Optimised Design of a Printed Elliptical Spiral Antenna with a Dielectric Superstrate
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Optimised Design of a Printed Elliptical Spiral Antenna with a Dielectric SuperstrateAbstract
An elliptical spiral antenna embedded between a grounded dielectric substrate and superstrate is designed using a curved segment moment method employing complex images, which is driven by a marginal distribution optimisation algorithm. The spiral parameters together with substrate and superstrate permittivity and thickness values are optimised for low axial ratio and maximum gain and bandwidth. It is shown that the superstrate improves the bandwidth of the spiral.
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