An antenna structure includes a housing and at least one switching circuit. The housing includes a border frame made of metal including at least one gap dividing the border frame into at least two radiating portions. The at least one switching circuit is mounted to the at least one gap and electrically coupled to the at least two radiating portions on opposite sides of the at least one switching circuit. The at least one switching circuit is controlled to switch between an open circuit state and a closed circuit state. A length of the at least two radiating portions is changed by the at least one switching circuit switched between the open circuit state and the closed circuit state to adjust a bandwidth of the antenna structure.

An antenna structure includes a housing and at least one switching circuit. The housing includes a border frame made of metal including at least one gap dividing the border frame into at least two radiating portions. The at least one switching circuit is mounted to the at least one gap and electrically coupled to the at least two radiating portions on opposite sides of the at least one switching circuit. The at least one switching circuit is controlled to switch between an open circuit state and a closed circuit state. A length of the at least two radiating portions is changed by the at least one switching circuit switched between the open circuit state and the closed circuit state to adjust a bandwidth of the antenna structure.

The antenna system includes: an upper frame, including a feeding point, a ground point, and a connection ground, wherein the ground point is arranged between the feeding point and the connection ground; system ground; feed source; matching network, including a first-order band elimination filter and a first capacitor that are connected in series; and first inductor. The upper frame is disposed at one side periphery of the system ground, and a clearance region is formed between the system ground and the upper frame. The feed source is connected to the feeding point through the matching network, the ground point is connected to the system ground through the first inductor, and the connection ground is connected to the system ground, so as to form a GPS antenna, a WIFI 2.4G antenna and a WIFI 5G antenna.

The antenna system includes: an upper frame, including a feeding point, a ground point, and a connection ground, wherein the ground point is arranged between the feeding point and the connection ground; system ground; feed source; matching network, including a first-order band elimination filter and a first capacitor that are connected in series; and first inductor. The upper frame is disposed at one side periphery of the system ground, and a clearance region is formed between the system ground and the upper frame. The feed source is connected to the feeding point through the matching network, the ground point is connected to the system ground through the first inductor, and the connection ground is connected to the system ground, so as to form a GPS antenna, a WIFI 2.4G antenna and a WIFI 5G antenna.

In an antenna circuit including an antenna 1 and an antenna 2 that is connected in series with the antenna 1 and includes inductance, a variable capacitor C.sub.v and a variable resistor R.sub.v connected in parallel with the antenna 2 are provided. This enables controlling of an actual amplitude ratio r and a phase difference between currents I.sub.1 and I.sub.2 flowing through the two antennas 1 and 2 into desired values. Flows of the currents I.sub.1 and I.sub.2 with the phase difference through the antennas 1 and 2 enable forming of a favorable communication area. In addition, setting of the actual amplitude ratio r between the currents I.sub.1 and I.sub.2 flowing through the antennas 1 and 2 to a value other than 1 enables forming of an asymmetric communication area.

In an antenna circuit including an antenna 1 and an antenna 2 that is connected in series with the antenna 1 and includes inductance, a variable capacitor C.sub.v and a variable resistor R.sub.v connected in parallel with the antenna 2 are provided. This enables controlling of an actual amplitude ratio r and a phase difference between currents I.sub.1 and I.sub.2 flowing through the two antennas 1 and 2 into desired values. Flows of the currents I.sub.1 and I.sub.2 with the phase difference through the antennas 1 and 2 enable forming of a favorable communication area. In addition, setting of the actual amplitude ratio r between the currents I.sub.1 and I.sub.2 flowing through the antennas 1 and 2 to a value other than 1 enables forming of an asymmetric communication area.

An antenna includes: a first substrate and a second substrate; a first antenna electrode is disposed on a side of the first substrate away from the second substrate; a second antenna electrode is disposed on a side of the second substrate away from the first substrate and a microstrip line is disposed on a side of the second substrate close to the first substrate; a liquid crystal layer is disposed between the first substrate and the second substrate; at least one drive electrode assembly is disposed between the first substrate and the second substrate. The at least one drive electrode assembly is configured to achieve impedance matching of the antenna by controlling liquid crystal molecules of the liquid crystal layer to deflect.

According to aspects of the disclosure, a multi-feed multi-band MIMO antenna system comprises at least two antennas orthogonally positioned with respect to each other, which are operating over two different frequency ranges; at least two out-of-band resonators coupled with the two antennas respectively; and, at least two other in-band resonators coupled with the two antennas respectively and designed to decrease mutual coupling in the frequency ranges, where the first resonator filters out signals having the second frequency range leaking into a first antenna, while the second resonator filters out other signals having the first frequency range leaking into a second antenna.

A radio system supporting 2.4 GHz operation, 5 GHz operation, and dual simultaneous 2.4 GHz/5 GHz operation includes one or more radios; and a plurality of antenna systems connected to the one or more radios via a plurality of switches, wherein each of the plurality of antenna systems includes an antenna element including a first end and a second end; a terminating network connecting the first end to ground; and a matching network connecting the second end to an antenna port which is communicatively coupled to one or more radios, wherein the antenna element operates as one of a quarter wave, a half wave, based on first settings in the terminating network and the matching network, and wherein the one or more radios are selectively connected to the plurality of antenna systems based on second settings of the plurality of switches.

A terminal includes a conductive substrate and a printed circuit board that are disposed opposite to each other, a first slot is disposed in a direction from a first side edge of the conductive substrate to a center of the conductive substrate, and a projection of the printed circuit board on the conductive substrate is located inside the conductive substrate, and a first feeder is disposed inside the first slot, a first connection end of the first feeder is coupled to a lap joint of the first side edge, a second connection end of the first feeder is coupled to a first feeding source on the printed circuit board, and projections of the lap joint of the first side edge and the first feeding source on the conductive substrate are located on two sides of the first slot.