利用新波束掃描技術之導波管饋入微帶天線陣列

Abstract

本論文提出一個新的波束掃描技術，使用矩形導波管饋入微帶天線陣列。導波管裡以插入金屬片改變導波管的寬度，可以改變電磁波行進時在相鄰隙孔間的相位差，進而控制天線陣列波束輻射的方向。當我們置入的金屬片厚度或位置不同時，傳播常數也會因此而不同，依所需波束掃描的角度範圍，便可簡單設計所需改變導波管的寬度。 每個串接饋入天線陣列的輻射能量可由改變隙孔的尺寸及開路段的長度而達到；串接饋入天線陣列則利用IE3D設計及模擬。以導波管饋入微帶天線陣列可以減小微帶饋入線的損耗；最重要的是，只需些微改變導波管的寬度，即可達到很大的掃描角度範圍。

This thesis presents a novel beam-steering technique using microstrip antenna arrays fed by rectangular waveguide. We can control the radiated direction of the antenna arrays by changing the phase delay between the adjacent apertures, It is the way by varying the width of waveguide with installing a metal plate. When the thickness or position of the metal plate we installed is different, the propagation constant is also different. It is easy to design the change of the width of waveguide for the scanning angular range. The excitation of the individual series-fed array was achieved by varying the dimension of the aperture and the length of open stub. Series-fed antenna array was designed and simulated by IE3D. There are the least loss of microstrip line for microstrip antenna array fed by waveguide. It is most important that, changing the width of the waveguide slightly could scan a big angular range.