N.FL Coaxial Connectors Hirose Electric N.FL Coaxial Connectors feature a low profile mating height of 1.4mm, 1.5mm maximum. These ultra-miniature, lightweight, SMT coaxial connectors offer high-frequency performance of 1.3 maximum voltage standing wave ratio (VSWR) (DC to 6GHz). Hirose Electric N.FL Coaxial Connectors are ideal for any applications requiring high-frequency transmission using small coaxial connectors.