There is provided an antenna that transmits and receives a wireless signal compliant with a designated communication standard, the antenna comprising: a metal plate that is disposed on a circuit board; a first supporting section that supports the metal plate and connects the metal plate to a feed point formed on the circuit board; at least one second supporting section that supports the metal plate and connects the metal plate to a ground plane formed on the circuit board; and a plurality of extension sections that extend from an outer edge of the metal plate toward a direction of the circuit board but have no contact with the circuit board; wherein the plurality of extension sections operate as perturbation elements that form two excitation modes, the two excitation modes spatially intersecting with one other.

Provided are a circularly polarized antenna structure and a wearable device. The circularly polarized antenna structure is applicable to the wearable device and includes: a mainboard; an annular radiator, having an effective perimeter equal to a wavelength corresponding to a central operating frequency of the antenna structure; a feeding terminal electrically connected to the radiator at one end and connected to a feeding module of the mainboard at the other end; and a grounding terminal electrically connected to the radiator at one end and electrically connected to a grounding module of the mainboard through a first capacitor at the other end. With the antenna structure of the present disclosure, a circularly polarized antenna may be implemented in the wearable device.

A dual-band antenna, a wireless local area network (WLAN) device, and a method for manufacturing a dual-band antenna, where the dual-band antenna includes a conductive plane, a smooth curved-surface assembly joined onto the conductive plane, and a feed pin connected to the smooth curved-surface assembly. The conductive plane is configured to function as a first antenna, for receiving and sending a radio frequency signal of a first frequency band, and the smooth curved-surface assembly is configured to function as a second antenna, for receiving and sending a radio frequency signal of a second frequency band. Hence, a curved surface of a surface of the curved-surface assembly that is used as the second antenna transits smoothly. Therefore, a current is distributed relatively evenly, and radiation efficiency is relatively high.

The present invention relates to a biosensor (1) which enables the concentration of a desired molecule inside a liquid in the medium, and essentially comprises at least one metallic plate (2) which functions as a ground plate, and which is preferably manufactured from aluminum, at least one dielectric substrate (3) which is located on top of the metallic plate (2), at least one split-ring resonator (4) which is realized on top of the dielectric substrate (3), and which is coated with a dielectric layer, at least two symmetrical antennas (5) which are realized on the same plane with the split-ring resonator (4) on the substrate (3), at least two ports (6) where a network analyzer is connected with the antennas (5) via SMA (SubMiniature Version A) connectors.

Exemplary embodiments are provided of antennas and antenna systems including the same. In an exemplary embodiment, an antenna generally includes a radiating patch element having an annular rectangular shape. An antenna ground plane is spaced apart from the radiating patch element. A feeding element electrically coupled to the radiating patch element via proximity coupling. The antenna also includes at least two shorting elements electrically coupling the radiating patch element to the antenna ground plane. In other exemplary embodiments, the antenna systems include at least one active GPS antenna, at least one passive antenna, and an isolator.

A magnetic field focusing assembly includes a magnetic field generating device configured to generate a magnetic field, and a split ring resonator assembly configured to be magnetically coupled to the magnetic field generating device and configured to focus the magnetic field produced by the magnetic field generating device.

A solution for proximity detection of an object is disclosed. According to an aspect, there is provided a portable training computer, including a communication circuitry configured to operate according to Bluetooth technology; a radio frequency radiator circuitry coupled to the communication circuitry and configured to receive transmission signals from the communication circuitry and radiate the transmission signals as transmission bursts; a measurement circuitry coupled to the radio frequency radiator circuitry and configured to measure an electric property of the radio frequency radiator circuitry and to determine proximity of an object with respect to the radio frequency radiator circuitry on the basis of the measured electric property; and a controller configured to synchronise measurement timings of the measurement circuitry with the transmission bursts.

A non-contact data receiving/transmitting body is provided which includes an IC chip, a first antenna to which the IC chip is connected, and a second antenna for use as a booster that resonates with the first antenna in a non-contact manner. The first antenna is a ring-shaped antenna having at least three straight portions. The second antenna has a central portion that is bent such that parts of the central portion extend respectively along the three straight portions of the first antenna and are at an angle equal to or greater than 90° to each other. The IC chip is provided on the three straight portions of the first antenna and is connected to the first antenna at the straight portions.

Techniques and apparatuses are described that implement a smart device-based radar system capable of detecting human vital signs using a compact circularly-polarized antenna. A radar system includes at least one compact circularly-polarized antenna with a patch antenna and a quadrature hybrid coupler. The quadrature hybrid coupler is on a separate plane that is above or below the patch antenna. By vertically stacking the patch antenna with the quadrature hybrid coupler, lateral dimensions of the radar system can be reduced relative to other antenna configurations or designs. The quadrature hybrid coupler can also have a ring-shape design to improve isolation and polarization purity of the compact circularly-polarized antenna relative to a rectangular design. The compact circularly-polarized antenna enables a radar system operating at frequencies between approximately 1 gigahertz (GHz) and 24 GHz to be implemented within a variety of small smart devices.

An antenna structure includes: a branching radiator, including a plurality of first radiation modes; a ring-shaped radiator surrounding the branching radiator, and including a plurality of second radiation modes; a feeding point and a grounding point, one of which is connected to the ring-shaped radiator, and the other is connected to the branching radiator; an antenna gap, which is provided between the branching radiator and the ring-shaped radiator. The ring-shaped radiator and the branching radiator are coupled through the antenna gap to form coupled radiation modes. A coupling among the first radiation modes, the second radiation modes and the coupled radiation modes broaden a radiation bandwidth of the antenna structure. The antenna structure may be incorporated in an electronic device.