應用於自導式天線陣列的類比波束成形電路

Abstract

本論文在研製一個自調式天線陣列相位調整電路。運用印刷電路板來實作，用兩個天線接收並將工作頻率設定操作在900MHz，偵測接收波的範圍在-90度到+90度。此電路的優勢在於不用知道接收波的方向在偵測的範圍內，即可自我調整相位到同相位。經實際測試驗證，最終兩個天線接收合成的功率變化小於0.5dB，即是接近同相位。此外除了連續波（CW）可運用外，包含調變訊號（Modulation Signal）的無線波，如16-QAM，也可以利用此電路來自我調整，以提高訊號接收的性能。

A phase compensation circuit is designed for self-steering antenna arrays. The approach is verified by a PCB module operated at 900 MHz. The advantages of the proposed design include improved phase detection without ambiguity of the arrival direction and with small tuning range of the phase shifting. The summed output power varies less than 0.5 dB in the measurement of sinusoidal input signals. Signals with 16-QAM modulation are also inspected with good phase compensation.