Feature Interconnection
speciality insulated wire and cable for harsh environments.
Designing for application needs Coatings include high performance flu- oropolymer coatings and biomedical materials with standard wire sizes from 50 to 26AWG, with constructions designed to meet demanding customer specifications. For example, some of these products include a 0.0005” pin- hole free extruded wall of insulation over wires finer than a human hair. Achieving these demanding cus- tomer specifications place an emphasis on how the cable is manufactured. For example, is the diameter of the cable at the start of the reel the same as in the middle and at the end? The mechanical consistency of these cables is tested along the whole length with documen- tation available to validate electrical performance.
Consistently monitored coaxial cable manufacturing processes are used to maintain tight mechanical tolerances, yielding high electrical performance of the company’s flexible RF cable, flexi- ble microwave cable, low inductance cable and coaxial ribbon cable. Low loss, flexible microwave cable uses monofilament technology to enhance performance at high frequencies. The FEP flat ribbon high tempera- ture, high flex, abrasion resistant cables
5123
typically has a lower VoP (such as 0.65) due to its insulation material choice, can transmit a signal at 65 percent of the speed of light.
use a chemically-inert insulation mate- rial. This low dielectric FEP material is extruded, creating electrical and mechanical performance advantages. The Velocity of Propagation (VoP) of an electrical or electromagnetic signal is the speed of transmission through a physical medium such as a coaxial cable or optical fibre; there is a direct relation between VoP and wavelength of the signal, and the VoP of a cable can change with temperature and age. Often stated as a percentage of the speed of light, VoP can also be stated as time-to distance. To explain, a cable with a VoP of 0.85 would transmit a signal at 85 percent of the speed of light. The VoP is a direct function of the dielectric constant of the insulation material. A twisted pair cable, which
Premium compact appliance filter
Figure1:
TF microwave solid core cable
In certain applications speed is of the essence, which is why the VoP is pre-defined and normally specified. In satellite applications, for example, engineers will tend to specify low loss RF signalling cabling with high radia- tion resistance. These coaxial cable solutions are insulated with a fluo- ropolymer dielectric, with a helically- wrapped silver-plated copper flat wire shield and braid sizes to achieve their shielding effectiveness.
The standard solid core (low loss) con- struction coaxial cable delivers 70 percent VoP; well-suited for satellite applications. The air enhanced dual monofilament design (ultra-low loss) achieves 85 to 88 percent VoP and improved insertion loss at high frequencies.
Molex
www.molex.com Enter 207
For ground-based radar applica- tions, on the other hand, the system designer requires tightly controlled differential signalling to minimise skew; here, tightly controlled twisted pairs are used. In digital soldier appli- cations, where high speed quadrax and twisted pair data lines and power in a round and robust cable are required, cabled primaries with custom fillers and shield offer a flexible robust solution.
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