A radiofrequency transmitter comprises a negative impedance converter having an input port and an output port; a first antenna electrically coupled to the input port of said negative impedance converter and operatively configured to emit electromagnetic radiation of a first polarization; and a second antenna electrically coupled to the output port of the negative impedance converter and operatively configured to emit electromagnetic radiation of a second polarization. The radiofrequency transmitter is operatively configured to emit an oscillating signal having a first frequency.

An antenna structure includes a first ground element, a feeding element, a shorting element, a parasitic tuning element, a second ground element, a first parasitic element, a second parasitic element, and a dielectric substrate. The feeding element is coupled through the shorting element to the first ground element. The parasitic tuning element is coupled to the first ground element. The parasitic tuning element is at least partially surrounded by the feeding element, the shorting element, and the first ground element. The second ground element is adjacent to the feeding element. The first parasitic element and the second parasitic element are coupled to the second ground element. The feeding element, the shorting element, the parasitic tuning element, the first parasitic element, the second parasitic element, and at least one of the first ground element and the second ground element are disposed on the dielectric substrate.

An antenna structure includes a first ground element, a feeding element, a shorting element, a parasitic tuning element, a second ground element, a first parasitic element, a second parasitic element, and a dielectric substrate. The feeding element is coupled through the shorting element to the first ground element. The parasitic tuning element is coupled to the first ground element. The parasitic tuning element is at least partially surrounded by the feeding element, the shorting element, and the first ground element. The second ground element is adjacent to the feeding element. The first parasitic element and the second parasitic element are coupled to the second ground element. The feeding element, the shorting element, the parasitic tuning element, the first parasitic element, the second parasitic element, and at least one of the first ground element and the second ground element are disposed on the dielectric substrate.

In accordance with some embodiments, an automatically tunable mobile antenna is provided with toroidal inductors connected in series between the antenna feed point and a whip and a shunt inductor to ground at the RF input, with the inductors forming an L network impedance matching circuit having values which are in a binary sequence and which are selectively added to impedance match the whip to the output impedance of a transmitter. In accordance with some embodiments, an automatically tunable mobile antenna is provided with a variable toroidal inductor assembly connected between the antenna feed point and the whip having a variable inductance based on selective shorting and un-shorting of wire windings to impedance match the whip to the output impedance of the transmitter.

In accordance with some embodiments, an automatically tunable mobile antenna is provided with toroidal inductors connected in series between the antenna feed point and a whip and a shunt inductor to ground at the RF input, with the inductors forming an L network impedance matching circuit having values which are in a binary sequence and which are selectively added to impedance match the whip to the output impedance of a transmitter. In accordance with some embodiments, an automatically tunable mobile antenna is provided with a variable toroidal inductor assembly connected between the antenna feed point and the whip having a variable inductance based on selective shorting and un-shorting of wire windings to impedance match the whip to the output impedance of the transmitter.

An electronic device includes a first antenna radiator configured to transmit or receive a signal of a first frequency band and a signal of a second frequency band, a second antenna radiator configured to transmit or receive the signal of the second frequency band, a matching circuit mismatched with the second antenna radiator in the first frequency band and matched with the second antenna radiator in the second frequency band, a radio frequency circuit electrically connected to the first antenna radiator and the second antenna radiator, and a processor configured to control the RF circuit such that the signal of the second frequency band is transmitted or received through the first antenna radiator and the second antenna radiator in a multi-input multi-output mode or such that the signal of the first frequency band is transmitted or received through the first antenna radiator in a single input single output mode.

An electronic device includes a first antenna radiator configured to transmit or receive a signal of a first frequency band and a signal of a second frequency band, a second antenna radiator configured to transmit or receive the signal of the second frequency band, a matching circuit mismatched with the second antenna radiator in the first frequency band and matched with the second antenna radiator in the second frequency band, a radio frequency circuit electrically connected to the first antenna radiator and the second antenna radiator, and a processor configured to control the RF circuit such that the signal of the second frequency band is transmitted or received through the first antenna radiator and the second antenna radiator in a multi-input multi-output mode or such that the signal of the first frequency band is transmitted or received through the first antenna radiator in a single input single output mode.

Disclosed is an electronic device. The electronic device according to an embodiment includes an antenna element configured to receive a signal in at least one frequency band of a first frequency band and a second frequency band, a signal distributor electrically connected with the antenna element, and including a first filter corresponding to the first frequency band and a second filter corresponding to the second frequency band, a matching circuit electrically connectable with the second filter, a transceiver electrically connected with the signal distributor, a switch connecting the second filter with the matching circuit or the transceiver, and a processor electrically connected with the transceiver. Moreover, various embodiments found through the present disclosure are possible.

An electronic device including an antenna is provided. The electronic device includes a first antenna radiator that resonates in a first band, a second antenna radiator that resonates in second and third bands higher than the first band, a third antenna radiator that resonates in the second and third bands, a communication circuit, a first feeding part electrically connecting the communication circuit and the first antenna radiator, a second feeding part electrically connecting the communication circuit and the second antenna radiator, and a third feeding part electrically connecting the communication circuit and the third antenna radiator. The communication circuit receives a signal in the second band while transmitting and receiving a signal in the second band by using the second antenna radiator and receives a signal in the third band while transmitting and receiving a signal in the third band using the third antenna radiator.

An electronic device including an antenna is provided. The electronic device includes a first antenna radiator that resonates in a first band, a second antenna radiator that resonates in second and third bands higher than the first band, a third antenna radiator that resonates in the second and third bands, a communication circuit, a first feeding part electrically connecting the communication circuit and the first antenna radiator, a second feeding part electrically connecting the communication circuit and the second antenna radiator, and a third feeding part electrically connecting the communication circuit and the third antenna radiator. The communication circuit receives a signal in the second band while transmitting and receiving a signal in the second band by using the second antenna radiator and receives a signal in the third band while transmitting and receiving a signal in the third band using the third antenna radiator.