.047 diameter Semi-Rigid cable is often used as an interconnect without connectors.

The exposed center conductor and outer jacket are soldered directly to the circuits being connected.

Several subminiature connectors also mate well with this diameter and are used where space is at a premium and high loss can be tolerated.

Electrical Specifications
Frequency (GHz)   110
Max. Power (Watts @ 1 GHz)    32
Operating Temperature   -55 to +150C 
 
Material
Diameter    0.047
Min Bend Radius (in.)   0.050