PS420LS-31G-F Low Loss Flexible Phase Stable Cable | Up to 31GHz
Flexible Low Loss Phase Stable RF Coaxial Cable (Up to 31 GHz)
Engineered with a 19-strand silver-plated copper inner conductor for superior flexural endurance, combined with LD-PTFE insulation and high-temperature FEP jacketing. Ideal for dynamic high-frequency testing, military avionics, and radar interconnects operating up to 31 GHz.
Max Frequency:DC-31GHz
Velocity of Prop.：77%
Phase Stability ：±0.3 °/GHz
Outer Diameter:4.2mm
Structure & Construction Characteristics
| Structure Layer | Item | Material | Construction / Dimension |
|---|---|---|---|
| Inner Conductor | Material & Stranding | Silver Plated Copper | 19 / 0.204 mm (Stranded, Nom. O.D. 1.02 mm) |
| Insulation | Dielectric Material | LD-PTFE (Low Density PTFE) | Nom. O.D. 3.00 mm |
| Inner Shield | Wrapping Layer | Flat Silver Plated Copper Wrapped Strip | Nom. O.D. 3.20 mm |
| Outer Shield | Braid Layer | Round Silver Plated Copper Braided Wire | Nom. O.D. 3.65 mm |
| Jacket | Outer Protective Layer | Aqua FEP | Nom. O.D. 4.20 mm |
Mechanical & Environmental Parameters
| Min. Bending Radius (Static) | 15.00 mm | Weight | 0.048 kg/m |
| Min. Bending Radius (Dynamic) | 42.00 mm | Operating Temperature | -55 to +165 ℃ |
Electrical & Mechanical Characteristics
| Impedance | 50 Ohm | Max Operating Frequency | 31 GHz |
| Capacitance | 88 pF/m | Screening Effectiveness | > 90 dB |
| Velocity of Propagation | 77% | Dielectric Withstanding Voltage | 1500 V @ DC |
| Phase Change vs. Bending | ±0.3 °/GHz | Phase Change vs. Temp (-45~+85℃) | ≤ 1500 PPM |
Attenuation & Power Handling @ 25℃ & Sea Level
Attenuation Formula: IL = K1 * sqrt(F_MHz) + K2 * F_MHz
Constants: K1 = 0.941656209 | K2 = 0.001712613
| Frequency (MHz) | Nominal Attenuation (dB/100m) | Max Power Handling (W) |
|---|---|---|
| 500 | 21.91 | 860 |
| 1000 | 31.48 | 598 |
| 2400 | 50.21 | 375 |
| 3000 | 56.70 | 332 |
| 6000 | 83.27 | 226 |
| 8000 | 97.89 | 192 |
| 10000 | 111.29 | 169 |
| 12400 | 126.15 | 149 |
| 18000 | 157.19 | 120 |
| 20000 | 167.38 | 112 |
| 26500 | 198.88 | 98 |
Replaceable / Cross Reference Equivalents
The PS420LS-31G-F is engineered as a direct equivalent for high-frequency low-loss flexible phase-stable coaxial cables. Featuring a 19-strand inner conductor and LD-PTFE dielectric, it serves as an ideal drop-in replacement for industry-standard flexible millimeter-wave assemblies operating up to 31 GHz, delivering superior flex life and outstanding mechanical phase stability for dynamic test setups and military interconnects.
Frequently Asked Questions
How does the 19-strand inner conductor enhance the flexural life of PS420LS-31G-F compared to solid-center cables?
The 19/0.204 mm stranded silver-plated copper center conductor significantly increases fatigue resistance under repeated flexing. It minimizes work-hardening and micro-fracturing of the center core, maintaining reliable phase stability and insertion loss in dynamic test setups and gimbal-mounted antenna assemblies up to 31 GHz.
What shielding performance is achieved by combining flat copper tape and round wire braid?
The composite double-shield design—featuring a 100% overlap flat silver-plated copper tape inner layer and a silver-plated copper wire outer braid—delivers RF shielding effectiveness greater than 90 dB. This structure minimizes high-frequency radiation loss and prevents external electromagnetic interference in congested RF system environments.
How does the LD-PTFE dielectric combined with FEP jacket perform in wide temperature ranges?
The low-density PTFE (LD-PTFE) dielectric provides a 77% velocity of propagation and low dielectric loss, while the high-temperature Fluorinated Ethylene Propylene (FEP) jacket protects against chemical exposure and environmental stress. The combination ensures a low phase temperature coefficient (≤ 1500 PPM) across an operational window of -55°C to +165°C.
