The design of the rectifier circuits is performed by Advanced Design System (ADS 2016) software and the RF-DC conversion efficiency and output voltage were simulated and the max output voltage of rectifier at 0dBm was 5.8V.
On the second design Taper matching technique was used to match the complex input impedance of the rectifier circuit to the standard 50 Ω. Many matching techniques were used in the design, the first design included T-Lumped element matching network used for single band and multi-band rectifiers by using Advanced Design System (ADS 2016) and Smith Ver3 software. Rectifier circuits with four-stage voltage doubler using Schottky diodes were designed to convert the RF energy into a DC output. Next, rectifier circuits are proposed for RF to DC conversion and obtaining high voltage output. The antenna has been fabricated and tested and the measurements were in acceptable agreement with simulations but with some shift in frequency. The design and optimizing of the performance of proposed antenna are performed by using Computer Simulation Technology software CST studio design and ANSYS HFSS 15 software. The designed antenna has good return loss performance. Microstrip Ultra-wideband star patch antenna was designed to harvest multi-band signals including 900MHz (GSM band) Global System for Mobile communication ,1800MHz (GSM band), UMTS (3G Band) Universal Mobile Telecommunications System and WiFi (Wireless Fidelity) frequencies bands. This thesis presents design of multi-Band RF energy harvesting system which consists of three main blocks connected together, rectenna (antenna, rectifier circuit) and matching circuit. It has also become one of the most research topics in the world because of its importance in providing easy and free energy for important applications that are not easily accessible. Energy harvesting technology has received a lot of attention at a time of great proliferation in the use of wireless devices.
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