HUBER+SUHNER QMA is a subminiature connector with 50Ω impedance. The frequency range extends to 18 GHz, but most QMA connectors are Return Loss optimized for frequencies up to 6 GHz. The interface is based on the SMA dimension, but uses a new snap-lock mechanism for coupling. The QMA interface offers similar performance to SMA, but with an easier, faster, and safer coupling operation. The packaging density of QMA is increased compared to SMA connectors. QMA is not intermateable with SMA.
The QMA series from Huber+Suhner offers a snap‑dock coupling mechanism that replaces the traditional threaded SMA interface, delivering faster, torque‑free assembly and higher packaging density. Features include cycle‑time improvement, free‑rotating connections, and IP50 (IP68 variant) protection.
The datasheet lists electrical, mechanical, and environmental specifications such as 50 Ω impedance, up to 18 GHz frequency range, 1000 V dielectric voltage, and a temperature range of –40 °C to +85 °C, along with material details and recommended calibration methods for accurate VSWR measurements.
| Frequency range | DC‑6 GHz optimized, up to 18 GHz working |
|---|---|
| Dielectric withstanding voltage | 1000 V rms, 50 Hz |
| Working voltage | ≤ 480 Vrms, 50 Hz |
| Insulation resistance | 5‑10³ MΩ |
| Centre contact resistance | 3 mΩ |
| Return loss (typical) | DC‑3 GHz = 32 dB; 3‑6 GHz = 25 dB |
| Engagement force (typical) | 25 N |
| Retention force for interface | 60 N |
| Durability (matings) | 100 cycles |
| Temperature range | -40 °C to +85 °C |
It is optimized for frequencies up to 6 GHz and works up to 18 GHz.
The retention force for the interface is 60 N.
The connector is rated for 100 mating cycles.