適用於Bluetooth /Zigbee / Wi-Fi頻帶之共平面帶線柴氏帶通濾波器

Abstract

本論文研製之共平面帶線柴氏帶通濾波器是利用導納轉換器與阻抗轉換器建立其等效模型;並搭配四分之一與二分之一波長諧振器來設計具有柴氏響應之帶通濾波器. 使用共平面帶線實現電路具有差動式輸出入,無需貫孔接地與空橋,且不受基板後厚度影響並可達到高特性阻抗,非常適合於平衡式無線通訊系統與射頻積體電路.

Filter design procedure is using the equivalent J and K inverter model in co-operation with lambda/2 and lambda/4 resonators to achieve Tchebyshev response, and using the CPS to implement circuit with differential I/O. The proposed circuit has the benefits of no need via holes or air-bridges, insensitive to the variation of substrate thickness, and relatively higher characteristic impedances. The proposed filters are very suitable for differential wireless communication system and radio-frequency integrated circuits.