本論文將利用慢波結構具有較大的傳播常數之特性，來實現環形槽孔天線尺寸的微型化，並提出一種能用於環形結構之扇形邊界條件的設定方法，結合天線等效電路的觀念，利用週期性結構作為天線的負載結構，以形成慢波結構達到更低的諧振頻率，進而達到微型化的尺寸。 第一部分會設計S波段中的 2.45 GHz 微型化環形槽孔天線，利用週期性結構中的負載來提高傳播常數，以降低天線的共振頻率，最後尺寸縮小比例達58.04%。第二部分則是設計X波段中的 10 GHz 微型化環形槽孔天線，尺寸縮小比例達42.1%。第三部分會將 2.45GHz 及10 GHz微型化環形槽孔天線設計成 1×4 天線陣列，驗證微型化結構有助於改善陣列天線的隔離度，最後設計巴特勒矩陣作為饋電網路以達到波束轉換的目的。 ;In this paper, a miniaturized design of annular slot antenna is presented by using slow-wave structures for its larger propagation constants to achieve miniaturization. Besides, it also proposes a method for setting sector boundary conditions of annular structures and combining the concept of antenna equivalent circuits with slow-wave structures formed by periodic structures with loads to achieve miniaturized size. In the first part, a miniaturized annular slot antenna operating at 2.45 GHz in the S-band is designed. By using loads in the periodic structure to increase the propagation constant and reduce the antenna′s resonant frequency, the size is ultimately reduced by 58.04%. In the second part, a miniaturized annular slot antenna operating at 10 GHz in the X-band is designed, achieving a size reduction of 42.1%.The third part designs the 2.45 GHz and 10 GHz miniaturized annular slot antennas into a 1x4 antenna array to verify that the miniaturized structure improves the isolation of array. Finally, a Butler matrix is applied as the feeding network for beam switching.
