Abstract: Embodiments described herein provide for integrating a transmit phased-array (Tx) antenna and a receive phased-array (Rx) antenna onto an electrically-conductive plate that forms a ground plane. The plate includes groves that operate as an RF choke. The RF choke mitigates the energy coupling between the Tx antenna and the Rx antenna. Spatial features of the grooves are selected based on a scan angle of at least one of the Tx antenna and the Rx antenna. Due to the electronic scanning performed by the Tx antenna and the Rx antenna, the energy coupling between the Tx antenna and the Rx antenna dynamically varies and may depend upon the relative scan angles between main beams of the antennas. The energy coupling may also depend upon the side lobe energy pattern of the Tx antenna, which varies based on the scan angle of the Tx antenna.

Abstract: Embodiments described herein provide for integrating a transmit phased-array (Tx) antenna and a receive phased-array (Rx) antenna onto an electrically-conductive plate that forms a ground plane. The plate includes groves that operate as an RF choke. The RF choke mitigates the energy coupling between the Tx antenna and the Rx antenna. Spatial features of the grooves are selected based on a scan angle of at least one of the Tx antenna and the Rx antenna. Due to the electronic scanning performed by the Tx antenna and the Rx antenna, the energy coupling between the Tx antenna and the Rx antenna dynamically varies and may depend upon the relative scan angles between main beams of the antennas. The energy coupling may also depend upon the side lobe energy pattern of the Tx antenna, which varies based on the scan angle of the Tx antenna.

Abstract: Embodiments described herein provide for integrating a pair of phased-array antennas onto a common electrically-conductive plate, with groves fabricated into a top surface of the plate that operate as an RF choke. One embodiment comprises an apparatus that includes an electrically-conductive plate that has a top surface and an opposing bottom surface, a transmit phased-array antenna comprising a first plurality of holes through the plate from the top surface to the bottom surface that include RF transmit elements, and a receive phased-array antenna comprising a second plurality of holes through the plate from the top surface to the bottom surface that include RF receive elements. The apparatus further includes a plurality of grooves fabricated on the top surface of the plate that attenuate EM radiation induced on the receive phased-array antenna by the transmit phased-array antenna by a pre-defined amount.

Abstract: An antenna aperture for mounting on the outside mast structure of a submarine is disclosed. The antenna aperture is designed to withstand hydrostatic pressure cycles as would be experienced by a submarine. The antenna is constructed of a highly corrosion resistant housing upon which a wide angle impedance (WAIM) cover designed to meet antenna RF requirements is integrated.

Abstract: An antenna aperture for mounting on the outside mast structure of a submarine is disclosed. The antenna aperture is designed to withstand hydrostatic pressure cycles as would be experienced by a submarine. The antenna is constructed of a highly corrosion resistant housing upon which a wide angle impedance (WAIM) cover designed to meet antenna RF requirements is integrated.

Abstract: A phased array antenna system on an aircraft that incorporates a choke plate that significantly attenuates sidelobes of the antenna beam pattern at elevation angles that would cause RF interference with ground-based terrestrial wireless networks. The choke plate includes a plurality of choke grooves that substantially circumscribe the antenna aperture. The choke plate has an upper surface that is positioned generally coplanar with the upper surface of the antenna aperture. The grooves of the choke plate may be filled with a dielectric material. The choke plate provides a smooth aerodynamic component that significantly attenuates beam scattering, and thus the radiation pattern sidelobes of the antenna at or below the horizon, when the aircraft is in flight.

Abstract: A conformal phased array antenna and associated method of repairing the antenna are provided. The antenna has individual subassemblies or line replaceable units such that the antenna can be repaired without completely removing the entire antenna. The antenna generally includes a planar antenna subassembly including an array of RF modules disposed in a reference plane. The antenna also typically has a contoured waveguide subassembly including a contoured aperture honeycomb structure. The contoured aperture honeycomb structure defines a number of passages that are in communication with respective RF modules. The exterior surface of the contoured aperture honeycomb structure that faces away from the planar antenna subassembly is contoured such that at least portions of this surface are at an oblique angle with respect to the reference plane. This contoured surface may advantageously be shaped to match the contour of the surface of the structure to which the antenna is mounted.

Abstract: A conformal phased array antenna and associated method of repairing the antenna are provided. The antenna has individual subassemblies or line replaceable units such that the antenna can be repaired without completely removing the entire antenna. The antenna generally includes a planar antenna subassembly including an array of RF modules disposed in a reference plane. The antenna also typically has a contoured waveguide subassembly including a contoured aperture honeycomb structure. The contoured aperture honeycomb structure defines a number of passages that are in communication with respective RF modules. The exterior surface of the contoured aperture honeycomb structure that faces away from the planar antenna subassembly is contoured such that at least portions of this surface are at an oblique angle with respect to the reference plane. This contoured surface may advantageously be shaped to match the contour of the surface of the structure to which the antenna is mounted.