Comprehensive Guide to Standard Coaxial Connectors

1. Fundamental Categories

Coaxial connectors are classified by frequency range and physical dimensions:

A. Sub-GHz Connectors

• BNC: Bayonet-style (0-4GHz), 50Ω/75Ω variants
• TNC: Threaded BNC derivative (0-11GHz)
• N-Type: Robust design (0-18GHz), 12mm diameter

B. Microwave Connectors

• SMA: Semi-precision (0-18GHz), 6mm hex nut
• 3.5mm: Air-dielectric (0-34GHz), genderless design
• 2.92mm (K-Type): DC-40GHz, compatible with SMA

2. Critical Selection Parameters

3. Modern Hybrid Solutions

• QMA: Quick-lock SMA alternative (industry standard IEC 61169-10)
• MCX: Micro-miniature (0-6GHz) for IoT devices

4. Industry Standards Compliance

• Military: MIL-STD-348B
• Commercial: IEC 61169 series
• Automotive: USCAR-18 vibration specs

5. Emerging Technologies

• 5G mmWave connectors (1.0mm interface)
• Photonic-coaxial hybrids for 800G Ethernet
• Self-diagnosing smart connectors with embedded sensors