使用基板合成波導之60GHz四乘四巴特勒矩陣之研製

Abstract

本篇論文主要敘述使用基板合成波導結構，製作兩種不同結構的3dB耦合器與巴特勒矩陣。兩種耦合器結構分別為側邊開槽耦合器與上方開槽耦合器，並用Roger RT/duroid 5880®板材製作，最後利用此兩種耦合器結構研製一四乘四巴特勒矩陣，設計之電路頻率為60GHz。基板合成波導因具有低損耗特性，目前已漸廣泛應用於微波與毫米波電路設計，並可利用簡單的轉接結構，將設計之電路整合在一片基板上。 本論文各章節先整理敘述各元件之設計公式，以得到各電路設計初始值，再利用美商恩碩公司Ansoft HFSS®軟體模擬各電路結構，並依據模擬結果，利用Roger RT/duroid 5880® 10mil板厚之雙層板，分別製作基板合成波導之側邊開槽耦合器、上方開槽耦合器與四乘四巴特勒矩陣。 本論文共分五個章節。第一章為簡介，說明研究動機與相關文獻，並簡介各章內容。第二章敘述基板合成波導結構與特性。第三章則利用基板合成波導結構設計側邊開槽耦合器與上方開槽耦合器結構，並敘述設計公式與原理，以及在量測多埠網路電路時，所會面臨的問題與考量。第四章則敘述使用第三章所設計之3dB耦合器，研製基板合成波導四乘四巴特勒矩陣。最後針對本論文的研究成果，於第五章總結。

In this thesis, two different structures of 3dB couplers and a 4 x 4 Butler matrix using substrate integrated waveguide (SIW) are designed. The two couplers, a short-slot coupler and a top-wall coupler, are fabricated on Roger RT/duroid 5880® substrate. In addition, the 3db couplers are used to realize a 4 x 4 Butler matrix. The circuits are designed at 60GHz. SIW is a known structure to have the characteristics of low loss and can be easily integrated with other planar circuits on a single printed circuit board (PCB) for microwave and millimeter-wave components. The circuit simulation is performed by using Ansoft HFSS® 10.0 along with initial parameters calculated by the design formulas given in each chapter. Based on the simulation results, a short-slot coupler, a top-wall coupler and a 4x4 Butler matrix are implemented on a double layered Roger RT/duroid 5880® with 10mil thickness. This thesis is composed of five chapters. In Chapter 1, study motivation and paper survey are presented. Chapter 2 reveals the characteristics and structure of SIW. Chapter 3 describes the formulas to design a short-slot coupler and a top-wall coupler using SIW structure. Problems and considerations related to multi-port circuit measurement are also discussed. Using the 3dB couplers designed in Chapter 3, a 4x4 Butler matrix is designed with measured results in Chapter 4. Finally, this research study is concluded with Chapter 5.