Ultrawideband Tightly Coupled Dipole Rectenna Array for Wireless Power Transfer (WPT)

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Abstract
This letter proposes an ultrawideband tightly coupled dipole rectenna array (TCDRA) for wireless power transfer (WPT). Compared to conventional designs of the same aperture area, the tightly coupled dipole array (TCDA) exhibits enhanced radiation efficiency and bandwidth, showing strong potential for WPT systems. Operating from 1 to 10 GHz, the proposed array employs a feeding structure combining a T‐junction and tapered baluns, which simplifies the design, ensures ultrawideband impedance matching, and reduces the need for subsequent power combining. The wide‐angle matching layer and resistive frequency selective surface (RFSS) are jointly optimized to minimize the RFSS impact on antenna efficiency. The ultrawideband rectifier, using a voltage‐doubling topology and an L‐type matching network, achieves a power conversion efficiency (PCE) above 50% from 0.03 to 10.37 GHz. A WPT system is built and tested at 1, 2.4, and 5.8 GHz, confirming that the proposed rectenna efficiently receives and converts RF energy over a wide frequency range, demonstrating suitability for diverse scenarios and complex electromagnetic environments.
Funding Information
  • National Natural Science Foundation of China (62271122)
  • National Natural Science Foundation of China (62401105)

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