Abstract: An N-element rotational-symmetric array antenna can generate N fixed pencil-beams simultaneously with an omnidirectional beam. An N×N Butler matrix can be used to feed the array antenna, using fewer than N input ports of the Butler matrix to produce the pencil-beams. One or more of the modes generated by the Butler matrix can be individually accessed to produce one or more corresponding omnidirectional beams. The N×N Butler matrix can be driven by a feed network that provides both power dividing and beam-steering, which permits simultaneous generation of the N pencil-beams.

Abstract: The present invention is directed to cellular systems and methods for providing a multi-beam antenna configuration within a base station without utilizing duplex filters. The multi-beam antenna configuration of the present invention produces overlaid beams in both the uplink and downlink to cover the same area. Each beam has orthogonally oriented polarization directions (e.g., linear polarized slanted ±45°) for the uplink and downlink. Adjacent uplink beams shall also have shifted polarization directions in order to attain polarization diversity between different beams. In order to implement this polarization configuration, for each beam, there is a selective filter in front of the low noise amplifier for the uplink, and no duplex filter in front of the amplifier in the downlink direction.

Abstract: The present invention relates to an omnidirectional base station antenna arrangement with a number of antenna elements and a number of transceiver means for transmitting and receiving signals to/from a number of user stations. A feeding network is provided which comprises a number of phase ports, a number of which form first phase ports connected to a number of transceiver means for downlink communication and a number of which form second phase ports connected to a number of transceiver means for uplink communication. The feeding network comprises a number of antenna ports connected to antenna elements and the feeding network generates substantially independent, orthogonal signals to provide for phase diversity and the antenna elements are arranged to form at least one cylindrical array antenna.

Abstract: A telecommunications system and method is disclosed for allowing a base station to simultaneously transmit signals in several beams of a multi-beam antenna configuration. Antenna pattern control is maintained by employing orthogonal polarization orientation for every other beam. For example, the two orthogonal polarization directions can be approximately linear polarization slanted ±45°. To be able to transmit simultaneously in an arbitrary combination of more than one beam, the BS antenna array includes a separate feeder cable for each combination of beams corresponding to a particular polarization, from one feeder per beam to one feeder with all beams of that polarization.

Abstract: A dual-polarized antenna (10) with good isolation between feed ports (13a, 13b) and high similarity with respect to the radiation patterns is provided. An antenna (10) includes a patch (11), four symmetrically arranged feed structures (12a-12d, 15), two feed ports (13, 13b) and a feed network (14). Radiation pattern similarity is obtained by the pair-wise symmetrical, orthogonal layout of the feed structures (12a-12d, 15). Good isolation between feed ports (13a, 13b) is achieved through a feed network (14) divided into two network parts (14a, 14b) where each network part (14a, 14b) is designed so that each coupling between a network part (14a, 14b) and a feed structure (12a12d, 15) belonging to the other polarization is cancelled by a mirrored coupling with the other feed structure (12a-12d, 15) belonging to the polarization. In addition, a network part (14a, 14b) is laid out so that its corresponding feed structures (12a-12d, 15) are fed with supporting signals of equal magnitude.

Abstract: A multi-carrier power amplifying arrangement has a number of amplifying devices, each of which includes a main amplifier and a linearizing device. Furthermore it includes a device signal for adding the adding output signals from the amplifying devices in phase, a device for detecting the average phase error of the amplified signals and for providing a compensating control signal. The compensating control signal is provided to each amplifying device at least to compensate for the average phase error.

Abstract: An electronics unit for wireless transfer of signals, includes an antenna part, an electronics part, and a transmission circuit part. The electronics part is placed on a laminate with at least one substrate layer of a dielectric material. The substrate layer is made of a flexible material and forms a continuous unit, including a first part which supports the electronics part, a second part which supports the antenna part, and a third part which supports the transmission circuit part. The second part of the substrate is formed to shape a convex surface, which supports groups of at least one antenna element. Since the surface is curved, the groups cover different directions.

Abstract: In a cellular telecommunications network, a method and apparatus is disclosed for providing a substantial gain in downlink C/I by means of antenna pattern downtilt while still maintaining the coverage limiting signal strength in the uplink by the use of different antenna pattern downtilt for the transmit and receive antenna patterns.

