多頻段單脈衝雷達天線系統設計

Abstract

本篇論文提出了一種多頻段的單脈衝天線及6 – 10 GHz三通道多工器的設計流程、模擬與實驗結果。單脈衝天線由貼片天線、威爾金森功率分配器與環混成器設計而成，並整合在單一基板上，不但有輕量與縮小化的優點，且可大幅降低製作的困難度，減輕成本負擔。在這裡我們使用CST電磁模擬軟體分析天線的S參數與遠場輻射場型，並利用Microwave Office 電路模擬軟體設計出三通道多工器，再與實做進行比較，其模擬與量測結果均非常吻合。最後，我們利用多工器整合設計出三個頻段之單脈衝天線系統，藉以達到寬頻操作之目的。

This paper presents the design procedure, simulation, and experiment results for the monopulse radar antenna designed at 10 GHz and the 6 to 10 GHz three-channel multiplexer. The monopulse antenna composed of patch antennas, a microstrip hybrid ring coupler, and the Wilkinson power divider is fabricated on a single substrate, which takes the advantages of lightweight, small size, reduced the difficulty of manufacture substantially and low cost. Here, we employ the CST electromagnetic simulation software to analyze the scattering parameters and the far-field radiation patterns of the purposed antenna, and the circuit simulator, Microwave Office, to design the three-channel multiplexer. In comparison with the experiment results, good agreements between the theoretical and measurement results are obtained. Besides, we use the same design procedure to realize the monopulse antenna at 6 and 8 GHz and to integrate the three designed systems using a triplexer to achieve the wideband application.