Abstract: A beamforming system, comprising a plurality of subsets of tunable resonator elements arranged on a substrate. Each subset of tunable resonator elements comprises at least two resonator elements that have a common resonance property modifiable by a common physical stimulus. A first control input may provide a first physical stimulus to modify the resonance property of all the tunable resonator elements in a first subset of tunable resonator elements. A second control input may provide a second physical stimulus to modify the resonance property of all the tunable resonator elements in a second subset of tunable resonator elements. A controller adjusts the first and second physical stimulus provided via the control inputs between a plurality of physical stimulus values. Each different physical stimulus value corresponds to one of a plurality of a unique resonance patterns and associated unique radiation patterns.

Abstract: Systems and methods are provided for various tunable multi-timescale wireless rectification systems. Tunable multi-timescale wireless rectification systems may include multiple feedback control loops, systems, or sub-systems that modify characteristics of components of a wireless rectification system on various timescales. A wireless rectification system may include antennas, impedance-matching components, rectifying devices, DC-to-DC converters, and/or load controllers. Two or more feedback controls may function on different timescales to modify one or more characteristics or functionalities of components of the wireless rectification system in response to monitored AC and/or DC power values at various locations within the wireless rectification system. Feedback controls operating on various timescales may include antenna feedback controls, impedance feedback controls, rectifying feedback controls, and/or DC feedback controls.

Abstract: Systems, methods, and apparatus are described to provide a large emittance angle and a large beamforming aperture for radiation emitted by a relatively small transmit aperture. For example, a diffractive concentrator structure can provide a large emittance angle and a large beamforming aperture for radiation emitted by a small transmit aperture and delivered to a larger exit aperture.

Abstract: According to various embodiments, systems and methods for providing engineered frequency dispersion for a dynamic wave-processing device across a set of operational frequencies. A set of operational frequencies for a dynamic-wave processing device can be selected. The wave-processing device can comprise, at least in part, a metamaterial with a static structure. Physical design parameters for the static structure of the metamaterial of the dynamic-wave processing device can be selected to dynamically enable a specific set of functional parameters for the metamaterial across the set of operational frequencies.

Abstract: A system is described for providing somatosensory stimuli to a human subject. The system may include an acoustic beamforming device configured to generate a modulated acoustic beam directed at the human subject. The system may also include a signal modulator configured to provide a signal modulation that enhances, subject to the total radiated power constraint, a perceived strength of somatosensory response of at least one type of cutaneous mechanoreceptor cells in the skin of the human subject.

Abstract: A system is described for providing somatosensory stimuli to a human subject. The system may include an acoustic beamforming device configured to generate a modulated acoustic beam directed at the human subject. The system may also include a signal modulator configured to provide a signal modulation that enhances, subject to the total radiated power constraint, a perceived strength of somatosensory response of at least one type of cutaneous mechanoreceptor cells in the skin of the human subject.

Abstract: According to various embodiments, an array of elements forms an artificially-structured material. The artificially-structured material can also include an array of tuning mechanisms included as part of the array of elements that are configured to change material properties of the artificially-structured material on a per-element basis. The tuning mechanisms can change the material properties of the artificially-structured material by changing operational properties of the elements in the array of elements on a per-element basis based on one or a combination of stimuli detected by sensors included in the array of tuning mechanisms, programmable circuit modules included as part of the array of tuning mechanisms, data stored at individual data stores included as part of the array of tuning mechanisms, and communications transmitted through interconnects included as part of the array of elements.

Abstract: The present disclosure provides systems and methods associated with mode conversion for electromagnetic field modification. A mode converting structure (holographic metamaterial) is formed with a distribution of dielectric constants chosen to convert an electromagnetic radiation pattern from a first mode to a second mode to attain a target electromagnetic radiation pattern that is different from the input electromagnetic radiation pattern. A solution to a holographic equation provides a sufficiently accurate approximation of a distribution of dielectric constants that can be used to form a mode converting device for use with one or more transmission lines, such as waveguides. One or more optimization algorithms can be used to improve the efficiency of the mode conversion.

Abstract: The present technology pertains to a system and method of operation of a metamaterial phase shifter having various use applications. In one aspect of the present disclosure, a phase shifter includes a network of tunable impedance elements and a controller. The controller is coupled to the network of tunable impedance elements and configured to receive a phase shift input value and determine a corresponding tuning voltage to be supplied to each tunable impedance element of the network of tunable impedance elements based on the phase shift input value, the network of tunable impedance element being configured to shift a phase of an input signal based on tuning voltages supplied to the network of tunable impedance elements by the controller.

Abstract: In one embodiment, a signal transduction system includes an arrangement of interacting unit cells. Each unit cell can have one or more adjustable parameters that are adjustable to enable one or more adjustable impedance values of the unit cells at each of one or more operational frequencies. The interactions of the unit cells within the arrangement of the interacting unit cells can be describable with an interaction matrix that is approximately independent of the adjustable impedance values of the unit cells.

Abstract: An apparatus includes a base having a first surface and an array of pillars. Each pillar of the array of pillars includes (i) a first end attached to the first surface of the base; (ii) a second end having an electric charge retention portion; (iii) a physical separation from adjacent pillars of the array of pillars; and (iv) an electrical conductor configured to electrically connect the electric charge retention portion with a bus structure. The bus structure is configured to addressably connect with the electrical conductor of each respective pillar of the array of pillars.

