PS810L-18G-F 18GHz Low Loss Phase Stable Coaxial Cable
18GHz Precision Phase-Stable Low-Loss Interconnect Solution
The PS810L-18G-F is a high-performance 50 Ohm low-loss phase-stable RF coaxial cable engineered for demanding microwave applications operating up to 18 GHz. Featuring an expanded LD-PTFE dielectric (83% Vp), double silver-plated copper shielding (>90 dB), and an FEP outer jacket, it combines excellent phase tracking with thermal stability across -55℃ to +165℃.
Max Frequency:DC-18GHz
Velocity of Prop.：84%
Screening Effectiveness: > 90 dB
Outer Diameter:8.10mm
Structure & Construction Characteristics
| Layer / Component | Material | Construction (mm) | Nom. O.D. (mm) |
|---|---|---|---|
| Inner Conductor | Silver Plated Copper | 1 / 2.43 | 2.43 |
| Insulation (Dielectric) | LD-PTFE (Low Density PTFE) | – | 6.60 |
| Inner Shield | Silver Plated Copper Strip | – | 6.90 |
| Outer Shield | Silver Plated Copper Wire Braid | – | 7.40 |
| Jacket | Gray FEP | – | 8.10 |
Mechanical & Environmental Parameters
| Min. Bending Radius (Static) | 40.5 mm |
| Min. Bending Radius (Dynamic) | 81.0 mm |
| Nominal Weight | 0.146 kg/m |
| Operating Temperature Range | -55 ℃ to +165 ℃ |
Electrical & Mechanical Characteristics
| Electrical Parameter | Standard Value |
|---|---|
| Impedance | 50 Ω |
| Capacitance | 80 pF/m |
| Velocity of Propagation | 83% |
| Max Operating Frequency | 18 GHz |
| Screening Effectiveness | > 90 dB |
| Dielectric Withstanding Voltage | 3000 V DC |
| Phase Stability vs. Bending | ±0.3 °/GHz |
| Phase Stability vs. Temperature (-45~+85℃) | ≤ 750 PPM |
Attenuation & Power Handling @ 25℃ & Sea Level
Insertion Loss Formula: IL = K1 * sqrt(F_MHz) + K2 * F_MHz (dB/100m)
Attenuation Constants: K1 = 0.40800, K2 = 0.00033
| Frequency (MHz) | Nom. Attenuation (dB/100m @ 25℃) | Max. Power Handling (W @ 40℃) |
|---|---|---|
| 300 | 7.17 | 3499 |
| 500 | 9.29 | 2699 |
| 1000 | 13.23 | 1895 |
| 2000 | 18.91 | 1326 |
| 3000 | 23.34 | 1074 |
| 6000 | 33.58 | 747 |
| 10000 | 44.10 | 569 |
| 12000 | 48.65 | 515 |
| 12400 | 49.52 | 506 |
| 15000 | 54.92 | 457 |
| 18000 | 60.68 | 413 |
Direct Equivalent: The PS810L-18G-F serves as a functional replacement for industry-standard 8mm microwave coaxial cables (such as CXN3508 series) requiring high velocity ratio (83% Vp), low loss, and phase stability up to 18 GHz Ku-band applications.
Frequently Asked Questions
How does the 83% velocity LD-PTFE dielectric reduce thermal phase drift in the 18 GHz Ku-band?
The expanded microporous LD-PTFE dielectric introduces uniform air pockets that mitigate the structural PTFE phase transition knee around 19℃. This maintains tight phase tracking (≤750 PPM from -45℃ to +85℃) while minimizing dielectric loss tangents across Ku-band radar and test systems.
What structural elements contribute to the >90 dB screening effectiveness at microwave frequencies?
PS810L-18G-F employs a dual-shielding mechanism: an inner helically wrapped silver-plated copper strip providing 100% optical coverage, paired with an outer high-density silver-plated copper braid. This setup minimizes transfer impedance and prevents RF leakage in dense multi-channel systems.
What are the critical mechanical bending limits for field assembly and dynamic test leads?
The static minimum bend radius is 40.5 mm, while dynamic flexing applications require a minimum radius of 81.0 mm. Maintaining these limits prevents concentricity deformation between the 2.43mm solid conductor and 6.60mm dielectric, ensuring phase stability remains within ±0.3 °/GHz.
