Abstract: A plurality of piezoelectric or magnetostrictive rectangular planar staves are held in side-by-side relation in a laminate assembly including insulative spacers. The widthwise polarity of adjacent pairs of the staves are inverted relative to each other. The acoustic centers of the staves are spaced apart a distance of approximately one-half of a wavelength of the operating frequency. Electrical connections are made to the opposite side edges of each of the staves through leads and bus wires. The array of staves define an active planar acoustic face for simultaneously sending and simultaneously receiving a pair of angularly separated beams of acoustic energy without electronically phasing or time delaying the signals transmitted to and from the individual staves and without mechanically rotating the array.