Abstract: A communications system may include radio frequency (RF) circuitry, an antenna assembly, and an RF cable coupling the RF circuitry and the antenna assembly. The antenna assembly may include an antenna and RF impedance selection circuitry coupled thereto. The RF circuitry may be configured to communicate RF signals with the antenna via the RF cable, and communicate RF impedance selection signals to the RF impedance selection circuitry via the RF cable and using an alternating pulse width modulation scheme.

Abstract: A vehicle may comprise a frame, a propulsion arrangement configured to orient the frame, and an antenna carried by the frame. The antenna may include a housing, a base carried by the housing, a pair of spaced apart antenna elements carried by the base, and a phase sifter coupled to the pair of antenna elements to define an antenna pattern having a pair of opposing nulls. An RF receiver is coupled to the antenna. A controller may control the propulsion arrangement to orient the frame to steer the antenna pattern based upon the RF receiver.

Abstract: A radio frequency (RF) device for a vehicle may include an antenna, an RF receiver and a controller. The antenna may include a housing, a rotatable base carried by the housing, an actuator to selectively rotate the base, a pair of spaced apart antenna elements carried by the rotatable base, and a phase sifter coupled to the pair of antenna elements to define an antenna pattern having a pair of opposing nulls. The RF receiver is coupled to the antenna, and the controller may drive the actuator to steer the antenna pattern based upon the RF receiver.

Abstract: A communications system may include radio frequency (RF) circuitry, an antenna assembly, and an RF cable coupling the RF circuitry and the antenna assembly. The antenna assembly may include an antenna and RF impedance selection circuitry coupled thereto. The RF circuitry may be configured to communicate RF signals with the antenna via the RF cable, and communicate RF impedance selection signals to the RF impedance selection circuitry via the RF cable and using an alternating pulse width modulation scheme.

Abstract: Antenna system includes a base structure and a multiplicity of vertebrae arranged in a stack to define a spine. The spine has an elongated length which extends from a base end to a tip end. A compression applicator is configured to apply an elastic compression force on the stack in a direction along the elongated length from the tip end to the base end. Vertebra interfaces associated with each of the adjacent pairs of the vertebrae are configured to facilitate a variable deviation in an angular alignment of a vertebra axis of each vertebra relative to an adjacent one of the vertebra contained in the stack.

Abstract: Antenna system includes a base structure and a multiplicity of vertebrae arranged in a stack to define a spine. The spine has an elongated length which extends from a base end to a tip end. A compression applicator is configured to apply an elastic compression force on the stack in a direction along the elongated length from the tip end to the base end. Vertebra interfaces associated with each of the adjacent pairs of the vertebrae are configured to facilitate a variable deviation in an angular alignment of a vertebra axis of each vertebra relative to an adjacent one of the vertebra contained in the stack.

Abstract: An antenna includes an elongate dielectric strip having opposing first and second sides. A first conductive pattern defines a first radiating element for a first frequency range on the first side of the elongate dielectric strip. A second conductive pattern defines a second radiating element for a second frequency range on the first side of the elongate dielectric strip. The second frequency range is different than the first frequency range. A diplexer circuit is on the elongate dielectric strip between said first and second radiating elements and coupled thereto. A third conductive pattern defines a shared ground plane for the first and second radiating elements on the second side of the elongate dielectric strip.

Abstract: Antenna system includes first and second quadrifilar radiating elements. A first one of the quadrifilar radiating elements (QRE) is comprised of a plurality of first bifilar helical loops (BHLs). The BHLs are oriented in a mutual orthogonal relationship on a common axis. A second QRE shares a common feed structure with the first QRE. The second QRE comprises a plurality of second BHLs oriented in a mutual orthogonal relationship on the common axis. The first QRE is tuned for operation in a first frequency band, the second QRE is tuned for operation in a second frequency band different from the first frequency band.

Abstract: A wireless communications device may include an RF transmitter having an operating frequency range, an RF antenna having an electrical length less than or equal to one-tenth of a wavelength of a lowest operating frequency of the operating frequency range, and an RF matching network coupled between the RF transmitter and the RF antenna. The RF matching network may include a first RF matching transformer, a first inductor coupled between a first reference terminal and a reference voltage, a first resistor coupled across a first output terminal and the first reference terminal and configured to dissipate heat that would otherwise be dissipated by the first RF matching transformer to reduce an operating temperature of the first RF matching transformer, and a heat sink coupled to the first resistor.

Abstract: Antenna system includes first and second quadrifilar radiating elements. A first one of the quadrifilar radiating elements (QRE) is comprised of a plurality of first bifilar helical loops (BHLs). The BHLs are oriented in a mutual orthogonal relationship on a common axis. A second QRE shares a common feed structure with the first QRE. The second QRE comprises a plurality of second BHLs oriented in a mutual orthogonal relationship on the common axis. The first QRE is tuned for operation in a first frequency band, the second QRE is tuned for operation in a second frequency band different from the first frequency band.

Abstract: An antenna includes an elongate dielectric strip having opposing first and second sides. A first conductive pattern defines a first radiating element for a first frequency range on the first side of the elongate dielectric strip. A second conductive pattern defines a second radiating element for a second frequency range on the first side of the elongate dielectric strip. The second frequency range is different than the first frequency range. A diplexer circuit is on the elongate dielectric strip between said first and second radiating elements and coupled thereto. A third conductive pattern defines a shared ground plane for the first and second radiating elements on the second side of the elongate dielectric strip.