31 results about "Far field radiation pattern" patented technology

A lidar-based apparatus and method are used for the solid state steering of laser beams using Photonic Integrated Circuits. Integrated optic design and fabrication micro- and nanotechnologies are used for the production of chip-scale optical splitters that distribute an optical signal from a laser essentially uniformly to an array of pixels, said pixels comprising tunable optical delay lines and optical antennas. Said antennas achieve out-of-plane coupling of light.As the delay lines of said antenna-containing pixels in said array are tuned, each antenna emits light of a specific phase to form a desired far-field radiation pattern through interference of these emissions. Said array serves the function of solid state optical phased array.By incorporating a large number of antennas, high-resolution far-field patterns can be achieved by an optical phased array, supporting the radiation pattern beam forming and steering needed in solid state lidar, as well as the generation of arbitrary radiation patterns as needed in three-dimensional holography, optical memory, mode matching for optical space-division multiplexing, free space communications, and biomedical sciences. Whereas imaging from an array is conventionally transmitted through the intensity of the pixels, the optical phased array allows imaging through the control of the optical phase of pixels that receive coherent light waves from a single source.

Disclosed is a system and method for determining the far-field radiation pattern of an antenna within a composite radiator. The method involves performing a near-field scan at an angular sample spacing corresponding to a minimum sphere centered at the crossing of two rotational axes encompassing the composite radiator, computing coefficients based on the near-field scan, adding a phase adjustment to the far field based on a translation from the scan origin to a point within the antenna, re-computing the coefficients, and truncating the re-computed coefficients, thereby retaining a number of coefficients corresponding to the diameter of a minimum sphere encompassing the antenna only. In doing so, the far-field radiation pattern of the antenna may be determined from the truncated set of coefficients with interference effects of the composite radiator substantially mitigated.

Novel reconfigurable antennas are provided which may be used to accommodate the requirements for wideband multi-standard handheld communication devices. It is shown that using a shape memory alloy spring actuator, the height of a helical antenna and therefore the pitch spacing and angle can be varied. This can in turn tune the far-field radiation pattern and gain of the antenna dynamically to adjust to new operating conditions. The radiation pattern can further be directed using a two-helix array. Finally, a helical antenna embodiment is implemented and measured using a shape memory alloy actuator. Measurement results confirm that while keeping the centre frequency constant, gain tunability can be attained using this structure.

Provided is a system and method for measuring an antenna radiation pattern in a Fresnel region based on a phi-variation method. The system includes a rotator for changing angles of a reference antenna and a target antenna; a vector network analyzer for obtaining radiation pattern data in accordance with transmission / reception radio frequency (RF) signals between the reference antenna and the target antenna; a measurement unit for calculating a far-field radiation pattern based on the radiation pattern data received from the vector network analyzer; and a controller for controlling the rotator according to a measurement angle transmitted from the measurement unit.

Methods and systems of tagging objects and reading tags coupled to objects. At least some of the illustrative embodiments are systems comprising a reading antenna, a tag reader coupled to the reading antenna, and a radio frequency identification (RFID) tag comprising a tag antenna electromagnetically coupled to the reading antenna. The RFID tag couples to an object such as the body of a living organism or a metallic article. Moreover, the tag antenna has a far-field radiation pattern in a direction away from the object that is substantially unaffected by proximity of the RFID tag to the object, and substantially unaffected by which surface of the RFID tag faces the object.

A method of producing a radiation-emitting component is provided. A far field radiation pattern is predetermined. From the predetermined radiation pattern a refractive index profile for the radiation-emitting component is determined in a direction extending perpendicularly to a main emission direction of the component. A structure is determined for the component, such that the component includes the previously determined refractive index profile. The component is configured according to the previously determined structure.

The present invention provides a laser radar orthogonal transceiver system based on discrete adjustable gratings, including: a transmitting unit and a receiving unit; wherein, the transmitting unit transmits light wave signals along a first direction with a specific far-field radiation pattern, and along the second direction Scanning in two directions; the receiving unit receives the light detection signal emitted by the transmitting unit and reflected by the object to be measured along the second direction, and scans along the first direction; the first direction and the The second direction is vertical; wherein, the emitting unit and / or the receiving unit includes a surface grating array composed of a plurality of surface gratings. The laser radar quadrature transceiver system uses a surface grating array of discrete tunable gratings instead of a continuously tunable phased array grating, thus making its structure simple.