An Efficient Radiation Analysis Method for Large-Scale Finite Periodic Array Antenna

In this letter, an efficient radiation analysis method for large-scale finite periodic array antenna is proposed. This method is based on finite element domain decomposition and leverages the periodicity of array antenna elements to achieve memory reduction through subdomain matrix reuse. Meanwhile, a matrix preconditioner tailored for finite element domain decomposition is further employed, and an equivalent boundary method is adopted to simplify the computational complexity of multilayer thin-sheet dielectric structures. Subsequently, a far-field equivalence computation method is employed, which directly derives the far-field distribution of large-scale arrays by solving small-scale array problems, thereby significantly lowering the complexity of radiation analysis in large-scale antenna arrays. This method enables computationally efficient radiation analysis of large-scale arrays, even with thousands of elements, significantly reducing processing time and resource demands.