| To facilitate passengers positioning and monitoring their luggage independently at travel, and addressing the problem of complex structure, large power consumption and size, along with the difficulty in directly determining the relative position between passengers and baggages for the existing GPS and GSM/GPRS positioning and monitoring systems, a new system should fully address the above issues, while meeting the requirements of positioning and monitoring.Adopting passive location technology, on the stand of design of RF front-end in physical layer transmitter, to achieve a simple, low-power and miniature-size positioning monitoring system, it's necessary to take account of choosing the structure of the transmitter RF front-end, indicator assignment, chip selection, module design and PCB design factor, which is also the goal of this dissertation.Firstly, this paper makes a comparative analysis for the common structures of the transmitter RF front-end, and chooses a stratage with simple structure, fewer signal processing blocks, which facilitates to obtain miniaturizd design. Then, for the goal of miniaturization and achieving satisfactary performance, the transmitter RF front-end system is designed with the criterion of small size, high integration, and fewer external components. And following, with the principle of streamlining peripheral circuits or using alternative reactor components microstrip line, the function modules of the transmitter RF front-end is designed to further reduce the number of external components. The small radio transmitter front-end 2.4G system implementation is eventually completed with compact layout. Finally, the performance and consistency testing were carried out.The above results provide a compact RF front-end 2.4G transmitter design structure, which is a scheme with stable performance, high consistency, and suitability for plentiful production, and achieves the goal of simple structure, low power consumption, and small size. |
PDF Full Text Request