Stellant Systems Inc. is a manufacturer of microwave devices for ground-based, airborne and satellite communications and radar.

In October 2021, Stellant systems was formed from L3Harris Technologies' Electron Devices and Narda Microwave-West divisions when both were sold to Arlington Capital Partners, a Washington D.C.–based private equity firm.

[4][5] In the early 1950s, Hughes secured a military contract for the XF-108 Rapier interceptor's AN/ASG-18 fire control system and radar.

L3 already owned another company using the initials EDD, thereby prompting a name change to L-3 communications, Electron Technologies, Inc. or ETI for short.

[6] Narda, a firm which specialized in the RF and Microwave Product industries, was formed in 1953 in Mineola, New York.

It was initially named Nassau Research & Development Associates and was made up of three engineers, Bill Bourke, Jim McFarland, Stu Casper, and a writer and businessman, John McGregor.

[11] Stellant Systems Inc. came into being when L3Harris Technologies sold the Electron Devices and Narda Microwave-West divisions to Arlington Capital Partners, a private equity firm, in early October 2021.

[12] Under this agreement, Electron Devices and Narda Microwave-West would combine to form Stellant Systems Inc. and become a subsidiary of Arlington's.