paper 150120230722

Abstract

The hybrid finite element-boundary integral-multilevel fast multipole algorithm (FE-BI-MLFMA) approach is adopted for fast and accurate computation of radiation from large slotted-waveguide antenna arrays. A simplified model is presented by using a thin current probe as the excitation and a layer of perfectly matched layer (PML) as the termination for slotted- waveguide antenna. Since each slotted-waveguide antenna can be generally considered as a single sub-domain, the domain decomposition algorithm (DDA) is applied in the FE-BI-MLFMA to re- duce computation resource and achieve high efficiency. This DDA-FE-BI-MLMFA is parallelized to further strength its capability. To validate the presented approach for computing radiation from slotted-waveguide antenna arrays, a series of numerical experiments are performed. Good agreement between our calculated results and results from commercial software CST validates accuracy of the presented approach. To show capability of the proposed DDA-FE-BI-MLFMA, a large X-band slotted-waveguide antenna array containing eighteen waveguides is designed and its radiation characteristics are studied.

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Xin-Qing Sheng

Xu-Min Sun

Ming-Lin Yang