RG316 Cable is a compact, flexible 50-ohm coaxial RF cable designed for reliable signal transmission in high-frequency electronic systems. Its small diameter and flexible construction make it especially useful where space is limited and cable routing requires tight bends. RG316 Cable is commonly associated with RF equipment, aerospace electronics, telecommunications, test and measurement systems, wireless communication equipment, and instrumentation.
A key characteristic of many RG316 Cable constructions is the use of a double-shield configuration. The additional shielding helps protect RF signals from electromagnetic interference and reduces unwanted signal leakage. Combined with a PTFE dielectric and silver-plated stranded conductor, RG316 Cable provides a useful combination of flexibility, compact size, thermal performance, and RF capability.
What Is RG316 Cable?
RG316 Cable is a 50-ohm flexible coaxial cable designed for RF and microwave signal transmission. A typical RG316 Cable construction consists of a stranded center conductor, PTFE dielectric, metallic shielding layers, and an outer protective jacket.
The compact construction allows RG316 Cable to be installed in equipment where larger coaxial cables may not fit. Its flexibility also makes it suitable for internal connections between RF components, instruments, antennas, modules, and electronic assemblies.
RG316 Cable Construction
Center Conductor
The center conductor carries the RF signal. RG316 Cable commonly uses a stranded silver-plated copper conductor. The stranded structure improves flexibility, while silver plating supports good conductivity and high-frequency performance.
PTFE Dielectric
PTFE is commonly used as the dielectric material in RG316 Cable. It electrically isolates the center conductor from the shielding system and contributes to the cable’s impedance, capacitance, velocity factor, and temperature performance.
Double Shield
The double-shield construction is an important feature of RG316 Cable. Multiple metallic shielding layers provide improved protection against external electromagnetic interference and help reduce RF leakage.
Outer Jacket
The outer jacket provides mechanical protection and helps protect the internal cable construction from abrasion, handling, and environmental exposure.
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RG316 Cable Specifications
| Specification | Typical Characteristic |
| Cable Type | Flexible RF Coaxial Cable |
| Impedance | 50 Ohms |
| Nominal Diameter | Approximately 2.5 mm |
| Center Conductor | Stranded Silver-Plated Copper |
| Dielectric | PTFE |
| Shielding | Double Shield |
| Construction | Flexible |
| Frequency Capability | RF and Microwave Applications |
| Connector Options | SMA, BNC, TNC, N-Type and Others |
| Typical Use | RF, Aerospace, Telecom, Instrumentation |
Exact electrical performance, attenuation, temperature rating, and frequency capability can vary according to manufacturer and cable construction.
Key Features of RG316 Cable
RG316 Cable offers several features that make it useful for compact RF systems:
- 50-ohm characteristic impedance
- Compact cable diameter
- Flexible construction
- Double-shield configuration
- Silver-plated stranded conductor
- PTFE dielectric
- Good electromagnetic protection
- High-temperature capability
- Low signal leakage
- Wide connector compatibility
- Easy installation in confined spaces
Technical Benefits of RG316 Cable
Compact Size
The small diameter of RG316 Cable makes it suitable for densely packed electronic systems. Engineers can route multiple cables within limited enclosure space without requiring large cable channels.
Excellent Flexibility
RG316 Cable is more flexible than semi-rigid RF cable. This makes it useful for internal equipment connections and installations where cables must be routed around components.
Double-Shield Protection
The double shielding helps reduce electromagnetic interference and unwanted RF coupling. This can be particularly useful in equipment containing multiple electronic circuits operating close to each other.
Temperature Performance
The PTFE dielectric used in many RG316 Cable constructions provides good thermal stability, making the cable suitable for applications requiring performance across a relatively wide temperature range.
Reliable RF Transmission
The controlled 50-ohm construction helps maintain impedance compatibility with standard RF equipment and minimizes signal reflections when correctly terminated.
Applications of RG316 Cable
Aerospace and Defense
RG316 Cable is suitable for compact RF connections in aerospace and defense electronics, including communication equipment, navigation systems, instrumentation, radar electronics, and other RF assemblies.
Telecommunications
It can be used in communication equipment, wireless modules, RF signal distribution systems, and internal connections within telecom hardware.
