Abstract: The present invention relates to a reflector 20; 30; 40 for use in an antenna 10; 50. The reflector 20; 30; 40 is arranged to be used as an earth plane of the antenna 10 and the reflector is corrugated to form current pockets. The reflector 20; 30; 40 comprises at least two separate parts 21, 22; 21, 22, 31, 32; 41, 42, and the parts are electrically coupled to each other to commonly form the earth plane of the antenna 10; 50. The invention also relates to an antenna including a reflector, and to a method for manufacturing a reflector.

Abstract: An antenna assembly and a method of mounting such an assembly are disclosed. A first and a second assembly portion are joined together, wherein the assembly portions each comprise a elongated reflector body serving as a reflector for electromagnetic power radiated by the antenna assembly portion, and a set of antenna element receiving means located in a linear row along a longitudinal direction of the reflector body for respectively receiving an antenna element, and side portions along the long sides of the said reflector body. The assembly method comprises the step of fastening the first and second assembly portions to each other along a respective side portion of the said assembly portions so as to form a dual array antenna assembly.

Abstract: An improved control system for controlling the electrical tilt, i.e. the electrically controlled inclination of a radiated beam, of a base station antenna (70) with a vertical row of antenna elements is disclosed. The antenna includes a phase shifting device (73) including a tilt adjusting mechanism with a displaceable mechanical element for adjusting an electrical tilt setting of the antenna lobe being radiated from the antenna. The control system is divided into two parts, namely a first part, including the entire tilt adjusting mechanism (73), an electrical motor (75) and a position sensor (74), these elements constituting internal components being arranged inside the antenna casing (70), and a second part, including the remaining components of the control system, including an electrical motor control circuit (51; 61), and a logic circuit (56; 66) determining the electrical tilt setting.

Abstract: An improved control system for controlling radiation direction of an antenna beam of an antenna is disclosed. The radiation direction is adjustable by an actuating device influencing phase shifting means based on an actuating signal. The system includes filtering means, arranged for filtering out a control signal and being connected, in use, to a feeder cable arranged for carrying RF signals and control signals. The system further includes an external control unit including detecting means, arranged for detecting the filtered out control signal, and control means, arranged for producing the actuating signal based on the detected control signal. The filtering means is directly connected to the external control unit so as to provide the filtered out control signal directly to the external control unit.

Abstract: The present invention relates to an antenna arrangement comprising a first and third set of antenna elements, being arranged as a first and third column and aligned along a first and third symmetry axis, respectively, each column comprising elements being operative in a first frequency band (f1) and elements being operative in a second frequency band (f2). The antenna arrangement further comprises a second set of antenna elements, being arranged as a second intermediate column along a second symmetry axis, said second symmetry axis being parallel to said first and third symmetry axes, and being operative in said second frequency band (f2), wherein the ratio of said second center frequency (f2) to said first center frequency (f1) is in the range 1.5 to 3. The distance between said first and third symmetry axes is less than or equal to 0.

Abstract: The present invention relates to an antenna-filter module for transferring radio frequency electromagnetic signals between the ambient air and an electronic circuit. The module includes an antenna element and at least two integrated band pass filter disposed adjacent to said antenna element. The antenna element is arranged as a joint antenna element, having a substantially greater bandwidth than each filter and providing a number of antenna-filter combinations within the module. The joint antenna element is arranged in close proximity to a first resonator of each filter in the module so as to provide an electromagnetic coupling to the resonators of each filter and a differentiated, specific pass band for the respective antenna-filter combination. Each filter is provided with a coupling member for coupling to an electronic circuit, such as an amplifier.

Abstract: The invention relates to a transmission line (1) comprising: a groove (2) defined by two parallel conducting walls (3) and a conducting floor (4) all electrically connected to each other, together forming a peripheral conductor of the transmission line, and a center conductor (5), at least partly submersed in the groove (2), the center conductor (5) being isolated from the conducting walls (3) and the conducting floor (4) of the groove (2). The transmission line is distinguished in that the center conductor (5) comprises at least one conductor formed on a side of a printed circuit board (6). The invention also relates to a method for the production of a transmission line.

Abstract: There is disclosed an electromagnetic transmission line arrangement with a phase shifter, comprising at least one conductive branch line (51a,51b) extending from a junction point (51c) to an associated output port, for the propagation of electromagnetic signals in a frequency band along said branch line. The phase shifter includes at least one dielectric body (52,53,54) which is mounted so as to be movable sideways in a transverse direction into a delaying position at least partly covering said branch line (51a,51b). The longitudinal distribution of its dielectric material (?) is adapted to cause, when being moved transversally into said delay position, a controlled phase shift but also to secure, by way of said selected longitudinal distribution of its dielectric material in conjunction with said at least one branch line, an input impedance matching of said transmission line arrangement. The transmission line arrangement can be used in the feeding network to a microwave antenna.

