5A-5 64 Ã\x97 64 2-D Array Transducer with Row-Column Addressing

We present experimental results from a prototype 5 MHz, 64 times 64 (4096 elements, 16 mm times 16 mm) 2D array transducer with row-column addressing. The main benefits of our design are a reduced number of interconnects, a T/R switching scheme with a simple diode circuit, and an ability to perform transmit and receive beamforming. With transmit beamforming in elevational direction and receive beamforming in azimuth direction, it is possible to perform 3D imaging of targets near the transducer. The series resonant impedance was measured at 120 Ohms near 5.5 MHz. The spectrum of the pulse has a center frequency of 5.6 MHz and a -6 dB fractional bandwidth of 43%. In azimuth direction with receive beamforming, we measured the -6 dB width to be 1.22 mm at a depth of 55 mm compared to a theoretical beamwidth of 0.91 mm. In elevational direction with transmit beamforming, -6 dB width was 0.92 mm at a depth of 27 mm compared to a theoretical beamwidth of 0.45 mm. Finally, we introduce results from 266 times 266 2D array transducer