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In this paper, a retrodirective anatenna array system is proposed and the possibility of actively cancelling electro- magnetic waves based on this system is investigated. When a rectrodirective array system receives an electromagnetic wave, it can send waves in the direction of the incoming signal without prior knowledge of the direction. In applications to cancellation of radar signals, the system can generate and send signals to the radar so that it cancels the radar signals that are reflected back to the radar. In such a system, isolation between the input and output ports is a key factor that determines the effectiveness of cancellation. In this work, a dual-conversion mixer system is proposed to maximize the isolation. Since this minimizes the difference between the direction of reflection of radar signals and the trans- mission of cancellation signals, the effectiveness of cancellation is maximized. Experimental results for a metallic plate and metallic cylinder shows as much as 29-dB reduction in reflection for a 2×2 retrodirective array based on proposed dual-conversion mixer system, which verifies the proposed method of active cancellation.

Retrodirective Antenna Array Based on Double Conversion Mixer System and Its Application to Cancellation of Electromagnetic Reflections