建構於蘑菇狀電磁能隙之吸收性帶阻濾波器

Abstract

由於近幾年無線通訊的快速發展，通訊技術愈來愈發達且多樣化，對於傳輸速度的要求愈來愈快並且需要將不同通訊系統整合在一起，因此過去不會發生或影響不大的問題隨著通訊發展逐漸嚴重干擾到元件或系統整體的表現，所以對於濾波器的要求愈來愈嚴格，有別於傳統的反射式濾波器，近幾年吸收性濾波器逐漸受到重視。 本論文提出新的吸收性濾波器電路原型，並且根據不同的設計可以得到窄頻及寬頻的吸收性濾波器效果。接著利用蘑菇狀電磁能隙結構(mushroom-type electromagnetic bandgap structure)及電阻和微帶線來實現吸收性濾波器，並提出等效電路模型及設計流程。最後實驗結果也如預期表現出寬頻吸收性濾波器的效果，雖然有些微差異但整體趨勢是一致的，證實了我們電路模型及設計流程的準確及可信度。另外經由實驗與模擬做比較，找出了量測與製程誤差對於元件表現影響較大的主要因素。

Due to the rapid development of wireless communications in recent years, communication technologies have become more and more developed and diversified. The requirements for transmission speeds are getting faster and faster, and different communication systems need to be integrated. Therefore, problems that will not occur or have little impact in the past have arisen. As the development of communications has gradually interfered with the performance of components or systems as a whole, the requirements for filters have become more and more stringent. This is different from conventional reflective filters. Absorbing filters have received increasing attention in recent years. This research proposes a new prototype of the absorptive filter circuit, and according to different designs can obtain narrowband and broadband absorptive filter effects. Then, a mushroom-type electromagnetic bandgap structure, resistors and microstrip are used to implement an absorptive filter, and an equivalent circuit model and design flow are proposed. Finally, the experimental results also showed the effects of broadband absorption filters as expected. Although there were some slight differences, the overall trend was consistent, confirming the accuracy and reliability of our circuit model and design flow. In addition, through the comparison of experiments and simulations, the main factors affecting the performance of components are found out in the measurement and process errors.