According to certain embodiments, an electronic device comprises: a first housing including a plurality of conductive portions electrically separated from each other and disposed on at least a portion of a side surface of the first housing; a second housing slidably coupled to the first housing; a flexible display supported by the first housing and the second housing and having a display area that is changable by sliding the second housing; and a wireless communication circuit disposed in the first housing and configured to transmit and receive wireless signals in a plurality of frequency bands via the plurality of conductive portions, wherein the plurality of conductive portions includes a first conductive portion and a second conductive portion, wherein the first conductive portion and the second conductive portion have a U shape or C shape and are electrically separated from each other, and wherein the first conductive portion is spaced apart from the first housing.

According to certain embodiments, an electronic device comprises: a first housing including a plurality of conductive portions electrically separated from each other and disposed on at least a portion of a side surface of the first housing; a second housing slidably coupled to the first housing; a flexible display supported by the first housing and the second housing and having a display area that is changable by sliding the second housing; and a wireless communication circuit disposed in the first housing and configured to transmit and receive wireless signals in a plurality of frequency bands via the plurality of conductive portions, wherein the plurality of conductive portions includes a first conductive portion and a second conductive portion, wherein the first conductive portion and the second conductive portion have a U shape or C shape and are electrically separated from each other, and wherein the first conductive portion is spaced apart from the first housing.

A system and method for tuning a transistor-based circuit. The system includes a negative impedance converter circuit having a capacitor, a first transistor, and a second transistor. As a current travels through the capacitor, the first transistor and the second transistor each sample voltage at the capacitor and invert the voltage at an input of the negative impedance converter circuit. The negative impedance converter circuit also has a third transistor in series with the capacitor. The third transistor has a base voltage. Changing the base voltage of the third transistor changes the voltage sampled by the first transistor and the second transistor.

The present disclosure provides an antenna circuit and a mobile terminal. The antenna circuit includes: an antenna unit; a switching circuit connection point and a feed point are arranged on the antenna unit; an antenna feed is connected with the feed point; a first tuning circuit is connected with the switching circuit connection point, the first tuning circuit is configured to increase a bandwidth of a single resonant mode in an intermediate-high frequency and/or to tune a resonant frequency in the intermediate-high frequency; wherein a distance from the feed point to the end of the antenna unit is larger than a distance from the switching circuit connection point to the end of the antenna unit.

The present disclosure provides an antenna circuit and a mobile terminal. The antenna circuit includes: an antenna unit; a switching circuit connection point and a feed point are arranged on the antenna unit; an antenna feed is connected with the feed point; a first tuning circuit is connected with the switching circuit connection point, the first tuning circuit is configured to increase a bandwidth of a single resonant mode in an intermediate-high frequency and/or to tune a resonant frequency in the intermediate-high frequency; wherein a distance from the feed point to the end of the antenna unit is larger than a distance from the switching circuit connection point to the end of the antenna unit.

An electronic device is provided. The electronic device includes a communication circuit including at least one antenna, a memory, and a processor operatively connected with the communication circuit and the memory. The memory includes instructions, when executed, causing the processor to identify a communication state of the communication circuit, adjust a characteristic of the antenna to a wideband characteristic including a first wireless-fidelity (Wi-Fi) band and a second Wi-Fi band by means of the communication circuit to scan a Wi-Fi communication channel, when the identified communication state is a state where the Wi-Fi communication channel is scanned, and adjust the characteristic of the antenna to a narrowband characteristic corresponding to a determined communication channel to perform Wi-Fi communication, when the identified communication state is a state where the Wi-Fi communication channel to communicate is determined.

An antenna structure and a wireless communication device having the antenna structure are provided, the antenna structure includes a metal frame, a feeding portion, a first ground portion, and a second ground portion. The metal frame defines a first gap, a second gap, and a third gap, the metal frame between the first gap and the second gap forms a first radiating portion, the metal frame between the first gap and the third gap and the metal frame on a side of the third gap cooperatively form a second radiating portion, the metal frame on a side of the second gap forms a third radiating portion. The feeding portion is connected to the first radiating portion. The first ground portion is apart from the feeding portion and connected to the first radiating portion. The second ground portion closes to the second gap and is connected to the third radiating portion.

An antenna structure and a wireless communication device having the antenna structure are provided, the antenna structure includes a metal frame, a feeding portion, a first ground portion, and a second ground portion. The metal frame defines a first gap, a second gap, and a third gap, the metal frame between the first gap and the second gap forms a first radiating portion, the metal frame between the first gap and the third gap and the metal frame on a side of the third gap cooperatively form a second radiating portion, the metal frame on a side of the second gap forms a third radiating portion. The feeding portion is connected to the first radiating portion. The first ground portion is apart from the feeding portion and connected to the first radiating portion. The second ground portion closes to the second gap and is connected to the third radiating portion.

An electronic device is provided. The electronic device includes a housing structure including a first housing and a second housing connected to first housing, the second housing being connected to the first housing so as to be slidable while being at least partially inserted into or withdrawn from the first housing, a sensor module including at least one sensor, an antenna, an antenna tuner electrically connected to the antenna and configured to match impedance of the antenna, and a processor operatively connected to the sensor module, the antenna, and the antenna tuner, wherein the processor is configured to determine withdrawal information about a withdrawn degree of the second housing by using the sensor module, select an index corresponding to the withdrawal information from among multiple indices in which impedance values of the antenna according to multiple different pieces of withdrawal information are sampled, and control, based on a tuning code corresponding to the selected index, the antenna tuner to activate or deactivate at least some among at least one of one or more capacitors or one or more inductors included in the antenna tuner, so as to match the impedance of the antenna.

An antenna includes a first radiating element configured to emit first electromagnetic radiation in response to at least one feed signal having a frequency within a first radio frequency (RF) band. A director is provided, which is positioned forwardly of the first radiating element, and in a path of the first electromagnetic radiation. The director includes first and second passive impedance elements that provide respective first and second frequency-dependent reactances to first currents induced within the director in response to the first electromagnetic radiation. The first and second passive impedance elements may include a first inductor and a first capacitor, which are electrically coupled in series. The director may also be configured to include a plurality of passive impedance elements that are connected within an impedance loop containing a second LC circuit in series with a first LC circuit.