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One pattern of patch antenna with the function of reconfiguration is presented. This antenna is composed of one rectangle patch and two U-shape patches .They can be connected by RF MEMS (micro electromechanical systems for RF circuits) switches. By controlling the states of these RF MEMS switches, the antenna can radiate four patterns .The four patterns have the same operating frequency at 35GHz. Ansoft HFSS provides the simulation results. This antenna can be used in radar, satellite, security communications and so on. Keywordspattern reconfigurable; ka band; RF-MEMS; Microstrip patch antenna

A Design of Antenna with Pattern Reconfigurable Characteristic Working on Ka band