Abstract: According to various embodiments, systems and methods for transmitting acoustic waves in a region aided by reflection from environmental objects. An arrangement of acoustically reflective surfaces in an environment of a target can be detected to generate an environmental acoustic propagation channel model. An acoustic radiation pattern for reflecting one or more acoustic waves off of one or more acoustically reflective surfaces in the arrangement of acoustically reflective surfaces towards the target can be identified. A coherent acoustic beamforming device can be controlled to perform coherent beamforming of an acoustic hologram based on the acoustic radiation pattern to generate the one or more acoustic waves for reflection towards the target off of the one or more acoustically reflective surfaces.

Abstract: Embodiments disclosed herein relate to a garment system including at least one sensor and at least one actuator that operates responsive to sensing feedback from the at least one sensor to cause a flexible compression garment to selectively constrict or selectively dilate, thereby compressing or relieving compression against at least one body part of a subject. Such selective constriction or dilation can improve muscle functioning or joint functioning during use of motion-conducive equipment, such as an exercise bike or rowing machine.

Abstract: System and methods are described herein for providing wireless power to a target device, such as a laptop computer, a mobile phone, a vehicle, robot, or an unmanned aerial vehicle or system (UAV) or (UAS). A tunable multi-element transmitter may transmit electromagnetic radiation (EMR) to the target device using any of a wide variety of frequency bands. A location determination subsystem and/or range determination subsystem may determine a relative location, orientation, and/or rotation of the target device. For a target device within a distance range for which a smallest achievable waist of the Gaussian beam of the EMR at an operational frequency is smaller than the multi-element EMR receiver of the target device, a non-Gaussian beamform may be determined to increase efficiency, decrease overheating, reduce spillover, increase total power output of rectenna receivers on the target device, or achieve another target power delivery goal.

Abstract: According to various embodiments, an array of elements forms an artificially-structured material. The artificially-structured material can also include an array of tuning mechanisms included as part of the array of elements that are configured to change material properties of the artificially-structured material on a per-element basis. The tuning mechanisms can change the material properties of the artificially-structured material by changing operational properties of the elements in the array of elements on a per-element basis based on one or a combination of stimuli detected by sensors included in the array of tuning mechanisms, programmable circuit modules included as part of the array of tuning mechanisms, data stored at individual data stores included as part of the array of tuning mechanisms, and communications transmitted through interconnects included as part of the array of elements.

Abstract: A beamforming system, comprising a plurality of subsets of tunable resonator elements arranged on a substrate. Each subset of tunable resonator elements comprises at least two resonator elements that have a common resonance property modifiable by a common physical stimulus. A first control input may provide a first physical stimulus to modify the resonance property of all the tunable resonator elements in a first subset of tunable resonator elements. A second control input may provide a second physical stimulus to modify the resonance property of all the tunable resonator elements in a second subset of tunable resonator elements. A controller adjusts the first and second physical stimulus provided via the control inputs between a plurality of physical stimulus values. Each different physical stimulus value corresponds to one of a plurality of a unique resonance patterns and associated unique radiation patterns.

Abstract: An acoustically-transmissive structure with a three-dimensional distribution of subwavelength acoustic refractive indices to diffractively concentrate acoustic waves incident on an effective aperture of the structure from a range of incidence directions between a minimum acceptance angle and a maximum acceptance angle to a smaller effective aperture. In a specific embodiment, an acoustic system may include a plurality of electroacoustic transducers and an acoustic structure having a first, larger effective aperture with a three-dimensional distribution of acoustic refractive indices. The acoustic structure diffractively concentrates acoustic waves received at a first set of angles of incidence to a first electroacoustic transducer and diffractively concentrates acoustic waves received at a second set of angles of incidence to a second electroacoustic transducer.

Abstract: Embodiments disclosed herein are directed to systems and methods of dispensing one or more medicaments to a subject. The systems and methods utilize at least one flexible compression garment having one or more medicament dispensers therein.

Abstract: The present disclosure provides systems and methods associated with mode conversion for ultrasound and acoustic radiation devices. A mode converting structure (holographic metamaterial) is formed with a distribution of acoustic material properties selected to convert an acoustic pressure pattern from a first mode to a second mode to attain a target radiation pattern that is different from the input radiation pattern. A solution to a holographic equation provides a sufficiently accurate approximation of a distribution of acoustic material properties to form a mode converting device. One or more optimization algorithms can be used to improve the efficiency of the mode conversion and generation of the acoustic mode converter.

Abstract: Empirically modulated antenna systems and related methods are disclosed herein. An empirically modulated antenna system includes an antenna and a controller programmed to control the antenna. The antenna includes a plurality of discrete scattering elements arranged in a one- or two-dimensional arrangement. A method includes modulating operational states of at least a portion of a plurality of discrete scattering elements of the antenna in a plurality of different modulation patterns. The plurality of different modulation patterns includes different permutations of the discrete scattering elements operating in different operational states. The method also includes evaluating a performance parameter of the antenna responsive to the plurality of different empirical one- or two-dimensional modulation patterns. The method further includes operating the antenna in one of the plurality of different one- or two-dimensional empirical modulation patterns selected based, at least in part, on the performance parameter.