Abstract: A printed circuit board antenna includes a printed circuit board and a feedpoint that is disposed on the printed circuit board. A copper coating is disposed on the printed circuit board. A split is disposed on the copper coating on the printed circuit board. The split is connected to a board edge of the printed circuit board. A slot perpendicular to the split is disposed on the copper coating on the printed circuit board. The slot is connected to the split. The copper coating at two sides of the split forms a first antenna and a second antenna. The feedpoint is configured to, together with the first antenna and the second antenna, form a first resonance loop and a second resonance loop. Resonance frequencies of the first resonance loop and the second resonance loop are different.

Abstract: A wireless terminal is disclosed. The wireless terminal includes a first antenna, a second antenna, a printed circuit board, a bracket, and a resonator, where the first antenna is located at one side of the printed circuit board, the second antenna is located at another side of the printed circuit board, the printed circuit board functions as a metal ground of the first antenna and the second antenna, the resonator is located on the bracket, a ground point of the resonator is located on the printed circuit board, and a clearance exists between the resonator and the printed circuit board, the bracket is plastic bracket.

Abstract: A mobile terminal, where the mobile terminal includes an antenna, where the antenna includes a first radiator, a second radiator that forms an electrical connection with the first radiator, a first ground branch that forms a coupling part with one end of the first radiator, and a second ground branch that forms another coupling part with the other end of the first radiator, where the first radiator, the first ground branch, and the second ground branch form an outer frame of the mobile terminal, the second radiator encircles in an inner side of the outer frame formed by the first radiator, the first ground branch, and the second ground branch, and the first radiator and the second radiator generate resonances in different frequency bands.

Abstract: A wireless terminal is disclosed. The wireless terminal includes a first antenna, a second antenna, a printed circuit board, a bracket, and a resonator, where the first antenna is located at one side of the printed circuit board, the second antenna is located at another side of the printed circuit board, the printed circuit board functions as a metal ground of the first antenna and the second antenna, the resonator is located on the bracket, a ground point of the resonator is located on the printed circuit board, and a clearance exists between the resonator and the printed circuit board. Not only does the wireless terminal improve isolation between multiple antennas, but also the resonator can better radiate energy of the antennas because a clearance exists between the resonator and the PCB.

Abstract: An antenna and a mobile terminal with the antenna including a first radiator and a first capacitor structure. A first end of the first radiator is electrically connected to a signal feed end of a printed circuit board by means of the first capacitor structure, and a second end of the first radiator is electrically connected to a ground end of the printed circuit board. The first radiator, the first capacitor structure, the signal feed end, and the ground end form a first antenna, configured to generate a first resonance frequency. An electrical length of the first radiator is less than or equal to one eighth of a wavelength corresponding to the first resonance frequency.

Abstract: An apparatus comprising: a first antenna having a first end coupled to a first port and a second end coupled to a second port, the first antenna extending between the first and second ends and having a mid-point substantially halfway between the first and second ends, the first antenna having a first electrical length and resonant in a first operational resonant frequency band; a second antenna extending from the first antenna at a position between one of the first and second ends and the mid-point of the first antenna, the second antenna having a second electrical length and resonant in a second operational resonant frequency band; and a third antenna extending from the first antenna at position between one of the first and second ends and the mid-point of the first antenna, the third antenna having a third electrical length and resonant in a third operational resonant frequency band.

Abstract: A printed circuit board antenna includes a printed circuit board and a feedpoint that is disposed on the printed circuit board. A copper coating is disposed on the printed circuit board. A split is disposed on the copper coating on the printed circuit board. The split is connected to a board edge of the printed circuit board. A slot perpendicular to the split is disposed on the copper coating on the printed circuit board. The slot is connected to the split. The copper coating at two sides of the split forms a first antenna and a second antenna. The feedpoint is configured to, together with the first antenna and the second antenna, form a first resonance loop and a second resonance loop. Resonance frequencies of the first resonance loop and the second resonance loop are different.

