A helix antenna including a first radiating element extending helically about a longitudinal axis and tuned to resonate in a frequency band, a reactive element electrically connected to a first end of the first radiating element, and a second radiating element extending helically about the axis and electrically connected to the reactive element at a first end of the second radiating element, wherein the second radiating element is tuned to resonate in the frequency band.

Various embodiments provide an antenna device that includes: a metal member configured to have a length that contributes to at least a part of an electronic device; a printed circuit board (PCB) configured to be feed-connected to a preset position of the metal member in order to apply the metal member as an antenna radiator; and at least one electronic component electrically connected to a position different from the feeding position of the metal member and grounded to the PCB, and provide an electronic device that includes the same. Accordingly, the antenna device is grounded to the PCB in a desired position of the metal member by using the basically provided electronic component so that it is possible to exclude a separate electrical connection member, thereby reducing the cost, increasing the use of space, enhancing the degree of freedom of the design of the antenna radiator.

An antenna structure includes a housing, a feeding portion, and a connecting portion. The housing defines a gap and a groove. The housing forms a radiating portion and a coupling portion through the gap and the groove. A portion of the housing between the feeding portion and the gap forms a first radiating section. The connecting portion is electrically connected to one end of the coupling portion adjacent to the gap. When the feeding portion supplies current, the current flows through the feeding portion and the first radiating section, and is coupled to the connecting portion through the gap to activate a first operating mode. When the feeding portion supplies current, the current flows through the feeding portion and the first radiating section, and is coupled to the coupling portion through the gap to activate a second operating mode.

Antenna structures and methods of operating the same are described. One apparatus includes a radio frequency (RF) circuitry, a housing, an antenna structure, and multi-connector switching circuitry. The RF circuitry includes a first RF feed for a first frequency and a second RF feed for a second frequency. The housing includes a first strip element disposed at a periphery of the housing, where the first strip element is physically separated from the housing by a first cutout in the housing. The antenna structure includes the first strip element with a first connector, a second connector, and a third connector coupled to the multi-connector switching circuitry. The multi-connector switching circuitry connects the first RF feed coupled to the first RF feed and the second RF feed where the first switching circuit to connect the first strip element to the first RF feed in a first mode of the first multi-connector switching circuitry.

An apparatus (10) comprising a substrate (2) and an antenna (20). The antenna (20) comprising a first conductive element (21) having a first electrical length and connected to a first antenna terminal (31) and a second conductive element (22) having a second electrical length connected to a second antenna terminal (32), wherein at least the first conductive element is supported by a first portion of the substrate (11) and wherein at least the first portion of the substrate is configured to deform from a first configuration to a second configuration to: change the first electrical length of the first conductive element relative to the second electrical length of the second conductive element; and add or remove at least one operational resonant mode of the antenna.

A mobile terminal can include a terminal body having a display unit disposed on one surface thereof; a frame supporting the display unit; a metal member spaced apart from the frame and exposed to an outside of the mobile terminal; a plurality of connecting members connecting the metal member to the frame and grounding the metal member; and an antenna unit disposed adjacent to the frame and including a radiator configured to radiate wireless signals in a first frequency band, in which the metal member is divided into specific areas by the plurality of connecting members, and one area located adjacent to the radiator, is configured to generate a parasitic resonance at a second frequency band different from the first frequency band, and the plurality of connecting members connected to the metal member are spaced apart from one another at different intervals.

Adaptive self-tunable antenna systems and methods are provided including a closed-loop system for sensing near-field RF signals of transmitted RF signals and tuning an antenna or switching between multiple antennas, so that the strength of the transmitted RF signals is maximized. A sensing antenna detects the near-field RF signal, which is filtered and converted to an RF strength control signal that can be used to generate an antenna tuning control signal. An antenna tuner uses the antenna tuning control signal to keep the antenna in resonance by dynamically changing the electrical length of the antenna or switching between multiple antennas to maximize the strength of the radiated RF signal. Such antennas may be less prone to detuning due to interaction with human bodies or other objects. Dynamically matching the antennas to an RF power amplifier and low noise amplifier can improve stability, power efficiency, gain, noise figure, and receiver sensitivity.

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.

An antenna structure includes a housing, a feed source, a connecting portion and a coupling portion. The housing defines a slot. The slot divides the housing into a radiating portion and a grounding portion. The grounding portion is grounded. The feed source is electrically connected to the radiating portion for supplying current to the radiating portion. The connecting portion has one end electrically connected to the radiating portion and another end electrically connected to the grounding portion for grounding the radiating portion. The coupling portion has one end electrically connected to the grounding portion and another end spaced apart from the radiating portion.

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.