RG316 Cable Double Shield is a compact, flexible coaxial RF cable designed for reliable transmission of radio frequency signals in applications where space, flexibility, shielding, and signal integrity are important. It is widely used in telecommunications, wireless communication, GPS, test and measurement equipment, aerospace electronics, defense systems, industrial controls, and RF assemblies.
The RG316 cable family is well known for its small diameter and flexibility. A double-shielded RG316 configuration adds an additional layer of electromagnetic protection around the dielectric and center conductor, helping reduce unwanted interference and signal leakage compared with a basic single-shield construction.
RG316 Double Shield Cable is particularly useful for compact RF assemblies where the cable must be routed through limited spaces while maintaining controlled impedance and dependable high-frequency performance. It is commonly terminated with RF connectors such as SMA, BNC, TNC, N-Type, MMCX, MCX, and other miniature RF interfaces.
The exact electrical performance of an RG316 cable depends on the manufacturer, construction, dielectric, shielding configuration, connector assembly, and operating frequency. Therefore, engineers should always verify the manufacturer’s datasheet before selecting a cable for a specific RF application.
What Is RG316 Cable Double Shield?
RG316 Cable Double Shield is a 50-ohm coaxial RF cable based on the RG316 cable format and incorporating two shielding layers. Its basic construction consists of a center conductor, dielectric insulation, first shield, second shield, and protective outer jacket.
The center conductor carries the RF signal, while the dielectric maintains the spacing between the conductor and shield. The two shielding layers provide enhanced protection against electromagnetic interference and help prevent RF energy from escaping the cable.
A typical double-shield configuration can consist of a metallic foil layer combined with a braided shield, or two braided/foil shielding layers depending on the cable design.
This construction makes RG316 Double Shield Cable suitable for applications where reliable RF transmission and improved shielding are required in a compact cable assembly.
Why Is Double Shielding Important?
Shielding is particularly important when RF cables operate near other electronic circuits, power cables, digital electronics, antennas, or sources of electromagnetic interference.
A double-shielded cable provides two layers of protection between the signal conductor and the external environment.
The first shield helps block electromagnetic interference and limits signal radiation.
The second shield provides additional isolation and improves overall shielding effectiveness.
The result can be improved electromagnetic compatibility, reduced signal leakage, and greater protection against external noise.
However, shielding performance depends on the actual shield materials, coverage percentage, termination quality, frequency, connector design, and cable construction. A double shield does not automatically guarantee a specific shielding effectiveness.
Construction of RG316 Double Shield Cable
Center Conductor
The center conductor carries the RF signal through the cable.
RG316 cables commonly use silver-plated copper or silver-plated copper-clad steel conductors, depending on the manufacturer’s construction.
Silver plating provides good electrical conductivity and corrosion resistance and is particularly useful in high-frequency applications.
Dielectric
The dielectric is the insulating material surrounding the center conductor.
PTFE is commonly associated with RG316 constructions because of its excellent electrical properties, temperature resistance, and low dielectric loss.
The dielectric maintains the required spacing between the center conductor and the shielding system, which contributes to the cable’s characteristic impedance.
First Shield
The first shielding layer surrounds the dielectric.
Depending on the cable design, this layer may be made from:
- Tinned copper braid
- Silver-plated copper braid
- Copper foil
- Aluminum foil
- Combination foil and braid
The first shield provides the initial barrier against electromagnetic interference.
Second Shield
The second shield provides another conductive barrier around the first shield.
This additional layer improves isolation between the RF signal and surrounding electronics and can reduce unwanted RF leakage.
The exact shield configuration should be checked against the cable manufacturer’s specifications.
Outer Jacket
The outer jacket protects the cable from mechanical damage, abrasion, moisture, chemicals, and environmental exposure.
Common jacket materials depend on the intended application and may include fluoropolymer or other RF-compatible materials.
How Does RG316 Double Shield Cable Work?
RG316 Double Shield Cable operates according to the principles of coaxial transmission.
The RF signal travels through the center conductor. The dielectric surrounds the conductor and maintains a controlled geometry. The surrounding conductive shields act as the return path and electromagnetic barrier.
Because the signal conductor and shield are arranged concentrically, the electromagnetic field is largely contained within the cable structure.
This controlled structure helps the cable maintain a predictable characteristic impedance, typically 50 ohms for RG316 RF applications.
