A matrix-partitioned domain decomposition method based on integral equation using the outof-core iterative solver is presented for accurately analyzing challenging electromagnetic scattering problems with limited memory. The proposed method is based on the domain decomposition strategy, which decomposes the original large complex matrix of the electrically large problem into several submatrices of the electrically small sub-problems. Then, the out-of-core solver is used to solve the partitioned matrix equation panel by panel. In the process of constructing sub-problems, the proposed method does not introduce any additional unknowns. Thus, it can significantly reduce memory consumption, expanding the scale of the problem that can be solved. Numerical examples demonstrate that the method is very accurate even for the EM scattering targets the RCS of which are below-40 dBsm. And it can completely eliminate the pseudo edge effect which often occurs in the implementation of the domain decomposition method. In addition, modeling and partitioning the subdomains of the proposed method is easy and flexible. INDEX TERMS Matrix partitioning, domain decomposition, surface integral equations, out-of-core solver.
Ultrashort pulse (USP) signal with high peak power is also called ultrawideband signal, which has a broad application prospect in radar detection and electronic countermeasures and other fields. In this paper, an acquisition device is proposed to obtain the USP signal with ultrahigh compression efficiency (CE) and ultrahigh power compression gain (PCG). The long input pulse with a time length of μs level can be compressed to a narrow pulse with a pulse width of 450 ps level (2.6–3.9 GHz) by using the proposed USP acquisition device. Under the condition without loss, the CE of the USP acquisition device can reach up to 98% according to the simulated results. In the simulation, if the material of the acquisition device is set to copper material, then the CE has some reduction due to conductor loss. In order to demonstrate the effectiveness of the proposed USP acquisition device, a USP acquisition device is established and measured. According to the measurement results, a measured PCG of 27 dB is achieved and the pulse width is approximately 460 ps. The peak power of the output USP signal reaches to 100 kW under the condition of input pulse with a power of 200 W.
In order to realize integrally analysis and optimization of the large airborne radome-enclosed antenna system, a novel optimization strategy is proposed based on an overlapping domain decomposition method by using higher-order MoM and out-of-core solver (HO-OC-DDM), and combining with adaptive mutation particle swarm optimization (AMPSO). The introduction of parallel out-of-core solver and DDM can effectively break the random access memory (RAM) limit. This strategy can decompose difficult-to-solve global
optimization problems into multi-domain optimization problems by using domain decomposition method. Finally, take airborne Yagi antenna system as an example, the numerical results show that the design of large airborne radome-enclosed antenna system based on the proposed strategy is convenient and effective.
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