Multilayer radar absorbing materials with light weight, strong absorption, and wide absorption bandwidth are urgently demanded with the increase of electromagnetic pollution. However, the current design methods with only simulation operation or optimization strategy are not comprehensive. Here, a simulation-optimization approach including electromagnetic simulation and numerical calculation is proposed based on the interaction between different software, in which the homogeneous medium substitution method is presented to simplify the complicated structures. Besides, return loss and impedance matching of different layer structures are investigated. From the simulated results, it can be found that the structures with better impedance matching have superior absorbing performance. The optimal method shows the advantages of fast and efficient, which has tremendous potential for various applications, such as military stealth and electromagnetic wave elimination.
A dual-band microstrip patch antenna (MPA) based on a polarization conversion metasurface structure was designed. By etching the complementary split ring resonator (CSRR) on the ground plane, a new resonance frequency is generated. The proposed antenna is obtained through optimizing the structural parameters of CSRR. Compared with the antenna without CSRR, the return loss of the proposed antenna increases by ∼40% at the original resonance frequency. The measured results are similar to the simulated results, verifying the reliability of the antenna. This work introduces a new way of designing multi-band antenna.
Tunable phase shifters with wide bandwidth are highly demanded for phased array radar systems. However, most wideband phase shifters are not tunable, while tunable phase shifters operate at a very narrow band. Here, we present a magnetically tunable wideband ferrite-based metamaterial phase shifter by periodically arranging ferrite block and air-gap. Compared to the conventional phase shifter, the operation bandwidth of the metamaterial phase shifter increases significantly because of the existence of a new resonant peak. Meanwhile, the phase shift of the metamaterial phase shifter can be altered by changing the applied magnetic field. The proposed phase shifter has low insertion loss and large phase shift value, which provides a way to the design of tunable wideband phase shifters.
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