Described are electronic devices, and specifically provides a multi-frequency slot antenna, a terminal device and an antenna resonance frequency adjustment method. The antenna is applied to a terminal device, and the terminal device includes a metal casing. According to an example, the antenna includes a slot provided in the metal casing, the slot having a first end and a second end opposite to each other in a length direction; a feed terminal across inside of the slot and located between the first end and the second end; and a capacitor provided in the slot, two electrodes of the capacitor being respectively connected with two sides of the slot in a width direction. Furthermore, in the length direction, the capacitor is located at a position where voltages are not zero at original values of multiple orders of resonance frequencies of the antenna when the capacitor is not provided in the slot. In this way, an operating frequency of the antenna includes multiple orders of resonance frequencies.

A circuit board according to an embodiment includes a first substrate including an antenna feeder line formed thereon to connect an antenna driving unit and an antenna, a second substrate including a data line formed thereon to transmit data processed in the antenna driving unit to an electronic component, and a third substrate which is disposed between the first substrate and the second substrate, and includes a power supply line formed thereon to supply a power to the antenna driving unit.

A circuit board according to an embodiment includes a first substrate including an antenna feeder line formed thereon to connect an antenna driving unit and an antenna, a second substrate including a data line formed thereon to transmit data processed in the antenna driving unit to an electronic component, and a third substrate which is disposed between the first substrate and the second substrate, and includes a power supply line formed thereon to supply a power to the antenna driving unit.

An antenna structure includes a substrate, a radiator mounted at an upper portion of a front surface of the substrate, and a grounding element mounted at a lower portion of the front surface of the substrate. The radiator has a first radiating portion. A lower edge of the first radiating portion extends downward to form a second radiating portion. Two portions of a middle of the lower edge of the first radiating portion extend downward to form a third radiating portion and a feeding portion. A free end of the feeding portion is a feeding end. One side edge of the first radiating portion is recessed inward to form a recess. The grounding element has a first grounding portion and a second grounding portion. The first grounding portion and the second grounding portion are located to two sides of the feeding portion, respectively.

An electronic device is provided. The electronic device includes an antenna structure and a housing. The antenna structure includes a first radiating element, a grounding element, and a second radiating element. The first radiating element includes a first radiating portion and a grounding portion. Two ends of the grounding portion are respectively connected with the first radiating portion and the grounding element. The first radiating portion, the grounding portion and the grounding portion form a surrounding structure. The second radiating element includes a second radiating portion, a third radiating portion, a fourth radiating portion, and a feeding portion connected between the second radiating portion, the third radiating portion and the fourth radiating portion. The second radiating portion and the first radiating portion are separated from each other and couple to each other.

An electronic device is provided. The electronic device includes an antenna structure and a housing. The antenna structure includes a first radiating element, a grounding element, and a second radiating element. The first radiating element includes a first radiating portion and a grounding portion. Two ends of the grounding portion are respectively connected with the first radiating portion and the grounding element. The first radiating portion, the grounding portion and the grounding portion form a surrounding structure. The second radiating element includes a second radiating portion, a third radiating portion, a fourth radiating portion, and a feeding portion connected between the second radiating portion, the third radiating portion and the fourth radiating portion. The second radiating portion and the first radiating portion are separated from each other and couple to each other.

An antenna assembly has a conductive line coupled to a feed point. An element is configured to resonate at a predetermined frequency. The element is electrically coupled to the conductive line and aligned perpendicular to the conductive line wherein the predetermined frequency of the element determines a distance from the feed point along the conductive line.

An antenna assembly has a conductive line coupled to a feed point. An element is configured to resonate at a predetermined frequency. The element is electrically coupled to the conductive line and aligned perpendicular to the conductive line wherein the predetermined frequency of the element determines a distance from the feed point along the conductive line.

A single feed antenna design is conducted on a radiator of a specific shape (for example, a strip radiator or a slot radiator) to excite a plurality of antenna modes. For example, performing a feed design on a strip radiator may excite a CM wire antenna mode and a DM wire antenna mode. For another example, performing a feed design on a slot radiator may feed a CM slot antenna mode and a DM slot antenna mode. The antenna design may be used to cover a plurality of frequency bands when an antenna is miniaturized.

Technologies directed to a slot antenna as a calibration antenna for a phased array antenna are described. The antenna structure includes a ground plane, a first antenna element, and a second antenna element. The first antenna element and the second antenna element are located in a first plane that is separated from the ground plane by a first distance. The second antenna element is separated from the first antenna element by a second distance. Conductive material is located in the first plane the first antenna element and the second antenna element. A portion of the conductive material adjacent to the first antenna element includes a slot antenna. A radio frequency feed point is located at the slot antenna. The conductive material electrically isolates the first antenna element and the second antenna element and radiates electromagnetic energy as a slot antenna.