在止帶頻段上的衰減率，若以傳統結構這是很難實作出來的；最後，我們提出以離散時堿的合成方法設計微波主動積分器，它是由連結串接微帶線和砷化鎵場效電晶體所組成。
在論文的最後，我們利用本論文中所提出的設計方法實作多組微波電路，我們將量測所有濾波器的散射參數並與理論值進行比對，以證明本方法的可行性。

In this thesis, we propose a new design method to implement a microwave circuit by using the discrete-time domain technique. First of all, the chain-scattering matrices of variety transmission-lines derived from z-domain. Then by cascading serial transmission lines and shunt stubs component to form filter network, the overall chain scattering matrix of the network can be found by the multiplications of the chain scattering matrix of each transmission line component.
In addition, we propose the notch filter consisted of a two-section open stub that emulated a second-order notch filter in the z domain. The performances of bandwidth, center frequency and high-order harmonic frequency to the fundamental frequency are determined by the characteristic impedances of two finite sections. On the other hand, the embedded stub exhibits higher equivalent characteristic impedance and improves the roll-off rate in the stop-band which is difficult fabricate in the conventional structure. Finally, we propose the discrete-time domain synthesizing method to design microwave active integrator. The integrator formed by cascade connections of serial line and GaAs FET.
Eventually, we make use of the design method that we proposed to implement several types of microwave circuits. We will measure the S-parameter of all the filters and compare with the theoretical values to demonstrate the validity of the design method.

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