Abstract: A frequency selective structure (FSS), e.g., metamaterial, is disclosed that can be used for structural and electromagnetic (EM) purposes in a radome or antenna structure. The FSS may be used as the core dielectric to provide both mechanical rigidity and to provide an electromagnetic (EM) response that is sculpted for transmission, reflection, and/or absorption of an impinging EM wave. To this end, the FSS can facilitate dual-purpose use (or multi-purpose use).

Abstract: An exemplary method and system are disclosed comprising retroreflective metastructures formed with a plurality of metasurface arrays configured to destructively cancel or interfere, in part, with one another to reduce specular mode associated scattering or reflection. In some embodiments, the retroreflective metastructures are formed by a combination of metasurfaces with different lattice spacings that can exhibit enhanced bandwidth and angular range at near-grazing angles to provide enhanced retroreflective electromagnetic responses.

Abstract: The exemplary system and method for the characterization procedures for complex permittivity of a dielectric material at radio frequencies, including microwave and millimeter-wave wavelengths. The exemplary system and method employ a highly resonant periodic array affixed or placed in proximity thereto to provide a frequency response that varies based on the constituent electromagnetic properties of a sample of dielectric material.

Abstract: A disposable toothbrush assembly has a special hollow handle that contains enough toothpaste for one use. The handle includes a dispensing orifice, preferably at the head. An external plug seals the orifice, and thus also the toothpaste from the exterior. The plug is manually removable to unseal the orifice. A compressed spring within the handle can be released by removing a stop. This causes a piston at the end of the spring to eject the toothpaste through the dispensing orifice on the bristles. The stop is advantageously formed integrally with the plug.

Abstract: The scent dispenser of the present invention has a casing which is attached to the sole of a boot by means of VELCRO. The casing flexes when compressed by the force exerted upon it by the boot upon contact with the ground and returns to its unflexed condition when the boot is raised from the ground. The casing has a cavity for scented liquid and two or more apertures which communicate the cavity with the atmosphere outside the dispenser. When the casing is compressed, scented liquid is expelled from the cavity through the apertures to the atmosphere. When the cavity is not compressed, the liquid is confined within the cavity.