When properly terminated with compatible 50-ohm RF connectors, the cable can provide reliable signal transmission with controlled reflections and predictable RF performance.
Key Features of RG316 Cable Double Shield
Important characteristics include:
- 50-ohm characteristic impedance
- Compact outer diameter
- Lightweight construction
- High flexibility
- Double shielding
- Good EMI protection
- Excellent routing capability
- PTFE dielectric in common constructions
- Silver-plated conductor options
- Wide RF application range
- Compatibility with many RF connectors
- Suitable for custom cable assemblies
- Reliable performance in compact RF systems
RG316 Double Shield Cable Specifications
The exact specifications vary between manufacturers and cable constructions. A typical specification profile may include the following:
| Parameter | Typical RG316 Double Shield Characteristics |
|---|---|
| Cable Type | RG316 Coaxial RF Cable |
| Characteristic Impedance | 50 Ohms |
| Construction | Coaxial |
| Shielding | Double Shield |
| Dielectric | PTFE in common constructions |
| Center Conductor | Silver-plated conductor options |
| Cable Diameter | Approximately 2.5 mm |
| Frequency Capability | Application dependent |
| Temperature Range | Manufacturer dependent |
| Flexibility | High |
| Applications | RF, Microwave, GPS, Telecom, Test Equipment |
These values should be treated as general guidance rather than universal RG316 specifications. Cable performance can vary significantly between manufacturers.
Frequency Range of RG316 Cable
RG316 is commonly used for RF applications extending into the GHz frequency range. The usable frequency depends on attenuation requirements, cable length, connector quality, installation conditions, and the specific manufacturer’s construction.
Short RG316 cable assemblies can be particularly useful in high-frequency equipment because their compact dimensions allow convenient routing between RF components.
For higher-frequency applications, engineers should evaluate insertion loss, VSWR, return loss, phase stability, and connector performance at the actual operating frequency.
Attenuation and Signal Loss
All RF cables introduce some signal attenuation.
The attenuation of RG316 depends on:
- Operating frequency
- Cable length
- Conductor material
- Dielectric construction
- Shield configuration
- Connector quality
- Temperature
As frequency increases, cable attenuation generally increases. For this reason, RG316 is often preferred for short RF interconnections rather than very long transmission runs.
When selecting RG316 Double Shield Cable, engineers should compare attenuation per meter or per foot at the actual operating frequency.
VSWR and Return Loss
VSWR and return loss are important specifications for RF cable assemblies.
VSWR indicates the degree of impedance mismatch within the RF transmission path.
Return loss indicates the amount of signal reflected toward the source.
A properly manufactured 50-ohm RG316 cable assembly with high-quality connectors can provide good impedance matching. However, poor connector installation, damaged cable geometry, excessive bending, or incorrect termination can negatively affect VSWR.
Double Shielding and EMI Protection
One of the main advantages of RG316 Double Shield Cable is improved protection against electromagnetic interference.
The double shielding system helps isolate the RF signal from nearby electrical equipment and reduces the possibility of unwanted signal coupling.
This is particularly valuable in environments containing:
- Digital circuits
- Switching power supplies
- Motors
- High-current wiring
- Wireless transmitters
- Computers
- Industrial controllers
- Laboratory instruments
For sensitive measurement systems, improved shielding can help maintain measurement accuracy and reduce unwanted noise.
Applications of RG316 Double Shield Cable
GPS and Navigation Systems
RG316 cable assemblies are frequently used for connecting GPS antennas, receivers, navigation modules, and RF components.
Its compact size makes it useful in equipment where installation space is limited.
Telecommunications
The cable can be used for internal RF connections within communication equipment, wireless modules, antennas, and radio systems.
Aerospace Electronics
Lightweight and compact RF cables are valuable in aerospace systems where equipment size and weight are important design considerations.
Applications may include:
- Avionics
- Navigation systems
- Communication equipment
- RF instrumentation
- Satellite electronics
Defense Systems
RG316 Double Shield Cable can be used for internal RF interconnections in defense and military electronic equipment where shielding and reliable signal transmission are important.
RF Test and Measurement
Laboratories use compact RF cable assemblies to connect:
- Spectrum analyzers
- Signal generators
- Network analyzers
- RF power meters
- Antennas
- Test fixtures
Wireless Communication
The cable can connect antennas, radios, transceivers, filters, amplifiers, and other RF components.
IoT Devices
Compact RF cable assemblies can be used inside IoT gateways, wireless sensors, communication modules, and embedded RF equipment.
