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In recent years, jamming strategies for Synthetic Aperture Radar (SAR) pertaining to target detection and identification, such as the creation of false targets, electromagnetic (EM) deception, and signal spoofing, have been increasingly emphasized. Distinct from traditional SAR jamming approaches, the introduction of an innovative artificial material cloak in SAR target jamming presents augmented capabilities. These methods demonstrate a proficient redirection of incident EM waves in specific or arbitrary directions, effectively masking the vital information linked to critical targets. This study introduces a broadband SAR target jamming system employing an information metasurface that incorporates intelligent information processing algorithms in conjunction with a space-time-coding digital metasurface, endowing it with the capacity to adeptly modulate incident EM waves. This integration facilitates a versatile approach to jamming, enabling the deployment of multi-mode protective measures against critical targets. The conducted simulation and experiment results validate the system's ability to adjustably produce EM deception and generate multiple false targets independently of the SAR system. The outcomes of this research significantly advance the practicality of SAR protection strategies, pushing the boundaries toward more dynamic, broadband, and controllable scenarios, thereby substantially improving the concealment of critical targets in highly sensitive conflict areas. [ABSTRACT FROM AUTHOR]

In this article, an all‐metal structure antenna array is proposed. The novel hollow‐out structures are designed to achieve low profile and lightweight. The top structure of the element is also tightly coupled, once again lowering the antenna array profile. The overall size of the array is 1354.0 × 1354.0 mm2, the spacing between elements is 323.0 mm. The optimized array‐structure profile is only 0.12 λ0 (λ0 corresponds to the wavelength of 0.4 GHz). In addition, an excellent dual‐line polarization radiation is achieved by using a cross‐staggered arrangement. Both polarizations of the array have a cross‐polarization‐level of smaller than −30 dB. In order to verify the feasibility of the scheme, prototype processing and testing are carried out, and the test results are consistent with the simulation results. The frequency band covers the P‐band (0.4‐0.7 GHz). The active voltage standing wave ratios (VSWRs) are less than 2.0. In addition, the antenna array has favorable radiation characteristics. The measured realized gain varies from 14.7 to 19.6 dBi over the work band. The total antenna efficiency is higher than 83%. It can be applied to phased arrays for the satellite system and other broadband lightweight metal antennas. [ABSTRACT FROM AUTHOR]