APC-7 Connector

The APC-7 connector (all referred to as a 7 mm connector) is a precision coaxial connector that was used on laboratory microwave test equipment for frequencies up to 18 GHz. APC-7 connectors were advantageous because they have a low-reflection coefficient, make repeatable coaxial connections, and are genderless. The connectors are expensive, so they are seldom used outside the laboratory where their cost can be justified by their accuracy and convenience. Due to their high cost, their 18 GHz frequency limitation, and new laboratory practices, the connectors are now uncommon. Modern low frequency microwave equipment often uses the less expensive 3.5 mm (26.5 GHz) connector. Higher frequency equipment must use higher performance connectors such as the 2.92 mm (40 GHz), 2.4 mm (50 GHz), or 1.0 mm (110 GHz) connectors.