Ku-頻帶無移相器掃描式主動天線陣列

Abstract

本論文是設計、製作、量測Ku-頻段的無移相器掃描式主動微帶天線陣列 ，此掃描式天線陣列是利用耦合式振盪器線性陣列，使主動電路能夠同相 、穩定的操作在要求的頻率範圍，再加以調整陣列兩端單元的頻率，不需 要額外的相移器即可產生連續性陣列單元間的相位變化，透過準光學的方 式使每一單元的功率在空間中有效的結合，達到電子控制式的掃描天線。 本計畫是參照加州大學聖大芭芭拉分校Dr. York和洛杉磯分校Prof. Itoh 在主動天線方面的研究而加以設計製作。在此無相移器的掃描式天線陣列 中，在維持互相耦合同步的條件下，經由調整陣列兩端單元的偏壓，可在 陣列單元間產生固定漸近的相位分佈。實際電路的量測是建立在遠場的條 件下，經由頻譜分析儀量得操作頻率為16.7GHz左右。掃描範圍在 之間， 單一單元，雙單元及四單元的有效輻射功率分別為85mW、349mW、1789mW 。 This project is to design, fabrication and measure the Ku-band phase-shifterless beam-scanning active antenna arrays. The beam scanning in linear arrays of antenna-coupled oscillators can operate at desired frequency range with in-phase and stable, then the end elements be slightly detuning frequency to provide continuously phase variation between the elements without phase shifter. Mutual coupling technique is utilized to enable them to synchronize to a common frequency through the phenomenon of injectionThis project is based on the circuit designed by Dr. York*s group of UCSB and Prof. Itoh*s group. In this phase- shifterless beam-scanning antennas arrays, it was shown that a constant phase progression can be established by slightly detuning the peripheral arrays elements, while maintaining mutual synchronization.An experiment for the beam-scanning antenna arrays has been carried out. The oscillation frequency is measured at about 16.7 GHz. It has continuously scan the radiation pattern from . An effective radiation power (ERP) of 85mW、349mW、1789mW is obtained for single-unit, two-unit and four-unit active antenna array.