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Design of a frequency selective structure with inhomogeneous substrates as a thermophotovoltaic filter

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3 Author(s)
G. Kiziltas ; Univ. of Michigan, Ann Arbor, MI, USA ; J. L. Volakis ; N. Kikuchi

In this paper, the design of a thermophotovoltaic (TPV) filter with high-pass characteristics is presented. The filter is in the form of a frequency selective structure (FSS) with cascaded inhomogeneous dielectric substrates. The goal is to allow for more design flexibility using dielectric periodic structures to deliver a sharper filter response. Therefore, the primary focus is to design a periodic material substrate composition (supporting FSS elements) using a topology optimization technique known as the density method. The design problem is formulated as a general nonlinear optimization problem and sequential linear programming is used to solve the optimization problem with the sensitivity analysis based on the adjoint variable method for complex variables. A key aspect of the proposed design method is the integration of optimization tools with a fast simulator based on the finite element-boundary integral method. The capability of the design method is demonstrated by designing the material distribution for a TPV filter subject to pre-specified bandwidth and compactness criteria.

Published in:

IEEE Transactions on Antennas and Propagation  (Volume:53 ,  Issue: 7 )