摘要:
A suspended stripline corporate feed with an orthogonal transition to a coaxial transmission line at each of its input/output ports. Alternate I/O ports are pointed in opposite directions so that devices on both sides of the feed can be serviced by the same circuit. The cover for the feed is made out of injection molded, copper plated plastic. When utilized to distribute RF energy to T/R modules in an Active Array, the feed is machined as an integral part of the heat exchanger which cools the modules.
摘要:
A multistage transmission line interconnect device (50) for joining two microstrip circuits (82, 86). A center conductor pin (52) extends through a cylindrical dielectric (54) to form a coaxial midsection of the device. The ends of the pin extend from the dielectric to form a conductor for a straight open troughline at each end of the device. The ends of the pin are connected to the microstrip circuits by ribbon bonds (80, 84). Because the midsection of the device is coaxial, the microstrip circuits (82, 86) may be oriented at arbitrary angles with respect to one another.
摘要:
The present invention relates to panel array antennas, and more particularly to a cooling system for an antenna such as a jet stream conformal panel array antenna. In one embodiment, a panel array antenna for an aircraft includes a closed-loop fluid flow path that passes through the panel array assembly and dissipates heat to the jet stream outside the aircraft. A fluid such as pressurized air passes through this closed-loop path, flowing through strategically-placed openings in the layers of the panel array assembly and flowing over and around the hot electrical components in the panel assembly. The air is heated by these electrical components, and the heated air then flows through the flow path under the top sheet, dissipating the heat to the jet stream outside. In one embodiment, a panel array antenna includes a panel assembly having a top layer through which the antenna radiates or receives a signal, and a fluid flow path through the panel assembly. A first portion of the fluid flow path is disposed below the top layer such that a fluid passing through the first portion of the fluid flow path is in heat transfer proximity to the top layer.
摘要:
Systems and methods for determining a positional state of an airborne array antenna using distributed accelerometers are described. One such method includes receiving and formatting acceleration data from each of a plurality of accelerometers mounted at different locations along the array antenna, receiving position and orientation data from an inertial navigation service (INS) mounted on the array antenna, generating an INS estimated position for each accelerometer based on the position and orientation data from the INS, generating an accelerometer estimated position for each accelerometer based on the acceleration data, determining a position and orientation of each accelerometer based on the respective INS estimated position and the respective accelerometer estimated position, determining an estimated position of a center and an orientation of the array antenna based on the determined position and orientation of each accelerometer, and adjusting a direction of the array antenna based on the estimated position of the array antenna.
摘要:
A reconfigurable fluidic shutter for selectively shielding an antenna array includes a first surface and second surface spaced apart and defining a cavity; and a pump configured to pump liquid that attenuates electromagnetic radiation, such as a liquefied metal or alloy composition, into and out of the cavity. The first and second surface are transparent to electromagnetic radiation, for instance, microwave or other RF radiation.
摘要:
Systems and methods for assembling lightweight RF antenna structures are provided. In one embodiment, the invention relates to a process for forming a lightweight antenna including a process for forming a first feed assembly for the antenna, the process for forming the first feed assembly including providing a flat flexible circuit substrate, providing a formed flexible circuit substrate, applying an adhesive to a plurality of locations on a surface of the flat substrate or the formed substrate, joining the flat substrate and the formed substrate using the adhesive, and heating the joined flat substrate and the formed substrate to bond the substrates.
摘要:
A space-fed conformal array for a high altitude airship includes a primary array lens assembly adapted for conformal mounting to a non-planar airship surface. The lens assembly includes a first set of radiator elements and a second set of radiator elements, the first set and the second set spaced apart by a spacing distance. The first set of radiators faces outwardly from the airship surface to provide a radiating aperture. The second set of radiators faces inwardly toward an inner space of the airship, for illumination by a feed array spaced from the second set of radiators.
摘要:
An exemplary embodiment of a dual band antenna array includes a folded thin circuit board structure with a thin dielectric layer and a conductor layer pattern formed on a first surface of the dielectric layer, the circuit board structure folded in a plurality of folds to form a pleated structure. A first array of radiator structures on the first surface is configured for operation in a first frequency band in a first polarization sense. A second array of radiator structures is configured for operation in a second frequency band in a second polarization sense. A conductor trace pattern is formed on the folded circuit board to carry control signals, DC power and RF signals. Active RF circuit devices are attached to the folded circuit board in signal communication with the conductor trace pattern.
摘要:
A phased array antenna adapted to be mounted in a helmet. In the illustrative embodiment, the antenna comprises a substrate and an array of radiating elements disposed on said substrate, each of the elements including a-resonant cavity and a mechanism for feeding the cavity with an electromagnetic signal., The cavity is formed in a multi-layer structure between a ground plane and a layer of metallization. A radiating slot or slots are provided in the layer of metallization. A first layer of dielectric material is disposed within the cavity. The feed mechanism is a microstrip feed disposed in the first layer of dielectric material parallel to a plane of a portion of the substrate over which an associated element is disposed. A layer of foam is disposed between the layer of dielectric material and the ground plane. Second and third parallel layers of dielectric material are included in each element. The second layer is disposed adjacent to the ground plane. A layer of element interconnection circuitry is disposed between the second and third layers of dielectric material. A transmit/receive module or circuitry for each element is secured to the third layer of dielectric material. The substrate may be conformal or conformable, as well as rigid. An arrangement is included for steering a beam transmitted or received by the antenna.
摘要:
An RF power divider circuit unequally divides an input signal into first and second signal components of unequal power. The circuit includes a single input port, first and second output ports, and a combination of a plurality of quarter wave transformers and a plurality of resistors coupled between the input port and the first and second output ports.