An alternative radiation stabilization method has been presented for patch antenna. With this method, side radiation could be\nsuppressed when a conductor ring and a circular slot both with the width of a quarter-wavelength are placed on the same layer\nand around patch antenna. An experimental structure has been simulated and the distance ???? from antenna part to conductor ring\nis optimized using parametric function of HFSS software.Measured results given in this paper obviously indicate that not only the\nside radiation fromthe boundary of substrate could be suppressed effectively, but also the antenna directivity could be adjusted and\nenhanced after this method has been carried out. Both simulation and measurement indicate that when the distance ???? is set to one\nguided wavelength (????????), side radiation could be suppressed the most effectively and the return loss of patch antenna is only slightly\naffected.
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