以羅特曼透鏡為波束成形網絡之陣列天線實現

Abstract

在本文介紹了，以Rotman lens的概念去設計波束成形網絡，以達到具有多波束效果的應用。其中本研究，分為兩個部份。第一個部份為金屬波導型透射陣列天線在指定截面上輻射出共線分佈的多波束的設計方法。該方法是通過將二維Rotman lens的概念擴展到三維結構而開發的。金屬波導型透射陣列天線的曲面輪廓是由Rotman lens決定的。在這裡Rotman lens是由三個饋電天線到曲面輪廓間的空氣部分。第二個部分介紹了二維相控陣天線的設計，可用於近場聚焦的應用。其是利用一個以FR4為基板的Rotman lens波束形成器去激發一個二維相控陣列天線，以便在近場的地方聚焦出期望的多波束。這個天線組可以在2.45GHz下實現RFID應用。研究的最後分別進行了數值模擬跟測量結果得比較。

In this article, the concept of Rotman lens is used to design a beamforming network to achieve applications with multiple beam effects. The study is divided into two parts. First part is about the design methodology of metallic waveguide-type transmitarray antenna. This transmitarray antenna can radiate multiple beams collinearly which are distributed on a desired cut of radiation patterns. This method is developed by extending the concept of a 2-D Rotman lens to a 3-D configuration. The curved surface profile of the metallic waveguide-type transmitarray antenna is determined by the Rotman lens. Here, Rotman lens is the air part between the three feeding antennas to the curved surface. The second section describes the design of a 2-D phased array of antennas that can be used for near-field focus applications. In this design, it uses a Rotman lens beamformer with FR4 as the substrate to excite a 2-D phased array of antennas to radiate collinear multiple beams in the near-field. This antenna set is realized at 2.45GHz for RFID applications. To this end, related theoretical and simulation studies are carried out. The measurement results are compared with the results of the simulation studies.