Coax Connectors Würth Elektronik Coax Connectors contain a wide range of standard SMA solutions for frequencies up to 40GHz. These SMA connectors include WR-SMA, WR-RPSMA, WR-SMB, WR-SMP, WR-ADPT, WR-CXASY, and WR-UMRF types. The WR-SMA and WR-RPSMA series are standard or reverse polarity subminiature version A connectors that include panel-mounted versions with solder cups, flat tabs, or round post connections.