Analysis of Impact of Circular Cut on Microstrip Patch Antenna at 2.49 GHz for S Band Application Mitchell S. Prajapati, Abhishek Rawat, Ravi Parikh and Priyank Joshi Abstract In this paper, the impact of circular cut on the geometry of microstrip patch antenna is analyzed. Initially, the geometry of microstrip antenna is prepared for the 2.49 GHz central frequency with the bandwidth of 50.4 MHz which is one of the operational bands of IRNSS receiver. In this band, it provides very low return loss and RHCP around 2.0 which is suitable for IRNSS receiver second band of operation 2.49 GHz. This antenna is fed by coaxial probe with proper impedance matching. Different circular cuts alter the key properties of this antenna. So, the comparative analysis is done by changing the radius of cuts at two diagonal angles at patch geometry to analyze the variation in important parameters of microstrip patch antenna. Keywords Microstrip patch antenna · Ansoft HFSS 15 1 Introduction Microstrip patch antenna is widely used in wireless communication application due to its several advantages as it is small in size, low in weight, easy to design, fabricate and install, and low in cost. In this paper, microstrip patch antenna is designed for S band from 2.4654 to 2.5158 GHz. This microstrip patch antenna can be used for satellite communication, amateur radio, amateur satellite, amateur television, and wireless networking applications. The IRNSS is the Indian Regional Navigation Satellite System. It is an indepen- dently developed navigation system established and controlled by the Indian Space Research Organization (ISRO). IRNSS receiver is capable of receiving standard positioning service signal at L5 and S band frequency. Microstrip patch antenna can have different shapes of patch according to design and appropriate applications. A M. S. Prajapati (B ) · A. Rawat · R. Parikh · P. Joshi Institute of Infrastructure Technology Research and Management, Ahmedabad, India e-mail: mishelprajapati@gmail.com © Springer Nature Singapore Pte Ltd. 2019 V. Nath and J. K. Mandal (eds.), Proceedings of the Third International Conference on Microelectronics, Computing and Communication Systems, Lecture Notes in Electrical Engineering 556, https://doi.org/10.1007/978-981-13-7091-5_41 505