Abstract: The increase in production of oranges has led to numerous studies; some investigate the nutrients inside the fruit while some investigate the benefits of orange. Nevertheless the purpose of prior studies is similar which is to determine the quality attributes of the fruit. The process can be done destructively and non-destructively. This study focuses on microwave sensing as a method in determine the soluble solid content. It is first done by simulation of the modelling which consists of a nylon bowl, Teflon, connector and antenna in which the number of monopole ground is the manipulative variable. The results of this simulation emphasize on the reflection coefficient, S11. The most number of monopole has higher S11 which has higher reflected power.