Twin-beam base station antennas are provided. A twin-beam base station antenna includes a plurality of vertical columns of radiating elements that are configured to transmit radio frequency signals in a frequency band. The radiating elements have bent metal radiator arms including tip portions that face respective center axes of the radiating elements.

Twin-beam base station antennas are provided. A twin-beam base station antenna includes a plurality of vertical columns of radiating elements that are configured to transmit radio frequency signals in a frequency band. The radiating elements have bent metal radiator arms including tip portions that face respective center axes of the radiating elements.

An antenna device installed in a vehicle includes a stacked dipole antenna unit. The stacked dipole antenna unit has a plurality of dipole antennas that are arranged parallel to a plane perpendicular to a front-back direction of the vehicle.

Apparatus and systems for antennas for endfire radiation with vertical polarization are described. In an embodiment, an antenna includes a top patch, a ground substrate defining a hole, a feeding cable disposed to mate with the hole, two coupled radiating resonant cavities having two eigen-modes, where the coupled radiating resonant cavities are configured to form a beam, and where the antenna is configured for endfire radiation with vertical polarization.

Apparatus and systems for antennas for endfire radiation with vertical polarization are described. In an embodiment, an antenna includes a top patch, a ground substrate defining a hole, a feeding cable disposed to mate with the hole, two coupled radiating resonant cavities having two eigen-modes, where the coupled radiating resonant cavities are configured to form a beam, and where the antenna is configured for endfire radiation with vertical polarization.

An antenna structure includes a dipole antenna element and a floating metal element. The floating metal element is disposed adjacent to the dipole antenna element. The vertical projection of the dipole antenna element at least partially overlaps the floating metal element. The floating metal element is configured for fine-tuning the radiation pattern of the antenna structure and to increase the operation bandwidth of the antenna structure.

An antenna structure includes a dipole antenna element and a floating metal element. The floating metal element is disposed adjacent to the dipole antenna element. The vertical projection of the dipole antenna element at least partially overlaps the floating metal element. The floating metal element is configured for fine-tuning the radiation pattern of the antenna structure and to increase the operation bandwidth of the antenna structure.

An antenna comprising at least one antenna bay comprising an input port; a feed network and a radiative component is provided. The feed network has a center node connected to the input port; a printed circuit board (PCB), comprising an active surface having at least two feed micro-strips and a reference surface having at least two first reference micro-strips, the reference surface being opposite to the active surface. The radiative component has at least two dipoles, each of the at least two dipoles being shaped as a helix and being uniformly disposed about an antenna axis, each of the at least two dipoles comprising a dipole feeded portion connected to one of the at least two feed micro-strips and a dipole reference portion connected to one of the at least two first reference micro-strips.

An antenna comprising at least one antenna bay comprising an input port; a feed network and a radiative component is provided. The feed network has a center node connected to the input port; a printed circuit board (PCB), comprising an active surface having at least two feed micro-strips and a reference surface having at least two first reference micro-strips, the reference surface being opposite to the active surface. The radiative component has at least two dipoles, each of the at least two dipoles being shaped as a helix and being uniformly disposed about an antenna axis, each of the at least two dipoles comprising a dipole feeded portion connected to one of the at least two feed micro-strips and a dipole reference portion connected to one of the at least two first reference micro-strips.

The invention relates to an antenna designed to emit and/or receive surface waves with a decametric, hectometric or kilometric central wavelength .sub.0, characterised in that it comprises at least one horizontal wire aerial element of between 0.5.sub.0 and .sub.0 in length, and at least three vertical wire aerial elements of the same length between 0.03.sub.0 and 0.1.sub.0, arranged in a same plane and each comprising an upper end and a lower end, said upper ends being connected to the horizontal wire aerial element, said lower ends being designed to be connected to a conducting medium having a substantially horizontal surface. The invention also relates to an antenna, an antenna array and a use of an antenna or of an antenna array.