A thin and optically transparent infrared-radar compatible stealth structure with low emissivity and broadband absorption

Abstract

In this paper, an optically transparent structure that combines broadband absorption and low infrared (IR) emissivity for dual-band stealth is proposed. The whole structure includes two functional layers. The periodic resistive film of the upper functional layer acts on IR stealth. Its emissivity in the IR band of 8–14 μm is lower than 0.25. Another functional layer achieves greater than 90% wide absorption from 6 to 18.5 GHz. The whole optically transparent composite structure has a low profile of 0.141λ 0, where λ 0 is the wavelength of free space at the center frequency. It has absorptivity that is greater than 90% in the region of 5.7–16.5 GHz and has wide angular stability. The measured result is consistent with the simulation, which verifies the performance of the proposal. The IR-radar compatible stealth structure proposed in this paper has potential applications in the field of multi-spectrum compatible stealth.