Industrial Electronics
Industrial control systems can use shielded RF cables for reliable connections between wireless modules and antennas.
Advantages of RG316 Cable Double Shield
Compact Size
RG316 has a small diameter, making it suitable for crowded equipment and compact RF assemblies.
High Flexibility
Its flexible construction allows routing around corners and through limited installation spaces.
Improved Shielding
Double shielding provides additional protection from external electromagnetic interference.
Lightweight
The small size and relatively low weight make it suitable for portable and aerospace electronics.
Reliable RF Performance
Properly manufactured RG316 cable assemblies provide predictable 50-ohm RF transmission.
Wide Connector Compatibility
RG316 cables can be terminated with many commonly used RF connectors.
Custom Assembly Options
Cable assemblies can be manufactured in specific lengths with different connector combinations.
Limitations of RG316 Double Shield Cable
RG316 Double Shield Cable is not the ideal choice for every RF application.
Important limitations include:
- Higher attenuation than larger low-loss coaxial cables
- Limited power handling compared with larger RF cables
- Performance decreases as frequency and cable length increase
- Not ideal for very long RF transmission paths
- Excessive bending can affect electrical performance
- Connector termination quality is critical
For long-distance RF transmission, larger low-loss coaxial cables may provide significantly better performance.
RG316 Double Shield vs RG58
| Feature | RG316 Double Shield | RG58 |
|---|---|---|
| Diameter | Smaller | Larger |
| Flexibility | Excellent | Good |
| Shielding | Double shield | Typically single braid/shield construction |
| Weight | Lightweight | Heavier |
| Installation Space | Excellent | Moderate |
| Typical Impedance | 50 Ohms | 50 Ohms |
| Power Handling | Lower | Generally higher |
| Long Cable Runs | Less suitable | More suitable |
| Compact RF Assemblies | Excellent | Good |
RG316 Double Shield vs RG174
| Feature | RG316 Double Shield | RG174 |
|---|---|---|
| Impedance | 50 Ohms | 50 Ohms |
| Size | Compact | Compact |
| Shielding | Double shield | Construction dependent |
| Flexibility | High | High |
| EMI Protection | Enhanced | Application dependent |
| RF Assemblies | Excellent | Excellent |
| High-Frequency Applications | Suitable | Suitable depending on specification |
How to Choose the Right RG316 Double Shield Cable
Before purchasing an RG316 Double Shield Cable, evaluate the following parameters.
Operating Frequency
Confirm that the cable is rated for the required frequency.
Cable Length
Longer cables introduce greater attenuation. Use the shortest practical cable for sensitive high-frequency applications.
Connector Type
Select connectors that match the equipment interface.
Popular options include:
- SMA
- BNC
- TNC
- N-Type
- MCX
- MMCX
- SMB
- SMC
Shielding Requirement
If the cable operates in an electrically noisy environment, a double-shielded construction can provide additional protection.
Temperature
Verify the cable’s operating temperature range, particularly for aerospace, outdoor, industrial, and high-temperature applications.
Flexibility
Choose a cable construction appropriate for the installation. Avoid repeatedly flexing a cable that is intended primarily for static routing.
RG316 Cable Connector Options
RG316 Double Shield Cable assemblies can be manufactured with many connector combinations.
Common configurations include:
SMA Male to SMA Male
Useful for RF equipment interconnections.
SMA Male to N-Type Male
Useful for connecting compact RF equipment to larger antenna or communication interfaces.
SMA Male to BNC Male
Useful in laboratory and test equipment.
SMA Male to MMCX Male
Useful for compact wireless and embedded RF equipment.
SMA Female to SMA Female
Used for panel and equipment interconnections.
Custom connector combinations can be specified according to the equipment requirements.
Installation Best Practices
Correct installation is essential for maintaining RF performance.
Avoid sharp bends.
Do not exceed the recommended bend radius.
Avoid crushing the cable.
Do not pull the cable by its connector.
Use appropriate RF connector torque.
Keep mating surfaces clean.
Protect outdoor connections from moisture.
Avoid unnecessary cable length.
Inspect connectors before installation.
Proper installation helps maintain impedance consistency and reduces the risk of performance degradation.
Why Choose a Custom RG316 Cable Assembly?
A custom RG316 Double Shield Cable Assembly provides a ready-to-install solution manufactured according to specific application requirements.
