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A 2.92mm (K) Connectors are RF/Microwave coaxial connectors with a mode-free operating range of 40 GHz. SMA and 3.5mm connectors are compatible with these connectors. Mario Maury first created the 2.92mm connectors in 1974, and Wiltron reintroduced them in 1984 as the K connector. These connectors are IEC 61169-35 specified and are perfect for high-frequency module and T&M applications. The 2.92mm Series c has a frequency range of 40 GHz.

A The 3.5 mm connector is a heavy-duty coaxial connector that can operate at up to 34 GHz without mode switching. The air dielectric filled interface of this pin and socket type connector features a 3.5 mm outside conductor diameter. This connector interface works with SMA and 2.92mm connectors and can withstand several mating cycles without causing harm. Hewlett Packard invented the 3.5 mm connector in the mid-1970s, and Amphenol later marketed it as APC3.5.

A MMCX connectors are coaxial RF connectors that are similar to MCX but are smaller. They comply with the European CECC 22000 standard. MMCX connectors have a 500-cycle pairing rating. The connectors normally include a lock-snap mechanism that allows 360-degree rotation and a 50 ohm impedance. They can operate in a wide range of frequencies, from DC to 6 GHz. MMCX connectors can be found on Wi-Fi PCMCIA cards as antenna connectors, as well as connectors for external GPS antennas on tiny devices such as PDAs or GPS receivers, and on mobile phones to connect external GSM antennas. Different brands of in-ear monitors utilize them to connect the wire to the separate earpieces. This enables the cables to be switched or replaced. In the 1990s, they were created.

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A SMA connectors are semi-precision coaxial RF connectors with a screw-type coupling mechanism that were created in the 1960s as a minimum connector interface for coaxial cable. The impedance of the connector is 50. SMA was initially intended for usage from DC (0 Hz) to 12 GHz, but it has now been expanded to include variations for 18 GHz and 26.5 GHz. Microwave systems, hand-held radio and mobile telephone antennas, and, more recently, WiFi antenna systems all employ the SMA connector.

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