The present subject matter relates to positioning monopole antennas on a ground plane of a mobile device, the ground plane having a tapered edge near where the monopole is positioned. By placing the monopole near the tapered edge, the radiation pattern of the monopole is directed, at least partially, laterally towards the tapered edge. In some embodiments, a reflector is on the ground plane, where the monopole is between the reflector and the tapered edge. The reflector is configured to further direct radiation from the monopole towards the monopole antenna and tapered edge.

The present subject matter relates to systems, devices, and methods for controlling the directional gain of an antenna. in some embodiments, an antenna for wireless communications includes a monopole antenna element and at least one passive beam-steering element that is spaced apart from the monopole antenna element. The at least one passive beam-steering element is configured to steer a signal beam from the monopole antenna element in a direction substantially orthogonal to the monopole antenna element.

A technique is described wherein one or multiple reflectors are integrated into a wideband antenna to provide directional radiation pattern characteristics across the frequency range serviced by the antenna. Distributed filters are designed into the reflector assembly to alter electrical performance as a function of frequency. The directive properties provided by the reflector assembly can be adjusted at specific frequency bands to provide a more or less directive radiation pattern. The reflector assembly is designed to maintain low Passive Intermodulation (PIM) characteristics making the technique applicable to high quality Distributed Antenna Systems (DAS) and other applications which require low PIM levels and/or a radiation pattern that can be controlled as a function of frequency.

A pattern reconfigurable antenna includes a radiator, a first parasitic element, a second parasitic element, a ground plane, a first switch and a second switch. The radiator includes a feed portion and a radiating portion that are interconnected. The first and second parasitic elements are symmetrically located at two opposite sides of the radiating portion, and are closely adjacent to and spaced apart from the radiating portion. The ground plane is located at another side of the radiating portion, and is spaced apart from the first and second parasitic elements. Each of the first and second switches is connected between the ground plane and a respective one of the first and second parasitic elements, and is operable to establish connection between the same.

An antenna comprising: a radio frequency (RF) coupler; a transceiver communicatively coupled to the RF coupler; a laser configured to generate a plurality of femtosecond laser pulses so as to create, without the use of high voltage electrodes, a laser-induced plasma filament (LIPF) in atmospheric air, wherein the laser is operatively coupled to the RF coupler such that RF energy is transferred between the LIPF and the RF coupler; and wherein the laser is configured to modulate a characteristic of the laser pulses at a rate within the range of 1 Hz to 1 GHz so as to modulate a conduction efficiency of the LIPF thereby creating a variable impedance LIPF antenna.

An antenna device comprises a substrate with an installation surface, with said substrate configured to electrically connect to a ground point; a main antenna connected to the installation surface, wherein the main antenna extends away from the installation surface, has a feeding end for receiving a signal, and is configured to form a resonance current path with the substrate to generate an original radiation field; and a reflector with a shorting end and a free end, wherein the shorting end connects to the installation surface and the reflector extends away from the installation surface; and a switch with a first end, a second end, and a control end, wherein the first end electrically connects to the free end of the reflector, the second end electrically connects to the substrate, and the control end is configured to selectively control the first end and the second end in a conductive connection.

An antenna includes a feeding element and at least one non-feeding element. A vertical distance between each non-feeding element and the feeding element falls within a specified threshold, each non-feeding element includes a first conductor that is grounded, a regulator circuit, and a control switch disposed on the first conductor and configured to control the regulator circuit, where the regulator circuit is configured to regulate a current path length of the non-feeding element. The non-feeding element forms a reflector when the regulator circuit is enabled, or the non-feeding element forms a director when the regulator circuit is disabled. A design in which the reflector and the director are compatible is used such that a combination of one feeding element, M directors and N reflectors is implemented for the antenna to achieve a high directive gain and interference suppression capability.

An antenna includes a feeding element and at least one non-feeding element. A vertical distance between each non-feeding element and the feeding element falls within a specified threshold, each non-feeding element includes a first conductor that is grounded, a regulator circuit, and a control switch disposed on the first conductor and configured to control the regulator circuit, where the regulator circuit is configured to regulate a current path length of the non-feeding element. The non-feeding element forms a reflector when the regulator circuit is enabled, or the non-feeding element forms a director when the regulator circuit is disabled. A design in which the reflector and the director are compatible is used such that a combination of one feeding element, M directors and N reflectors is implemented for the antenna to achieve a high directive gain and interference suppression capability.

The invention relates to a surface wave antenna system, comprising at least one antenna that is electrically short in the vertical plane, with vertical or elliptic polarization and emitting a radiation, said antenna being linked to a conducting medium exhibiting a substantially horizontal surface. The antenna system being characterized in that it comprises furthermore at least one parasitic wire extending in a direction substantially parallel to the surface of the conducting medium, electrically insulated from each antenna, and arranged in the vicinity of at least one antenna in such a way as to be able to radiate by virtue of the current induced by said radiation of this antenna. The invention makes it possible to combine the resultants of each radiating element in such a way as to control the radiation pattern in the vertical plane.

The invention relates to a surface wave antenna system, comprising at least one antenna that is electrically short in the vertical plane, with vertical or elliptic polarization and emitting a radiation, said antenna being linked to a conducting medium exhibiting a substantially horizontal surface. The antenna system being characterized in that it comprises furthermore at least one parasitic wire extending in a direction substantially parallel to the surface of the conducting medium, electrically insulated from each antenna, and arranged in the vicinity of at least one antenna in such a way as to be able to radiate by virtue of the current induced by said radiation of this antenna. The invention makes it possible to combine the resultants of each radiating element in such a way as to control the radiation pattern in the vertical plane.