A broadband stacked multi-spiral antenna array comprising two or more spiral antennas with a dielectric layer having a generally uniform thickness positioned between each pair of stacked antennas, which are all center-fed and in-phase. The antenna array may be embedded in a non-conductive material, such as fiberglass embedded in a resin, a honeycomb core sandwich, or structural foam, that may be used to form a structural element of a mobile platform. The structural element may include a via providing a pathway for coaxial cables. If two structural elements are hatch covers on the port and the starboard sides of an aircraft, the use of a stacked multi-spiral antenna array in each structural element provides two roughly hemispherical coverage patterns which together provide an omni-directional coverage pattern. The stacked multi-spiral antenna array may also include a reflecting cavity placed at the bottom of one of the spiral antennas.

Disclosed is a calibration device of an imaging system for a moving carrier, the imaging system including: a support panel; an antenna array comprising radiating elements positioned on the support panel; and optical sensors capable of providing images and positioned on the support panel. The calibration device includes at least one optical pattern generator, each generator being secured to the support panel.

Systems, devices, and methods for a vertical take-off and landing (VTOL) aerial vehicle having a first GPS antenna and a second GPS antenna, where the second GPS antenna is disposed distal from the first GPS antenna; and an aerial vehicle flight controller, where the flight controller is configured to: utilize a GPS antenna signal via the GPS antenna switch from the first GPS antenna or the second GPS antenna; receive a pitch level of the aerial vehicle from the one or more aerial vehicle sensors in vertical flight or horizontal flight; determine if the received pitch level is at a set rotation from vertical or horizontal; and utilize the GPS signal not being utilized via the GPS antenna switch if the determined pitch level is at or above the set rotation.

A phased array of electrolytic fluid antennas comprising: a center conduit filled with electrolytic fluid; a current probe having a central hole therein, wherein the center conduit is disposed within the central hole; and a plurality of electrolytic fluid antennas composed of free-standing streams of electrolytic fluid circularly-distributed about the center conduit, wherein each electrolytic fluid antenna is fluidically coupled to the center conduit by a fluid transmission line of a desired length, and wherein each electrolytic fluid antenna is configured to turn on or off in real time to change the characteristics of the phased array.

Antennas configuration for unmanned aerial vehicle (UAV) comprising at least one pair of patch antennas. Each patch antenna having a patch mounted on a ground plane. A UAV body having at least one portion constructed of material that minimally attenuates the electromagnetic signal transmitted or received by said plurality of antennas. Wherein the at least one pair of Cpatch antennas are mounted within the UAV body and near the inner surface of the UAV body. Each antenna from the pair of patch antennas further installed opposite to one another and each of the patches facing outside from the UAV body.

A phased array antenna comprising: a center conduit filled with electrolytic fluid; a current probe having a central hole therein, wherein the center conduit is disposed within the central hole; and two electrolytic fluid antennas positioned parallel to the center conduit and fluidically coupled to the electrolytic fluid in the center conduit so as to form a field-goal-shaped phased array antenna such that the current probe feeds the electrolytic fluid antennas through magnetic induction.

A flat antenna for satellite communication includes a radiating board. The radiating board includes at least one radiating line, and an adapter configured to modify the delay of the fields transmitted or received by the radiating line. The adapter includes a horn mobile in rotation between the two metal plates, and a multilayer power supply circuit. The first layer of the multilayer power supply circuit is formed at least one metal plate containing an array of slot sensors and the last layer of the multilayer power supply circuit is provided with at least one coupling slot connected to the radiating line. The first layer and the last layer is linked by at least one transmission line. The length of the transmission line is suitable for introducing a delay required to focus the wave radiated by the radiating line.

A flat antenna for satellite communication includes a radiating board. The radiating board includes at least one radiating line, and an adapter configured to modify the delay of the fields transmitted or received by the radiating line. The adapter includes a horn mobile in rotation between the two metal plates containing a sensor array. The horn is also mobile in rotation between at least one coaxial cable connected between at least one sensor of the network and the radiating line. The length of the coaxial cable is suitable for introducing a delay required to focus the wave radiated by the radiating line.

A surface wave antenna system is presented. The surface wave antenna system is configured to be coupled to a surface and includes an antenna and a radiation modifier. The radiation modifier includes a material having a graded dielectric constant. A final portion of the radiation modifier includes material having a dielectric constant that produces a signal phase velocity in signals emitted from the radiation modifier that is substantially equal to a phase velocity of signals on the surface.

A directionally-tunable antenna element of an antenna is provided. The directionally-tunable antenna element includes a feed structure, a coupling structure, and a ridge structure. The coupling structure is disposed between the feed structure and the ridge structure and communicates electromagnetic energy between the feed structure and the ridge structure. These structures address challenges associated with satellite tracking and frequent satellite handoffs in an electronically scanned array (ESA). The disclosed aspects enhance performance of ESA antenna systems, addressing shortcomings of ESA antenna systems yet while addressing the satellite tracking and frequent satellite handoff challenges. The disclosed aspects provide for antennas with highly efficient useable gain bandwidth, high scan angle performance, and consistent and high cross polar isolation over a full scan angle range.