An antenna radiates signals in Band41 whose center frequency is λ.sub.1 and Band42 whose center frequency is λ.sub.2. A medium substrate is used as a carrier of a top radiating element, a phase inversion unit, and a bottom radiating element; an end of the top radiating element is connected to an end of the phase inversion unit; the other end of the phase inversion unit is connected to an end of the bottom radiating element, a length of the phase inversion unit is 3λ.sub.2/2, and the length of the phase inversion unit is greater than λ.sub.1/2; and the phase inversion unit includes at least two current phase inversion points, a part between the at least two current phase inversion points does not produce radiation, and the top radiating element and the bottom radiating element horizontally radiate the signal in the Band41 and the signal in the Band42 omnidirectionally.

An antenna radiates signals in Band41 whose center frequency is λ.sub.1 and Band42 whose center frequency is λ.sub.2. A medium substrate is used as a carrier of a top radiating element, a phase inversion unit, and a bottom radiating element; an end of the top radiating element is connected to an end of the phase inversion unit; the other end of the phase inversion unit is connected to an end of the bottom radiating element, a length of the phase inversion unit is 3λ.sub.2/2, and the length of the phase inversion unit is greater than λ.sub.1/2; and the phase inversion unit includes at least two current phase inversion points, a part between the at least two current phase inversion points does not produce radiation, and the top radiating element and the bottom radiating element horizontally radiate the signal in the Band41 and the signal in the Band42 omnidirectionally.

A back cover includes: a back cover body, an antenna structure, a first hand-held part, and a second hand-held part arranged apart from the first hand-held part. The antenna structure includes a first part whose first side is separated from one end of the back cover body by a first slit, a second part separated from a second side of the first part by a second slit, and a third part for connecting the first and second parts. The first hand-held part extends to the second part from the back cover body and separated from a third side of the first part by a third slit. The second hand-held part extends to the second part from the back cover body and separated from a fourth side of the first part by a fourth slit, where the back cover body and the antenna structure are made of a metal material.

Antenna suitable to be integrated in a printed circuit board, which is an electromagnetically coupled antenna that comprises: a body of dielectric material of a substantially planar design having a bottom side and top side; a bottom metallized layer on the bottom side of the body, which layer is provided with a slot; a top metallized layer on the top side of the body, which layer is provided with a T-shaped slot; wherein both the above slots, as well as the top and bottom metallized layer surrounding the slots, are provided on symmetrically opposite sides of the body; wherein electrically conductive strands are provided in the body, which strands extend substantially vertically from the bottom side to the top side, and electrically connect the bottom metallized layer with the top metallized layer; wherein the strands are disposed in such a way as to collectively form a row that delimits an inner volume of the body; wherein a feeding line of electrically conductive material is provided inside the body, the feeding line extending in a plane between the bottom side and the top side, wherein the feeding line has a distal section extending within the inner volume of the body delimited by the strands, which distal section has a curled shape in the plane in which it extends.

Antenna suitable to be integrated in a printed circuit board, which is an electromagnetically coupled antenna that comprises: a body of dielectric material of a substantially planar design having a bottom side and top side; a bottom metallized layer on the bottom side of the body, which layer is provided with a slot; a top metallized layer on the top side of the body, which layer is provided with a T-shaped slot; wherein both the above slots, as well as the top and bottom metallized layer surrounding the slots, are provided on symmetrically opposite sides of the body; wherein electrically conductive strands are provided in the body, which strands extend substantially vertically from the bottom side to the top side, and electrically connect the bottom metallized layer with the top metallized layer; wherein the strands are disposed in such a way as to collectively form a row that delimits an inner volume of the body; wherein a feeding line of electrically conductive material is provided inside the body, the feeding line extending in a plane between the bottom side and the top side, wherein the feeding line has a distal section extending within the inner volume of the body delimited by the strands, which distal section has a curled shape in the plane in which it extends.

An electronic device is provided. The electronic device includes a first housing structure including a first side surface member, a second housing structure including a second side surface member, a hinge structure configured to rotatably connect the first housing structure and the second housing structure and configured to provide a folding axis on which the first housing structure and the second housing structure rotate, and at least one printed circuit board, wherein the first side surface member or the second side surface member includes a first side surface portion a second side surface portion, a third side surface portion, a fourth side surface portion, a fifth side surface portion, a first slit a second slit a third slit, and a fourth slit, and a fifth slit, and wherein at least part of at least one of the second side surface portion, the third side surface portion, and the fourth side surface portion is formed of a radiation conductor and is electrically connected to the at least one printed circuit board.

An electronic device is provided. The electronic device includes a first housing structure including a first side surface member, a second housing structure including a second side surface member, a hinge structure configured to rotatably connect the first housing structure and the second housing structure and configured to provide a folding axis on which the first housing structure and the second housing structure rotate, and at least one printed circuit board, wherein the first side surface member or the second side surface member includes a first side surface portion a second side surface portion, a third side surface portion, a fourth side surface portion, a fifth side surface portion, a first slit a second slit a third slit, and a fourth slit, and a fifth slit, and wherein at least part of at least one of the second side surface portion, the third side surface portion, and the fourth side surface portion is formed of a radiation conductor and is electrically connected to the at least one printed circuit board.

In examples, systems and methods for an antenna are described. The antenna array includes a flexible substrate and a plurality of antenna elements forming a two-dimensional array. Each antenna element includes a stripline feed located halfway through a height dimension of the flexible substrate. Each antenna element further includes a rectangular patch antenna having a first dimension equal to one-half of a wavelength at a given frequency of operation, and a second dimension equal to three-quarters of the wavelength at the given frequency of operation. Moreover, each antenna element includes a slot in the rectangular patch having a slot-length approximately equal to 0.925 of a wavelength at the given frequency of operation, where the stripline feed crosses under the rectangular patch and is orthogonal to a polarization of the slot.

In examples, systems and methods for an antenna are described. The antenna array includes a flexible substrate and a plurality of antenna elements forming a two-dimensional array. Each antenna element includes a stripline feed located halfway through a height dimension of the flexible substrate. Each antenna element further includes a rectangular patch antenna having a first dimension equal to one-half of a wavelength at a given frequency of operation, and a second dimension equal to three-quarters of the wavelength at the given frequency of operation. Moreover, each antenna element includes a slot in the rectangular patch having a slot-length approximately equal to 0.925 of a wavelength at the given frequency of operation, where the stripline feed crosses under the rectangular patch and is orthogonal to a polarization of the slot.

An antenna device is provided in the disclosure. The antenna device includes a metal component, a signal cable, and a grounding component. The metal component includes a slot. The slot includes an open end and a closed end, and the open end forms an opening at a side of the metal component. The signal cable includes a signal portion and a grounding portion. The signal cable is disposed such that a projection of the signal portion is partially overlapped with the opening. The grounding portion is electrically connected to the metal component through the grounding component.