NRL's Magnetically Attracted Fluid System (Code 8230). The system allows fluid transfer in conditions where the host and target systems are moving independent of each other at unknown and uncontrolled relative rates. Magnetically Attracted Fluid Transfer System

NRL in partnership with the Defense Advanced Research Projects Agency (DARPA) have developed a new system where a refueling vehicle can be operated autonomously or remotely to fuel a vehicle with a magnetically coupled rapid-breakaway fuel transfer system. The system provides a self-aligning magnetic connection between the host system and a target system. The magnetic connection includes a transferrable puck that the host system manually or autonomously attaches to a target vehicle’s fuel receptacle. Enhancing the system with a controllable electromagnet, it can directly control when the puck is transferred or if a connection should be maintained during refueling. The magnetic connection differential allows the puck to connect to the target system, and in the case of a jolt to the system, the magnetic connection will be lost to the host system while the puck remains connected with the target.

3D Microfabrication of Beam Tunnels for High Power Vacuum Electronic Devices

NRL has developed a novel microfabrication process for creating highly precise, geometrically round tunnels in all-metal, photolithographically-formed structures for the purpose of transporting electron beams through vacuum electro-magnetic slow-wave circuits in the millimeter wave (mmW) and sub-mmW frequency ranges (approx. 90 GHz to over 1 THz).

Stop-Rotor Rotary Wing Aircraft

NRL has developed a patented system and method of transitioning an aircraft between helicopter and fixed wing flight modes. The stop rotor aircraft is capable of both a helicopter mode vertical takeoff and landing (VTOL) and efficient high speed fixed wing flight by flipping the left wing/rotor blade 180 degrees between flight modes. Conversion between flight modes will take about 1-2 seconds and simulations indicate altitude deviations of less than 50 feet.

SiC Epitaxial Layers with Low Basal Plane Dislocation Concentrations

NRL has developed a process for manufacturing silicon carbide epiwafers with low basal plane dislocation (BPD) concentration that saves time and resources on the production line by relying on epitaxial growth interrupts. The reduction of BPDs relies on the conversion of BPDs to threading edge dislocations (TEDs) at each growth interrupt and the use of multiple interrupts to achieve a desired overall BPD reduction. The interrupted/modified epitaxial growth technique relies on straight forward in situ growth process that may be easy to implement with commercial epitaxial growth systems.

AlSb/InAs High Electron Mobility Transistors

NRL has developed materials growth and fabrication technology for the manufacture of high-speed, low power AlSb/InAs high electron mobility transistors (HEMTs) that exhibit state-of-the-art low-power performance. This technology includes the use of an InAlAs/AlSb barrier layer to reduce gate leakage current and a Pd/Pt/Au ohmic contact metallization, which enables ultra-low contact resistance.

Improved Growth Method for III-V Nitride Devices

NRL has developed a materials growth method that results in significantly improved crystalline quality of wide bandgap semiconducting nitrides precisely where it is needed most – in the active region of a vertical conduction device. The NRL technique, shown schematically above, is applicable to a wide range of substrates and uses a dielectric mask to confine epitaxial growth to a vertical column.

Triode Carbon Nanotube Electron Sources

NRL has developed field emitter arrays (FEAs) based on integrally gated carbon nanotubes (CNTs). Electrons are produced via field emission from in-situ grown CNTs on microfabricated gated post structures (above left) or in gated open apertures (above right). Very low operating voltages, chemically stable CNT surface, and lack of electrical arcing make these more robust than conventional FEAs.

Subscribe to Electronics