Example radar systems are presented herein. A radar system may include an input layer having a feed waveguide and a first portion of a first waveguide section. The antenna system also includes a first dividing layer having a second portion of the first waveguide section and a first portion of a second waveguide section. The antenna system also includes a second dividing layer having a second portion of the second waveguide section and a first portion of a third waveguide section. Additionally, the antenna system includes an antenna layer having a plurality of radiating elements arranged in a linear array and a second portion of the third waveguide section. The antenna system further includes a path length from the feed waveguide to each radiating element is the same as the path length for each other radiating element.

Example radar systems are presented herein. A radar system may include an input layer having a feed waveguide and a first portion of a first waveguide section. The antenna system also includes a first dividing layer having a second portion of the first waveguide section and a first portion of a second waveguide section. The antenna system also includes a second dividing layer having a second portion of the second waveguide section and a first portion of a third waveguide section. Additionally, the antenna system includes an antenna layer having a plurality of radiating elements arranged in a linear array and a second portion of the third waveguide section. The antenna system further includes a path length from the feed waveguide to each radiating element is the same as the path length for each other radiating element.

A method and a system for ultra high frequency communication with and location of a portable device for “hands-free” access to a motor vehicle, the motor vehicle having an on-board communication device comprising an ultra high frequency transceiver, an electrical power supply source and at least one antenna, the motor vehicle including a first arrangement, in which the transceiver is connected to the antenna, and a second arrangement, in which the transceiver is disconnected from the antenna. The transceiver is connected to an attenuation module located at a predetermined distance from the transceiver. The attenuation module includes an impedance of predetermined value connected to ground. The predetermined distance between the transceiver and the attenuation module, as well as the predetermined value of the impedance, defining a locating area of the portable device in and around the motor vehicle.

A vehicle exterior component, such as a handle assembly, a light module, a minor housing, or an applique holds a radar sensor. A stand-alone radar module for mounting within a vehicle exterior component comprises a module housing defining an interior space configured to hold a radar module including a heat source, and a sealing material extending between the radar module and the module housing for blocking moisture and other contaminants. Several different arrangements attaching a heat sink to a radar IC for dissipating heat from the radar IC are provided.

An antenna apparatus is provided with: at least one antenna element; and a dielectric lens including a lens body made of a first dielectric material having a first dielectric constant, the lens body having first and second surfaces opposing each other. The lens body is formed so as to refract an incident wave on the antenna element or an incident wave from the antenna element, at refracting angles that gradually increase as a distance from an axis passing through centers of the first and second surfaces increases.

An antenna apparatus is provided with: at least one antenna element; and a dielectric lens including a lens body made of a first dielectric material having a first dielectric constant, the lens body having first and second surfaces opposing each other. The lens body is formed so as to refract an incident wave on the antenna element or an incident wave from the antenna element, at refracting angles that gradually increase as a distance from an axis passing through centers of the first and second surfaces increases.

This document describes techniques, apparatuses, and systems for a multi-layer air waveguide with layer-to-layer connections. Each pre-formed layer of the air waveguide is attached to at least one other pre-formed layer by a mechanical interface. The mechanical interface may be a stud-based interface, a snap fastener-based interface, a ball-and-socket based interface, or a pressure contact interface utilizing irregular roughed surfaces of each pre-formed layer. The mechanical interfaces of the pre-formed layers structurally hold the air waveguide together and electrically couple all of the pre-formed layers. In this manner, the cost of manufacturing the air waveguide antennas may be less expensive than previous manufacturing processes.

Systems and methods are provided for tracking a passive controller system using an active sensor system within a mixed-reality environment. The passive controller system includes a body configured to be held in a hand of a user, as well as a plurality of retroreflectors that collectively provides at least 180 degrees of reflecting surface for reflecting a radar signal in at least 180 degrees of spherical range when the passive controller system is positioned within a predetermined distance from a source of the radar signal and with an orientation that is within the at least 180 degrees of spherical range relative to the source of the radar signal. Signals transmitted to the passive controller and reflected back from the passive controller are used to calculate the position and orientation of the passive controller system relative to the active sensor system.

A level measurement instrument including: a transmitter configured to transmit an electromagnetic transmission signal, the electromagnetic transmission signal being a microwave signal or a radio wave signal a receiver configured to receive a plurality of electromagnetic return signals; an elongate electromagnetic radiation guide coupled to the transmitter to guide the electromagnetic transmission signal, wherein the elongate electromagnetic radiation guide is provided with a plurality of windows spaced along the elongate electromagnetic radiation guide, the windows being at least partially transmissive to the electromagnetic transmission signal such that in use, when the elongate electromagnetic radiation guide is introduced into a fluid column, the electromagnetic transmission signal interacts with fluid adjacent each window and generates electromagnetic return signals, the return signal from each window being dependent on a parameter of the fluid adjacent each window such that different fluids in the fluid column have different return signals.

The present disclosure relates to a MIMO radar system, comprising a first beamforming network (6) comprising a first beam ports (7A) and antenna ports (7B), wherein the first beamforming network is configured to connect the first beam ports via the first antenna ports to the first antenna elements, wherein the first beamforming network is configured to generate for each first beam port a single beam pattern. The first antenna elements transmitting or receiving a single beam pattern selected from the number of single beam patterns, wherein the first antenna elements are spaced apart at a first distance selected to provide a beam pattern of the first antenna array essentially consisting of a plurality of single main lobes. The radar system also has a similar second beamforming network (8). The second antenna elements of which are spaced apart at a second distance, larger than the first distance, the second distance being selected to provide a beam pattern of the second antenna array essentially consisting of multiple main lobes and multiple side lobes.