Concealed Target Detection Using S/C Dual-Band Nonlinear Antenna

Nonlinear radar systems can detect nonlinear response signals, such as harmonics and intermodulations, generated by nonlinear electronic targets. Typically, nonlinear radar systems use separate antennas for transmit (Tx) and receive (Rx) since they operate at different frequencies. However, to miniaturize the overall system, it is effective to use a dual-band antenna on a single platform. For such antennas, a high isolation between bands is essential to prevent signal interference between the Tx and Rx ports. This paper presents the detection results of nonlinear concealed targets using an S/C dual-band antenna. The proposed system operates at 3 GHz for Tx and 6 GHz for Rx, which corresponds to the second harmonic of the Tx frequency. The detection results using four different targets demonstrate the system’s capability of detecting concealed nonlinear targets.