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We present a three-dimensional far-field imaging method using an air-coupled 40 kHz 8×8 ultrasound phasedarray. A waveguide is attached to the array which reduces the aperture to 35 mm×35 mm and the inter-element spacing to λ /2 for grating lobe free beamforming. Using transmit beamforming, a pulse echo detection is performed sequentially for each direction of the discretized region of interest. All transducers are used for pulse transmission and echo reception. The echo signals are FIRdoi:10.18154/rwth-conv-238964 fatcat:x6blvgouwnhwxeafkaoddqrndm