Maximum Operating Frequency
SMP series are a high frequency push-on connector with its interfacing system featuring an inner female-to-female component, called a bullet or blindmate, and two outer panel, circuit or cable-mounted receptacles called shrouds. The design of the SMP bullet and shroud system allows for both axial and radial misalignment. SMP connector design is standardised by MIL-STD-348B, and can operate up to 40 GHz through select manufacturers.
In blind-mate applications, one shroud connector will be typically specified as a snap-on interface and the other as a slide-on. This ensures that the bullet adapter remains fixed in the same shroud connector when the connection is disengaged.
The two snap-on interfaces Full Detent (FD) and Limited Detent (LD) each have different engage and disengage coupling forces. The LD is typically selected as the snap-on interface in PCB mount or blind-mate applications, while the FD is mainly used for cabled connections where higher retention forces are required.
The two slide-on interfaces Smooth Bore (SB) and Catcher’s Mitt (CM) allow for reduced connection forces as compared to the snap-on versions. The push-on interface creates a sliding connection that does not physically locate the mating reference planes, allowing for axial and radial misalignment. Both the SB and CM have the same engage/disengage forces; however the CM is typically specified as the shroud configuration in blind-mate applications as its generous lead-in chamfer helps capture and guide the bullet into place.
Originally marketed by the Gilbert company (now Corning Gilbert) during the 1980's under the trade name GPO, which signifies "Gilbert push-on". Subsequent versions of the connector include GPPO, G3PO, and G4PO, all of which are trademarks belonging to Corning.
SMP connectors are a popular choice for board-to-board applications, and typically found in microwave-band military and high grade commercial systems such as in phased arrays, airborne radar, active antennas, satellites, and a range of other radar systems.
A miniaturised variation capable of operating at higher frequencies is standardised under the Mini-SMP (SMPM) RF connector series.
|Male Dimensions||Female Dimensions|
|Code||SB Min (mm)||SB Max (mm)||LD Min (mm)||LD Max (mm)||FD Min (mm)||FD Max (mm)||Code||Min (mm)||Max (mm)|
|D Ø||-||-||3.15||3.20||3.15||3.20||D||0.00 nom.|