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The radar cross-section (RCS) of power lines has an important significance for detection of the power lines. The method of moments (MoM) can calculate the RCS of power lines. However, the efficiency of the MoM is limited by the time-consuming computing process, as well as the expensive storage overhead. In order to enhance the efficiency and reduce the storage of the RCS calculation of power lines, we propose an RCS calculation method that combines the characteristic mode (CM) with a Sherman–Morrison–Woodbury formula-based algorithm (SMWA), which is referred to as a CM-SMWA. CMs are used as the basis functions for reducing the dimension of the MoM impedance matrix, and the SMWA is applied to directly solve the CMs-reduced matrix equation, which can reduce the computational time and storage. The numerical results demonstrate that the proposed method can obtain the RCS of power lines, with different incident angles and different polarizations, at a higher efficiency. At 35 GHz, compared with the conventional MoM, for a typical LGJ50-8 power line with a length of 0.276 m, the computation time is reduced by 62.4% and the memory occupation is reduced by 96.4%.

In this paper, a novel method is proposed to realize perfect anomalous reflection and refraction utilizing a metasurface composed of binary Pancharatnam–Berry (P–B) phase elements. Previous studies on perfect anomalous reflection usually suffer from low efficiency and complicated calculations. In contrast, the proposed method, which combines the metagrating theory and array antenna theory, use only two kinds of unit cell structures for both perfect anomalous reflected and refracted beams generation. As a proof-of-concept, two binary P–B phase element based metasurfaces are designed and simulated to show that the incident wave can be reflected from θi  =  60° to θr  =  60° for the perfect anomalous reflective metasurface, while the incident wave can be refracted from θi  =  60° to θt  =  60° for the anomalous refractive metasurface. The simulated results show good accordance with our theoretical predictions, indicating the anomalous reflection and refraction can be realized with high efficiency. Our method may open a new route for manipulating the propagation of the electromagnetic (EM) wave.

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The radio frequency (RF) stealth performance of noise modulated random binary phase coded continuous wave (NMRBPC CW) radar is discussed in this paper. First, the RF stealth performance is analyzed based on signal intercepted probability in theory. Second, the NMRBPC CW radar signal waveform is designed and the ambiguity function is analyzed and simulated differently. Finally, The power spectral density (PSD) of three different kinds of CW radar transmit signals are simulated and their RF stealth performance is compared and analyzed. The research shows that the NMRBPC CW radar signal waveform possesses good RF stealth characteristic.