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Mutual Coupling Analysis of Cylindrical Waveguide Arrays Using Hybrid SD-UTD Method

One way of analyzing conformal arrays is to use the separation of variables and express the solution in a modal or harmonic series expression. The two biggest disadvantages of the spectral approach are in summation of high number of terms in the Fourier series for structures with large radius, and in evaluating highly oscillating integrals when the source and observation points are separated in the direction for which the structure is planar. There are a lot of techniques to accelerate the inverse Fourier transformation/series. Here we will describe the hybrid spectral domain - uniform theory of diffraction (SD-UTD) technique for reducing the needed number of terms in the Fourier series and the needed length of integration in the Fourier transformation. The basic idea is to subtract the asymptotic part of the Green’ s function, and to calculate the asymptotic part using uniform theory of diffraction (UTD).

hybrid methods; conformal antennas; moment method; diffraction theory; waveguide antennas

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