A radar calibration system is for being disposed on a vehicle. The radar calibration system includes a sensing unit and a housing. The sensing unit includes a receiving antenna array, which includes at least four receiving antennas. The receiving antennas are arranged on an antenna plane and have a receiving antenna center. A distance between the receiving antenna center and a ground plane is greater than 40 cm. The receiving antennas are arranged asymmetrically with respect to the receiving antenna center. The housing includes a bottom surface, which is attached on an outer surface of the vehicle. The sensing unit is disposed in the housing. An antenna plane angle between the antenna plane and the outer surface of the vehicle is in a range of 0 degrees to 90 degrees.

Examples disclosed herein relate to a radiating structure. The radiating structure has a transmission array structure having a plurality of transmission paths with each transmission path having a plurality of slots and a pair of adjacent transmission paths forming a superelement. Each superelement has a phase control module to control a phase of a transmission signal. The radiating structure also includes a radiating array structure having a plurality of radiating elements configured in a lattice, with each radiating element corresponding to at least one slot from the plurality of slots and the radiating array structure positioned proximate the transmission array structure. A feed coupling structure is coupled to the transmission array structure and adapted for propagation of a transmission signal to the transmission array structure. The transmission signal is radiated through at least one superelement and at least one of the plurality of radiating elements and has a phase controlled by the phase control module in the at least one superelement.

A method for processing a radar signal is provided. The method may include receiving chirps of a radar signal, sampling the radar signal, dividing the samples that correspond to the chirp of the radar signal into at least two virtual chirps, and processing the radar signal based on the at least two virtual chirps. Also, a corresponding device is provided.

Examples disclosed herein relate to a dynamic supply modulation power amplifier architecture for millimeter wave applications. The architecture includes phase shifters coupled to a power input port, power amplifiers coupled to respective power output ports, variable gain amplifiers coupled to the phase shifters and to the power amplifiers and are configured to supply dynamically varying input power to the power amplifiers. The architecture includes a first look-up table coupled to the variable gain amplifiers to control the variable gain amplifiers. The architecture also includes a second look-up table coupled to the power amplifiers, where each of the power amplifiers is supply modulated by active drain voltage modulation controlled by the second look-up table and variable input power from the variable gain amplifiers. Other examples disclosed herein include a radar system for use in an autonomous driving vehicle and an analog beamforming antenna for millimeter wave applications.

Methods, apparatus, systems and articles of manufacture are disclosed to test RADAR integrated circuits. A radar circuit comprising a local oscillator (LO), a transmitter coupled to the LO and configured to be coupled to a transmission network, a receiver configured to be coupled to the transmission network, and a controller coupled to the LO, the transmitter, and the receiver, the controller to cause the LO to generate a frequency modulated continuous waveform (FMCW), cause the transmitter to modulate the FMCW as a modulated FMCW, cause the transmitter to transmit the modulated FMCW via the transmission network and the receiver to obtain a received FMCW from the transmission network, and in response to obtaining the received FMCW from the receiver, generate a performance characteristic of the radar circuit based on the received FMCW.

An electromagnetic-wave-transmissive module of a vehicle radar is provided to minimize a dielectric impact reflection effect, which occurs when an electromagnetic wave radiated from an antenna is transmitted through a radome and a transmissive cover The electromagnetic-wave-transmissive module includes one or more of a radome covering the antenna and a transmissive cover, which is disposed to be spaced apart from a front side of the antenna and through which a radio wave radiated from the antenna and then transmitted through the radome is subsequently transmitted. At least one coating layer, which includes PTFE and which has a dielectric permittivity higher than the dielectric permittivity of air and lower than the dielectric permittivity of the radome and the transmissive cover, is formed on the surface of at least one of the radome and the transmissive cover.

At least some embodiments of the present disclosure relate to a wearable device. The wearable device comprises a substrate, a detecting module disposed on the substrate, and a control module disposed on the substrate. The control module is electrically connected to the detecting module. The control module is configured to receive a signal from the detecting module and to control the wearable device in response to the signal.

A vehicular forward-sensing system includes a radar sensor and a forward viewing image sensor disposed within a windshield electronics module that is removably installed within the vehicle cabin at the vehicle windshield. A control is responsive to an output of the radar sensor and responsive to an output of the image sensor. Responsive to the image sensor viewing an object present in the path of forward travel of the vehicle and responsive to the radar sensor sensing the object present in the path of forward travel of the vehicle, the control determines that the object is an object of interest by processing by an image processing chip of image data of the object captured by the image sensor at a portion of an image plane of the image sensor that is spatially related to a location of the object present in the path of forward travel of the vehicle.

For example, an apparatus may include a Printed Circuit Board (PCB) including a Ball Grid Array (BGA) on a first side of the PCB, the BGA configured to connect a Surface Mounted Device (SMD) to the PCB; an antenna disposed on a second side of the PCB opposite to the first side, the antenna to communicate a Radio Frequency (RF) signal of the SMD; and an RF transition to transit the RF signal between the BGA and the antenna, the RF transition including a plurality of signal buried-vias; a first plurality of microvias configured to transit the RF signal between the plurality of signal buried-vias and a ball of the BGA, the first plurality of microvias are rotationally misaligned with respect to the plurality of signal buried-vias; and a second plurality of microvias configured to transit the RF signal between the plurality of signal buried-vias and the antenna.

Techniques of identifying gestures include detecting and classifying inner-wrist muscle motions at a user's wrist using micron-resolution radar sensors. For example, a user of an AR system may wear a band around their wrist. When the user makes a gesture to manipulate a virtual object in the AR system as seen in a head-mounted display (HMD), muscles and ligaments in the user's wrist make small movements on the order of 1-3 mm. The band contains a small radar device that has a transmitter and a number of receivers (e.g., three) of electromagnetic (EM) radiation on a chip (e.g., a Soli chip. This radiation reflects off the wrist muscles and ligaments and is received by the receivers on the chip in the band. The received reflected signal, or signal samples, are then sent to processing circuitry for classification to identify the wrist movement as a gesture.