An antenna includes a first folded dipole, and a second folded dipole connected in parallel to the first folded dipole. The antenna further includes a conductor that extends across a first gap in the first folded dipole and a second gap in the second folded dipole to connect to a first central section of the first folded dipole and to a second central section of the second folded dipole.

An antenna includes a first folded dipole having a first central region, and a second folded dipole having a second central region and connected in parallel to the first folded dipole. The antenna further includes a first pair of tuning stubs extending into the first central region of the first folded dipole, and a second pair of tuning stubs extending into the second central region of the second folded dipole.

An antenna includes a first folded dipole having a first central region, and a second folded dipole having a second central region and connected in parallel to the first folded dipole. The antenna further includes a first pair of tuning stubs extending into the first central region of the first folded dipole, and a second pair of tuning stubs extending into the second central region of the second folded dipole.

An antenna structure of few components and reduced size which functions by switching between components to achieve radiation in three different frequency bands includes two radiating portions, a feeding portion, a matching circuit, and a first switching circuit. With the first switching circuit closed, current flows along a first radiating portion to activate a first frequency band. A second radiating portion obtains the current from the first switching circuit by coupling with the first radiating portion, to activate a second frequency band. Current in the first radiating portion can activate a third frequency band. With the first switching circuit open, current in the first radiating portion activates radiation in the first frequency band. The second radiating portion can radiate in second frequency band by coupling current from the first radiating portion. Frequency multiplication of the first frequency band can activate the third frequency band.

An antenna structure of few components and reduced size which functions by switching between components to achieve radiation in three different frequency bands includes two radiating portions, a feeding portion, a matching circuit, and a first switching circuit. With the first switching circuit closed, current flows along a first radiating portion to activate a first frequency band. A second radiating portion obtains the current from the first switching circuit by coupling with the first radiating portion, to activate a second frequency band. Current in the first radiating portion can activate a third frequency band. With the first switching circuit open, current in the first radiating portion activates radiation in the first frequency band. The second radiating portion can radiate in second frequency band by coupling current from the first radiating portion. Frequency multiplication of the first frequency band can activate the third frequency band.

Various embodiments provide an antenna assembly and associated systems, devices, and methods. The antenna assembly may include two or more antennas, including a first antenna and a second antenna, coupled to a ground plane. The antenna assembly may further include an isolation network coupled to the ground plane between the first and second antennas. The isolation network may include a conductive structure between conductive antenna portions of the first and second antennas, and an isolation circuit coupled between the conductive structure and the ground plane. The isolation circuit may include a resistor, an inductor, and/or a capacitor (e.g., coupled in parallel with one another). Other embodiments may be described and claimed.

An antenna and an electronic device are provided. The antenna includes a first radiator, a matching circuit, a first adjustment circuit, a signal source, and a second radiator. The first adjustment circuit is electrically connected to the matching circuit. The signal source electrically connects the matching circuit to the feed point. A gap is defined between the second radiator and the first radiator, the second radiator is coupled to the first radiator via the gap. The antenna has at least two resonant modes. Transmission/reception of electromagnetic wave signals in a middle band (MB) and a high-band (HB), in an MB of long-term evolution (LTE) and an MB of new radio (NR), or in an HB of LTE and an HB of NR is supported by the at least two resonant modes cooperatively at the same moment.

An antenna and an electronic device are provided. The antenna includes a first radiator, a matching circuit, a first adjustment circuit, a signal source, and a second radiator. The first adjustment circuit is electrically connected to the matching circuit. The signal source electrically connects the matching circuit to the feed point. A gap is defined between the second radiator and the first radiator, the second radiator is coupled to the first radiator via the gap. The antenna has at least two resonant modes. Transmission/reception of electromagnetic wave signals in a middle band (MB) and a high-band (HB), in an MB of long-term evolution (LTE) and an MB of new radio (NR), or in an HB of LTE and an HB of NR is supported by the at least two resonant modes cooperatively at the same moment.

A decoupling circuit includes: a first transmission line whose first end is connected to the first antenna element; a second transmission line whose first end is connected to the second antenna element; a first susceptance circuit whose first end is connected to a second end of the first transmission line; a second susceptance circuit whose first end is connected to a second end of the second transmission line and whose second end is connected to a second end of the first susceptance circuit; a third susceptance circuit whose first end is connected to the second end of the first susceptance circuit and whose second end is connected to the ground conductor; a first input and output terminal connected to the first end of the first susceptance circuit; and a second input and output terminal connected to the first end of the second susceptance circuit.

A decoupling circuit includes: a first transmission line whose first end is connected to the first antenna element; a second transmission line whose first end is connected to the second antenna element; a first susceptance circuit whose first end is connected to a second end of the first transmission line; a second susceptance circuit whose first end is connected to a second end of the second transmission line and whose second end is connected to a second end of the first susceptance circuit; a third susceptance circuit whose first end is connected to the second end of the first susceptance circuit and whose second end is connected to the ground conductor; a first input and output terminal connected to the first end of the first susceptance circuit; and a second input and output terminal connected to the first end of the second susceptance circuit.