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With a change in phased-array configuration from one dimension to two, the electrical impedance of the array elements is substantially increased because of their decreased width (w)-to-thickness (t) ratio. The most common way to compensate for this impedance increase is to employ electrical matching circuits at a high cost of fabrication complexity and effort. In this paper, we introduce a multilayer...
Diagnostic and high intensity focused ultrasound (HIFU) phased-arrays provide many advantages over single element transducers, including dynamic focal beam steering capability. These arrays should be fabricated with element-to-element pitch smaller than half the wavelength at the resonance frequency to avoid unwanted secondary foci due to grating lobes and side lobes. However, smaller pitch increases...
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