A microwave imaging system is provided, which includes a signal transmitting circuit, a signal receiving circuit and a signal processing and computing circuit. The signal transmitting circuit emits at least one microwave signal having at least one frequency toward an object-under-test, and the signal receiving circuit receives the microwave signal through the object-under-test or reflected by the object-under-test. The signal processing and computing circuit is configured to generate the microwave signals with different frequencies. The signal processing and computing circuit generates a detection image according to the microwave signal received by the signal receiving circuit. Each the transmitting antenna of the signal transmitting circuit and the receiving antenna of the signal receiving circuit is a planar metamaterial antenna respectively, and the planar metamaterial antenna includes a plurality of resonance units arranged regularly.一種微波成像系統,其包括訊號發射電路、訊號接收電路,以及訊號處理與運算電路。訊號發射電路朝向待測物體發射出具有至少一頻率的至少一微波訊號,而訊號接收電路接收穿透此待測物體的微波訊號與此待測物體所反射的微波訊號。訊號處理與運算電路用以產生具有不同頻率的微波訊號。訊號處理與運算電路並根據訊號接收電路所接收的微波訊號而產生待測物體的檢測影像。訊號發射電路的發射天線與訊號接收電路的接收天線各自為一平面超材料天線,且此平面超材料天線包括週期性排列的多個共振單元。10‧‧‧微波成像系統110‧‧‧訊號發射電路111‧‧‧發射器112‧‧‧發射天線120‧‧‧訊號接收電路121‧‧‧接收器122‧‧‧接收天線100‧‧‧待測物體130‧‧‧訊號處理與運算電路140‧‧‧電腦SS1、SS2‧‧‧微波訊號
