An antenna of an electronic device is provided, which includes a radiator including at least part of a metal housing of the electronic device; a capacitor connected to the radiator; a feeding part connected to the radiator; and a ground part connected to the capacitor.

A radio frequency (RF) antenna unit is described. The RF antenna unit includes a feed portion, at least first and second selective grounding portions each configured to selectively enable or disable an electrical coupling to a substrate, and at least first and second conductive arms. The first conductive arm provides electrical conduction between the feed portion and the first grounding portion, extending from the first grounding portion towards and beyond the feed portion. The second conductive arm provides electrical conduction between the feed portion and the second grounding portion, extending from the second grounding portion towards and beyond the feed portion. First and second inverted F antenna (IFA) elements are defined by the feed portion, the respective first or second grounding portion and the respective first or second conductive arm. The feed portion is common to both the first and second IFA elements.

A multi-layer software controlled antenna. A radiating patch is provided over a variable dielectric constant (VDC) plate. Variable DC potential is applied across the VDC plate to control the effective dielectric constant at various locations of the VDC plate. RF signal is coupled between a feed patch and a delay line, and the delay line couples the RF signal to the radiating patch. The radiating patch, VDC plate, delay line, and feed patch are each provided at a different layer of the antenna, so as to decouple the RF and DC signal paths. A controller executes a software program to thereby control the variable DC potential applied across the VDC plate, thereby controlling the operational characteristics of the 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.

The present disclosure relates to the field of antenna technologies and, in particular, to an antenna system and a mobile terminal. The antenna system includes: a metal rear cover, a first feeding point, and a system ground, wherein a U-shaped slot is arranged at a bottom of the metal rear cover, and the U-shaped slot divides the metal rear cover into a radiation portion and a grounding portion, the grounding portion is connected to the system ground, the radiation portion includes a first end and a second end, and both the first end and the second end are connected to the grounding portion, a break is defined at the radiation portion, and the radiation portion is electrically connected to the first feeding point, so as to form a main antenna.

A multi-band helix antenna including one or more first arms extending helically about an axis at a first distance from the axis; and one or more second arms extending helically about the axis at a second distance from the axis that is greater than the first distance, wherein each of the one or more second arms comprises at least one trap circuit configured to have a first impedance at a resonant frequency of the one or more first arms and a second impedance at a resonant frequency of the one or more second arms, and the first impedance is greater than the second impedance.

An electronic device may include antennas, a ground, and a housing. First and second gaps in the housing may define a segment that forms a resonating element for a first antenna. First, second, third, and fourth antenna feeds may be coupled between the segment and ground. Control circuitry may control adjustable components to place the device in first, second, third, or fourth modes. In the first and second modes, the first and fourth feeds convey signals at the same frequency using a multiple-input and multiple-output scheme while the second and third feeds are inactive. In the third mode, the second feed is active and the first, third, and fourth feeds are inactive. In the fourth mode, the third feed is active and the first, second, and fourth antenna feeds are inactive. Isolating return paths may be coupled between the segment and ground in the first and second modes.

A technique is provided for tuning the resonance frequency of an electric-based antenna formed by a radiator element coupled to an antenna ground plane. The disclosed method comprises providing a plurality of parasitic capacitive elements extending in an electric field direction of the electric-based antenna so as to lower the resonance frequency of the electric-based antenna below a desired resonance frequency. The electric-based antenna is then integrated within a deployment environment of interest, and thereafter an indication of an actual frequency response of the electric-based antenna within the deployment environment is obtained. One or more of the parasitic capacitive elements may then be removed so as to adjust the actual resonance frequency towards the desired resonance frequency. By such an approach, a significant degree of adjustment in the resonance frequency of the antenna can be made after the antenna has been integrated within the deployment environment.

A Frequency-tunable and slot-fed planar antenna is proposed. The antenna includes resonant patch, a first dielectric layer, a ground plane having a first slot for each linear polarization, a second dielectric layer and a transmission line having, for each first slot, an end strand extending beneath the first slot. The antenna is frequency tunable for each linear polarization through at least one variable capacitance element. The matching of the antenna varies, for each linear polarization, as a function of a bias voltage applied to the variable capacitance element(s). The antenna includes, for each linear polarization, at least one second slot extending along the first slot. The end strand of the transmission line extends between the first slot and second slots. The at least one second slot creates an additional resonance.

A multi-layer software controlled antenna. A radiating patch is provided over a variable dielectric constant (VDC) plate. Variable DC potential is applied across the VDC plate to control the effective dielectric constant at various locations of the VDC plate. RF signal is coupled between a feed patch and a delay line, and the delay line couples the RF signal to the radiating patch. The radiating patch, VDC plate, delay line, and feed patch are each provided at a different layer of the antenna, so as to decouple the RF and DC signal paths. A controller executes a software program to thereby control the variable DC potential applied across the VDC plate, thereby controlling the operational characteristics of the antenna.