全息天線分析與波束偏移之應用

Abstract

本論文提出利用光學的干涉現象來了解毫米波頻段全息天線(Holographic antenna)的設計，且藉由陣列的形式的表面波產生器(Surface wave launcher)，製造出不同電場分布的表面波，觀察對於干涉條紋的影響，並計算出目標波束時的數學函數。 本文中全息天線模擬與實作的中心頻皆在28G，表面波產生器由1*4個挖槽波導天線陣列所構成，應用分為ϕ方向與θ方向的波束偏移，而實作部分則著重在θ方向的驗證。

In this thesis, an optical concept have applied to realize how to design a holographic antenna. By array form of surface-wave launcher to generate types of surface-wave with different e-field distribution, The effect on interference pattern can be observed. Moreover, the distribution function of hologram for field reconstruction can be calculated. The phase-shifter was used to change propagation direction of surface-wave at the feeding end and achieve the beam-steering. In this design, operating at 28Ghz, the launcher comprise 1*4 slotted waveguide antenna array. There are two dimensions for beam-steering, and focus on θ degree in realization.