Efficient Near-Field Beamforming Using Two-Layer Planar Loop Array for Magnetic Resonance Wireless Power Transfer
- Authors
- Nam, Yong-Hyun; Lee, Jeong-Hae
- Issue Date
- Aug-2020
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Beamforming; magnetic resonance wireless power transfer (MR WPT); spatial position and alignment freedom
- Citation
- IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS, v.30, no.8, pp.818 - 820
- Journal Title
- IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
- Volume
- 30
- Number
- 8
- Start Page
- 818
- End Page
- 820
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/11620
- DOI
- 10.1109/LMWC.2020.3000768
- ISSN
- 1531-1309
- Abstract
- This letter presents efficient near-field beamforming using two-layer planar loop array resonator for magnetic resonance wireless power transfer (MR WPT). This two-layer structure provides enhanced power transfer efficiency (PTE) of two important functions by adjusting the lumped capacitance of each loop: beamforming and ability of spatial position freedom and spatial alignment freedom with the receiver. The optimal capacitance of each loop can be found using a genetic algorithm (GA). The three types of two-layer loop arrays such as 1x1 and 4x4, 2x2 and 4x4, and 4x4 and 4x4 are designed at an operating frequency of 6.78 MHz. Overall, these two-layer loop arrays improve the overall simulated PTE compared with that of the 4 x 4 single-layer loop array. Especially, the two-layer loop array of 2 x 2 and 4x4 provides the most improved beamforming performance and spatial freedom among them. The measured PTE also increases by about 10% compared with that of the 4 x 4 single-layer loop array.
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