Miniaturized Broadband Bi-Yagi Antenna Array for Ambient RF Energy Harvesting

Area of Science:

• Electromagnetics and Antenna Engineering
• Wireless Communication Systems

Background:

• Miniaturized antennas are crucial for mobile devices.
• Broadband antennas are needed for diverse wireless applications like Wi-Fi.
• Achieving high gain and efficiency in small antennas presents a significant challenge.

Purpose of the Study:

• To design and validate a miniaturized broadband Bi-Yagi antenna array.
• To optimize antenna parameters for a balance between bandwidth, effective area, gain, and physical dimensions.
• To enable efficient electromagnetic wave capture for mobile wireless and Wi-Fi.

Main Methods:

• Investigated coupling between radiator and director elements to enhance bandwidth.
• Optimized element spacing and dimensions for performance metrics.
• Fabricated and experimentally validated the antenna's reflection coefficients, impedance, gain, and radiation patterns.

Main Results:

• Achieved a bandwidth of 1.79 GHz to 2.56 GHz.
• Demonstrated gains ranging from 6.2 dBi to 9.34 dBi.
• Reported total efficiency between 88% and 98% with dimensions of 138.6 mm × 47.7 mm × 1.57 mm.

Conclusions:

• The proposed miniaturized Bi-Yagi antenna array effectively balances key performance parameters.
• The design is suitable for applications requiring efficient electromagnetic wave harvesting.
• Experimental validation confirms the antenna's viability for mobile wireless and Wi-Fi systems.