Abstract: Wireless power transfer between an array of antennas and a single-antenna terminal is governed by matrix circuit theory. A complex-valued, non-conjugate symmetric impedance matrix ...

Abstract: An ultrasound sparse array consists of a sparse distribution of elements over a 2-D aperture. Such an array is typically characterized by a limited number of elements, which in most cases is ...

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The alien-like machines, described as ‘legged metamachines’, are built from autonomous modules that can be snapped together in a variety of forms. Researchers say the approach could lead to robots ...