An antenna includes at least one dipole antenna comprising a pair of monopole antennas each monopole antenna includes an adjustable conductive element with one end electrically combined to an inductor and another end combined to an insulator. A support structure combined to the at least one dipole antenna positions one end of each monopole at an elevation higher than the other end of the monopole.

A multiband antenna includes a first radiator, a feed element, a first ground element, a second radiator, a connecting element, and a second ground element, wherein the first radiator is made of a metal plate. The feed element is electrically connected to the first radiator and is adapted to feed a signal. The first ground element is electrically connected to the first radiator. The second radiator is made of a metal plate and surrounds an outer side of the first radiator, wherein the first radiator and the second radiator are spaced by an interval. The connecting element is electrically connected to the first radiator and the second radiator. The second ground element is electrically connected to the second radiator. In this way, the multiband antenna is suitable for transmitting signals in multiple frequency bands.

A multiband antenna includes a first radiator, a feed element, a first ground element, a second radiator, a connecting element, and a second ground element, wherein the first radiator is made of a metal plate. The feed element is electrically connected to the first radiator and is adapted to feed a signal. The first ground element is electrically connected to the first radiator. The second radiator is made of a metal plate and surrounds an outer side of the first radiator, wherein the first radiator and the second radiator are spaced by an interval. The connecting element is electrically connected to the first radiator and the second radiator. The second ground element is electrically connected to the second radiator. In this way, the multiband antenna is suitable for transmitting signals in multiple frequency bands.

A dual band antenna for a first frequency range and a second frequency range includes a first radiator for the first frequency range as well as a second radiator for the second frequency range. The dual band antenna also includes a ground conductor as an antipole to the first and second radiators. The first radiator and the second radiator join in a V shape at a base of the dual band antenna. A domestic appliance including a communication unit which has a dual band antenna is also provided.

A dual band antenna for a first frequency range and a second frequency range includes a first radiator for the first frequency range as well as a second radiator for the second frequency range. The dual band antenna also includes a ground conductor as an antipole to the first and second radiators. The first radiator and the second radiator join in a V shape at a base of the dual band antenna. A domestic appliance including a communication unit which has a dual band antenna is also provided.

An apparatus including a dipole antenna, configured for operation with a first polarization, the dipole antenna including a feed; and a pair of conductive elements fed by the feed, wherein the pair of conductive elements are grounded, and extend in parallel on opposing sides of the feed and then diverge.

A radiator includes a radiation substrate on which a dipole radiator configured to radiate a signal having a polarization of +45 and a signal having a polarization of 45 is formed, a first transmission line substrate vertically coupled to the radiation substrate and having a first transmission line and a second transmission line, formed thereon, a second transmission line substrate that is vertically coupled to the radiation substrate, is spaced parallel to the first transmission line substrate, and has a third transmission line, and a fourth transmission line, formed thereon, and a distribution circuit board vertically coupled to the first transmission line substrate and the second transmission line substrate and configured to provide the signal having a polarization of +45 and the signal having a polarization of 45 to the first to fourth transmission lines.

A radiator includes a radiation substrate on which a dipole radiator configured to radiate a signal having a polarization of +45 and a signal having a polarization of 45 is formed, a first transmission line substrate vertically coupled to the radiation substrate and having a first transmission line and a second transmission line, formed thereon, a second transmission line substrate that is vertically coupled to the radiation substrate, is spaced parallel to the first transmission line substrate, and has a third transmission line, and a fourth transmission line, formed thereon, and a distribution circuit board vertically coupled to the first transmission line substrate and the second transmission line substrate and configured to provide the signal having a polarization of +45 and the signal having a polarization of 45 to the first to fourth transmission lines.

Antenna systems for receiving transmitted signals comprising at least a first tuned antenna disposed in a known relationship spatially with a second antenna, with the first tuned antenna electrically connected to the second antenna, are disclosed. The antenna system may be configured to allow the antennas to reliably discriminate between left-hand and right-hand circular signals.

A radar array comprising a panel, the panel comprising a top side and a bottom side; a plurality of high-frequency antennas coupled into a high-frequency array coupled to the panel; at least one low-frequency resistive vee dipole transmitting antenna; and at least one low-frequency resistive vee dipole receiving antenna, wherein the at least one low-frequency resistive vee dipole transmitting antenna and the at least one low-frequency resistive vee dipole receiving antenna are coupled into a low-frequency array.