PTFE is known to be the best dielectric for RF (Radio frequency) coaxial cables. The essential function of coaxial cables is to transmit high frequency energy and signals with low loss, with reflection less matching and without Phase and Amplitude distortion.
The problem in high-energy transmission is the losses because of i) cable dielectric, ii) cable construction, iii) radiation, and iv) interference with adjoining circuits. The coaxial cable construction has been invented to overcome these problems, in which signals and energy are contained within an enclosed space. It consists of a core conductor, surrounded by pure PTFE dielectric covered with a metal shield, and finally encased in an overall jacket. The shield provides the return path as well as the confinement for RF energy, and is generally grounded.
|Core Conductor (mm)||Core Dia (mm)||Shield||Outer Dia (mm)||Continuous Working Voltage||Max Operating Frequency||Operating Temperature||Nominal Capacitance (pf/mtr)||Attenuation at 400 MHz DB/ 100m (Max)|
|196 A/U||50 Ohm||7 / 0.10 SPCW||0.863 PTFE||1SPC Braid||1.800 PTFE||750 VRMS||3 GHz||Cryogenic to 200°C||95.0||103.00|
|188 A/U||50 Ohm||7 / 0.17 SPCW||1.524 PTFE||1SPC Braid||2.490 PTFE||900 VRMS||3 GHz||Cryogenic to 200°C||95.0||65.60|
|187 A/U||75 Ohm||7 / 0.10 SPCW||1.600 PTFE||1SPC Braid||2.540 PTFE||900 VRMS||3 GHz||Cryogenic to 200°C||65.6||68.90|
|195 A/U||95 Ohm||7 / 0.10 SPCW||2.591 PTFE||1SPC Braid||3.580 PTFE||1100 VRMS||3 GHz||Cryogenic to 200°C||52.5||55.80|
|142 B/U||50 Ohm||1 / 1.00 SPCW||2.946 PTFE||2 SPC Braid||4.950 PTFE||1400 VRMS||12 GHz||Cryogenic to 200°C||93.5||29.50|
|141 A/U||50 Ohm||1 / 1.00 SPCW||2.946 PTFE||1SPC Braid||4.830 VFG-1||1400 VRMS||3 GHz||Cryogenic to 200°C||93.5||29.50|
|115 A/U||50 Ohm||7 / 0.71 SPC||6.350 PTFE||2SPC Braid||9.530 VFG-3||3700 VRMS||12 GHz||Cryogenic to 200°C||93.5||17.10|