Abstract: An antenna control system in which various antenna elements in a vertical row are coupled by fixed transmission lines to a central feeding point for a common signal. Adjustment of the phase of the common signal is achieved by means of a linearly movable slide having dielectric body portions influencing the signal velocity along said fixed transmission lines. Further, an electrical motor is used for linearly displacing said movable slide with said dielectric body portions.

Abstract: A dual polarized antenna element having improved antenna isolation is disclosed by the present invention. The antenna element includes a first feeder for feeding the antenna element in a first polarization direction, and a second feeder for feeding the antenna element in a second polarization direction. According to the present invention, a compensation line is arranged between the first and the second feeders for compensating for an imbalance caused by an essentially capacitive coupling between the first and second feeders. The compensation line is connected to the first and second feeders in close proximity to a radiating part of said antenna element, and has a short electrical length ? and a high impedance relative to an impedance of the first and second feeders, respectively, thereby giving the compensation line an essentially inductive character.

Abstract: The present invention relates to a device for adjusting the beam direction of a beam radiated from a stationary array of antenna elements. Antenna element feed points are coupled to a common source via a feed line structure having a source connection and feed connection terminals to be connected to the antenna element feed points, the feed line structure being at a distance from and in parallel to a fixed ground plane. A movable element is located adjacent to the feed line structure to change the signal phase of signal components being transferred between the source connection and the respective feed connection terminals. The movable element is movable for effecting a phase shift of the signal components to adjust the beam direction. The device is provided with a detection arrangement for detecting the absolute position of the movable element.

Abstract: An improved control system for controlling the electrical tilt, i.e. the electrically controlled inclination of a radiated beam, of a base station antenna (70) with a vertical row of antenna elements is disclosed. The antenna includes a phase shifting device (73) including a tilt adjusting mechanism with a displaceable mechanical element for adjusting an electrical tilt setting of the antenna lobe being radiated from the antenna. The control system is divided into two parts, namely a first part, including the entire tilt adjusting mechanism (73), an electrical motor (75) and a position sensor (74), these elements constituting internal components being arranged inside the antenna casing (70), and a second part, including the remaining components of the control system, including an electrical motor control circuit (51; 61), and a logic circuit (56; 66) determining the electrical tilt setting.

Abstract: The present invention relates to an antenna arrangement comprising a first and third set of antenna elements, being arranged as a first and third column and aligned along a first and third symmetry axis, respectively, each column comprising elements being operative in a first frequency band (f1) and elements being operative in a second frequency band (f2). The antenna arrangement further comprises a second set of antenna elements, being arranged as a second intermediate column along a second symmetry axis, said second symmetry axis being parallel to said first and third symmetry axes, and being operative in said second frequency band (f2), wherein the ratio of said second centre frequency (f2) to said first centre frequency (f1) is in the range 1.5 to 3. The distance between said first and third symmetry axes is less than or equal to 0.

Abstract: The present invention relates to an antenna arrangement connectable to a transceiver for transmitting and receiving RF signals in at least two separate frequency bands. The antenna arrangement has at least two sets of antenna elements arranged on a reflector, and the antenna elements are arranged in an interleaved configuration along a single column. The two separate frequency bands are substantially non-overlapping but relatively close to each other, and the distance between adjacent antenna elements in said column is substantially the same along the column.

Abstract: An antenna control system for setting the tilt angle of a main lobe of an antenna, in particular of an antenna constituting part of a base station in a mobile cellular communication system, said antenna comprising a plurality of antenna elements and phase shifting means for varying the phase of at least one signal being fed to said antenna elements, wherein adjustment of said phase of said signal is achieved by actuating an operating element, and wherein actuation of said operating element is achieved by operating an operating element actuator. The operating element actuator is coupled to the operating element of the phase shifting means by means of a force field coupling.

Abstract: The present invention relates to a DC extracting arrangement in a RF filter used for extracting a DC voltage and/or a low frequency signal (DC/Com. signal) superimposed on a RF signal. The DC/Com. signal is extracted using a low pass filter which is arranged inside the first resonator inside the filter. Preferably, the low pass filter is a tubular filter. The invention also relates to a filter housing made from Zinc or Zinc alloy.