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This paper proposes a novel technique that exploits a circuit-based coarse model and the adaptive adjustment of the design specifications. Original design specifications are modified to take into account the difference between the fine and coarse model responses at the current design. The coarse model is then optimized with respect to the modified specifications to produce a new design that-assuming sufficient quality of the coarse model-gives a good prediction of the optimal fine model design with respect to the original specifications. The new method is extremely simple to implement, and, as demonstrated using several examples, it is able to yield a good design after one or two electromagnetic simulations.