Abstract: To improve null depths in an antenna pattern of a first polarization, formed with nulls in at least one angular region, a further antenna pattern of a second polarization, substantially orthogonal to the first polarization, is concurrently formed. In the angular region, the amplitudes of the copolar components of the further antenna pattern are substantially equal to the amplitudes of the crosspolar components of the antenna pattern of the first polarization, and the phases of the copolar components of the further antenna pattern of the second polarization are substantially opposite to the phases of the crosspolar component of the first polarization.

Abstract: An antenna arrangement and a method for obtaining such an antenna arrangement are disclosed. The antenna arrangement utilizes the beam ports of a beam forming network, e.g. a Butler matrix, in connection with a multi-element radiator antenna for obtaining receive/transmit channels having more antenna beams within a desired coverage. At least one extra signal combiner is utilized for combining at least one beam port of a number of ordinary beam ports with a nonadjacent beam port to form one receive/transmit channel in a number of desired receive/transmit channels. The particular receive/transmit channel uses the at least one extra signal combiner for combining at least one of a number of ordinary beam ports with a nonadjacent beam port normally being terminated, for adapting power and sensitivity distributions for a desired cell coverage or for desired coverage of overlapping cells.

Abstract: A device for microstrip distribution networks and for group antennas for the suppression of unwanted modes on the distribution network side of a microstrip distribution network. This thereby avoids, among other things, unwanted coupling between antenna elements connected to the microstrip distribution network. A waveguide substructure in principle designed as a U of extruded aluminium, is connected to the microstrip distribution network along two connection lines with at least two electrically-conductive connections to the ground plane of the microstrip distribution network along each connection line. Together with at least part of the ground plane, the waveguide substructure forms a waveguide structure. The waveguide structure is dimensioned so that it has a cut-off frequency that is higher than the highest frequency that is used in the microstrip distribution network.

Abstract: An antenna arrangement and a method for obtaining such an antenna arrangement are disclosed. The antenna arrangement utilizes the beam ports of a beam forming network, e.g. a Butler matrix, in connection with a multi-element radiator antenna for obtaining receive/transmit channels having more antenna beams within a desired coverage. At least one extra signal combiner is utilized for combining at least one beam port of a number of ordinary beam ports with a nonadjacent beam port to form one receive/transmit channel in a number of desired receive/transmit channels. The particular receive/transmit channel uses the at least one extra signal combiner for combining at least one of a number of ordinary beam ports with a nonadjacent beam port normally being terminated, for adapting power and sensitivity distributions for a desired cell coverage or for desired coverage of overlapping cells.

Abstract: A method and arrangement improve antenna performance parameters. The antenna includes a radiating device for radiating a beam in a substantially predefined direction. The radiating device is provided on a supporting structure. The arrangement includes at least one device to mechanically tilt the radiating device in a first direction substantially diverging from the predefined direction, and a device to tilt the beam in a second substantially opposite direction electrically.

Abstract: Dual polarized antenna device for wireless transmission of information using electromagnetic signals with polarizations orthogonal to each other, with at least one antenna element and at least one ground plane made from a first electrically conducting layer, at least one feeder network made from a second electrically conducting layer and a plurality of apertures in said ground plane, which apertures each consist of one or several aperture sections, and which extend between two end points, which apertures are arranged in at least one aperture group, with each aperture group being symmetrical relative to the planes which are defined by the two polarizations, and with each aperture group consisting of at least one first aperture, which aperture is centrally positioned in the group and is intended for the first polarization, and at least two outer apertures intended for the second polarization, symmetrically positioned on each side of the central aperture with the distance along a straight line between the end po

Abstract: A dual polarized antenna comprises at least one radiating element and a ground plane. The ground plane is, at least partly, provided with a side wall. At least one polarization selective element is provided between the radiating element and the side wall to transmit one of the polarizations and to determine the radiation pattern of the other polarization.

Abstract: An antenna assembly, and an associated method, which exhibits a selected the antenna beam configuration. The direction of a primary lobe and of a null is selected to improve the signal-to-noise and signal-to-interference ratios of communication signals transmitted between two communication stations. When implemented to form a portion of a base station of a cellular communication system, the traffic capacity of the communication system can be increased and the infrastructure costs of the system can be reduced.