A mmWave Leaky-Wave Antenna for Efficiency Enhanced Near-Field Wireless Power Transfer and Communication

A mmWave near-field-focused and beam steerable circularly polarized (CP) leaky-wave antenna (LWA) for wire-lesses power transfer (WPT) with multiple users and communication is presented. The proposed design is achieved by etching uniform fan-shaped slots in a rectangular substrate integrated waveguide (SIW). The slots are elaborately designed and positioned for beam focusing at a desired focal distance of 0.5 m. Compared to the conventional LWA, the power density of the proposed design is enhanced by 1.4 dB. It allows a dual beam scanning propriety with a wide angular coverage of -43.18° and -33° in near field and far field, respectively. The proposed design benefits WPT systems by eliminating the beam forming network and offering wide power coverage. Moreover, it offers high realized gain no less than 12.62 dBi in the bandwidth of 22.5 GHz to 26 GHz. Hence, the LWA proposed is a promising transmitter candidate for integrated WPT and communication.