An antenna is made from strips of a shape-memory alloy or other resilient material acting as a spring with attached branches that constitute individual monopole antennas. In the folded state, the antenna looks like a strip roll and can be placed on a satellite. When in orbit, the antenna unfolds after the roll retention mechanism is released and orderly unfolds unrolling from a support frame or otherwise extends. The proposed design of monopole branches utilizes conductors of minimum length and achieves maximum directivity. Each monopole branch is connected to the signal receiver/transmitter by signal conduit elements. A system may include at least two such unfolding antennas thus achieving even greater operational effectiveness in regard to signal steerability, interference suppression and reduced moment of the satellite inertia. To prevent problems, additional measures are used that prevent unwinding of inner layers of the roll before the outer layer is extended.

A method for controlling the lengths of length adjustable elements of an antenna includes engaging a motor drive assembly coupled to each length adjustable element and in response to signals from a motor controller for adjusting the length of the length-adjustable antenna elements to element lengths provided by element length tables coupled to the motor controller, running antenna modeling software coupled to the motor controller to generate antenna performance data as a function of antenna element lengths, and driving the motor controller for each motor drive assembly from data in the element length tables to adjust the lengths of the length-adjustable elements in response to commands entered into a user interface or commands generated by the antenna modeling software running in the processor.

A method for controlling the lengths of length adjustable elements of an antenna includes engaging a motor drive assembly coupled to each length adjustable element and in response to signals from a motor controller for adjusting the length of the length-adjustable antenna elements to element lengths provided by element length tables coupled to the motor controller, running antenna modeling software coupled to the motor controller to generate antenna performance data as a function of antenna element lengths, and driving the motor controller for each motor drive assembly from data in the element length tables to adjust the lengths of the length-adjustable elements in response to commands entered into a user interface or commands generated by the antenna modeling software running in the processor.

The present invention relates to a Yagi antenna and a wireless power transmission apparatus comprising the same, and the Yagi antenna includes a wireless power transmitting coil and first and second slabs made of a metamaterial having a CHDR structure in which cube-shaped resonators are arranged at a predetermined interval. The first slab is positioned at a rear side of the power transmitting coil and serves as a reflector that reflects an electromagnetic wave generated at the power transmitting coil, and the second slab is positioned between the power transmitting coil and a power receiving coil and serves as a super lens that focuses the electromagnetic wave generated at the power transmitting coil. The wireless power transmission apparatus improves efficiency of wireless power transmitted to the power receiving coil by using the Yagi antenna.

The present invention relates to a Yagi antenna and a wireless power transmission apparatus comprising the same, and the Yagi antenna includes a wireless power transmitting coil and first and second slabs made of a metamaterial having a CHDR structure in which cube-shaped resonators are arranged at a predetermined interval. The first slab is positioned at a rear side of the power transmitting coil and serves as a reflector that reflects an electromagnetic wave generated at the power transmitting coil, and the second slab is positioned between the power transmitting coil and a power receiving coil and serves as a super lens that focuses the electromagnetic wave generated at the power transmitting coil. The wireless power transmission apparatus improves efficiency of wireless power transmitted to the power receiving coil by using the Yagi antenna.

An RV television antenna adaptor device includes a main body having a pair of elongated hollow channels for receiving and engaging a pair of support beams of an RV antenna system, and a curved tubular shaft that is positioned opposite to the pair of channels for engaging the circular-shaped opening of a pole-mountable television antenna.

An RV television antenna adaptor device includes a main body having a pair of elongated hollow channels for receiving and engaging a pair of support beams of an RV antenna system, and a curved tubular shaft that is positioned opposite to the pair of channels for engaging the circular-shaped opening of a pole-mountable television antenna.

An antenna is made from strips of a shape-memory alloy or other resilient material acting as a spring with attached branches that constitute individual monopole antennas. In the folded state, the antenna looks like a strip roll and can be placed on a satellite. When in orbit, the antenna unfolds after the roll retention mechanism is released and orderly unfolds unrolling from a support frame or otherwise extends. The proposed design of monopole branches utilizes conductors of minimum length and achieves maximum directivity. Each monopole branch is connected to the signal receiver/transmitter by signal conduit elements. A system may include at least two such unfolding antennas thus achieving even greater operational effectiveness in regard to signal steerability, interference suppression and reduced moment of the satellite inertia. To prevent problems, additional measures are used that prevent unwinding of inner layers of the roll before the outer layer is extended.

An antenna is made from strips of a shape-memory alloy or other resilient material acting as a spring with attached branches that constitute individual monopole antennas. In the folded state, the antenna looks like a strip roll and can be placed on a satellite. When in orbit, the antenna unfolds after the roll retention mechanism is released and orderly unfolds unrolling from a support frame or otherwise extends. The proposed design of monopole branches utilizes conductors of minimum length and achieves maximum directivity. Each monopole branch is connected to the signal receiver/transmitter by signal conduit elements. A system may include at least two such unfolding antennas thus achieving even greater operational effectiveness in regard to signal steerability, interference suppression and reduced moment of the satellite inertia. To prevent problems, additional measures are used that prevent unwinding of inner layers of the roll before the outer layer is extended.

A deployable antenna system for deployment in an extraterrestrial environment is provided, the deployable antenna system comprising a deployment mechanism including one or more extendable support structures comprising at least one axial support structure adapted to extend in a z-direction parallel to a z-axis in the deployable antenna system and a deployable antenna attached to the one or more extendable support structures and adapted to be stowed in an undeployed state and to be unfurled into a deployed state by the deployment mechanism, the deployable antenna being further adapted to extend and unfurl during deployment from the deployment mechanism in the z-direction responsive to extension of the at least one axial support structure, the deployable antenna including one or more flexible membranes coupled to the at least one axial support structure and extending from the z-axis in the deployed state.