Pillbox Window之HFSS模擬與實作

在真空電磁元件中，Pillbox Window 是連接真空和大氣的橋梁，透過它我們可以了解真空元件中電磁訊號的情況。 Pillbox Window主要檢視的物理參數為中心頻率和頻寬，機械結構和陶瓷介電係數都會影響上述兩者；本實驗製作的24GHz的Pillbox Window，主要搭配台大24GHz的EIO計畫使用，因此在規格上要達到中心頻24GHz。本論文主要分為三部分:基本原理、實驗過程、和數據分析。 (一) 基本原理:從波導管的場開始導證到阻抗，最終探討不連續面的問題。 (二) 實驗製作:從零件結構到送爐焊接加工完成的過程，並在最後進行真空測漏和網路分析儀的冷測 (三) 數據分析:回到HFSS嘗試優化頻寬，從原本的頻寬1.45GHz，優化到2GHz。

關鍵字

Pillbox Window ；等效電路；波導管阻抗；焊接；公差；中心頻率；頻寬

並列摘要

In vacuum microwave device, Pillbox Window is the bridge between atmosphere and vacuum. We could know the information in vacuum microwave device by it. The main data of Pillbox Window needed to examine is central frequency and bandwidth. The structure and the dielectric constant of ceramic can affect them. In this experiment we make the Pillbox Window that matches and is used in the EIO plan of NTU. Therefore, the central frequency has to reach 24GHz. The paper is divided into three parts: the principle theory, the procedure of experiment and the analysis of data. 1. The principle theory: the derivation from the field in waveguide to the impedance. And discuss the problem of discontinuous plane between rectangle waveguide and circular waveguide. 2. The procedure of experiment: from the constructor to finishing the welding. Test the vacuum and obtain the data by network analyzer. 3. The analysis of data: try to optimize from initial 1.45GHz to 2GHz.