An electromagnetic wave induction device using smoke instead of antennas and a switch using the same adopt the smoke to realize the induction of the electromagnetic wave signal, and the smoke replaces the antenna as the receiving device, which is not susceptible to the environment and can be applied to occasions where antenna is limited. Smoke can reduce the safety hazard caused by the antenna, and can be recognized by the naked eye, so as to intuitively read signal transformation and realize the visualization of electromagnetic wave signal induction. Compared with the conventional electromagnetic wave induction device, the present invention provides a brand-new electromagnetic induction device. The antenna of the receiving portion is replaced by the smoke in the experimental cavity, and the smoke is directly used as a signal receiving device, which overcomes the antenna constraints in prior art.

The present invention relates to a generation device and a generation method of terahertz waves with orbital angular momentum. The generation device comprises a first laser and a second laser; the first laser radiates a first laser beam; the second laser radiates a second laser beam; and the frequency difference between the first laser beam and the second laser beam is within a terahertz wave band. The generation device further comprises an orbital angular momentum generator, a beam combiner and a terahertz radiation generator; the first laser beam passes through the orbital angular momentum generator to generate the first laser beam with the orbital angular momentum; after the first laser beam with the orbital angular momentum and a second laser beam are combined to form a combined beam, the combined beam reaches a terahertz radiation transmitter; the terahertz radiation transmitter performs frequency mixing and filtering processing on the first laser beam A with the orbital angular momentum and the second laser beam B to generate terahertz waves with the orbital angular momentum. Through a simple beam path design, terahertz wave beams with orbital angular momentum, which are low in consumption and high in efficiency, can be obtained.

An electronic device may be provided with wireless circuitry. The wireless circuitry may include one or more antennas and transceiver circuitry such as millimeter wave transceiver circuitry. The antennas may be formed from metal traces on printed circuits. A flexible printed circuit may have an area on which the transceiver circuitry is mounted. Protruding portions may extend from the area on which the transceiver circuitry is mounted and may be separated from the area on which the transceiver circuitry is mounted by bends. Antenna resonating elements such as patch antenna resonating elements and dipole resonating elements may be formed on the protruding portions and may be used to transmit and receive millimeter wave antenna signals through dielectric-filled openings in a metal electronic device housing or a dielectric layer such as a display cover layer formed from glass or other dielectric.

An electronic device may be provided with wireless circuitry. The wireless circuitry may include one or more antennas and transceiver circuitry such as millimeter wave transceiver circuitry. The antennas may be formed from metal traces on printed circuits. A flexible printed circuit may have an area on which the transceiver circuitry is mounted. Protruding portions may extend from the area on which the transceiver circuitry is mounted and may be separated from the area on which the transceiver circuitry is mounted by bends. Antenna resonating elements such as patch antenna resonating elements and dipole resonating elements may be formed on the protruding portions and may be used to transmit and receive millimeter wave antenna signals through dielectric-filled openings in a metal electronic device housing or a dielectric layer such as a display cover layer formed from glass or other dielectric.

Aspects of the subject disclosure may include, for example, a system having a first plurality of transmitters for launching according to a signal, first electromagnetic waves, and a second plurality of transmitters for launching, according to the signal, second electromagnetic waves. The first electromagnetic waves and the second electromagnetic waves combine at an interface of a transmission medium to induce a propagation of a third electromagnetic wave, the third electromagnetic wave having a non-fundamental wave mode and a non-optical operating frequency, and wherein the second plurality of transmitters are spaced apart from the first plurality of transmitters in a direction of propagation of the third electromagnetic wave. Other embodiments are disclosed.

Aspects of the subject disclosure may include, for example, a system having a first plurality of transmitters for launching according to a signal, first electromagnetic waves, and a second plurality of transmitters for launching, according to the signal, second electromagnetic waves. The first electromagnetic waves and the second electromagnetic waves combine at an interface of a transmission medium to induce a propagation of a third electromagnetic wave, the third electromagnetic wave having a non-fundamental wave mode and a non-optical operating frequency, and wherein the second plurality of transmitters are spaced apart from the first plurality of transmitters in a direction of propagation of the third electromagnetic wave. Other embodiments are disclosed.

The present disclosure relates to the field of microwave and optoelectronic technologies, and in particular to an integrated microwave photon transceiving front-end for a phased array system, including: a ceramic substrate, on which a control integrated circuit, a silicon-based photonic integrated chip, a first amplifying chipset, a second amplifying chipset, and a microwave switch chipset are carried. The control integrated circuit is configured to control the silicon-based photonic integrated chip and the microwave switch chipset by means of an input control signal. The silicon-based photonic integrated chip is connected at one end with an input/output optical fiber, and at the other end with the first amplifying chipset and the second amplifying chipset. The two amplifying chipsets are connected to the microwave switch chipset respectively, and the microwave switch chipset is further connected with a phased array antenna.

A device for generating wide capture range frequency tunable optical millimeter-wave signal includes a millimeter-wave signal generating structure, a millimeter-wave signal modulation structure, an optical delay phase detection structure and a feedback control loop. The millimeter-wave signal generating structure obtains millimeter-wave signal by beat frequency of the optical signal generated by a master laser and a slave laser, the millimeter-wave signal is modulated onto an optical carrier of the master laser by the electro-optical modulation structure, and then passes through the optical delay phase detection structure to generate an error signal associated with a frequency of the millimeter-wave signal. The error signal is controlled by the feedback control loop to change temperature and driving current of the slave laser, and adjust a difference between output wavelengths of the master laser and the slave laser, and at last maintain the frequency and phase of the millimeter-wave be stable.

A communication network system is a communication network system that distributes information to a plurality of terminals inside a closed space. The communication network system includes a network server and a plurality of lighting fixtures each having an antenna that transmits and receives millimeter-wave-band communication signals to and from the terminals.

A system for enabling signal penetration into a building comprises first circuitry, located on an outside of the building, for receiving RF signals and converting the RF signals into a format that overcomes losses caused by penetrating a structure of the building over a wireless communications link. The first circuitry further comprises a first transceiver dongle including a signal processing chipset for converting the received RF signals to the format that overcomes the losses occurring when the signals penetrate the structure of the building. Second circuitry, located on the interior of the building, receives the signals in the format that overcomes the losses caused by penetrating the structure of the building over the wireless communications link and converts the signals to a second format for transmission to the wireless devices within the building. The second circuitry further comprises a second transceiver dongle including the signal processing chipset for converting the received signals in the format that overcomes the losses caused by penetrating into the interior of the building into the second format.