Abstract
This paper proposed a broadband, high-gain antipodal Vivaldi antenna for 2.45 GHz and 5.8 GHz wireless power transmission systems. The proposed antenna consists of a radiator with two flares and diagonal slots which are inserted at the edges of the radiator to improve the bore-sight gain. The diagonal slots reduce radiation gain in undesired directions, thus enhancing the bore-sight gain by 4.1 dB at 2.45 GHz. The directors between two upper flares concentrate the E-field, resulting in increased bore-sight gain at 5.8 GHz. The performance of the proposed antenna is measured in a full anechoic chamber, and it is confirmed that reflection coefficients are less than −10 dB in ISM bands, with bore-sight gains of 8.31 dBi and 13.1 dBi at 2.45 GHz and 5.8 GHz, respectively.
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