Customization can include:
- Cable length
- Connector type
- Connector gender
- Straight connectors
- Right-angle connectors
- Heat-shrink identification
- Labeling
- Protective sleeving
- Connector plating
- Customized termination
Custom assemblies reduce installation time and help ensure compatibility with the target RF equipment.
Quality Considerations
When purchasing RG316 Double Shield Cable, quality should be evaluated beyond the cable’s name.
Important considerations include:
- Material quality
- Conductor construction
- Shield coverage
- Dielectric consistency
- Connector quality
- Termination workmanship
- VSWR
- Insertion loss
- Return loss
- Temperature rating
- Manufacturer testing
A cable that simply carries an RG316 designation may not have identical performance to another manufacturer’s cable. Always compare the actual datasheet.
Future of Compact Shielded RF Cables
The continued development of wireless communication, IoT, satellite systems, aerospace electronics, and high-density RF equipment is increasing the need for smaller and more efficient RF interconnects.
Future cable assemblies are expected to focus on improved shielding effectiveness, lower attenuation, higher-frequency operation, better phase stability, smaller connectors, lightweight materials, and improved environmental resistance.
Compact double-shielded RF cables will continue to be useful wherever engineers need reliable RF connections within increasingly dense electronic systems.
Conclusion
RG316 Cable Double Shield is a compact, flexible, 50-ohm RF coaxial cable designed for applications requiring reliable signal transmission and enhanced electromagnetic shielding. Its small diameter, flexible construction, double shielding, and compatibility with a wide range of RF connectors make it particularly suitable for GPS, telecommunications, aerospace, defense, wireless communication, laboratory testing, IoT, and industrial electronics.
When selecting an RG316 Double Shield Cable, engineers should consider operating frequency, cable length, attenuation, VSWR, shielding construction, connector type, power handling, temperature range, and installation requirements. For demanding RF systems, choosing a properly specified and professionally terminated cable assembly can significantly contribute to reliable signal transmission and long-term system performance.
Frequently Asked Questions (FAQs)
1. What is RG316 Double Shield Cable?
RG316 Double Shield Cable is a compact 50-ohm coaxial RF cable featuring two shielding layers for improved electromagnetic protection and reliable high-frequency signal transmission.
2. What is RG316 cable used for?
RG316 is commonly used for GPS, wireless communication, telecommunications, aerospace electronics, defense systems, RF test equipment, IoT devices, and compact RF assemblies.
3. What is the impedance of RG316 cable?
RG316 is commonly designed with a 50-ohm characteristic impedance, making it suitable for many RF and microwave systems.
4. What does double shield mean in RG316 cable?
Double shield means the cable incorporates two conductive shielding layers around the dielectric and center conductor. The additional shielding can improve EMI protection and reduce signal leakage.
5. Is RG316 cable flexible?
Yes. RG316 is known for its compact and flexible construction, making it suitable for routing through tight spaces and compact electronic equipment.
6. Can RG316 Double Shield Cable be used for high-frequency applications?
Yes. RG316 is widely used for RF applications extending into the GHz range. The maximum usable frequency depends on the specific cable construction, length, connectors, and required performance.
7. Which connectors can be used with RG316 cable?
Common connector options include SMA, BNC, TNC, N-Type, MCX, MMCX, SMB, and SMC. The exact connector should match the equipment interface and frequency requirements.
8. Is RG316 suitable for long-distance RF transmission?
RG316 is generally better suited to short RF interconnections because its small size results in greater attenuation than larger low-loss coaxial cables. For long runs, a low-loss cable may be more appropriate.
9. What is the difference between RG316 and RG58?
RG316 is smaller, lighter, and more flexible, making it ideal for compact RF assemblies. RG58 is larger and generally offers better power handling and lower attenuation for many applications.
10. Why should I choose double-shielded RG316 instead of single-shield cable?
Double-shielded RG316 can provide improved isolation from electromagnetic interference and reduced signal leakage, making it beneficial for sensitive RF equipment and electrically noisy environments.
11. Can RG316 cable be customized?
Yes. RG316 cable assemblies can be customized according to cable length, connector type, connector gender, right-angle or straight configuration, labeling, sleeving, and other assembly requirements.
12. What should I check before buying RG316 Double Shield Cable?
Check the cable’s impedance, frequency range, attenuation, VSWR, shielding construction, cable diameter, temperature rating, power handling, connector type, and manufacturer test specifications.
