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This study proposes a microstrip patch antenna to detect salinity and sugar content in water. The microstrip antenna is a low‐cost and low‐profile antenna which is modeled to transmit and receive an electromagnetic signal. The proposed antenna consists of a circulated Psi‐shaped patch and slotted partial ground plane. The antenna is impersonated on Rogers RT/duroid 5880 material with a thickness of 1.57 mm having a relative permittivity of 2.2. The antenna has a compact dimension of 24 × 18 mm. The High‐Frequency Structural Simulator is used to simulate and analyze the proposed antenna. The antenna is used as a sensor to detect the salinity and sugar in water in terms of the reflection coefficient. The percentage of salt and sugar in water changes the dielectric properties of the solution and consequently the reflection coefficients also change. The results during the practical observations show that the …