Izixhumi ze-SMB(sub-miniature version B) zakhiwa ngeminyaka yawo-1960s.Zincane kunezixhumi ze-SMA, zifaka ukuhlangana okuzenzekelayo futhi zitholakala ngezinguqulo ezingu-50 nezingu-75 Ohm.Zenzelwe izinhlelo zokusebenza ezisebenza ku-4 GHz.Uchungechunge lwe-SMB lunesikhungo esigcwele igolide nokuxhumana kwangaphandle futhi lufanele izicelo kuzo zonke izimboni.