A two-dimensional antenna includes a ground plane, a primary radiator element, and at least one switchable radiator element. The ground plane comprises an electrically conductive material and is electrically coupled to an electrical ground. The primary radiator element is disposed in a coplanar relationship to said ground plane and is electrically coupled to a signal path of a transceiver. The at least one switchable radiator element is disposed in a coplanar relationship to the ground plane and the primary radiator element and is selectably electrically couplable to one of the signal path of the transceiver and the electrical ground.

An antenna system is provided that includes at least one driven radiator element and at least one coupling device. The at least one driven radiator element is disposed above a printed circuit board. The at least one coupling device has a step feature in at least one of width and diameter. A smaller of the at least one of the width and diameter is received in at least one of a via and slot in the printed circuit board. The at least one coupling device is oriented nominally orthogonal to a plane of the printed circuit board. The at least one solder joint couples the at least one coupling device to the printed circuit board. At least one ground plane layer is electrically connected to the at least one coupling device by at least one of the solder joint and the at least one of a via and a slot.

A passive radio-frequency redirector device is provided that includes: a polarized antenna configured to produce a radiation pattern in an azimuthal plane; and a directional antenna configured to produce a directional radiation pattern that is substantially complementary to the radiation pattern of the polarized antenna, wherein the directional radiation pattern is substantially cross-polarized relative to the radiation pattern of the polarized antenna, and the polarized antenna and the directional antenna are passively coupled together.

A passive radio-frequency redirector device is provided that includes: a polarized antenna configured to produce a radiation pattern in an azimuthal plane; and a directional antenna configured to produce a directional radiation pattern that is substantially complementary to the radiation pattern of the polarized antenna, wherein the directional radiation pattern is substantially cross-polarized relative to the radiation pattern of the polarized antenna, and the polarized antenna and the directional antenna are passively coupled together.

A communication method of a wireless device to which a single radio frequency (RF) chain antenna is applied. The wireless device stores a plurality of beam sets for the single RF chain antenna and a plurality of quality values for the plurality of beam sets. The wireless device selects a first beam set having a first quality value that is a best quality value among the plurality of stored beam sets. The wireless device confirms a second quality value for the first beam set using received data when the data are received using the first beam set. The wireless device selects a second beam set different from the first beam set among the plurality of stored beam sets when the second quality value is poorer than the first quality value.

A flat antenna includes a pair of radiation units that are spaced apart from each other and that are symmetrical with respect to a symmetrical axis. Each of the radiation units includes a main radiating body, an auxiliary radiating body and a feed-in point. The main radiating body has a substantially triangular shape and includes a first angle close to the symmetrical axis, a second angle far from the symmetrical axis with respect to the first angle, and an edge between the first and second angles and obliquely facing the symmetrical axis. The auxiliary radiating body is connected to the main radiating body, and extends from the first edge toward the symmetrical axis. The feed-in point is formed on the first angle of the main radiating body.

A flat antenna includes a pair of radiation units that are spaced apart from each other and that are symmetrical with respect to a symmetrical axis. Each of the radiation units includes a main radiating body, an auxiliary radiating body and a feed-in point. The main radiating body has a substantially triangular shape and includes a first angle close to the symmetrical axis, a second angle far from the symmetrical axis with respect to the first angle, and an edge between the first and second angles and obliquely facing the symmetrical axis. The auxiliary radiating body is connected to the main radiating body, and extends from the first edge toward the symmetrical axis. The feed-in point is formed on the first angle of the main radiating body.

A vehicular antenna device including a cover, and a plurality of monopole antennas accommodated in an accommodation space formed by the cover, in which the plurality of monopole antennas is arranged in a direction intersecting a desired direction.

An antenna module is disclosed. The antenna module includes a circuit board and at least one antenna set. Wherein, the antenna set includes a driving antenna and a plurality of parasitic antennas. The driving antenna is formed on the circuit board, and the parasitic antennas are positioned with the driving antenna as a center on the circuit board. Whereby, the space occupied by the antenna module can be small, and beams of wireless signals radiated by the antenna module can be controlled.

A flat antenna includes a pair of radiation units that are spaced apart from each other and that are symmetrical with respect to a symmetrical axis. Each of the radiation units includes amain radiating body, an auxiliary radiating body and a feed-in point. The main radiating body has a substantially triangular shape and includes a first angle close to the symmetrical axis, a second angle far from the symmetrical axis with respect to the first angle, and an edge between the first and second angles and obliquely facing the symmetrical axis. The auxiliary radiating body is connected to the main radiating body, and extends from the first edge toward the symmetrical axis. The feed-in point is formed on the first angle of the main radiating body.