Abstract: An embodiment method includes identifying a set of targets within a field of view of a millimeter-wave radar sensor based on radar data received by the millimeter-wave radar sensor; capturing radar data corresponding to the set of targets across a macro-Doppler frame; performing macro-Doppler processing on the macro-Doppler frame and determining whether a macro-Doppler signal is present in the macro-Doppler frame based on the macro-Doppler processing; capturing radar data corresponding to the set of targets across a micro-Doppler frame, wherein the micro-Doppler frame has a duration equal to a first plurality of macro-Doppler frames; performing micro-Doppler processing on the micro-Doppler frame and determining whether a micro-Doppler signal is present in the micro-Doppler frame based on the micro-Doppler processing; and activating at least one range bin of a plurality of range bins in response to a determination that at least one of the macro-Doppler signal or the micro-Doppler signal is present.

Abstract: A method for monitoring property changes in a composite material structure includes: transmitting a radio-frequency (RF) signal towards the composite material structure using a millimeter-wave radar sensor embedded in the composite material structure; receiving a reflected signal from the composite material structure using the millimeter-wave radar sensor; processing the reflected signal; and determining a property change in the composite material structure based on processing the reflected signal.

Abstract: A packaged radar includes laminate layers, a ground plane associated with at least one of the laminate layers, a transmit antenna and a receive antenna associated with at least one of the laminate layers, and an electromagnetic band gap structure between the transmit antenna and the receive antenna for isolating the transmit antenna and the receive antenna, the electromagnetic band gap structure including elementary cells forming adjacent columns each coupled to the ground plane, and each elementary cell including a conductive planar element and a columnar element coupled to the conductive planar element.

Abstract: A radio frequency (RF) system includes a flexible substrate that includes a first portion and a second portion. The first portion overlaps a first surface of a substrate. The first surface is on a first side of the RF system. The second portion overlaps a second surface of the substrate. The second surface is on a second side of the RF system. The RF system further includes an antenna disposed over the first portion of the flexible substrate. The antenna is configured to transmit/receive RF signals on the first side of the RF system. The RF system also includes a transmission line disposed on a bent region of the flexible substrate between the first portion and the second portion. The transmission line is configured to propagate the RF signals between the first portion and the second portion on the second side of the RF system.

Abstract: An electronic device for gesture recognition comprises at least one transmission antenna port, at least reception antenna port, an analog-to-digital converter connected to the at least one reception antenna port, and first and second buffer memories connected to the analog-to-digital converter. The first and second buffer memories are configured to store data received from the analog-to-digital converter and configured to output the stored data in an alternating manner.

Abstract: An embodiment system may include a first millimeter-wave radar sensor coupled to a driver-side door of a vehicle, and a second millimeter-wave radar sensor coupled to a side-view mirror of the vehicle adjacent to the driver-side door. The first millimeter-wave radar sensor may be configured to produce a first set of radar data indicative of a presence of an object within a first field of view, and the second millimeter-wave radar sensor may be configured to produce a second set of radar data indicative of a presence of the object within a second field of view. The system may further include a processing circuit coupled to the first millimeter-wave radar sensor and the second millimeter-wave radar sensor, and a controller coupled to the processing circuit, the controller being configured to control an operation of the vehicle based on a control signal provided to the controller by the processing circuit.

Abstract: In accordance with an embodiment, a method of operating a radar system includes receiving radar configuration data from a host, and receiving a start command from the host after receiving the radar configuration data. The radar configuration data includes chirp parameters and frame sequence settings. After receiving the start command, configuring a frequency generation circuit is configured with the chirp parameters and radar frames are triggered at a preselected rate.

Abstract: In accordance with some embodiments, a method is provided. The method includes accessing a predefined numeric sequence at an application processor. The method further includes receiving, from a sensor of the sensor system, a verification sequence having a predetermined quantity of repetitions of the predefined numeric sequence. The method further includes correlating the verification sequence with the predefined numeric sequence. The method further includes counting a quantity of correlations between the predefined numeric sequence and the verification sequence. The method further includes adjusting a parameter of the sensor or the application processor in response to the predetermined quantity of repetitions not equaling the quantity of correlations.

Abstract: According to an embodiment, a method for presence detection includes performing a first scanning comprising scanning a first area using a millimeter-wave radar sensor to produce a first set of radar data; identifying a first set of targets based on the first set of radar data; performing a second scanning comprising scanning portions of the first area corresponding to the first set of targets using the millimeter-wave radar sensor, and performing micro-Doppler measurements on the portions of the first area; and determining which targets of the first set of targets meet a first set of criteria based on the micro-Doppler measurements.

