Abstract
A spatially phased transducer array has been developed and tested that can form a steered beam without the need for electronically applying phase shifts to an array of elements. In its simplest form, the transducer consists of two channels from spatially shaped cosine and sine apertures, where the sine channel is shifted 90 degrees and then combined with the cosine channel. The transducer produces a beam steered to a desired angle at a specific design frequency in either receive or transmit operation. Several have been fabricated and tested using low-lateral mode transducer materials such as polyvinylidene flouride (PVDF) and 1-3 PZT composite, and electroplated electrodes to form the cosine and sine apertures. The appearance of the electrode has led to calling this a ‘‘doily’’ transducer array. Beams were formed that were steered as far as 54 degrees with typical sidelobe levels of −20 dB. The apertures were also geometrically shaped to supress sidelobes along the steering axis. [This work was supported by Kam Ng of ONR.]
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