A co-planar surface-mount circulator from Renaissance Electronics Corporation is designed to operate from 4.2 GHz to 4.4 GHz. This model, designated 3SMH6NA. is the first in the 3SMHXXX series targeting this avionics frequency band. This band is also known as the radio altimeter and radar altimeter band.

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This device features a robust mechanical design to sustain aircraft shock and vibration. It also provides low EMI/EMC characteristics. Packaged in a 0.630 in. x 0.630 in. x 0.190 in. steel housing, the device is temperature stable from -40 ºC to + 85 ºC.