3.5 mm RF Coaxial Connectors — Precision Meets High-Frequency Performance

The Connector Built for the Highest Standards

When engineers test, measure, or transmit at frequencies beyond 26.5 GHz, even the smallest imperfection can distort results. That’s why the 3.5 mm RF coaxial connector series was designed — to deliver laboratory-grade precision and field-ready reliability.

These connectors are the quiet heroes behind microwave test benches, 5G millimeter-wave systems, and satellite communication networks. With high return loss, excellent VSWR, and tight mechanical tolerances, they ensure every decibel of signal passes cleanly, without reflection or drift.

A Legacy of Precision Engineering

The 3.5 mm connector was originally developed to extend the capabilities of the SMA family into higher frequencies. By maintaining the same threaded interface but improving mechanical alignment and dielectric spacing, it became one of the first commercially available precision RF connectors capable of 34 GHz operation.

Unlike SMA connectors, the 3.5 mm design uses air dielectric and robust stainless-steel construction, preventing deformation and maintaining intermateability with both SMA and 2.92 mm (K-type) connectors.

This combination of compatibility, strength, and frequency performance has made the 3.5 mm connector an industry favorite in test instrumentation and RF module calibration.

Technical Mastery at 26.5–34 GHz

High-frequency design is about control — of geometry, impedance, and reflection. Every 3.5 mm RF connector is machined with sub-micron accuracy, ensuring a constant 50 Ω impedance and a VSWR typically below 1.15:1 across the entire operating range.

The result is consistent, low-loss signal transmission for vector network analyzers (VNA), spectrum analyzers, and microwave transceivers. Each connector is built from stainless steel with gold-plated beryllium copper contacts, ensuring durability, conductivity, and repeatable precision.

Engineering Advantages

Frequency Range: DC to 34 GHz

   Impedance: 50 Ω

   VSWR: ≤ 1.15:1 typical

   Power Handling: Up to 20 W (at 18 GHz)

   Coupling Mechanism: Threaded, compatible with SMA and 2.92 mm (K) connectors

   Materials: Stainless steel body, gold-plated contacts, air dielectric

   Environmental: –55°C to +165°C; corrosion and vibration resistant

   Compliance: RoHS and REACH certified

These mechanical and electrical properties allow the 3.5 mm series to excel where signal precision and reproducibility matter most.

Precision You Can Measure

In RF test and measurement, repeatability is everything. Each connector is designed for thousands of mating cycles, ensuring accuracy across every test. Whether it’s calibrating a network analyzer, connecting a microwave signal chain, or integrating a 5G radio prototype, the 3.5 mm connector guarantees stable and repeatable performance.

Laboratories and telecom R&D centers rely on these connectors to validate S-parameters, insertion loss, and phase stability under controlled and field conditions. The result is clear: reliable data, consistent results, and minimal signal uncertainty.

Real-World Applications

Microwave & Millimeter-Wave Testing: Stable interconnects for calibration and signal analysis up to 34 GHz

5G Infrastructure & Modules: Compact, high-precision links for mmWave baseband systems

Aerospace RF Systems: Reliable performance in vibration and thermal extremes

Military Radar & ECM Systems: High-frequency ruggedization for mission-critical equipment

Precision Instrumentation: Low-VSWR connectors for vector network analyzers, oscilloscopes, and synthesizers

Wherever accuracy meets frequency, 3.5 mm RF coaxial connectors define the benchmark for repeatable high-frequency performance.

Built for the Future of High-Frequency Design

As 5G and satellite networks extend into millimeter-wave frequencies, the 3.5 mm connector continues to serve as a bridge between laboratory performance and field application. Its SMA backward compatibility ensures smooth integration in mixed-frequency systems, while its mechanical precision supports the push toward 40 GHz and beyond.

For engineers, that means freedom — to design, test, and deploy without compromise.

For system integrators, it means reliability — a connection that performs exactly as predicted, every time.

Global Supply & Customization

We provide a full range of 3.5 mm RF coaxial connectors, including male, female, adapter, and panel-mount configurations. Custom mechanical tolerances, plating finishes, and phase-matched pairs are available for critical measurement setups.

All connectors undergo 100% VSWR and insertion loss testing before shipment. We support stock sourcing, BOM kitting, short lead times, and multi-currency transactions to serve global OEM and R&D customers.

Our products are trusted by major laboratories, telecom vendors, and aerospace manufacturers worldwide.