Abstract: In accordance with an embodiment, a method of recognizing a biological target includes performing radar measurements for a plurality of sites on the biological target using a millimeter-wave radar sensor, producing a target data set for the plurality of sites based on the radar measurements, extracting features from the target data set, comparing the extracted features to stored features, and determining whether the extracted features match the stored features based on the comparing.

Abstract: In an embodiment, a method of operating a radar includes: generating a set of chirps; transmitting the set of chirps; receiving chirps corresponding to the transmitted set of chirps; using a finite state machine (FSM) to apply a phase shift to each of the transmitted chirps or each of the received chirps based on a code; and demodulating the received chirps based on the code.

Abstract: In an embodiment, a method of operating a radar includes: transmitting a radiation pulse with the radar during an active mode; asserting a sleep flag after transmitting the radiation pulse; turning off a crystal oscillator circuit of the radar after the sleep flag is asserted; clocking a counter of the radar with a low power oscillator during a low power mode after the sleep flag is asserted; asserting a timer flag when the counter reaches a first threshold; and transitioning into the active mode after the timer flag is asserted.

Abstract: An embodiment method for signal path measurement includes providing a first signal at a common node coupled to a plurality of signal paths that each includes a respective phase rotation circuit. The method also includes providing a second signal, over a first test path, to a first node coupled to a first signal path of the plurality of signal paths, providing the second signal, over a second test path, to a second node coupled to a second signal path of the plurality of signal paths, selecting a signal path from the plurality of signal paths, transmitting, over the selected signal path, one of the first signal and the second signal, and mixing the first signal with the second signal to obtain a measurement signal of the selected signal path. A difference in phase delay between the second test path and the first test path includes a first known phase delay.

Abstract: In accordance with some embodiments, a method is provided. The method includes accessing a predefined numeric sequence at an application processor. The method further includes receiving, from a sensor of the sensor system, a verification sequence having a predetermined quantity of repetitions of the predefined numeric sequence. The method further includes correlating the verification sequence with the predefined numeric sequence. The method further includes counting a quantity of correlations between the predefined numeric sequence and the verification sequence. The method further includes adjusting a parameter of the sensor or the application processor in response to the predetermined quantity of repetitions not equaling the quantity of correlations.

Abstract: In accordance with an embodiment, a method of recognizing a biological target includes performing radar measurements for a plurality of sites on the biological target using a millimeter-wave radar sensor, producing a target data set for the plurality of sites based on the radar measurements, extracting features from the target data set, comparing the extracted features to stored features, and determining whether the extracted features match the stored features based on the comparing.

Abstract: A treadmill includes a belt, a display, a first sensor having first transmission circuitry for transmitting a first radar beam over the belt and first reception circuitry for detecting a first reflected signal that is a reflection of the first radar beam from a user on the belt, a processor connected to the first sensor, the belt and the display, and a non-transitory computer-readable storage medium storing a program to be executed by the processor. The program includes instructions for determining, according to the first reflected signal, first data associated with a vital sign of the user and displaying, according to the first data, the vital sign on the display.

Abstract: A method for operating a mobile device includes detecting a gesture by the mobile device. Detecting the gesture includes receiving a reflected millimeter wave signal by the mobile device, generating a first message in accordance with the detected gesture, and transmitting the first message from the mobile device to an external remote device. The detected gesture is associated with an operation of the remote device.

Abstract: An embodiment method for signal path measurement includes providing a first signal at a common node coupled to a plurality of signal paths that each include a respective phase rotation circuit. The method also includes providing a second signal, over a first test path, to a first node coupled to a first signal path of the plurality of signal paths, providing the second signal, over a second test path, to a second node coupled to a second signal path of the plurality of signal paths, selecting a signal path from the plurality of signal paths, transmitting, over the selected signal path, one of the first signal and the second signal, and mixing the first signal with the second signal to obtain a measurement signal of the selected signal path. A difference in phase delay between the second test path and the first test path includes a first known phase delay.

Abstract: A semiconductor device package includes a radio frequency front end circuit configured to process radio frequency signals, a first antenna, an antenna substrate, and a first conductive barrier. The first antenna is configured to transmit/receive a first radio frequency signal. The antenna substrate includes the first antenna. The antenna substrate is configured to transfer the first radio frequency signal between the radio frequency front end circuit and the first antenna. The first conductive barrier is configured to electromagnetically and electrostatically isolate the first antenna.

Abstract: A device includes a frame, a first circuit board within the frame, and a display over and coupled to the first circuit board. The device further includes a second circuit board electrically coupled to the first circuit board, and a mm-wave gesture sensing system mounted on the second circuit board.