A head-mounted device may have a head-mounted housing that is configured to be worn on a head of a user. While the head-mounted device is being worn, left and right displays in optical modules in the head-mounted device may provide images to eye boxes located rearward of the head-mounted device. A forward-facing publicly viewable display on a front portion of the head-mounted device may be covered with a transparent housing portion forming a display cover layer. Millimeter wave antennas may be mounted under a dielectric member that is interposed between the antennas and an edge portion of the transparent housing portion. The antennas may have planar outer surfaces. The dielectric member may have a planar surface separated from the planar outer surfaces by air gaps and a curved outer surface.

A transparent antenna is fabricated by printing a pattern of catalytic ink onto a web of substrate in one or more conductive regions, wherein a geometry of the conductive regions defines an antenna pattern. A pattern of non-conductive ink is printed in registration onto the substrate in a fill pattern, wherein the fill pattern is an inverse of the antenna pattern within a defined region of interest. A conductive material is electrolessly plated onto the pattern of catalytic ink by transporting the web of substrate through a reservoir of plating solution to provide a corresponding pattern of conductive material, thereby providing the transparent antenna. An average optical transparency in the conductive regions and non-conductive regions is at least 50%, and the average optical transparency in the conductive regions differs from that of the non-conductive regions by no more than 10%.

An emergency rescue equipment having a harmonic reflector circuit comprising an antenna connected to a non-linear circuit via a matching circuit and a casing that in part enclose the harmonic reflector circuit, wherein the harmonic reflector circuit is configured to receive a signal at a receive frequency (fRX), and configured to transmit said received signal at a transmit frequency (fTX), where the transmit frequency is a multiple of the receive frequency, the harmonic reflector circuit wherein the receive frequency (fRX) is in an interval from a first frequency to a second frequency, where the first frequency is at least 800 MHz; and the second frequency is at least 34 MHz larger than the first frequency; the received signal is transmitted at the transmit frequency (fTX) with an output power (Pout) of at least 70% of the maximum available output power (Pmax).

A method for folding and extending an antenna structure capable of transmitting a WiGig band is provided. The method has the following steps: (1) mounting a WiGig module within a base; (2) pivotally arranging the antenna structure on the base; and (3) folding or extending the antenna structure relative to the base to correspondingly reduce or increase the antenna structure for transmitting and receiving a valid range of a wireless signal. The antenna structure has two body portions, and each of the two body portions has a pivoting end and a signal receiving end opposite to the pivoting end. Each of the pivoting ends is pivotally disposed on the base at a first specific angle with respect to a horizontal plane, and each of the signal receiving ends is inclined downward by a second specific angle with respect to the body portion and disposed away from the body portion.

Systems and methods are described that relate to measuring relative positions of, or distance between, a helmet-mountable device and a head-mountable device. The helmet-mountable device includes a radio frequency (RF) source of a millimeter wave signal comprising millimeter wave radiation. The head-mountable device includes a plurality of rectenna devices. Each rectenna device of the plurality of rectenna devices converts millimeter wave radiation emitted by the RF source into a direct current (DC) electrical signal. The head-mountable device includes a memory and at least one processor. The at least one processor executes instructions stored in the memory so as to carry out operations, which include receiving, from each rectenna device of the plurality of rectenna devices, a respective DC electrical signal. The operations also include storing, in the memory, information indicative of the respective DC electrical signals.

Methods, apparatus and systems for motion-predictive beamforming are disclosed. A method for motion predictive beamforming includes determining a time of a predicted transmission and determining a future position of a virtual reality (VR) receiving device at the time of the predicted transmission. Beamforming parameters are forwarded wireless system that correspond to the future position of the VR receiving device, the time of the predicted transmission, and an error correction margin to cause a transmission of a beam that is formed based on the future position of the VR receiving device, the time of the predicted transmission, and the error correction margin.

The disclosed system may include a support structure, a larger ground plane mounted to the support structure, and an antenna module that is positioned above the larger, mounted ground plane. The antenna module may include an antenna and a separate, smaller ground plane that is smaller than the mounted ground plane. As such, the antenna and the smaller ground plane may be elevated above the larger, mounted ground plane that is mounted to the support structure. Various other mobile electronic devices, apparatuses, and systems are also disclosed herein.

A reflector apparatus is provided. A further aspect employs at least one antenna or radar operably emitting signals, and a moving object-mounted reflector which operably reflects at least some of the signals back to the at least one antenna or radar, the reflector including trihedral walls with metallic reflective surfaces. In another aspect, a programmable controller in an automotive vehicle determines a moving object-characteristic based on at least reflected signals received by a horn antenna using a Doppler or micro-Doppler effect. Still another aspect includes a trihedral reflector which moves with a movable object including handlebars, a straddled user seat and being one of: a bicycle, a motorcycle, or an all-terrain vehicle. A further aspect includes multiple spaced apart trihedral reflectors attached to a user-wearable, flexible and nonconductive substrate.

A head mounted display (HMD) device includes a housing configured to mount on a face of a user, at least one display mounted in the housing, a wireless personal area network (WPAN) antenna mounted in a medial region of the housing, and first and second wireless local area network (WLAN) antennas located at respective lateral peripheries of the housing. The WPAN antenna includes a directional patch antenna comprising a feed line, a three-dimensional (3D) ground plane formed as a plurality of conductive sidewalls and a ground plane structure disposed at a first end of the sidewalls, wherein the ground plane structure is substantially perpendicular to the plurality of sidewalls. The WPAN antenna also includes a radiating surface disposed at a second end of the sidewalls opposite of the first end, wherein the radiating surface includes a patch antenna structure coupled to the feed line.

A communication system, which is applied to a space, includes a first transceiver and a communication device. The first transceiver is fixedly disposed in the space. The communication device is movable in the space. The communication device includes a base, a second transceiver, a detection circuit, an arm and a processor. The second transceiver is oriented to an orientation and configured to build a signal transmission with the first transceiver. The detection circuit is configured to detect a displacement or rotation of the communication device with respect to the first transceiver, in order to generate detection information. One end of the arm is connected to the base, and another end of the arm is connected to the second transceiver. The processor is configured to control an operation of the arm according to the detection information, in order to maintain the orientation of second transceiver directing to the first transceiver.