An electronic device may include wireless circuitry with antennas. An antenna resonating element arm for an antenna may be formed from conductive housing structures running along the edges of the device. The antenna may have first and second antenna feeds and multiple adjustable components that bridge a slot between the antenna resonating element and an antenna ground. Control circuitry may control the adjustable components and selectively activate one of the first and second feeds at a given time to place the antenna in first, second, or third operating modes. The control circuitry may determine which operating mode to use based on information indicative of the operating environment of the device. By switching between the operating modes, the control circuitry may shift current hot spots across the length of the resonating element arm to ensure satisfactory performance of the antenna in a variety of operating conditions.

There is provided a microstrip antenna. A plurality of dielectric layers are stacked. An antenna is provided on the uppermost dielectric layer of the plurality of dielectric layers. Conductor layers are respectively provided on lower surfaces of the dielectric layers. The conductor layers have different dimensions in a plane direction thereof so that electromagnetic waves to be radiated from the conductor layers are cancelled with each other.

There is provided an antenna that includes (a) an element that emits radiation in a direction, and (b) a structure made of an electrically conductive material. The structure includes (i) a surface situated to a side of the element that is in other than the direction, and (ii) a first wall and a second wall that are situated generally perpendicular to the surface and situated with respect to one another so as to form a trough therebetween.

Circuits and antennas integrated in dies and corresponding method. The circuits and the antennas are positioned on the front surface and the back surface of the substrate respectively, but both are electrically coupled to the shared ground of the substrate. To maintain the mechanical strength of the die, some dummy metals are positioned on the back surface of the substrate and positioned around but separated away the antennas. Further, to reduce the potential side effects induced by the induced current, some ground balls are positioned on one or surfaces of the substrate.

An antenna system includes a circularly-polarized antenna element with a Down/Up ratio in a proximity of a local horizon of no better than 12 dB. An antenna radome encloses the antenna element, the radome providing a drop of antenna pattern near a local horizon and having an upper transparent area and a lower semi-transparent area. The semi-transparent area is has a generally hemispherical shape. The semi-transparent area includes a circular metallized portion with vertical and horizontal slots, the metallized portion extending part of the way downward from an equator of the generally hemispherical shape. The metallized portion includes passive discrete electrical elements connected across at least some of the slots. The metallized portion can include multiple areas having different degrees of transparence. Each such area has a specified impedance. The discrete elements are capacitors, inductors and/or resistors. The metallized portion can have a plurality of circular rows separated by the horizontal slots.

An antenna apparatus includes: an antenna array that: i) includes a plurality of antennas arranged next to each other in a predetermined direction, ii) is supplied with power from a power source, and iii) transmits radio waves; and a plurality of dummy antennas that: i) are provided on opposite sides of the antenna array in the predetermined direction, ii) are supplied with power from an electric field leaked from the antennas of the antenna array, and iii) transmit radio waves. Thus, it is possible to prevent an accuracy of detecting a target from deteriorating.

An electronic device may include wireless circuitry with antennas. An antenna resonating element arm for an antenna may be formed from conductive housing structures running along the edges of the device. The antenna may have first and second antenna feeds and multiple adjustable components that bridge a slot between the antenna resonating element and an antenna ground. Control circuitry may control the adjustable components and selectively activate one of the first and second feeds at a given time to place the antenna in first, second, or third operating modes. The control circuitry may determine which operating mode to use based on information indicative of the operating environment of the device. By switching between the operating modes, the control circuitry may shift current hot spots across the length of the resonating element arm to ensure satisfactory performance of the antenna in a variety of operating conditions.

Disclosed is an antenna desensitization system and a method for designing an antenna desensitization system. The system and method are operative to provide a configuration and positioning of an antenna desensitizer element, with respect to an antenna, to overcome a frequency detuning experienced during operation of such antenna. The antenna desensitizer element comprises one or a combination of more than one decoupling components selected from the group of a frequency selective surface, an electromagnetic band gap structure, a ferromagnetic material, an anisotropic material, a nanomaterial, a dielectric material, and a conductive material. The system and method are particularly suitable for reducing the antenna frequency detuning effects caused by an external agent, such as a user or operator of a mobile electronics device, during operation of such device.

An antenna that radiates non-dispersive and time-aligned wave-fronts at all angles of radiation (in a half space). The antenna consists of a source radiator enclosed within a metallic shield with an aperture opening to couple plane waves radiated by the source through the aperture. Pulse dispersion is eliminated by having a truly planar aperture, resulting in an abrupt radiation zone, and the aperture field distribution being uniform. Wave-front alignment is caused by the continuity of the coupled electric field lines of force onto the metallic shield to result in radiated spherical waves. The antenna transfer function is impulse-like for all angles of radiation, thus it can be considered a distortion-less antenna.

An antenna device includes a substrate, a first ground layer, a radiation electrode, and waveguide structures. Each of the waveguide structures has a slit and a conductor wall. The slit is positioned in an electric field direction of the radiation electrode and provided in the first ground layer. The conductor wall surrounds the slit and extends in a thickness direction of the substrate. A dimension of the waveguide structure in a magnetic field direction in plan view is greater than of a wavelength of a radio wave emitted by the radiation electrode in a medium of the substrate. A length from the slit to a terminal portion of the waveguide structure is about of a wavelength of the radio wave emitted by the radiation electrode in the waveguide structure.