The type N series coaxial connectors were originally designed as medium-size, low voltage, constant impedance 50 OHM connectors. United Microwave Products has extended the upper operating frequency to 18.0 GHz as compared to 11 GHz offered in MIL-C-39012 pageA(pageB

N Connectors to Semi-Rigid Cable 
N Connectors to Flexible Cable 
N Panel Mount Receptacles 
N Panel Mount Receptacles TNC Flange 
N Panel Mount Type Female Bulkhead Feedthrough Connectors