Abstract: A patterned article includes a unitary polymeric layer and a plurality of electrically conductive elements embedded at least partially in the unitary polymeric layer. Each electrically conductive element includes a conductive seed layer having a top major surface and an opposite bottom major surface in direct contact with the unitary polymeric layer, and includes a metallic body disposed on the top major surface of the conductive seed layer. The metallic body has a bottom major surface and at least one sidewall. The bottom major surface contacts the conductive seed layer. Each sidewall is in direct contact with the unitary polymeric layer and extends from the bottom major surface of the metallic body toward or to, but not past, a top major surface of the unitary polymeric layer. The conductive elements may be electrically isolated from one another. Processes for making the patterned article are described.

Abstract: Radar retroreflective (R3) devices including an electromagnetic absorber are provided. The electromagnetic absorber is disposed on selected areas of the device to reduce specular reflection without substantially reducing retroreflection of the device.

Abstract: A patterned article includes a unitary polymeric layer and a plurality of electrically conductive elements embedded at least partially in the unitary polymeric layer. Each electrically conductive element includes a conductive seed layer having a top major surface and an opposite bottom major surface in direct contact with the unitary polymeric layer, and includes a metallic body disposed on the top major surface of the conductive seed layer. The metallic body has a bottom major surface and at least one sidewall. The bottom major surface contacts the conductive seed layer. Each sidewall is in direct contact with the unitary polymeric layer and extends from the bottom major surface of the metallic body toward or to, but not past, a top major surface of the unitary polymeric layer. The conductive elements may be electrically isolated from one another. Processes for making the patterned article are described.

Abstract: A compact munition antenna system that includes a curvilinear transmit antenna on a top and bottom of a ring-shaped substrate, and a curvilinear receive antenna on the top and bottom of the substrate. The transmit antenna and receive antenna are positioned opposite one another on the substrate, and are separated by a pair of isolation barriers to reduce coupling of the two antennas. The munition antenna system may be mounted on a metal cylindrical portion of a guidance system in a nose section of the munition, using a vertical convex surface of the cylindrical portion and a horizontal surface of the munition as a reflector for improving antenna performance.

Abstract: An optical construction includes optical stacks arranged across the construction and spaced apart from each other. Each of the optical stacks has a transmittance of at least 60% for at least one visible wavelength and includes one or more electrically conductive layers. The optical stacks are co-extensive with first and second antennas. Each of the electrically conductive layers defines a through opening aligned with at least one of the first and second antennas. For each of an s-polarized first incident signal incident on the optical construction in a first incident plane and a p-polarized second incident signal incident on the optical construction in a second incident plane orthogonal to the first incident plane, for at least one frequency in a range from 0.5 GHz to 10 GHz, and for incident angles of up to 40 degrees, the optical construction has a transmission coefficient of between 0 dB and ?10 dB.

Abstract: A tracker device for a first responder including a radio configured to receive a first radio signal from an emitter, and receive a second radio signal from an unmanned aerial vehicle (UAV). The second radio signal includes at least one data packet including location information associated with the emitter. Processing circuitry in communication with the radio is configured to determine at least one location parameter associated with the emitter based on the first radio signal and the location information of the at least one data packet of the second radio signal.

Abstract: A compact munition antenna system that includes a curvilinear transmit antenna on a top and bottom of a ring-shaped substrate, and a curvilinear receive antenna on the top and bottom of the substrate. The transmit antenna and receive antenna are positioned opposite one another on the substrate, and are separated by a pair of isolation barriers to reduce coupling of the two antennas. The munition antenna system may be mounted on a metal cylindrical portion of a guidance system in a nose section of the munition, using a vertical convex surface of the cylindrical portion and a horizontal surface of the munition as a reflector for improving antenna performance.

Abstract: A body spin detection device for a projectile, the device including a perturbing element and a detection element electrically connected to detection circuitry in the projectile. The detection circuitry configured to receive, via the detection element, a first and second input signals and determine that the first input signal is different from the second input signal based on signal characteristics for the first and second input signals. The detection circuitry is further configured to determine a spin rate for at least one of the despun control portion and the chassis by determining a time period between receiving the first input signal and the second input signal.

Abstract: A patterned article includes a unitary polymeric layer and a plurality of electrically conductive elements embedded at least partially in the unitary polymeric layer. Each electrically conductive element includes a conductive seed layer having a top major surface and an opposite bottom major surface in direct contact with the unitary polymeric layer, and includes a metallic body disposed on the top major surface of the conductive seed layer. The metallic body has a bottom major surface and at least one sidewall. The bottom major surface contacts the conductive seed layer. Each sidewall is in direct contact with the unitary polymeric layer and extends from the bottom major surface of the metallic body toward or to, but not past, a top major surface of the unitary polymeric layer. The conductive elements may be electrically isolated from one another. Processes for making the patterned article are described.

Abstract: A compact munition antenna system that includes a curvilinear transmit antenna on a top and bottom of a ring-shaped substrate, and a curvilinear receive antenna on the top and bottom of the substrate. The transmit antenna and receive antenna are positioned opposite one another on the substrate, and are separated by a pair of isolation barriers to reduce coupling of the two antennas. The munition antenna system may be mounted on a metal cylindrical portion of a guidance system in a nose section of the munition, using a vertical convex surface of the cylindrical portion and a horizontal surface of the munition as a reflector for improving antenna performance.

