Abstract: This invention relates to a phase shifting device, which generally comprises of rigid chassis, in the form of an aluminum plate, which can form a ground plane for feed lines (12) printed on a printed circuit board (16), which is mounted on the chassis, a rigid RF transparent block, which is fixed to an actuator arm and mounting bolts for slidably mounting block and actuator on the chassis. A flexi circuit, or the equivalent, (18) is attached to the block and is printed with generally c-shaped conductive strips (23), which form connections at open parts of the feed lines, in such a manner that movement of the block will cause changes in the effective lengths of the feed lines (12) and hence the relative phases of antennas fed by those feed lines.

Abstract: A cable clamp includes at least two elements which, preferably are interference-fittable together by way of male and female members. The cable clamp may also have on one or more of the elements, a ratchet mechanism on a surface which abuts against the face of a second cable clamp positioned against the first cable clamp. The ratchet mechanism allows the first and second cable clamps to be positioned relative to one another in a controlled manner.

Abstract: A cable clamp comprising at least two elements which, preferably are interference-fittable together by way of male and female members. The cable clamp may also have on one or more of the elements, a ratchet mechanism on a surface which abuts against a face of a second cable clamp positioned against the first cable clamp. The ratchet mechanism allows the first and second cable clamps to be positioned relative to one another in a controlled manner.

Abstract: A dual polarization antenna includes a non-conducting space surrounded by a ground plane. Two angularly offset sets of dipole structures penetrate into the space. Each set of dipole structures comprises a pair of aligned short circuit elongate dipoles extending from the ground plane into the space from diametrically opposed directions and terminating in respective free ends. The free ends are adjacent, but spaced from each other, to define a gap between them. At least one separate device is provided for exciting each set of dipole structures or each dipole structure within a set individually. A radiating element is provided overlying the dipole structures such that the dipole structures couple, in use, with the radiating element, causing the radiating element to radiate polarizations determined by the orientation of each of the sets of dipole structures.