Abstract: An electronic device is disclosed, where the electronic device is provided with a metal frame, the electronic device further includes an antenna feeding point, an antenna ground, a feeding branch, a grounding branch, an antenna resonance arm, a variable capacitor, and a control circuit. The antenna resonance arm is a part of the metal frame after segmentation, the antenna feeding point is disposed on the feeding branch, a first connection portion and a second connection portion are disposed on the antenna resonance arm, the feeding branch is disposed between the second connection portion and the antenna ground, the grounding branch is disposed between the first connection portion and the antenna ground, the variable capacitor is disposed on the feeding branch, the variable capacitor is disposed between the antenna feeding point and the second connection portion, and the control circuit is configured to adjust a capacitance of the variable capacitor.

Abstract: The present disclosure relates to the field of antenna technologies and discloses a feeding matching apparatus of a multiband antenna, a multiband antenna, and a radio communication device to improve a bandwidth and efficiency of a lower frequency band. The feeding matching apparatus of a multiband antenna includes: a grounding portion; a feeding portion connected to a signal source, where a signal of the signal source is input into the feeding portion; and two or more ground cable branches with different lengths, where one end of each ground cable branch is electrically connected to the feeding portion, the other end is electrically connected to the grounding portion, at least one ground cable branch is connected in series to a signal filtering component, and the signal filtering component is capable of preventing a signal lower than a frequency point corresponding to the signal filtering component from passing through it.

Abstract: An antenna-includes a first radiator and a first capacitor structure. A first end of the first radiator is electrically connected to a signal feed end of a printed circuit board by means of the first capacitor structure, and a second end of the first radiator is electrically connected to a ground end of the printed circuit board. The first radiator, the first capacitor structure, the signal feed end, and the ground end form a first antenna configured to produce a first resonance frequency. An electrical length of the first radiator is greater than one eighth of a wavelength corresponding to the first resonance frequency, and the electrical length of the first radiator is less than a quarter of the wavelength corresponding to the first resonance frequency.

Abstract: The present invention discloses an antenna and a terminal, which can extend antenna bandwidth. The antenna includes a capacitor component and at least one radiator, where one end of each radiator of the at least one radiator is connected to form a first node, the first node is connected to one end of the capacitor component to form a second node, and the second node is grounded; and the other end of the capacitor component receives a feed signal.

Abstract: A loop-shaped antenna is disposed in a mobile terminal, where the mobile terminal includes a metal back cover at least partially covers the loop-shaped antenna; the loop-shaped antenna includes a feeding matching circuit, a grounding circuit, and a radiation portion, where the radiation portion is connected between the feeding matching circuit and the grounding circuit, and the radiation portion is of a symmetrical loop-shaped structure; the grounding circuit includes a switch component and a inductor, where the switch component and the inductor are connected in parallel and between ground and the radiation portion; the feeding matching circuit includes a feeding end and a variable capacitor, where the variable capacitor is connected between the feeding end and the radiation portion; and the feeding matching circuit is configured to adjust impedance matching of the loop-shaped antenna, and the grounding circuit is configured to adjust a resonance frequency of the loop-shaped antenna.

Abstract: An antenna and a terminal, where the antenna includes a first antenna branch, printed on a first surface of a circuit board, where the first antenna branch includes a first sub-branch; a grounding branch, printed on the first surface, where the grounding branch includes a grounding sub-branch, the first sub-branch and the grounding sub-branch are staggered to form a gap, and the first antenna branch and the grounding branch are mutually coupled through the gap; a second antenna branch, printed on a second surface of the circuit board, where the second surface and the first surface are two opposite surfaces of the circuit board; and a first feed, electrically connected to the first antenna branch; where the second antenna branch is electrically connected to a metal via hole on the circuit board, and the metal via hole is electrically connected to the first feed.

Abstract: The present disclosure discloses a tunable antenna and a terminal. The tunable antenna includes a circuit board, an antenna body configured to transmit and receive a signal of a first frequency band and including a feed end and a ground pin, where the feed end is disposed on the circuit board, and an electrical tuning network, where a ground point disposed on the circuit board is connected to the ground pin of the antenna body by using the electrical tuning network, and the electrical tuning network includes an inductor and a first tunable capacitor with a tunable capacitance value, where a load value of the inductor is changed by tuning a first capacitance value of the first tunable capacitor, so that a first effective electrical length of the antenna body is changed.

