How to customize SMA connector Cable？

How to customize SMA connector Cable？

• 2025-09-09 10:25:43
• by Admin

The SMA connector (SubMiniature version A connector) is a commonly used coaxial RF connector. It is compact, stable in performance, and widely applied in RF communication systems.

The main features of SMA connector:

• Compact size: The outer thread diameter is approximately 6.35 mm (1/4 inch), hence the name “SubMiniature.”
• Interface type: Threaded connection (commonly 1/4"-36 thread), ensuring firm mating and vibration resistance.
• Material: Typically made of brass or stainless steel with gold or nickel plating on the surface. The inner pin is often gold-plated for low loss and corrosion resistance.

SMA Connector Configuration:

• SMA Male: With external threads and a center pin.
• SMA Female: With internal threads and a center socket.
• Reverse-Polarity SMA (RP-SMA): Similar in appearance to SMA but with the pin/socket reversed. Commonly used in WiFi devices (e.g., routers and antenna ports).

How to Customize an SMA Connector Cable

The general process of customizing a Cable with SMA connectors can be divided into the following steps: Selection → Cable Cutting → Stripping → Assembly → Crimping/Soldering → Testing.

Step-by-step Process:

• Selection: Choose the appropriate coaxial cable (commonly RG-316, RG-58, LMR series, etc.) and SMA connector type (male/female, straight/right-angle, SMA or RP-SMA).
• Cutting and Stripping: Cut the cable to the required length. Carefully strip the outer jacket, expose the braid, and reveal the dielectric and center conductor. The stripping length must comply with the connector specifications, typically provided in the connector’s datasheet.
• Connector Assembly: Slide the crimp ferrule onto the cable first. Insert the cable into the connector body, ensuring the center conductor enters the pin receptacle, the dielectric fits tightly, and the braid is flared over the connector body.
• Fixing: Center Pin-Secure by crimping or soldering ; Outer Shield-Crimp the braid onto the connector housing by pressing the ferrule with a crimping tool.
• Reinforcement and Protection: Apply heat shrink tubing for durability, strain relief, and a professional finish.
• Testing: Use a multimeter to check for continuity (center-to-center, shield-to-shield) and ensure no short circuit. Then verify RF performance with a Vector Network Analyzer (VNA) or a VSWR meter to confirm compliance with requirements.
• Key Point: Precise stripping, reliable contact, and secure crimping are essential for ensuring stable performance and low loss in the finished harness.

Kaweei Custom SMA Cable FAQ

Q : What types of cables can Kaweei customize?

A : We support a wide range of coaxial cables such as RG-174, RG-316, RG-58, and LMR series, selected based on frequency, flexibility, and application needs.

Q : What types of SMA connectors are available?

A : We provide SMA and RP-SMA connectors in male/female, straight or right-angle options. All use high-quality materials with gold-plated contacts to ensure low loss and stable performance.

Q : How does Kaweei ensure harness quality?

A : We apply strict process control with precise stripping and crimping, and verify each harness using a Vector Network Analyzer (VNA) for VSWR/return loss to ensure reliable electrical and mechanical performance.