11results about "Loop antennas with variable reactance" patented technology

A controllable electrical outlet may comprise a resonant loop antenna. The resonant loop antenna may comprise a feed loop electrically coupled to a radio-frequency (RF) communication circuit and a main loop magnetically coupled to the feed loop. The controllable electrical outlet may comprise one or more electrical receptacles configured to receive a plug of a plug-in electrical load and may be configured to control power delivered to the plug-in electrical load in response to an RF signal received via the RF communication circuit. The RF performance of the controllable electrical outlet may be substantially immune to devices plugged into the receptacles (e.g., plugs, power supplies, etc.) due to the operation of the resonant loop antenna. For example, degradation of the RF performance of the controllable electrical outlet may be less when the controllable electrical outlet includes the resonant loop antenna rather than other types of antennas.

An electronic device according to one embodiment of the present invention comprises: a housing including a first plate and a second plate; a side member; a display; a printed circuit board; an NFC circuit; and a processor. The side member comprises: a first metal frame; a second metal frame; a first insulation member disposed between the first metal frame and the second metal frame; and a support member which forms a first loop with the first metal frame and a second loop with the second metal frame, and supports the display and the printed circuit board. The NFC circuit is electrically connected to the first loop, and the second loop can be electrically connected to a first reactive load circuit.

A capacitively or inductively driven spiral antenna creates an electric current distribution of a dipole, which generates a sensible magnetic field for various military applications including detecting and pre-detonating improvised explosive devices (IEDs). The antenna includes a dielectric substrate, a spiral antenna, driving elements such as tuning forks or loop, and a coaxial cable that connects to a source terminal. The substrate is a low dielectric loss insulating material to provide support for the antenna. The spiral antenna is tuned to a natural frequency is disposed on the substrate. The coaxial cable extends from the substrate to the source terminal.

In some embodiments, a radio frequency identification (RFID) system may include at least one Ultra High Frequency (UHF) antenna component, a conductive loop having a largest dimension that is smaller than the wavelength of radiation transmitted at a Microwave Frequency (MW). The conductive loop may define a gap and an RFID chip may be electrically coupled to the conductive loop. The conductive loop may be configured to be resonant at an Ultra High Frequency (UHF) and less resonant at Microwave Frequency (MW). The antenna component may be selected from the group consisting of a dipole antenna, a monopole antenna, a loop antenna, or a slot antenna.

A wrist-worn electronic device comprises a housing, a first antenna, a second antenna, and an electrical switch. The housing includes a circumferential side wall, an electrically conductive bezel, a bezel retainer, a lower ring and an electrically conductive bottom plate. The first antenna is formed in part by a portion of the bezel and receives a first wireless signal having a first frequency in a global navigation satellite system (GNSS) band. The second antenna is formed in part by at least a portion of the bottom plate and transmits a second wireless signal to a non-terrestrial network (NTN), receives a third wireless signal from the NTN, or both. The electrical switch having a plurality of selectable positions each associated with a tuning network that causes the second antenna to transmit the second wireless signal at a second frequency and to receive the third wireless signal at a third frequency.

The application discloses a parameter acquisition method of a circular ring antenna array with equal-amplitude and in-phase patch feed, the antenna array comprises a metal ground plane and a plurality of equal-amplitude and in-phase excited antenna units arranged in a linear array on the metal ground plane, the antenna unit has a common mode port, each common mode port comprises two single ports, an active common mode reflection coefficient of the common mode port of the antenna unit is equal to half of the sum of common mode reflection coefficients of the two single ports, the common mode reflection coefficient of the single port is calculated first, and the active common mode reflection coefficient of the common mode port is indirectly obtained; the application has the advantages that the calculation process is simplified, the calculation amount is small, the time consumption is relatively short, and the application is beneficial to popularization and application in engineering practice.

Provided are a circularly polarized antenna structure and a wearable device. The antenna structure being circularly polarized and including a mainboard; an annular radiator, wherein the mainboard and the annular radiator are spaced apart to form an annular gap structure; a feeding terminal electrically connected to the annular radiator at a first end and connected to a feeding module of the mainboard at a second end; and a grounding terminal electrically connected to the annular radiator at a first end and electrically connected to a grounding module of the mainboard through a first capacitor at a second end.

An antenna structure includes a middle frame body. The middle frame body includes a main board and an embedded metal, the embedded metal includes a metal body part and a metal extension part, the metal main body part and the metal extension part are an integral structure, the main board includes a first main board and a second main board, the first main board is electrically connected to the metal extension part, the first main board is configured to introduce a radio frequency signal into the metal extension part, the second main board is electrically connected to the metal extension part, and the second main board is configured to ground the metal extension part.

A reconfigurable antenna, a control method therefor, a router, and a signal transceiving device are disclosed. The reconfigurable antenna may include: a horizontal polarization antenna including a patch structure arranged on an upper surface of a first dielectric plate and a first reflector arranged on a lower surface of the first dielectric plate; a vertical polarization antenna arranged below the horizontal polarization antenna and including a third dielectric plate and a fourth dielectric plate which are perpendicular to the first dielectric plate; and an antenna board, including a fifth dielectric plate.

Embodiments of this application provide a printed antenna, to expand an operating frequency and a directivity pattern coverage mode that can be selected by the antenna. The printed antenna is printed on a substrate, a feed module is further disposed on the substrate, and the printed antenna includes a loop antenna body, a feed port, and a switch component. The loop antenna body includes a first end and a second end, there is a spacing between the first end and the second end, a connection line between the first end and the second end forms a closed loop with the loop antenna body, the first end is connected to the feed module by using the feed port, and the second end is connected to a ground point (GND). The feed module is configured to output a feed signal to the loop antenna body by using the feed port. The loop antenna body includes a plurality of loop antenna branches, the switch component is disposed between every two adjacent loop antenna branches, and the switch component is configured to connect or disconnect the two adjacent loop antenna branches.