The present invention relates to a multi-U- slot microstrip patch antenna, and a ground substrate; Forward U- slot and two reverse U- slot is formed with a patch (Patch) arranged respectively in the forward-U- slot at both ends; Coupled with the dielectric substrate is laminated between the ground and patch; The outer conductor is grounded to the substrate, the inner conductor comprises a coaxial line which is connected to each of the patch receiving the signal of a specific frequency band at the same time supplying the signal to the patch, wherein the forward and two reverse U- slot depth of the U- slot, the length and the reflection coefficient according to the change in position thereof, the reflection coefficient according to the position change of the coaxial line, the antenna of 5.15 ~ 5.35GHz frequency band required by the present invention by measuring the reflection coefficient according to the thickness of the dielectric obtaining the optimized parameters that can be obtained can be obtained operable multi-U- slot microstrip patch antenna in 5.15 ~ 5.35GHz band plan to new in the International Telecommunication Union (ITU) by applying it.
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