Product introduction
Product Introduction
SMA female head to SMA male head
Cable: RG405/U semi-rigid coaxial cable
Interface Type: SMA
Cable length: 5cm~200cm (length can be customized)
RG405/U Semi-Rigid Coaxial Cable Parameter Description
1. Core parameters
parameter | Typical values | standard |
characteristic impedance | 50Ω | Compliant with IEEE standard RF output impedance |
Outside diameter | 6.2mm (0.244") | With a tolerance of ± 0.08mm, the copper tube housing provides mechanical strength |
Central conductor | Silver-clad copper-clad steel (SCS) | Diameter 1.47mm, silver layer enhances high-frequency conductivity, steel core tensile strength |
Insulation | Solid Teflon (PTFE) | Low dielectric loss, temperature resistance -65°C ~ +200°C |
Outer conductor | Seamless copper pipe | 100% shielding performance with immunity to electromagnetic interference (EMI) > 120 dB |
jacket | No (bare copper tube) or optional polyimide coating | Bare tube can be directly grounded, and the coating is anti-oxidation (optional) |
Frequency range | DC ~ 18 GHz | At 18GHz still maintains a low VSWR |
attenuation | Typical values: • 1 GHz: 0.23 dB/m • 10 GHz: 0.82 dB/m • 18 GHz: 2.87 dB/m |
The measured value fluctuates by 10% due to the joint process± |
Voltage VSWR |
| Requires precision connectors (e.g. SMA 3.5mm) |
Maximum operating voltage | 1,500 Vrms (Sea Level) | decreases with altitude |
Minimum bend radius | 50 mm (static) | Excessive bending leads to permanent deformation of copper pipes and deterioration of high-frequency performance |
Operating temperature range |
| Short-term tolerance to +200°C (insulation limit) |
Speed of transmission | 82% speed of light | Determined by the dielectric constant of PTFE |
2. Contrast flexible cables
characteristic | RG405 semi-rigid | Flexible coaxial line LMR-400 |
Shielding efficiency | >120dB | 90 ~100dB |
18GHz loss | 2.87dB/m | >6.0dB/m |
Bendability | It needs to be preformed and cannot be dynamic | Can be bent repeatedly |
Phase stability | ±0.1°@10GHz | ±2°@10GHz |
3. Typical applicable scenarios
Military radar: fire control system, phased array antenna feed network
Polar satellite communication: spaceborne high-frequency transceiver interconnection
Test Instruments: Vector Network Analyzer (VNA) Calibration Line Medical Devices: Linear Accelerator (Radiotherapy) Microwave Transmission
Selection guide
1. Specifications and characteristics of commonly adapted cables
Model | Outside diameter | Central conductor | 3GHz loss | peculiarity | Applicable scenarios |
RG-174 | 2.8mm | 7*0.16mm | 0.82dB/m | Flexible, easy to install, and low cost | Consumer electronics |
RG-316 | 2.6mm | 7*0.1mm | 0.84dB/m | High temperature resistance, military industry standards | High temperature environment, test instruments |
Micro foamed PE wire | 1.5~2.2mm | 0.3~0.5mm | 0.50dB/m | High frequency loss is low | 5G/Wi-Fi |
Semi-steel wire | 1.0~3.0mm | Solid copper | 0.30dB/m | Relatively stable and good shielding | Test calibration, mmWave front |
2. Comparison of key parameters and selection logic
2.1 Electrical performance priority
parameter | RG-174 | RG-316 | Foamed PE wire | effect |
Decay @6GHz | 1.8dBm/m | 1.7dBm/m | 0.9dBm/m | High-frequency signal integrity |
Shielding efficiency | 70dB | 90dB | >90dB | Anti-interference ability |
Impedance stability | ±3Ω | ±2Ω | ± 1Ω | Reflected signal suppression |
2.2 Mechanical and environmental adaptability
parameter | RG-174 | RG-316 | Foamed PE wire |
Minimum bend radius | 15mm | 25mm | 30mm |
Temperature range | -40℃ ~ +85℃ | -65℃ ~ +200℃ | -50℃ ~ +85℃ |
tensile strength | medium | Tall | Low (easily damaged) |
3. Typical application scenarios are matched with cables
3.1 Consumer electronics (Bluetooth/Wi-Fi）Cable: RG-174
Reason: Cost-sensitive, frequency ≤5GHz, short length (<0.3m) and controllable loss.
3.2 Test instrument jumper (vector network analyzer)
Cable: RG-316 or low-loss foam cable (such as Times LMR-200)
Reason: It needs to be resistant to plugging and low loss (high calibration accuracy requirements).
3.3 On-board radar/5G small base station
Cable: PTFE insulated foam cable (such as Gore G-FLEX
Reason: 6~24GHz low loss demand, outer diameter ≤2mm is convenient for wiring.
3.4 Military equipment
Cable: RG-316 (military standard MIL-DTL-17)
Reason: Resistant to extreme temperature and vibration, high shielding requirements.
4. Supplementary explanation
4.1 Outer diameter mismatch: MCX connectors usually support 1.0~3.0mm wire diameter, and those beyond the range need to be customized (such as micro-wires need a special MCX head).
4.2 High-frequency loss: The loss of RG-174 is twice as high as that of foam PE line at 6GHz, and long-distance transmission should be avoided.
4.3 Phase stability: Semi-rigid cable or stable phase cable (such as Huber+Suhner S100) is preferred for phase-sensitive applications (phase-controlled arrays).
4.4 Connector grade: Choose gold-plated contact MCX (non-nickel-plated) to ensure a life of >500 plugs.
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SMA female head to SMA male head
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