Power combiners and associated computer-implemented methods and computer program products are provided. An example power combiner includes a plurality of power input structures each of which defines a waveguide that receives a respective electromagnetic radiation input from a respective power source and a central combining conduit. The central combining conduit receives the respective electromagnetic radiation inputs communicated via respective power input structures and combines the respective electromagnetic radiation inputs into a combined power signal for output via an output port communicably coupled with the central combining conduit. The power combiner may also include a cooling loop configured to dissipate heat from at least one of the power input structures to an external environment of the power combiner.
Systems, apparatuses, and methods that compensate for total ionizing doses and intrinsic base currents in transistors of a bandgap reference circuit are provided. A compensation circuit can include a compensation transistor with a size and one or more bias conditions that are based at least in part on a respective bipolar transistor of a bandgap reference circuit. The compensation circuit can include an operational amplifier that is configured to: (i) set a base-collector voltage of the compensation transistor to zero; and (ii) provide a compensation base current to a base terminal of the compensation transistor that is representative of at least a radiation-induced current transistor or an intrinsic base current for the respective bipolar transistor. A bandgap reference circuit can be augmented with one or more compensation circuits to accommodate for a total ionizing dose and/or an intrinsic base current for one or more transistors of the bandgap reference circuit.
G05F 1/56 - Regulating voltage or current wherein the variable actually regulated by the final control device is DC using semiconductor devices in series with the load as final control devices
G05F 3/30 - Regulators using the difference between the base-emitter voltages of two bipolar transistors operating at different current densities
Flat-plate antennas, antenna systems, and associated methods of manufacturing are provided. An example flat-plate antenna includes an integral body defining a top portion, a bottom portion opposite the top portion, and one or more side portions extending therebetween. The body further defines a channel at least partially enclosed by the body. The flat-plate antenna further includes a plurality of top openings formed in the top portion and one or more bottom openings formed in the bottom portion. The body is configured such that the plurality of top openings are in communication with the one or more bottom openings via the channel such that, in operation, electromagnetic radiation may pass therebetween, such as generated by or received by a radio transceiver communicably coupled with the flat-plate antenna via the bottom portion of the body.
Embodiments of a wide band multi-polarization antenna system are described, which can be attached to the back or front of a soldier's vest or backpack. The antenna system can allow for release of pre-shaped integral radiating elements that spring into a geometric configuration suitable for circular polarization radiation or linear polarization over a desired band of frequencies. The antenna system can provide, when collapsed, linear polarized line-of sight capability over a wide band of frequencies. In a collapsed low-profile state, the antenna system can remain on the soldier, but out of the way for maneuvering.
Embodiments of a wide band multi-polarization antenna system are described, which can be attached to the back or front of a soldier's vest or backpack. The antenna system can allow for release of pre-shaped integral radiating elements that spring into a geometric configuration suitable for circular polarization radiation or linear polarization over a desired band of frequencies. The antenna system can provide, when collapsed, linear polarized line-of sight capability over a wide band of frequencies. In a collapsed low-profile state, the antenna system can remain on the soldier, but out of the way for maneuvering.
Embodiments of a wide band multi-polarization antenna system are described, which can be attached to the back or front of a soldier's vest or backpack. The antenna system can allow for release of pre-shaped integral radiating elements that spring into a geometric configuration suitable for circular polarization radiation or linear polarization over a desired band of frequencies. The antenna system can provide, when collapsed, linear polarized line-of sight capability over a wide band of frequencies. In a collapsed low-profile state, the antenna system can remain on the soldier, but out of the way for maneuvering.
Embodiments of a wide band multi-polarization antenna system are described, which can be attached to the back or front of a soldier's vest or backpack. The antenna system can allow for release of pre-shaped integral radiating elements that spring into a geometric configuration suitable for circular polarization radiation or linear polarization over a desired band of frequencies. The antenna system can provide, when collapsed, linear polarized line-of sight capability over a wide band of frequencies. In a collapsed low-profile state, the antenna system can remain on the soldier, but out of the way for maneuvering.
