摘要:
A Radio-Frequency (RF) waveguide comprising at least a folded sheet (3) is described, wherein the sheet comprises a first layer made of a plastic, and at least a second layer made of a electric conductive material. Furthermore a method for manufacturing such a RF waveguide plus a device to perform said method is described.
摘要:
There is provided a device for electrically conductive contacting of a pipe having a band shaped metallic clamp (2) with two end parts (6, 7), wherein the clamp is equipped with parts of a closing device (11, 13, 14) at both end parts. The device has a separator (4) made from electrically conductive material, wherein the separator is deformable under pressure and wherein the separator is attached to the inner surface of the clamp. The device further comprises insulating material (3), wherein the clamp is embedded in the insulating material leaving free the inner surface required for making contact with the pipe. Furthermore, the embedded material leaves free both end parts of the clamp enabling a direct contact between both end parts in an assembly position of the device around the pipe.
摘要:
There is provided a device for electrically conductive contacting of a pipe having a band shaped metallic clamp (2) with two end parts (6, 7), wherein the clamp is equipped with parts of a closing device (11, 13, 14) at both end parts. The device has a separator (4) made from electrically conductive material, wherein the separator is deformable under pressure and wherein the separator is attached to the inner surface of the clamp. The device further comprises insulating material (3), wherein the clamp is embedded in the insulating material leaving free the inner surface required for making contact with the pipe. Furthermore, the embedded material leaves free both end parts of the clamp enabling a direct contact between both end parts in an assembly position of the device around the pipe.
摘要:
A geometrically-structured coaxial cable may prevent infiltration of water vapor and other contaminants by using a closed cell structure. The cable may be fabricated by wrapping bubble tape around its central conductor. Alternatively, plastic may be extruded through channels to create a plurality of layers. In either case, these layers are staggered in a zig-zag pattern to ensure that no radial spokes connect the inner and outer conductors of the coaxial cable without passing through a plurality of dielectric layers.
摘要:
A radiating coaxial radio-frequency cable is specified, that comprises an inner conductor, a dielectric surrounding the latter and a tubular outer conductor disposed above the latter and concentric with the inner conductor. In the outer conductor, mutually separated openings (5) are provided that are disposed in a mutually offset manner in the circumferential direction of the cable and, in the longitudinal direction of the latter, are disposed along surface lines extending mutually in parallel in rows (R1, R2, R3) extending over the entire length of the cable. All the openings (5) extend essentially in the circumferential direction of the cable. For as broadband an operation of the cable as possible, in a first row (R1 ) for operating a frequency range used in mobile radio, openings (5) are disposed in groups (G) in a constantly repeating pattern whose first openings (5), viewed in each case in the axial direction of the cable, are at a mutual spacing (A1) corresponding to half the wavelength of the lowest frequency to be transmitted in the frequency range. In addition, in each group (G), further openings (5) are provided to take account of integral multiples of the lowest frequency to be transmitted in the frequency range. Further openings (5) are situated in at least one second row (R2 ) on a surface line other than that of the openings (5) of the first row (R1) and are disposed over the entire length of the cable at mutual constant spacing that is less than half the wavelength of the highest frequency to be transmitted over the cable.