volume | PIER Journals

Abstract

This paper proposes a dual-beam switchable self-oscillating active integrated array antenna for Ku-band wireless power transfer systems. The oscillation is sourced by a positive feedback type Push-Push oscillator, which shows an excellent measured output power of +9.3 dBm obtained at the second harmonic frequency as well as good suppression of the undesired harmonics. The generated RF power from the oscillator excites four patch antenna elements. Moreover, a PSK modulator is adopted for binary phase switching between 0˚ and 180˚. Using in/anti-phase RF signal combination of the antenna elements, it is possible to switch between two beams, sum and difference radiation patterns. The proposed structure is fabricated and tested; the measured results verify the dual-beam switching concept with an effective isotropic radiated power (EIRP) of +17.77 dBm, DC-to-RF efficiency of 0.43%, and an oscillator figure of merit (FOM) of -158.05 dBc/Hz at the second harmonic frequency of 14.7 GHz.

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Mr. Maodudul Hasan

Dr. Eisuke Nishiyama

Dr. Takayuki Tanaka

Dr. Ichihiko Toyoda