engleski

Analysis of Spherical Arrays of Microstrip Antennas Using Moment Method in Spectral Domain

Arrays of rectangular single and stacked-patch antennas embedded in a multilayer spherical structure are analysed using the spectral-domain approach and the moment method. The patch current is transformed to the spectral domain using the vector-Legendre transformation, which simplifies the analysis procedure since the electromagnetic field excited by one spectral source component has the same angular variation as the source. In order to avoid numerical difficulties appearing when analysing structures with large radius, a modified vector-Legendre transformation and normalized Legendre functions are defined and applied to the solution procedure. Furthermore, the asymptotic formulas for the field distribution of higher order spectral modes are implemented into the algorithm for calculating Green’ s functions. The effect of deviation from the spherical symmetry and the influence of the structure radius on self and mutual impedance are studied. A laboratory model is built to test different configurations of spherical patch antennas and to validate the developed program.

spherical antennas; conformal antennas; microstrip antennas; method of moments

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