Real time weather monitoring in aircraft is gaining its importance in emerging IoT applications. Here a compact microstrip rectangular patch antenna with different slots have been proposed. The slots are introduced to reduce the resonating frequency and to obtain miniaturization of antenna. Here a microstrip patch antenna is developed with resonating frequency in the range of S band. Slots of various shapes are introduced to shift the resonating frequency range to L band. By this we achieve reduction in size of antenna. The antenna uses inset feeding techniques and substrate used is FR4 epoxy. Microstrip patch antenna is simulated by HFSS software. © 2017 IEEE.