An antenna assembly includes a radiator, a first matching circuit and a signal source. The radiator includes a first sub-radiator and a second sub-radiator, wherein a coupling gap is present between the first sub-radiator and the second sub-radiator, and the first sub-radiator and the second sub-radiator are coupled to each other by means of the coupling gap; the first sub-radiator includes a free end, a first coupling end, and a grounding point and a feeding point, which are arranged between the free end and the first coupling end, the grounding point is grounded, and the feeding point is located between the grounding point and the first coupling end; and the second sub-radiator includes a second coupling end and a grounding end, a coupling gap is present between the first coupling end and the second coupling end, and the grounding end is grounded.

A radiation element for an antenna includes a first pair of dipoles. The first pair of dipoles includes a first dipole and a second dipole, where the first dipole has a first radiation arm and a second radiation arm, and the second dipole has a third radiation arm and a fourth radiation arm. A first connection trace between the first radiation arm of the first dipole and the third radiation arm of the second dipole and a second connection trace between the second radiation arm of the first dipole and the fourth radiation arm of the second dipole are parallel to each other. The radiation arms of the first pair of dipoles are planar structures.

A radiation element for an antenna includes a first pair of dipoles. The first pair of dipoles includes a first dipole and a second dipole, where the first dipole has a first radiation arm and a second radiation arm, and the second dipole has a third radiation arm and a fourth radiation arm. A first connection trace between the first radiation arm of the first dipole and the third radiation arm of the second dipole and a second connection trace between the second radiation arm of the first dipole and the fourth radiation arm of the second dipole are parallel to each other. The radiation arms of the first pair of dipoles are planar structures.

A terminal device includes: a first middle frame; a second middle frame connected to the first middle frame, wherein the first middle frame and the second middle frame are configured to fold or unfold via a rotary shaft; a first antenna module, disposed on the first middle frame; a second antenna module, disposed on the second middle frame, wherein when the first middle frame and the second middle frame are closed, a projection of the second antenna module to the first antenna module at least partially overlaps with the first antenna module; and the first antenna module and the second antenna module are respectively connected to corresponding feed circuits.

A capacitor circuit includes a first capacitor bank and a second capacitor bank. The first capacitor bank includes p switch-capacitor circuits connected to each other in parallel, where p is a natural number of 2 or more, wherein at least two switch-capacitor circuits among the p switch-capacitor circuits have mutually different capacitance values based on a first weight. The second capacitor bank includes q switch-capacitor circuits connected to each other in parallel, where q is a natural number greater than p, wherein at least two of the q switch-capacitor circuits have mutually different capacitance values based on a second weight different from the first weight.

An antenna device is provided. The antenna device includes an antenna body portion configured to transmit and/or receive a radio frequency (RF) signal, and including a dielectric material having a first dielectric constant; a metal layer configured to contact the antenna body portion; a first insulation layer configured to cover at least a part of the metal layer; and an electrical connection structure configured to be electrically connected to the metal layer, wherein the first dielectric constant of the antenna body portion is larger than a dielectric constant of the first insulation layer, and is smaller than a dielectric constant of the metal layer.

An antenna device is provided. The antenna device includes an antenna body portion configured to transmit and/or receive a radio frequency (RF) signal, and including a dielectric material having a first dielectric constant; a metal layer configured to contact the antenna body portion; a first insulation layer configured to cover at least a part of the metal layer; and an electrical connection structure configured to be electrically connected to the metal layer, wherein the first dielectric constant of the antenna body portion is larger than a dielectric constant of the first insulation layer, and is smaller than a dielectric constant of the metal layer.

A method and apparatus for impedance matching for an antenna aperture are described. In one embodiment, the antenna comprises an antenna aperture having at least one array of antenna elements operable to radiate radio frequency (RF) energy and an integrated composite stack structure coupled to the antenna aperture. The integrated composite stack structure includes a wide angle impedance matching network to provide impedance matching between the antenna aperture and free space and also puts dipole loading on antenna elements.

A method and apparatus for impedance matching for an antenna aperture are described. In one embodiment, the antenna comprises an antenna aperture having at least one array of antenna elements operable to radiate radio frequency (RF) energy and an integrated composite stack structure coupled to the antenna aperture. The integrated composite stack structure includes a wide angle impedance matching network to provide impedance matching between the antenna aperture and free space and also puts dipole loading on antenna elements.

An earphone module includes an antenna structure. The antenna structure includes a first radiator, a second radiator, a conductive member, and a first insulating member. The first radiator includes a feeding end. The second radiator includes a ground end, and a first slot is formed between the first radiator and the second radiator. The conductive member is connected to the first radiator and the second radiator. The first insulating member is disposed in the first slot. The first radiator, the second radiator, the conductive member, and the first insulating member collectively serve as at least a part of a shell of the earphone module.