本論文提出了具有帶通濾波器效應的功率分波四工器，共設計了三組不同的電路架構，其中二組用傳統半波長C型共振器去實現，另外一組是利用半波長共振器跟一端短路四分之波長共振器去抑制諧振頻率，最後一組使用雙模態共振器並用Via hole取代電感，相比前二組電路，面積減少了約一組半波長共振器，本電路設計使用chebyshev原型參數並計算出對應的Q值及M值去匹配。 第一組電路按照傳統的半波長共振器設計出四個通帶，使用RO4003C，厚度為0.41mm、介電常數為3.55的板材，考量到若使用直接饋入方式電路匹配會相當困難所以採用耦合饋入，四個通帶設計完成後輸出port接上Wilkinson power divider，以達成提出的設計目標。 第二組電路使用半波長共振器及四分之波長共振器分別在共振器的末端打Via hole，在倍頻明顯被抑制掉，直接半波長共振器接兩個輸出port雖然對稱性會比使用Wilkinson power divider的電路稍差，但電路面積可以減少。 第三組電路使用雙模態共振器去實現，並在輸出port接上Wilkinson power divider達到功率分波的效果，藉由調整Via hole的大小可以調整電路的頻寬，只用了一組半波長共振器，實現的面積減少許多，此三組電路的通帶中心頻率分別為2GHz、3GHz、4GHz、5GHz。 文中會具體介紹帶通濾波器效應的功率分波四工器的原理及設計流程，且實作去驗證設計理念，並比較這三組電路的優缺點。 ;This thesis proposes a compact and high-isolation microstrip quadruplexer power divider. One of the circuit consists of two traditional half-wavelength resonators C-type, another of the circuit consists of a half-wavelength resonator and a quarter-wavelength resonator with short end, the other of circuit consists of a dual-mode resonator with a via hole replace inductor. In this thesis, three different circuit architectures are designed using the different resonator. These circuits can use the Chebyshev prototype parameters to design the bands systematically. The first circuit is a quadruplexer. There are two traditional half-wavelength resonators on a 0.41 mm Rogers4003C substrate with a relative permittivity of 3.55 and a loss tangent of 0.0027. In order to matching circuit by coupling feeding line, output feeding lines and uniform resonator pairs. Finally, the output ports add wilkinson power divider to achieve design concept. The second circuit is asymmetric. It consists of a half-wavelength resonator and a short-end quarter-wavelength resonator. Due to the asymmetric structure, the harmonic response is suppressed and the circuit area is reduced. The third circuit uses a dual-mode resonator to design a filtering power divider. Similarly, the output ports add wilkinson power divider to implement. Through the change diameter of via hole and the gap of the coupling structure, the achievable bandwidth of the circuit is adjusted. Compare to the three circuits area, the last proposed is smallest. The center frequencies of four pass-band are 2 GHz, 3 GHz, 4 GHz, and 5 GHz. In this content, the design process of the quadruplexer power divider is recorded in detail and implemented to verify the design concept. The advantages and disadvantages of the three circuits are compared.
