The present invention provides an antenna system and a mobile terminal. The antenna system comprises a metal frame, a main board received in the metal frame, and a first feeding point, a second feeding point, a first grounding point, a second grounding point, a third feeding point, a fourth feeding point, a third grounding point, a fourth grounding point, a first tuning switch, a second tuning switch, a first matching network, a variable capacitor, a third tuning switch, a fourth tuning switch, and a second matching network disposed at the main board. The metal frame is divided into a first radiating portion and a second radiating portion at the bottom and a third radiating portion and a fourth radiating portion at the top.

A dual-polarized omnidirectional antenna, which includes a vertically polarized antenna and a loop horizontally polarized antenna. The vertically polarized antenna includes a vertical fixed cover and a cylindrical antenna which is fixedly mounted in the vertical fixed cover. The horizontally polarized antenna includes a horizontal fixed cover and a loop antenna which is fixedly mounted in the horizontal fixing cover. The vertical fixed cover is fixedly mounted on the horizontal fixed cover. The cylindrical antenna receives the vertically polarized signal, and the loop antenna receives the horizontally polarized signal. The loop antenna can also receive the horizontally polarized signal omnidirectionally at the same time to ensure a better receiving effect.

Broadband HF antenna system includes a conductive radiating element in the form of a continuous conductive loop. The conductive loop includes first and second elongated conductor portions. The conductive loop is electrically connected at first and second loop ends to an impedance matching network disposed within a chassis. The first elongated conductor portion is comprised of a whip antenna which functions as a cantilevered spring attached at one end to the rigid chassis. The whip antenna is resiliently maintained in a curved state by a tension force applied by the second elongated conductor portion. A spacing or gap between the first and second elongated conductor portions to establish the loop configuration is maintained exclusive of any spacer or hanger element.

Various embodiments of the present invention relate to an electronic device including an antenna impedance matching circuit. The electronic device may comprise: at least one interface; at least one detection circuit for detecting a connection of at least one external device to the at least one interface; at least two matching circuits; an antenna; and a switch module for receiving, from the at least one detection circuit, at least one signal corresponding to whether the at least one external device is connected to the at least one interface, and for connecting the antenna to a matching circuit, among the at least two matching circuits, corresponding to the at least one signal. Various other embodiments are also possible.

The present disclosure provides an antenna. The antenna includes a PCB board, a matching circuit, and a feeder. The PCB board is provided with a ground plane. The ground plane is provided with an open slot. One end of the matching circuit is connected to a signal source, and the other end of the matching circuit is connected to an end of the feeder. The feeder passes across the open slot. An endpoint of the feeder is connected to one side of the open slot. The antenna further includes a capacitor C1 and an inductor L1. The capacitor C1 and the inductor L1 are located in the open slot. The capacitor C1 and the inductor L1 are connected in series. The antenna may further generate a low frequency based on an original frequency band.

The present disclosure provides an antenna. The antenna includes a PCB board, a matching circuit, and a feeder. The PCB board is provided with a ground plane. The ground plane is provided with an open slot. One end of the matching circuit is connected to a signal source, and the other end of the matching circuit is connected to an end of the feeder. The feeder passes across the open slot. An endpoint of the feeder is connected to one side of the open slot. The antenna further includes a capacitor C1 and an inductor L1. The capacitor C1 and the inductor L1 are located in the open slot. The capacitor C1 and the inductor L1 are connected in series. The antenna may further generate a low frequency based on an original frequency band.

Provided is a mobile terminal comprising: a case; an antenna radiator mounted in the case; a ground mounted in the case; an radio frequency (RF) signal supply unit for generating a Radio Frequency (RF) signal; a feeding line connecting the RF signal supply unit and a first point of the antenna radiator so as to supply the RF signal; a switch having one end apart from the feeding line and selectively connecting one of a plurality of ports to the ground; a capacitor connected in parallel to the feeding line; a transmission line connecting the capacitor and a first port of the switch; and a first switch line connecting a second port of the switch and a second point of the antenna radiator, whereby the mounting area and the number of the switches can be reduced, and thus the manufacturing cost can be decreased and space efficiency can be improved.

Provided is a mobile terminal comprising: a case; an antenna radiator mounted in the case; a ground mounted in the case; an radio frequency (RF) signal supply unit for generating a Radio Frequency (RF) signal; a feeding line connecting the RF signal supply unit and a first point of the antenna radiator so as to supply the RF signal; a switch having one end apart from the feeding line and selectively connecting one of a plurality of ports to the ground; a capacitor connected in parallel to the feeding line; a transmission line connecting the capacitor and a first port of the switch; and a first switch line connecting a second port of the switch and a second point of the antenna radiator, whereby the mounting area and the number of the switches can be reduced, and thus the manufacturing cost can be decreased and space efficiency can be improved.

A front end module includes: a first antenna terminal; a second antenna terminal; a switch including a plurality of first side terminals on a first side and a plurality of second side terminals on a side opposite to the first side, each of the first side terminals being connected to one of the first antenna terminal and the second antenna terminal; a first filter connected to the first antenna terminal; a second filter connected to the first antenna terminal; a third filter connected to one of the second side terminals; and a fourth filter connected to one of the second side terminals. The third filter and the fourth filter are connected to one of the first antenna terminal and the second antenna terminal.

A front end module includes: a first antenna terminal; a second antenna terminal; a switch including a plurality of first side terminals on a first side and a plurality of second side terminals on a side opposite to the first side, each of the first side terminals being connected to one of the first antenna terminal and the second antenna terminal; a first filter connected to the first antenna terminal; a second filter connected to the first antenna terminal; a third filter connected to one of the second side terminals; and a fourth filter connected to one of the second side terminals. The third filter and the fourth filter are connected to one of the first antenna terminal and the second antenna terminal.