Test and Measurement
RG316 Cable is useful for connecting RF test instruments, signal generators, spectrum analyzers, network analyzers, and other laboratory equipment.
Medical Electronics
Compact RF cable assemblies can be used in specialized medical and laboratory equipment where reliable signal transmission and compact routing are required.
Industrial Electronics
RG316 Cable can be used in industrial instrumentation, sensors, control equipment, and electronic systems where electromagnetic protection and compact construction are important.
RG316 Cable Connector Options
RG316 Cable can be terminated with several RF connector types depending on the application.
Common options include:
- SMA
- BNC
- TNC
- N-Type
- SMB
- MCX
- MMCX
- SMP
Connector selection should consider the operating frequency, impedance, mechanical requirements, and equipment interface.
RG316 Cable vs RG400 Cable
| Feature | RG316 Cable | RG400 Cable |
| Impedance | 50 Ohms | 50 Ohms |
| Approx. Diameter | 2.5 mm | 4.95 mm |
| Construction | Flexible | Flexible |
| Shielding | Double Shield | Double Shield |
| Size | Smaller | Larger |
| Flexibility | Very High | High |
| Space Requirement | Very Low | Moderate |
| Typical Applications | Compact RF Assemblies | Aerospace, Defense, RF Systems |
RG316 Cable is generally preferred when compact size and flexibility are important, while RG400 can be selected where larger physical construction and different electrical requirements are appropriate.
How to Choose RG316 Cable
Before selecting RG316 Cable, consider the following:
- Required operating frequency
- 50-ohm impedance
- Cable length
- Insertion loss
- VSWR
- Temperature range
- Shielding requirement
- Connector type
- Power handling
- Installation space
- Mechanical flexibility
The manufacturer’s datasheet should always be checked for exact specifications.
Conclusion
RG316 Cable is a compact and flexible 50-ohm RF coaxial cable designed for reliable high-frequency signal transmission. Its small diameter, PTFE dielectric, stranded silver-plated conductor, and double-shield construction make it suitable for applications requiring compact routing, electromagnetic protection, and dependable RF performance.
From aerospace and defense to telecommunications, test equipment, instrumentation, and industrial electronics, RG316 Cable provides a practical solution for compact RF interconnections. Selecting the appropriate cable based on frequency, attenuation, temperature, connector type, power handling, and installation requirements helps achieve reliable long-term performance.
Frequently Asked Questions About RG316 Cable
1. What is RG316 Cable?
RG316 Cable is a flexible 50-ohm coaxial RF cable commonly used for high-frequency signal transmission in compact electronic and communication systems.
2. Is RG316 Cable double shielded?
Many RG316 Cable constructions use a double-shield configuration, providing improved protection against electromagnetic interference and RF signal leakage.
3. What is the impedance of RG316 Cable?
RG316 Cable is generally designed with a 50-ohm characteristic impedance.
4. What is the diameter of RG316 Cable?
RG316 Cable is commonly associated with an outside diameter of approximately 2.5 mm, although exact dimensions can vary by manufacturer.
5. What dielectric is used in RG316 Cable?
PTFE is commonly used as the dielectric material in RG316 Cable because of its electrical and thermal properties.
6. What is RG316 Cable used for?
RG316 Cable is used in aerospace, defense, telecommunications, RF test equipment, instrumentation, wireless communication, medical electronics, and industrial systems.
7. Which connectors are compatible with RG316 Cable?
Common connector options include SMA, BNC, TNC, N-Type, SMB, MCX, MMCX, and SMP, depending on the application.
8. Is RG316 Cable flexible?
Yes. RG316 Cable is highly flexible and is suitable for routing through compact electronic assemblies and confined installation spaces.
9. What is the difference between RG316 and RG400 Cable?
Both are commonly used as 50-ohm flexible RF cables, but RG316 has a smaller diameter and is particularly useful for compact installations, while RG400 has a larger construction and is commonly used where different mechanical or electrical requirements apply.
10. How do I select the right RG316 Cable?
Select RG316 Cable based on operating frequency, impedance, cable length, attenuation, VSWR, temperature requirements, shielding, connector type, power handling, and available installation space.
