High Aperture Efficiency Array Antenna for Wireless Power Transfer Applications

Eunjung Kang, Jun Hur, Chulhun Seo, Hojin Lee and Hosung Choo
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Eunjung Kang: School of Electronic and Electrical Engineering, Hongik University, Seoul 04066, Korea
Jun Hur: School of Electronic and Electrical Engineering, Hongik University, Seoul 04066, Korea
Chulhun Seo: School of Electronic Engineering, Soongsil University, Seoul 06978, Korea
Hojin Lee: School of Electronic Engineering, Soongsil University, Seoul 06978, Korea
Hosung Choo: School of Electronic and Electrical Engineering, Hongik University, Seoul 04066, Korea

Energies, 2020, vol. 13, issue 9, 1-15

Abstract: We propose a novel array antenna with high aperture efficiency by employing an array element operating in a high-order mode to improve the transmission efficiency of wireless power transmission applications. The proposed array element, operating at a frequency of 5.8 GHz, consists of a square patch with four metallic shorting pins, an extended cavity, and a high dielectric superstrate. The four metallic shorting pins derive the high-order operation, which can enhance the bore-sight gain, resulting in the high aperture efficiency of the array. The extended cavity structure can help further improvement the aperture efficiency and minimize the mutual coupling strength between adjacent elements. The proposed antenna element is extended to 2 × 2 and 4 × 4 arrays, resulting in aperture efficiencies of 74.2% and 80.5%, respectively. For the 2 × 2 array, maximum measured gains of 19.9 dBi in the zx -plane and 18.8 dBi in the zy -plane are observed. For the 4 × 4 array, the maximum measured gains of 24.3 dBi in the zx -plane and 24.5 dBi in the zy -plane are obtained in a full-anechoic chamber. Finally, the transmission efficiency of 6% with a distance of 0.8 m between the transmitter (Tx) and the receiver (Rx) is measured when setting up the wireless power transfer system, which consists of the Tx with the proposed 4 × 4 array and the Rx with a single element.

Keywords: high order; high gain; gain enhancement; aperture efficiency; wireless power transfer; MPT (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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