A microwave radial power divider/combiner device in which ridged waveguides structures are provided to provide adjacent-port isolation, large bandwidth, consistent cross-port phase matching, low insertion loss, and high peak and average power handling characteristics. The device includes a single rectangular input/output waveguide coupled to a bi-conical waveguide, which in turn is coupled to multiple ridged waveguides. These ridged radial waveguides are coupled to waveguide end-launches and impedance transformers located around the circumference of the device.
Embodiments of a wide band multi-polarization antenna system are described, which can be attached to the back or front of a soldier's vest or backpack. The antenna system can allow for release of pre-shaped integral radiating elements that spring into a geometric configuration suitable for circular polarization radiation or linear polarization over a desired band of frequencies. The antenna system can provide, when collapsed, linear polarized line-of sight capability over a wide band of frequencies. In a collapsed low-profile state, the antenna system can remain on the soldier, but out of the way for maneuvering.
Embodiments of a wide band multi-polarization antenna system are described, which can be attached to the back or front of a soldier's vest or backpack. The antenna system can allow for release of pre-shaped integral radiating elements that spring into a geometric configuration suitable for circular polarization radiation or linear polarization over a desired band of frequencies. The antenna system can provide, when collapsed, linear polarized line-of sight capability over a wide band of frequencies. In a collapsed low-profile state, the antenna system can remain on the soldier, but out of the way for maneuvering.
A radio frequency rotary coupler with its power dividers/couplers separated among multiple circuit layers that are axially stacked and interconnected using coaxial feeds. This architecture allows for multiple layers of circuits with minimal outside diameter and while minimizing increase in axial length. The coupler includes a stator, rotor, and dynamic capacitive ring. The stator includes at least a first stator circuit layer with a primary stator power divider (SPD), a second stator circuit layer with at least one secondary SPD, and stator coaxial feeds coupling the primary SPD and the secondary SPD(s). The rotor includes a first rotor circuit layer with a primary rotor power divider (RPD), a second rotor circuit layer with at least one secondary RPD, and rotor coaxial feeds coupling the primary RPD and the secondary RPD(s). The dynamic capacitive ring couples the stator and the rotor via the secondary SPD(s) and RPD(s).
The present disclosure relates to a slotted waveguide antenna system. The slotted waveguide antenna system includes a waveguide that includes a first surface and a plurality of slots defined in the first surface and a metamaterial structure positioned external to the waveguide. The metamaterial structure is configured to exhibit a negative effective permittivity and a negative effective permeability for an operating frequency range. The metamaterial structure includes a split ring resonator, a substrate and a wire structure. The wire structure includes a first portion, a second portion and a third portion, the second portion coupled between the first portion and the second portion, the first portion oriented parallel to the third portion, the second portion oriented perpendicular to the first portion and the third portion. A dimension of at least one of the first portion and the third portion is related to the operating frequency range.
A system comprises a battery including one or more cells, an energy source, a load, and a battery protection circuit coupled to the battery, the energy source and the load. The circuit determines if the charge of each cell is at/above a predetermined, band gap supplied threshold voltage, which results in disconnecting of the battery from the energy source. The circuit also may determine if the charge of any cell is at/below a second predetermined level, which may result in disconnecting of the battery from the load. The circuit may be radiation-hardened (e.g., via redundancy), through the use of two sets of field effect transistors, two logic gates, two groups of comparator circuits, and two relays. The circuit provides multiply redundant protection comprising: redundantly assessing the overvoltage determination; redundantly triggering battery isolation; and preventing inadvertent isolation and non-charging, occurring absent overvoltage, through redundant first and second relays.
