本論文第一部份是探討螺旋天線之設計，首先針對材質的選用進行分析，依照螺旋天線理論及方程式，以設計出L頻帶接收天線，並利用各式儀器量測出增益、中心頻率、頻寬、場圖及阻抗等相關數據。第二部份則將螺旋天線架設於碟型天線上，替換成饋源使用，並與傳統天線做比較，進行接收時相關數據的量測與分析，其效率及成本皆優於傳統碟型天線。 The first part of the thesis is discussing the helical antenna design method. First of all, we will analyze many kinds of materials. Further, we use the helical antenna formula to design the L-band helical antenna with center frequency of 1.52 GHz. Then we will use some equipment to measure the gain, center frequency, bandwidth, pattern and impedance etc. The second part, we will use this antenna to replace the feed on the dish antenna. Then we will measure and analyze the performance in comparison with traditional antenna. Beside our antenna exits better performance and lower cost than traditional antenna.
