W頻段防撞雷達前端系統與Ku頻段類比移相器

Abstract

本論文提出一個77 GHz車用防撞雷達射頻前端系統和一個12.45 GHz之類比移相器。本文前半部描述防撞雷達射頻前端系統的組成元件及整體設計、量測結果。系統之Conversion Loss約為9.3~13.3 dB、RF輸出功率約為3.2~4.4 dBm。整體電路以共平面波導的形式製作在介電係數為9.8厚度為15 mil的三氧化二鋁的基板上。 本論文後半部份對反射式移相器做分析設計與實作量測，相位偏移量達120度，並且實作跟量測一陣列天線單位電路，天線主波束可在俯仰角35度至60度間切換，整體電路以微帶線型式製作在介電係數為3.38厚度為20 mil的RO4003的基板上。

In this thesis, a 77 GHz front-end system for collision avoidance vehicle radar and a 12.45 GHz analog phase shifter for phased array antenna are proposed. In the first part of this thesis, each individual circuit of the RF front-end, integration of the RF front-end, and measurement of the RF front-end and each individual circuit are described. The conversion loss of the RF front-end is about 9.3 to 13.3 dB and the RF output power is about 3.2 to 4.4 dBm.The whole circuits are integrated with CPW on an Al2O3 substrate with a dielectric constant of 9.8, a thickness of 15 mil. In the second part of this thesis, the design and measurement of reflective phase shifter are presented. The maximal phase shift is larger than 120 degree. A unit circuit of phased array is implemented and measured, which includes an analog phase shifter, a coupler, and a phase compensation transmission line. The mainbeam of the array can be switched between 35 to 60 degree in vertical direction. The whole circuits are fabricated with microstrip line on a RO4003 substrate with a dielectric constant of 3.38, a thickness of 20 mil.