A compact munition antenna system that includes a curvilinear transmit antenna on a top and bottom of a ring-shaped substrate, and a curvilinear receive antenna on the top and bottom of the substrate. The transmit antenna and receive antenna are positioned opposite one another on the substrate, and are separated by a pair of isolation barriers to reduce coupling of the two antennas. The munition antenna system may be mounted on a metal cylindrical portion of a guidance system in a nose section of the munition, using a vertical convex surface of the cylindrical portion and a horizontal surface of the munition as a reflector for improving antenna performance.

Methods, systems, and apparatus for using antennas for millimeter wave contactless communication. One of the apparatuses is a communication device that includes a transducer configured to convert electrical signals into extremely high frequency (EHF) electromagnetic signals, the EHF electromagnetic signals substantially emitted from a first surface of the communication device, wherein the transducer is positioned on a substrate of the communication device, and an integrated circuit coupled to the substrate, wherein the transducer includes multiple parallel resonant antenna elements in an array.

A terahertz transceiver, comprising at least a first and a second antenna, wherein the first and/or the second antenna is a dipole antenna comprising a dipole section, wherein the dipole section has a gap through which light can be radiated onto the photoconductive material, and wherein a first ending of the dipole section is connected to a first feedline and a second ending of the dipole section is connected to a second feedline, the feedlines (extending with an angle to the dipole section. The first and/or the second antenna has an asymmetric design, wherein a first section of at least one of the feedlines extending on one side of the dipole section is longer than a second section of the at least one feedline extending on the other side of the dipole section and/or at least one of the feedlines extends on one side of the dipole section, only.

An antenna for receiving wireless power from a transmitter is provided. The antenna includes multiple antenna elements, coupled to an electronic device, configured to receive radio-frequency (RF) power waves from the transmitter, each antenna element being adjacent to at least one other antenna element. Furthermore, the multiple antenna elements are arranged so that an efficiency of reception of the RF power waves by the antenna elements remains above a predetermined threshold efficiency when a human hand is in contact with the electronic device, the predetermined threshold efficiency being at least 50%. Lastly, at least one antenna element is coupled to conversion circuitry, which is configured to (i) convert energy from the received RF power waves into usable power and (ii) provide the usable power to the electronic device for powering or charging of the electronic device.

A multi-band radio frequency (RF) front-end circuit is provided. The multi-band RF front-circuit includes multiple RF circuits configured to amplify RF signals received and/or to be transmitted in multiple RF bands and/or polarizations via an antenna circuit. The antenna circuit includes multiple antenna tap points each coupled to a respective one of the RF circuits. Since each of the RF circuits has a respective impedance that can vary based on the RF bands, the antenna tap points are so positioned on the antenna circuit to each present a respective drive impedance that matches the respective impedance of a coupled RF circuit. Further, the antenna tap points are also positioned on the antenna circuit to cause desired RF isolations between the RF bands and/or the polarizations. Consequently, the multi-band RF front-end circuit can achieve optimal RF performance across a wide range of RF bands with reduced footprint and insertion losses.

A communication module includes an antenna, a transmission circuit, a reception circuit, and a controller. The antenna includes a first antenna element at a transmission side and a second antenna element at a reception side and has an isolation characteristic between the first antenna element and the second antenna element. The transmission circuit is connected to the first antenna element. The reception circuit is connected to the second antenna element. The antenna includes a first variable phase unit configured to vary a phase of a transmission wave to be transmitted from the first antenna element and a second variable phase unit configured to vary a phase of a reception wave to be received by the second antenna element. The controller controls at least one of the first variable phase unit or the second variable phase unit to control an isolation of the antenna.

A tag enhances vehicle radar visibility of objects by increasing the effective radar cross-section of the object, allowing detection at longer ranges and providing the vehicle/driver with more time to avoid a collision. The tag may include a receive antenna and a bandpass filter configured to receive a signal from the receive antenna and to allow a portion of the frequency range of the signal from the receive antenna through. The tag may also include an amplifier configured to receive and amplify the signal with the portion of the frequency range from the bandpass filter. The tag may further include a transmit antenna configured to transmit the amplified signal. The receive antenna, the transmit antenna, and the amplifier may be configured such that antenna-to-antenna isolation between the receive antenna and the transmit antenna is greater than a gain of the amplifier.

An apparatus includes an antenna array having a plurality of antenna elements. The antenna array includes one or more grouping of the plurality of antenna elements, configured to provide: a first configuration in which the one or more grouping of antenna elements supports at least transmission of a signal according to a first antenna system; and a second configuration in which the one or more grouping of antenna elements supports at least reception of a signal according to a second antenna system. The first antenna system includes a Single Input, Single Output antenna system or Multiple Input, Multiple Output antenna system. The second antenna system includes a Single Input, Single Output antenna system or Multiple Input, Multiple Output antenna system. An array of antenna elements can support different modes of operation, for example, different Multiple Input, Multiple Output modes or Multiple Input, Multiple Output and Single Input, Single Output modes.

Waveguide and/or antenna structures for use in RADAR sensor assemblies and the like. In some embodiments, the assembly may comprise a waveguide block comprising a first surface on a first side of the waveguide block and a second surface on a second side of the waveguide block opposite the first side. One or more waveguides may be formed in the waveguide block. One or more antenna slots may be operably coupled with one or more of the waveguides. One or more auxiliary grooves may be positioned adjacent to at least one of the antenna slots and may mimic, or at least substantially mimic, at least one of the one or more antenna slots, such as in length and/or width.

Techniques are disclosed for providing isolation between a pair of partially overlapping antennas. An example electronic device includes a first antenna coupled to a first transceiver through a first signal path comprising a first feed, and a second antenna coupled to a second transceiver through a second signal path comprising a second feed. The first antenna and second antenna partially overlap. The example electronic device also includes compensation circuitry coupled to the first signal path and the second signal path and configured to generate a compensation signal that provides analog cancellation of an interference signal received at the second antenna from the first antenna.