Abstract: The present disclosure relates to the field of antenna technologies and discloses a feeding matching apparatus of a multiband antenna, a multiband antenna, and a radio communication device to improve a bandwidth and efficiency of a lower frequency band. The feeding matching apparatus of a multiband antenna includes: a grounding portion; a feeding portion connected to a signal source, where a signal of the signal source is input into the feeding portion; and two or more ground cable branches with different lengths, where one end of each ground cable branch is electrically connected to the feeding portion, the other end is electrically connected to the grounding portion, at least one ground cable branch is connected in series to a signal filtering component, and the signal filtering component is capable of preventing a signal lower than a frequency point corresponding to the signal filtering component from passing through it.

Abstract: An antenna, including a first radiation part, a matching circuit, and a feed source, where the first radiation part includes a first radiator, a second radiator, and a capacitor structure, a first end of the first radiator is connected to the feed source using the matching circuit, the feed source is connected to a grounding part, a second end of the first radiator is connected to a first end of the second radiator using the capacitor structure, a second end of the second radiator is connected to the grounding part, the first radiation part is configured to generate a first resonance frequency, and a length of the second radiator is one-eighth of a wavelength corresponding to the first resonance frequency which helps to reduce an antenna length, and a volume of a mobile terminal.

Abstract: A printed circuit board antenna includes a printed circuit board and a feedpoint that is disposed on the printed circuit board. A copper coating is disposed on the printed circuit board. A split is disposed on the copper coating on the printed circuit board. The split is connected to a board edge of the printed circuit board. A slot perpendicular to the split is disposed on the copper coating on the printed circuit board. The slot is connected to the split. The copper coating at two sides of the split forms a first antenna and a second antenna. The feedpoint is configured to, together with the first antenna and the second antenna, form a first resonance loop and a second resonance loop. Resonance frequencies of the first resonance loop and the second resonance loop are different.

Abstract: A wireless terminal is disclosed. The wireless terminal includes a first antenna, a second antenna, a printed circuit board, a bracket, and a resonator, where the first antenna is located at one side of the printed circuit board, the second antenna is located at another side of the printed circuit board, the printed circuit board functions as a metal ground of the first antenna and the second antenna, the resonator is located on the bracket, a ground point of the resonator is located on the printed circuit board, and a clearance exists between the resonator and the printed circuit board. Not only does the wireless terminal improve isolation between multiple antennas, but also the resonator can better radiate energy of the antennas because a clearance exists between the resonator and the PCB.

Abstract: The present disclosure relates to the field of antenna technologies and discloses a feeding matching apparatus of a multiband antenna, a multiband antenna, and a radio communication device to improve a bandwidth and efficiency of a lower frequency band. The feeding matching apparatus of a multiband antenna includes: a grounding portion; a feeding portion connected to a signal source, where a signal of the signal source is input into the feeding portion; and two or more ground cable branches with different lengths, where one end of each ground cable branch is electrically connected to the feeding portion, the other end is electrically connected to the grounding portion, at least one ground cable branch is connected in series to a signal filtering component, and the signal filtering component is capable of preventing a signal lower than a frequency point corresponding to the signal filtering component from passing through it.

Abstract: Embodiments of the present disclosure provide a PCB connected to a wireless terminal and a wireless terminal. In the embodiments of the present disclosure, distribution of current on a PCB may be changed by resonance current that is generated by a resonant component included in the PCB, so that isolation between at least two antennas increases. In addition, due to existence of the resonance current, electromagnetic radiation capability of the PCB may be increased, so that radiation efficiency of each antenna increases, thereby improving wireless performance of the wireless terminal and effectively ensuring wireless performance of the wireless terminal in various application scenarios. Furthermore, the wireless terminal provided in the embodiment of the present disclosure is simple and easy to implement and has a low cost.