Abstract: A near-field-focused (NFF) microstrip array antenna is designed. The operation frequency is at S band 2. 45GHz and feed mode adopts the coaxial line. The NFF circular array antenna which is made of two ring of microstrip an tenna arranged in a dielectric substrate by controlling the distance between two rings to make the focus distance of a wave length to achieve focus. At the same time, in order to ensure the microstrip antenna have only one focal spot , which requires the distance of two ring radius is less than two wavelengths. We use Ansoft HFSS and CST to simulate and optimize the model of the NFF array antenna. The result show that the ring array can focuse well to reduce the distance of the rings,increase the number of the rings,the focused spot get small.