應用於微波偵測儀之波束傾斜雙頻槽孔式基板合成波導陣列天線

Abstract

本論文將提出一個在24GHz及36GHz之雙頻洩漏波槽孔式波導陣列天線(Slotted Waveguide)，且有主波束與極化方向皆為45˚的特色、尾端能量剩10%以下。論文中的天線為兩層的架構，下層為傳統槽孔式波導陣列，且波導結構是以基板合成波導形式(Substrate Integrated Waveguide)實現，上層則是由相對應下層槽孔的金屬貼片所構成，上下兩層基板皆選用Duroid5880的板材。傳統之洩漏波槽孔式波導陣列皆是利用基模之快波頻段輻射，此論文利用上層金屬貼片之影響，激發波導內的高階模，使得高階模之快波頻段可以被我們利用來輻射。 論文以全波模擬軟體萃取一維週期性結構單元(Unit Cell)的相位常數(Phase Constant)、衰減常數(Attenuation Constant)。使得24GHz及36GHz分別落在基模與高階模之快波頻段，再將此基本單元組成一個15單元之雙頻槽孔式波導陣列，最後再以實作量測結果驗證。

In this thesis, we introduce a dual band tilted beam slotted substrate–integrated -waveguide antenna. The antenna in the thesis is a two- layer structure; the bottom layer is the conventional slotted waveguide, and the waveguide structure is realized by substrate integrated waveguide(SIW); the top layer is a metal patch array which is just above the slot array on the waveguide surface with two-layers Duroid5880 substrate. Conventional slotted waveguide use the fast wave region in the fundamental mode to radiate. By the effect of the top layer patches, we can excite the high order mode of the waveguide structure to acquire another fast wave radiation region. Using the full wave simulator, HFSS, to analyze the phase constant and the attenuation constant of the unit cell such that 24GHz and 36GHz are in the fast wave region of the fundamental mode and high order mode respectively, and we organize a 15 units dual band tilted beam slotted substrate-integrated- waveguide and verify the experiment result to the simulation result.