A wireless power beaming system using Y shaped reflectarray and rectenna achieving 8.33% power transfer efficiency.

Area of Science:

• Electrical Engineering
• Electromagnetics
• Wireless Communication

Background:

• Wireless Power Transfer (WPT) systems are crucial for modern electronics, but often face limitations in efficiency and range.
• Reflectarray antennas offer beam-forming capabilities, but UWB and high-gain implementations in WPT are challenging.

Purpose of the Study:

• To design and implement a novel wireless power transfer system utilizing an ultrawideband (UWB) circularly polarized multilayer reflectarray antenna (RA).
• To demonstrate the first distributed transmitter (TX) configuration for UWB WPT, aiming for enhanced efficiency and versatility.
• To optimize transmitter spacing for simultaneous collimated beam generation in a multi-TX WPT system.

Main Methods:

• Design of novel 'Y'-shaped unit cells with a rectangular middle layer for the multilayer reflectarray antenna.
• Integration of a horn antenna as a feed for the UWB reflectarray operating from 5 to 10 GHz.
• Optimization of transmitter spacing in a distributed WPT system to achieve a focused power beam.

Main Results:

• The reflectarray antenna achieved a peak realized gain of 21.261 dBi with a 3 dB gain bandwidth (BW) of 18.2%.
• A significant 3 dB axial ratio (AR) BW of 63.11% was obtained for transmit antenna (TA) operation.
• Power Transfer Efficiency reached 5.03% (1 TX), 8.33% (2 TXs), and 8.11% (3 TXs) at 1.7 m distance.

Conclusions:

• The proposed UWB circularly polarized multilayer reflectarray antenna enables efficient beam formation for WPT.
• The distributed transmitter configuration enhances the efficiency and versatility of UWB wireless power transfer.
• This system shows significant promise as a candidate for efficient long-distance wireless power beaming applications.