Radio Detection and Ranging are used for object detection, distance and altitude measurement, and mapping. RADAR can be used in bad weather conditions and can see objects under the sea and in the air at great distances. Ship radar is one of the technologies in the shipping sector, especially in the marine sector navigation system. For that, we need an antenna that has a compact design, small size, wide bandwidth, and can be used to meet the operating frequency of the radar system. Microstrip antenna is a type of antenna that is currently widely used in several devices as an alternative because the manufacturing process is simple and inexpensive. Ordinary microstrip antennas work on one frequency (single band). By using DMS (Defected Microstrip Structures) the antenna can work in multiband. Therefore, the author tries to design a Multiband antenna using DMS for marine radar which is known to operate at the S-band (3 GHz) frequency, following the specifications of the radar antenna. The substrate used is FR-4. This research method uses CST 2019 simulation as simulation software.The simulation results at a frequency of 3.0046 GHz show a VSWR of 1.0764 and a return loss of −27.9 dB. From the simulation results, we can analyze that to get the characteristics of the antenna according to the desired specifications, namely working at a frequency of 3 GHz, VSWR 2, and Return Loss −10.
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