Abstract: Embodiments if the present disclosure relate to a radio frequency (RF) adapter configured to mimic the load that an antenna element would see if it was otherwise radiating into free space. The adapter is configured to come in direct contact with an antenna ground plane so that modes of propagation may be established, and energy coupled from a radiating antenna element into the adapter. The adapter may be of any form that will support direct coupling and include a waveguide (WG) that is coupled to a planar slot radiating element of an antenna array. The WG can have a length, width, height, and a central longitudinal axis and an internal surface. A resistive load can be disposed along the central longitudinal axis of the WG and a reactive load can be disposed in the internal surface of the WG.

Abstract: Embodiments if the present disclosure relate to a radio frequency (RF) adapter configured to mimic the load that an antenna element would see if it was otherwise radiating into free space. The adapter is configured to come in direct contact with an antenna ground plane so that modes of propagation may be established, and energy coupled from a radiating antenna element into the adapter. The adapter may be of any form that will support direct coupling and include a waveguide (WG) that is coupled to a planar slot radiating element of an antenna array. The WG can have a length, width, height, and a central longitudinal axis and an internal surface. A resistive load can be disposed along the central longitudinal axis of the WG and a reactive load can be disposed in the internal surface of the WG.

Abstract: According to embodiment of the disclosure, a wave energy harvesting system comprises a water wave band gap structure (WWBGS) and one or more energy conversion devices. The water wave band gap structure (WWBGS) comprises an array of posts with one or more missing posts that define a defect cavity. The one or more defect cavities are configured to concentrate energy of water waves. The one or more energy conversion devices are positioned in or adjacent to one of the one or more defect cavities and are configured to convert the energy from the water waves into another form of energy.

Abstract: According to embodiment of the disclosure, a wave energy harvesting system comprises a water wave band gap structure (WWBGS) and one or more energy conversion devices. The water wave band gap structure (WWBGS) comprises an array of posts with one or more missing posts that define a defect cavity. The one or more defect cavities are configured to concentrate energy of water waves. The one or more energy conversion devices are positioned in or adjacent to one of the one or more defect cavities and are configured to convert the energy from the water waves into another form of energy.

Abstract: A composite cable and method provides for control of the cable, and particularly its vibration modes, in response to a wide range of resonant and non-resonant energy input. The cable comprises a non-Newtonian fluid (NNF) in a cavity of a flexible tube. The NNF is characterized by viscosity that varies with shear stress. A load applies shear stress to the NNF changing its viscosity to dampen motion of the cable. The cable may comprise inner and outer tubes that are separated by a NNF. The inner tube may be filled with the same or different NNF, a Newtonian fluid or void. A magnetic field magnetic field may be applied to further control the viscosity of the NNF. The magnetic field may be controlled in response to a sensed condition of the cable indicative of shear stress in the NNF to provide either positive or negative feedback.

Abstract: A composite cable and method provides for control of the cable, and particularly its vibration modes, in response to a wide range of resonant and non-resonant energy input. The cable comprises a non-Newtonian fluid (NNF) in a cavity of a flexible tube. The NNF is characterized by viscosity that varies with shear stress. A load applies shear stress to the NNF changing its viscosity to dampen motion of the cable. The cable may comprise inner and outer tubes that are separated by a NNF. The inner tube may be filled with the same or different NNF, a Newtonian fluid or void. A magnetic field magnetic field may be applied to further control the viscosity of the NNF. The magnetic field may be controlled in response to a sensed condition of the cable indicative of shear stress in the NNF to provide either positive or negative feedback.