W 頻段基板整合波導T型與枝幹型頻率雙工器設計

Abstract

本論文製作W頻段基板整合波導之帶通濾波器與頻率雙工器，使用柱狀濾波器架構來實現帶通濾波器，並設計兩種型態之頻率雙工器，一為T型頻率雙工器，另一為枝幹型頻率雙工器，T型頻率雙工器之優點為架構簡單且電路面積小，而枝幹型頻率雙工器之優點為可設計之參數較多，可達到良好的頻率雙工器響應。 T型頻率雙工器設計的低頻中心頻為81 GHz，高頻中心頻為93 GHz，頻寬皆為3 %，枝幹型頻率雙工器設計三種不同頻率間隔之電路，一為操作在中心頻81 GHz與93 GHz的頻率雙工器，二為操作在中心頻85 GHz與93 GHz的頻率雙工器，及中心頻90 GHz與93 GHz的頻率雙工器，雙工器頻帶越相近由於電路尺寸很小易與鄰近頻帶干擾，設計的難度越高。 電路實作上帶通濾波器及頻率雙工器皆使用基板厚度10 mil，介電常數 2.2 的 Rogers RT- Duroid 5880TM 板材，並連接轉換器與矩形波導進行量測。

The design of W-Band Substrate Integrated Waveguide (SIW) T diplexer and bifurcated diplexers are presented in this thesis. To achieve two types of diplexers, we design inductive-post filter for various frequencies. The proposed diplexers involve two types, the T diplexer and the bifurcated diplexer. The advantages of T diplexer are its simple structure and compact size. There is more design variables in the design flow of bifurcated diplexer in order to obtain better response. The bandwidths and center frequencies of T diplexer are 3%, 81GHz, and 3%, 93GHz, respectively. The center frequencies of three bifurcated diplexers are 81 GHz, 93 GHz and 85GHz, 93GHz and 90GHz, 93GHz, respectively. The circuits are fabricated using Rogers RT- Duroid 5880TM substrate with thickness of 10 mil, dielectric constant of 2.2, and dielectric loss tangent of 0.002. All of the fabricated circuits are connected to SIW to rectangular waveguide transition and measured by vector network analyzer.