This paper presents the design and optimization of a high-efficiency rectifier for radio frequency (RF)- energy harvesting (EH) applications operating at 0.9 GHz, targeting low-power wireless sensor and IoT systems. The proposed architecture employs a high-pass T-matching network integrated with a voltage doubler topology utilizing the HSMS-2852 Schottky diode. The design is implemented and analyzed using Advanced Design System (ADS) through S-parameter and Harmonic Balance simulations to ensure an accurate nonlinear performance evaluation. All critical parameters, including the matching network components, the rectification stage, the DC- pass filter, and the load resistance, are carefully optimized to maximize the RF-to-DC conversion efficiency and output voltage. The rectifier achieves a peak conversion efficiency of 55.122% at 0.9 GHz with an input power of 0 dBm and a 6 kΩ load, producing a DC output voltage of 2 V. Furthermore, the proposed design demonstrates an impedance bandwidth −10 dB of 150 MHz centered at 0.9 GHz, ensuring stable operation under frequency variations. Compared with recently reported rectifiers, the proposed circuit achieves improved efficiency while maintaining compact size and design simplicity on Rogers RO3003 substrate, making it suitable for integration into compact wireless power transfer and ambient RF harvesting systems.