Discipline: Technology and Engineering
Subcategory: Electrical Engineering
Room: Exhibit Hall A
Steven Pringle ll - Norfolk State University
Wireless Power Transmission (WPT) is the transmission of electrical energy without the use of wires from one point to another over extended distances. This can then be applied to systems such as space travel, biomedical devices inside the human body, and wirelessly powering vehicles. The purpose of this experiment is to study the transmittance of microwave energy using rectenna arrays for energy transfer over extended distances. In order to accomplish this a dipole rectifying antenna and its array must be designed and analyzed, A simulation of the dipole rectenna must be run using the ANSYS HFSS program, a characterization of irradiance from a microwave amplifier based on the distance in an Anechoic chamber must be acquired , and the principals of WPT must be applied to a real system for power transmission. In order to acquire data for the irradiance a probe was placed in front of a horn located inside the anechoic chamber, which caught microwaves shot out from the horn and gave a measurement for irradiance. The frequency of the microwaves was then adjusted from a range of 7 GHz to 12 GHz with a .5 GHz step. The probe would then be relocated 10 inches back and the process is repeated to acquire the irradiance values for varying distances. To acquire voltage and current the rectenna array is put in front of the horn, so that it can collect the electromagnetic waves and is then connected to a multimeter. As the frequency for the microwaves is varied again from a range of 7 GHz to 12 GHz with a .5 GHz step and shot at the rectenna in the Anechoic chamber the resulting voltage and current are recorded. To test a real system the rectenna array was simply disconnected from the multimeter and connected to an LED light bulb. Results show that as expected irradiance increases proportionally with distance and frequency. The rectenna was also estimated to run most efficiently at a frequency of 7.5 GHz resulting in 31% efficiency. In the end however the experiment successfully ended with wirelessly transferring power to an LED color changing light that required 1.5 Volts to run. For future works different materials and other outside factors can be incorporated within the experiment to see how they effect the efficiency of the process.
Funder Acknowledgement(s): NSF CREST Cream; STARS
Faculty Advisor: Kyo Song, firstname.lastname@example.org
Role: I analyzed a dipole rectenna and its array, simulated the dipole rectenna by ANSYS HFSS, acquired a characterization of irradiance from a microwave amplifier based on a set distance in an anechoic chamber and applied wireless power transmission (WPT) to a real system for power transmission.