Abstract: An antenna system comprising: a ground plane; an antenna radiator separated from and overlapping the ground plane; at least one feed element configured to provide a radio-frequency feed for the antenna radiator; and at least one resonator coupled to the feed element and positioned in a space between the ground plane and the antenna radiator, wherein the antenna radiator is a broadband antenna radiator having a first operational range of frequencies and the resonator is a narrow band resonator having a second range of resonant frequencies that at least partially lie within the first operational range of frequencies.

Abstract: An antenna system including a ground plane, an antenna radiator separated from and overlapping the ground plane and at least one first conductive element extending the antenna radiator towards the ground plane. The antenna system also includes at least one feed element configured to provide a radio-frequency feed for the antenna radiator. The feed element is spatially separated from the first conductive element and the antenna radiator.

Abstract: An antenna system comprising: a ground plane; an antenna radiator separated from and overlapping the ground plane; at least one feed element configured to provide a radio-frequency feed for the antenna radiator; and at least one resonator coupled to the feed element and positioned in a space between the ground plane and the antenna radiator, wherein the antenna radiator is a broadband antenna radiator having a first operational range of frequencies and the resonator is a narrow band resonator having a second range of resonant frequencies that at least partially lie within the first operational range of frequencies.

Abstract: A resonator for radio frequency, RF, signals, said resonator comprising a cavity having a longitudinal axis, a first wall, at least one side wall, and a lid arranged opposite the first wall, wherein said resonator further comprises a guiding device which is arranged at said at least one side wall and is configured to guide an axial movement of said lid along said longitudinal axis.

Abstract: An antenna system including a ground plane, an antenna radiator separated from and overlapping the ground plane and at least one first conductive element extending the antenna radiator towards the ground plane. The antenna system also includes at least one feed element configured to provide a radio-frequency feed for the antenna radiator. The feed element is spatially separated from the first conductive element and the antenna radiator.

Abstract: A resonator for radio frequency, RF, signals, said resonator comprising a cavity having a longitudinal axis, a first wall, at least one side wall, and a lid arranged opposite the first wall, wherein said resonator further comprises a guiding device which is arranged at said at least one side wall and is configured to guide an axial movement of said lid along said longitudinal axis.

Abstract: There is provided an antenna arrangement including at least two conductive sheet arranged around at least one ground plane for transmitting radio signals from feeder cables on a transmission frequency band such that the antenna arrangement has a substantially omnidirectional radiation pattern and the antenna arrangement is configured to polarize the radio signals from a first feeder cable horizontally in a first radiation direction of the radiation pattern, polarize the radio signals from a second feeder cable vertically in a second radiation direction of the radiation pattern, polarize the radio signals from the first feeder cable and from the second feeder cable non-linearly in other radiation directions, whereby the non-linearly polarized radio signals from the first feeder cable and the second feeder cable are substantially orthogonal.

Abstract: There is provided an antenna arrangement including at least two conductive sheet arranged around at least one ground plane for transmitting radio signals from feeder cables on a transmission frequency band such that the antenna arrangement has a substantially omnidirectional radiation pattern and the antenna arrangement is configured to polarize the radio signals from a first feeder cable horizontally in a first radiation direction of the radiation pattern, polarize the radio signals from a second feeder cable vertically in a second radiation direction of the radiation pattern, polarize the radio signals from the first feeder cable and from the second feeder cable non-linearly in other radiation directions, whereby the non-linearly polarized radio signals from the first feeder cable and the second feeder cable are substantially orthogonal.

Abstract: An antenna arrangement is provided, which includes first and second antenna elements. A feeder line connects the first and second antenna elements for feeding a signal to and from the first and second antenna elements and the signal is inductively coupled between the feeder line and a calibration line so it can be fed to measurement equipment.

Abstract: A dielectric body is provided with at least two coupling structures for coupling in and coupling out electronic signals, and one or more conductors on surface portions of the body. An outer surface of the body includes one or more indentations. The coupling structure includes a coupling conductor for signal input and/or output, and in relation to an end portion of the conductor a coupling hole extending from the first surface and/or from a second surface opposite the first surface into the body.

Abstract: A method for calibrating an antenna uses a first and a second antenna element arranged in an array, and a calibration probe that is fixedly located substantially at a phase center of the first and second antenna elements. Phase and amplitude of a signal at each of the first and second antenna elements is measured at the calibration probe. A phase error is determined from a difference between the measured phases, and an amplitude error is determined from a difference between the measured amplitudes. For reception, the phase and amplitude error is applied to align the phases and amplitudes of the signals received at the first and second antenna elements. For transmission, the phase and amplitude error is applied to one signal prior to transmitting parallel signals from both antenna elements. Details are shown for finding the phase center as well as applying the phase and amplitude differences.