Abstract: A shielded housing of electrically conducting material for use in various electromagnetic applications. The housing comprises an upper part (10) and a lower part (20), each part having two side flanges (12, 13, 22, 23). When the housing is assembled, one of the pairs of side flanges fits resiliently inside the other pair, and the mutually contacting side flanges exert a surface contact pressure against each other, so as to jointly form sidewalls of the housing.

Abstract: The invention generally relates to a connector (1) for receiving a cable end (12), arranged for being attached to a circuit board. The connector is provided with a through hole (10) for receiving the cable end, at least one upper lip (5) and at least one lower lip (3) with a connector recess (11, 13) therebetween for fitting onto an edge of a slit (6) in the circuit board. The connector is further provided with at least one snap holding element (4), disposed adjacent to said connector recess (11, 13), so as to engage with a portion (7) of the circuit board, adja-cent to the edge of the slit 6 in the circuit board.

Abstract: A device for adjusting the beam direction of a beam radiated from a stationary array of antenna elements. The device comprises a feed line structure configured as a star with at least four line segments extending from a central source connection terminal at the centre of the star, to the respective feed connection terminals (100). The dielectric body with two different body portions, having different effective dielectric values, is displaceable between two end positions in a central, region of the device.

Abstract: A shielded housing of electrically conducting material for use in various electromagnetic applications. The housing comprises an upper part (10) and a lower part (20), each part having two side flanges (12, 13, 22, 23). When the housing is assembled, one of the pairs of side flanges fits resiliently inside the other pair, and the mutually contacting side flanges exert a surface contact pressure against each other, so as to jointly form sidewalls of the housing.

Abstract: A dual band antenna with dual antenna elements, each including a first and a second antenna element (5b, 6b), for transmitting and/or receiving radio frequency radiation in a first, relatively low frequency band and a second, relatively high frequency band, respectively, and an electrically conductive, substantially planar reflector device (1). Each first antenna element (5b) is located close to an associated one (6b) of the second antenna elements on a front side of the reflector device so as to define first and second radiation beams. The reflector device, on each lateral side thereof, is provided with an edge portion formed as a groove (11, 12), which is open towards the front side of the reflector device and which is dimensioned so as to widen the azimuth beam width of the second beam to an angular value being close to that of the first beam, whereby both beams will have substantially the same azimuth width.

Abstract: An antenna arrangement for receiving and/or transmitting electromagnetic signals in two spaced-apart frequency bands including a first frequency band having a first center frequency (f1) and a second frequency band having a second center frequency (f2). A first set of antenna elements (A1) are operative in the first frequency band (f1), and a second set of antenna elements (A2) are operative in the second frequency band (f2). A feeding network (C, 10, C1, C2) is arranged for feeding signals to the respective sets of antenna elements. The first set of antenna elements (A1) are arranged geometrically so that the first set has a first length (D1) in a first direction. The second set of antenna elements (A2) are arranged geometrically so that the second set has a second length (D2) in said first direction. In order to obtain lobes with the same beam width, said first and second lengths (D1, D2) are substantially inversely proportional to the first and second center frequencies (f1, f2).

Abstract: An antenna for receiving and/or transmitting electromagnetic waves, comprising an array of antenna elements including at least one longitudinal row of antenna elements (7) located at a distance (d) from each other, each such row of antenna elements being adapted to receive and/or transmit a dual polarized beam including two separate, mutually isolated channels. Along each longitudinal row of antenna elements, in the vicinity of the gap between a respective pair of adjacent antenna elements, preferably at the side of the centre line (C) of the row, there are disposed parasitic elements (8a, 8b) serving to influence the mutual coupling between said adjacent antenna elements in such a way as to improve the isolation between the separate channels.

Abstract: A flat aperture-coupled antenna with a multilayer structure is disclosed. A rear side of the antenna comprises a metal reflector device including a hollow structure (3, 5) with separate box-like compartments, located in registry with radiating patches, corresponding pairs of orthogonal slots and feed elements, whereby microwave propagation within the hollow metal structure is substantially interrupted and any mutual coupling between the orthogonal slots is avoided.

Abstract: In a metallic pipeline (1) disposed in the ground, alternating voltages may be induced from adjacent transmission lines and cause corrosion. To reduce the risk of corrosion, an alternating current (i.sub.1) is caused by means of a compensating device (PD) to flow through the line and to cause a voltage drop which counteracts the induced voltages. A measuring conductor (2) provides a signal (u.sub.s) which is a measure of the induced voltage. This signal controls the amplitude and phase position of an alternating voltage (u.sub.1) which is generated by an a.c. source which is connected to feed points (A, B) on the line and which causes an alternating current (i.sub.1)) to flow through the line. (FIG.

Abstract: In a metallic pipeline (1) disposed in the ground, voltages may be induced from adjacent transmission lines and cause corrosion. To reduce the risk of corrosion, voltages are induced in the pipeline with the aid of a transformer (8), which voltages counteract the induced voltages. A measuring conductor (2) provides a signal which is a measure of the induced voltage. In a suitable way, this signal controls the amplitude and phase position of a voltage (U.sub.1) which is generated by a converter coupling (7) and is applied to the primary winding of the transformer (8). (FIG.