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A multi-channel phased signal generator with robust and extensible automatic synchronization network is presented in this work to meet the ever increasing demand for the mixed signal based active antenna array. The proposed generator architecture possesses high flexibility of building up the scalable active antenna system and is validated by the experimental results of a prototype. Furthermore, its...
When a radome is electrically large and smooth (does not have sharp tips and edges), the high frequency method (PO and GTD) can be applied to predict reasonably accurate results. However, in real world problems, a radome is often constructed to have electrically small features and geometry discontinuities which cause reduced prediction accuracy by high frequency methods. In this case, the hybrid approach...
In the calculation of the radiation patterns of antennas installed on complex structures using iterative solvers, the convergence rate is often slower compared to the problem with the structure alone without antenna. This is due to the resonant nature of the antenna. To increase the convergence rate, a resonant extraction method is introduced by which a small region including the antenna and its nearby...
In this paper, a preconditioner in the implementation of the hybrid volume and surface integral equations (VSIE) with MLFMA solver is described. The algorithm is applied to the calculation of radiation pattern of a microstrip antenna residing in a large open-ended cavity. The numerical results show that the method can substantially reduce the iteration number with CG method. Using this preconditioner...
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