Abstract: An antenna system may include a source antenna, a frequency selective surface (FSS), and a second antenna or a fluidic channel associated with a housing. In both examples, the FSS has a first side and a second side opposite from the first side. The first side includes horizontally oriented unit cells positioned as multiple columns of unit cells. The first side of the FSS faces the source antenna and is separated from the source antenna by a defined distance. The housing is positioned on the second side of the FSS. In the latter example, the fluidic channel of the housing includes one of air or deionized water. The fluidic channel is positioned on a portion of the second side of the FSS that is opposite to a subset of the horizontally oriented unit cells on the first side of the FSS.

Abstract: An antenna system may include a source antenna, a frequency selective surface (FSS), and a second antenna or a fluidic channel associated with a housing. In both examples, the FSS has a first side and a second side opposite from the first side. The first side includes horizontally oriented unit cells positioned as multiple columns of unit cells. The first side of the FSS faces the source antenna and is separated from the source antenna by a defined distance. The housing is positioned on the second side of the FSS. In the latter example, the fluidic channel of the housing includes one of air or deionized water. The fluidic channel is positioned on a portion of the second side of the FSS that is opposite to a subset of the horizontally oriented unit cells on the first side of the FSS.

Abstract: Antennas suitable for use in RFID devices include an insulating substrate and a first conductive micropattern disposed on or in the substrate, the first conductive micropattern defining a contiguous mesh conductor. The first conductive micropattern forms an antenna responsive to at least a frequency of 915 MHz, and includes interconnected traces having a trace width in a range from 0.5 to 20 microns. Furthermore, the first conductive micropattern is characterized by an open area fraction of at least 80% or 90%. RFID devices include such an antenna and an integrated circuit configured to transmit and receive signals using the antenna. Cards, such as financial transaction cards or identification cards, include such an antenna carried by a card layer.

Abstract: In general, the disclosure describes an RFID tag designed such that the tag is both covert and not easily blocked from the interrogation signal by the hand or other body part of a person. In particular, the RFID tag is designed to have a long, narrow aspect that allows placement of the tag in locations on or in a book that are inconspicuous to the casual observer while extending beyond a hand of a person holding the book by the spine on or near a geometry centerline. The RFID tag includes a dipole segment and a loop segment coupled to the dipole segment. The loop segment of the modified dipole antenna provides the antenna with larger signal strength than conventional dipole antennas. Moreover, the conductive loop segment also provides improved impedance matching capabilities to allow the modified dipole antenna to match the impedance of an integrated circuit (IC) chip of the RFID tag.

Abstract: Antennas suitable for use in RFID devices include an insulating substrate and a first conductive micropattern disposed on or in the substrate, the first conductive micropattern defining a contiguous mesh conductor. The first conductive micropattern forms an antenna responsive to at least a frequency of 915 MHz, and includes interconnected traces having a trace width in a range from 0.5 to 20 microns. Furthermore, the first conductive micropattern is characterized by an open area fraction of at least 80% or 90%. RFID devices include such an antenna and an integrated circuit configured to transmit and receive signals using the antenna. Cards, such as financial transaction cards or identification cards, include such an antenna carried by a card layer.

Abstract: This disclosure describes a radio frequency identification (RFID) tag that includes a three-dimensional (3D) loop antenna. The 3D loop antenna includes a first conductive portion having a length and width that substantially exceed a thickness. The length and width of the first conductive portion substantially lie in a first plane. The 3D loop antenna includes a second conductive portion having a length and width that substantially exceed a thickness. The length and width of the second conductive portion substantially lie in a second plane that is substantially parallel to the first plane. An RFID circuit electrically connected to the loop antenna excites a current through the first and second conductive portions in a current loop that lies in a third plane that is not substantially parallel to the first and second planes. In some instances the third plane may be substantially perpendicular to the first and second planes.

Abstract: The present disclosure relates to multiple embodiments of a signage having radio-frequency responsive features, methods of making and using the signage, and the performance characteristics of the signage. These embodiments include a cutout, aperture, or opening in an electrically conductive element into which or adjacent to which is placed an RFID tag or chip.

Abstract: The present disclosure relates to multiple embodiments of a signage having radio-frequency responsive features, methods of making and using the signage, and the performance characteristics of the signage. These embodiments include a cutout, aperture, or opening in an electrically conductive sign into which or adjacent to which is placed an RFID tag or chip.

Abstract: One exemplary electrically conductive, RFID-enabled signage includes (1) an electrically conductive article including an opening and (2) an assembled device that is coupled to the electrically conductive article to provide RFID functionality to the electrically conductive article. One exemplary kit includes (1) an RFID IC arrangement including conductive leads adjacent to an integrated circuit; (2) an insert attached to the RFID IC arrangement; and (3) an attachment device capable of attaching the RFID IC arrangement-insert combination to an electrically conductive signage such that the RFID IC arrangement is positioned to span at least a portion of an opening in the signage and to electrically couple the integrated circuit to the electrically conductive signage. One exemplary method involves providing an assembled device including and RFID IC arrangement and an insert and coupling the assembled device with an electrically conductive signage.

Abstract: This disclosure describes a radio frequency identification (RFID) tag that includes a three-dimensional (3D) loop antenna. The 3D loop antenna includes a first conductive portion having a length and width that substantially exceed a thickness. The length and width of the first conductive portion substantially lie in a first plane. The 3D loop antenna includes a second conductive portion having a length and width that substantially exceed a thickness. The length and width of the second conductive portion substantially lie in a second plane that is substantially parallel to the first plane. An RFID circuit electrically connected to the loop antenna excites a current through the first and second conductive portions in a current loop that lies in a third plane that is not substantially parallel to the first and second planes. In some instances the third plane may be substantially perpendicular to the first and second planes.