Coastal Suveillance Radar (CSR) is crucial for coastal navigation. A microstrip rectangular patch with slotted inset-line antenna is proposed in this paper. The antenna operates at the frequency 9.37-9.43 GHz with VSWR below 1.3 and printed on Epoxy FR-4 substrate of dielectric constant of 4.6. The antenna array is also simulated on CST using uniform microstip array configuration consisting of 6Ã—120 elements to yield the specification of horizontal beamwidth â‰¤ 1â—¦, vertical beamwidth â‰¤20â—¦, gain â‰¥30 dB and sidelobe level â‰¤ âˆ’27 dB. The simulation result of the array antenna has a horizontal beamwidth of 0.4â—¦, vertical beamwidth of 14.2â—¦, gain of 30.8 dB, and sidelobe level of âˆ’27.5 dB. Hence the proposed array antenna configuration is suitable for CSR application.