PS780L-18G-F High Frequency Low Loss Phase Stable Cable | 18GHz
High Frequency Low Loss Phase Stable Coaxial Cable (18GHz)
PS780L-18G-F is a premium 50 Ohm phase-stable RF coaxial cable engineered for high-frequency applications up to 18 GHz. Featuring a solid inner conductor, Low-Density PTFE dielectric, and double-layer silver-plated copper shielding, it delivers exceptional phase stability under temperature variations and flexing.
Max Frequency:DC-18GHz
Velocity of Prop.：83%
Screening Effectiveness: > 90 dB
Outer Diameter:7.8mm
Structure & Construction Characteristics
| Structure Layer | Material | Construction | Nom. O.D. (mm) |
|---|---|---|---|
| Inner Conductor | Silver Plated Copper | 1 / 2.30 mm (Solid) | 2.30 |
| Insulation | LD-PTFE (Low Density PTFE) | – | 6.30 |
| Inner Shield | Silver Plated Copper Strip | Helical Wrap | 6.60 |
| Outer Shield | Silver Plated Copper Wire | Braid | 7.15 |
| Jacket | Gray FEP | – | 7.80 |
Mechanical & Environmental Parameters
| Min. Bending Radius (Static) | 39.0 mm | Weight | 0.130 kg/m |
| Min. Bending Radius (Dynamic) | 78.0 mm | Operating Temperature | -55 to +165 ℃ |
Electrical & Mechanical Characteristics
| Impedance | 50 Ohm | Max Operating Frequency | 18 GHz |
| Velocity of Propagation | 83% | Screening Effectiveness | > 90 dB |
| Capacitance | 80 pF/m | Dielectric Withstanding Voltage | 2500 V DC |
| Phase Change vs Bending | ±0.3 °/GHz | Phase Change vs Temperature (-45~+85℃) | ≤ 750 PPM |
Attenuation & Power Handling @ 25℃ & Sea Level
Insertion Loss Calculation: IL = K1 * sqrt(F_MHz) + K2 * F_MHz (dB/100m)
Constants: K1 = 0.45630 | K2 = 0.00032
| Frequency (MHz) | Nominal Attenuation (dB/100m @ 25℃) | Max Power Handling (W @ 40℃) |
|---|---|---|
| 500 | 10.36 | 2580 |
| 1000 | 14.75 | 1813 |
| 2000 | 21.05 | 1270 |
| 3000 | 25.95 | 1030 |
| 4000 | 30.14 | 887 |
| 6000 | 37.26 | 717 |
| 8000 | 43.37 | 616 |
| 10000 | 48.83 | 548 |
| 12000 | 53.83 | 497 |
| 16000 | 62.84 | 425 |
| 18000 | 66.98 | 399 |
Cross Reference Replacement
PS780L-18G-F serves as a direct functional and form-factor equivalent for UFB311A RF coaxial cable solutions.
Frequently Asked Questions
What makes PS780L-18G-F suitable for phase-critical microwave systems?
PS780L-18G-F features high-density LD-PTFE dielectric material and solid conductor architecture, ensuring strict phase stability (±0.3°/GHz under bending) and low phase change over temperature (≤750 PPM from -45°C to +85°C).
How does the shielding structure affect performance up to 18 GHz?
The dual shielding system combines a silver-plated copper strip inner shield with a silver-plated copper braid outer shield, guaranteeing screening effectiveness exceeding 90 dB and protecting high-frequency signals against EMI.
Can PS780L-18G-F directly replace UFB311A cables in radar or test assemblies?
Yes, PS780L-18G-F is designed with identical electrical dimensions, 83% velocity of propagation, and matching attenuation specs, allowing direct drop-in replacement without re-calibrating RF systems.
