What are QMA Connectors?

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Editorial Team - everything RF

Mar 8, 2019

The QMA Connector was developed as snap-on locking replacement for the standard SMA connectors. This connector has the same internal construction as an SMA connector and exhibits similar RF performance characteristics and mechanical durability. The main difference is that QMA connectors feature a 360º rotating snap-on locking interface that is quick to install, has low RF leakage and is tool-less.

QMA connectors are most commonly used in cellular base station hardware, SCADA radios, and a range of wireless test equipment. They are also suitable in military hardware such as radar and satellite systems, where durability, strength, and quick-disconnection features are desired.

The QMA connector series is developed by the Quick Lock Forum (QLF) Alliance in 2003. This alliance includes RF interconnect companies with certified inter-mateable QMA and QN connectors, which are quick disconnect versions of the SMA and Type N connectors. Both offer a more convenient installation with its patented snap-on interface in place of a threaded coupling. Only QLF Alliance members can guarantee product inter-mateability between manufacturers. The members are Huber+Suhner AG, Radiall SA, Rosenberger and Amphenol RF.

Key Specifications of QMA Connectors:

  • Impedance: 50 Ω
  • Frequency range: DC - 6 GHz (optimized); DC to 18 GHz (Working range)
  • Coupling Mechanism: Quick Lock Coupling
  • Dielectric Withstanding Voltage (Sea Level): 1000 VRMS 50 Hz
  • Mating Durability: 100 mating cycles
  • Temperature range: -40°C / +105°C

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