H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
G01R 31/28 - Testing of electronic circuits, e.g. by signal tracer
H02H 3/20 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to excess voltage
An antenna system for satellite communication, mounted on a moving platform, includes an antenna assembly, a control and display unit, and an antenna steering unit. The antenna assembly includes mounted on an antenna mast. The antenna steering unit includes a support housing, a rotary joint comprising a BNC connector, an electronic magnetic compass. an angular velocity-sensing gyroscope, a global positioning system receiver, a signal processor and a motor. The direction of the antenna's azimuth axis is determined based on the heading of the moving platform determined by the signal processor. In one embodiment, the director elements, the antenna mast and the azimuth mast are all articulated on flexible joints comprising a cable and spring mechanism allowing the director elements to fold toward the antenna mast and allowing the antenna assembly to fold toward the azimuth mast for stowing.
H01Q 3/08 - Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system using mechanical movement of antenna or antenna system as a whole for varying two co-ordinates of the orientation
H01Q 1/32 - Adaptation for use in or on road or rail vehicles
15.
Composition and method of application to reduce magnetostriction losses in encapsulated microelectronic components
A buffer material protects a microelectronic device in space constrained environments, for improved efficiency with respect to magnetostrictive materials therein, and includes a gas filled polymer shell microsphere carried in an elastomeric polymer binder. Expanded Expancel microspheres being less than 20 microns in diameter form 80% of the composition by volume. The polymer binder is a low viscosity dimethyl silicone with a hardness of less than 25. Coating thicknesses may be based upon the overall expected dimensional changes of the encapsulation material, due to its coefficient of thermal expansion and an expected operating temperature range of the component, plus the expected shrinkage of that encapsulation material during polymerization and the overall mass which shall be exerting a force upon the magnetic core, plus the dimensional changes of the component as a result of the flux density resulting in magnetostriction of the magnetic core.
C08J 9/32 - Working-up of macromolecular substances to porous or cellular articles or materialsAfter-treatment thereof from compositions containing microballoons, e.g. syntactic foams
H01F 41/00 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformersApparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
H01F 27/34 - Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
A multiband antenna includes one or more first antennas embedded within a second antenna. The one or more first antennas can include a folded dipole, and the second antenna can include a monopole. The folded dipole and the monopole may operate at different resonant frequencies. Because the folded dipole is embedded in the monopole, rather than being a separate antenna, near-field coupling between the antennas may be reduced, resulting in enhanced radiation patterns by one or both antennas. More complex antenna structures can also be constructed having multiple antennas embedded within one or more antennas.
A system comprises a battery including one or more cells, an energy source, a load, and a battery protection circuit coupled to the battery, the energy source and the load. The circuit determines if the charge of each cell is at/above a predetermined, band gap supplied threshold voltage, which results in disconnecting of the battery from the energy source. The circuit also may determine if the charge of any cell is at/below a second predetermined level, which may result in disconnecting of the battery from the load. The circuit may be radiation-hardened (e.g., via redundancy), through the use of two sets of field effect transistors, two logic gates, two groups of comparator circuits, and two relays. The circuit provides multiply redundant protection comprising: redundantly assessing the overvoltage determination; redundantly triggering battery isolation; and preventing inadvertent isolation and non-charging, occurring absent overvoltage, through redundant first and second relays.
H02H 3/20 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to excess voltage
18.
Compensation for parasitic resistance in battery monitoring
A system for balancing charge between a plurality of storage battery cells within a storage battery. The battery balancing system may sense changes, possibly caused by environmental influences, in the overall resonant frequency of charge balancing circuits contained within the battery balancing system and compensate for the change in resonant frequency. Further, the system may correct battery cell voltages monitored by a controller that may include errors due to intrinsic circuit problems, such as parasitic voltage, to reflect an actual voltage of a battery cell.
A system for balancing charge between a plurality of storage battery cells within a storage battery. The battery balancing system sense changes, possibly caused by environmental influences, in the overall resonant frequency of charge balancing circuits contained within the battery balancing system. Using a phase locked loop based controller, the battery balancing system compensates for the change in resonant frequency by driving the battery balancing circuits at a frequency that matches the actual sensed resonant frequency of the battery balancing circuits.
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