In this thesis, work regarding to development a system that would help finding
lost objects based on RSSI is presented. The thesis gives a basic overview of the
theory behind RF modulation, antennas and PCB design. Based on the presented
theory, the technology and system parameters are chosen to design and ultimately
complete the system. To improve the performace of the system the RF parts of
the circuits are optimized using a vector network analyzer.
As a result of this thesis a periodically transmitting battery-powered beacon that
works at 433.92MHz is designed and completed. To read the transmitted data and
the signal strength a receiver is also designed and completed to receive the data
transmitted by the beacon and display the RSSI on a smart-phone screen using
the micro-USB port
