High peak power UWB-RFID transmitter tag for long range applications

In this paper, a high-voltage and high-efficiency UWB-RFID transmitter MMIC is presented. It is targeted for precision localization and tracking of mobile objects in wireless sensor networks within a cluttered indoor environment. The proposed pulse generator MMIC has a peak output power of 24.15 dBm, with 1.2 mW power consumption at 1 MHz pulse repetition frequency and an efficiency of 18.4%. The high output voltage is achieved by overcoming the breakdown phenomena of the transistor by using cascode transistor pair. The 2 μm GaAs HBT process is used for fabrication of the proposed MMIC. The power spectrum of the generated pulse fully utilizes the FCC peak power limit spectrum mask. The generated UWB pulse is centered at 4.25 GHz with apeak-to-peak amplitude of 10.2 V fora 50-ohm load and has a full width at half maxima of 0.85 nsec.