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RF feeder, also known as RF coaxial cable, serves as a crucial bridge connecting antennas to transmitting or receiving equipment. It is responsible for stably transmitting high-frequency signals from the equipment end to the antenna, or vice versa, ensuring that communication quality is not compromised. Given that RF signals are susceptible to interference and decay rapidly, the shielding performance, dielectric material, and impedance matching of the feeder are particularly critical. The common 50Ω impedance design effectively reduces reflection and enhances transmission efficiency.
| Structure parameters | ||
| Item | Material | Diamenter (mm) |
| Diameter Over Dielectric | Foam PE | 4.82 |
| Diameter Over Jacket | PE | 7.36 |
| Inner Conductor OD | Copper-clad aluminum wire | 1.9 |
| Outer Conductor OD | Corrugated copper | 6.35 |
| Nominal Size | 1/4 in | |
| Performance parameters | |||
| Capacitor | 79.4pF/m | ||
| Impedance | 50ohm | ||
| Transmission rate | 82% | ||
| DC Resistance, Inner Conductor | 9.84 ohms/km | ||
| DC Resistance, Outer Conductor | 7.21 ohms/km | ||
| DC Test Voltage | 1600 V | ||
| Operating Frequency Band | 1-18000 MHz | ||
| Inductance | 0.2 µH/m | ||
| Insulation Resistance | 100000 MOhms-km | ||
| Jacket Spark Test Voltage (rms) | 5000 V | ||
| Peak Power | 6.4 kW | ||
| Working temperature range | -70～+85℃ | ||
| Bending radius | 25.4mm | ||
| ROHS/CE/FCC | YES | ||
| VSWR/Return Loss | Frequency Band | VSWR | Return Loss (dB) |
| 680–960 MHz | 1.16 | 23.1 | |
| 960-1700 MHz | 1.16 | 23.1 | |
| 1700–2200 MHz | 1.16 | 23.1 | |
| 2200–2700 MHz | 1.16 | 23.1 | |
The characteristics of 1/4 feeders include:
Good transmission performance: capable of efficiently transmitting radio frequency signals, ensuring communication quality and stability.
Excellent shielding performance: effectively shielding external electromagnetic interference through a mesh shielding layer, protecting the integrity of the signal.
Good flexibility and durability: appropriate size and material selection make the 1/4 feeder have good flexibility and durability while maintaining high performance.
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