Recommended Coaxial Cable Types for SMA Connectors

SMA (SubMiniature version A) connectors are widely used for high-frequency RF signal transmission. While much attention is paid to connector quality, the choice of compatible coaxial cable is equally important.

This article compares popular SMA-compatible cables—RG-316, RG-402, RG-405, Sucoflex 100, and LDF1-50—to help you select the ideal cable for your system design.

5 Key Factors When Selecting a Cable for SMA Connectors

Here's a quick checklist to guide your cable selection:

Frequency Support:
Make sure the cable supports the operating frequency of your SMA system to prevent signal loss and distortion.
Insertion Loss:
Lower insertion loss means better signal strength and stability—especially crucial in 5G, millimeter-wave, or other high-frequency environments.
Flexibility & Mechanical Properties:
Choose flexible cables for compact or dynamic installations; opt for semi-rigid cables when stability and low loss are priorities.
Impedance Matching:
SMA connectors are designed for 50Ω systems. Using a mismatched cable (e.g., 75Ω) can cause return loss and performance issues.
Cable Length Consideration:
The longer the cable, the greater the signal loss—especially at higher frequencies. Use low-loss cables and keep cable runs short where possible.

Cable Comparison Table: Frequency, Flexibility & Use Cases

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Cable Type	Frequency Range	Flexibility	Insertion Loss	Common Applications
RG-316	DC – 6GHz	High flexibility	Moderate	Wi-Fi modules, IoT, general RF use
RG-402	DC – 18GHz	Low Flexibility (Semi-Rigid / Rigid)	Low	Test equipment, radar, aerospace
RG-405	DC – 18GHz	Low Flexibility (Semi-Rigid / Rigid)	Low	Military devices, mobile RF modules
LDF1-50	DC – 10GHz	Low Flexibility (Semi-Rigid)	Very Low	Long-distance links, base station feeds
Sucoflex 100	DC – 26.5GHz	Medium Flexibility	Ultra Low	Precision measurement, aerospace systems

Recommended Cables for Different Applications

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Application Scenario	Recommended Cable	Key Benefits
General RF Communication	RG-316	Cost-effective, ideal for short or internal runs
Military & Portable Outdoor Use	RG-405	Flexible and rugged for harsh environments
High-Frequency Test / Radar	RG-402 / Sucoflex	Low loss, high bandwidth, precise transmission
Base Station / High Power	LDF1-50	Extremely low loss, supports high power

Maximize Your SMA System’s Performance with the Right Cable

The right coaxial cable boosts signal transmission, extends system life, and ensures stable performance. Whether you're designing test systems, communication modules, or 5G RF platforms, understanding cable properties helps you make better design choices.

Looking for SMA connectors with pre-assembled cables? We provide complete assembly solutions.

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SMA Cable Selection Q&A

Q1: Can I use a 75Ω cable with an SMA connector?
A: Not recommended. SMA connectors are designed for 50Ω systems. Using a 75Ω cable can cause impedance mismatch, resulting in signal reflection and performance loss.

Q2: Which cable is best for tight cabinet installations?
A: For space-limited setups, flexible cables like RG-316 are easier to route and service. However, for high-frequency precision applications, semi-rigid options like RG-405 are better due to lower insertion loss.

Q3: What’s the typical use case for Sucoflex cables with SMA connectors?
A: Sucoflex cables support up to 26.5 GHz with ultra-low loss. They're ideal for high-precision RF testing, radar modules, and aerospace systems, where reliability is critical.