RF coaxial connector adapters are used to transmit RF signals over a wide frequency range, reaching 50 GHz and higher. They are primarily used in radar, communications, data transmission, and aerospace equipment.
The basic structure of a coaxial adapter consists of a center conductor, a dielectric material (also called an insulator), and an outer conductor (which acts like the outer shield of a coaxial cable).
Coaxial adapters are mainly categorized into: 1.0mm, 1.85mm, 2.4mm, 2.92mm, 3.5mm, SSMA, SMA, SSMP, SMP, N, TNC, and TNCA. Basic terms for describing an adapter:
1: Connector type-e.g., SMA, 3.5mm, N-type
2: Contact type-male (J/M), female (K, F)
3: Characteristic impedance-Connector impedance is generally categorized as 50Ω or 75Ω.
When requesting an adapter, as long as these three basic requirements are met, you'll know what you need:
Need an N/3.5-JK adapter:
Describe it this way: Need a 50Ω impedance adapter with a N-type male connector on one end and a 3.5mm female connector on the other end-no problem.
Different price points generally indicate different grades of adapters.
We generally assume that price equates to higher quality, but this isn't a complete evaluation criterion. There are three grades of adapters, each representing a common application requirement.
Metrology Grade: Of all connector grades, metrology grade offers the highest performance but also the highest cost.
Primarily used for calibration standards, performance verification standards, and applications requiring precision connections.
Features: High performance, slotless connection design, tight tolerances, and long life, but also high production costs.
This grade of connector offers the most precise dimensions and tightest tolerances, allowing it to withstand repeated connection cycles, resulting in the longest lifespan of all grades.
Instrument-grade connectors are generally considered "intermediate-grade" connectors.
They are primarily used for instrument input and output interfaces and some economical calibration components.
Features: High performance, tight tolerances, and support for non-conductive interfaces, resulting in a relatively long lifespan.
They offer better test performance and tighter tolerances. Compared to metrology-grade adapters, some instrument-grade adapters may not perfectly match metrology-grade connectors, as they may use interfaces for non-conductive media.
Production-grade adapters are generally used on test products. Due to their wider tolerances, the performance of connectors in this grade is lower than the previous two types.