Crossover: A Digitally Beamformed Feed That Serves Comms and Direction-Finding At Once

Some antenna patents refuse to stay in one lane. US12278433B2, granted to BlueHalo, LLC on April 15, 2025, is one: a "system and method for a digitally beamformed phased array feed" whose CPC reads like two different sectors at once.

Look at the classification spread. On the comms side: H04B 7/0617, 7/0639, 7/0695, 7/086 (transmit and receive beamforming) and H01Q array codes (3/2605, 3/2658, 21/062). On the defense side: G01S 3/043, 3/046, 3/38, 3/40, 3/42 — the radio direction-finding family, for locating the bearing of a signal source. The same digitally beamformed feed is being claimed for both moving data and finding emitters.

The mechanism is digital beamforming at the feed. By digitizing each element's signal early and forming beams in software, the array gains extreme flexibility: it can form communication beams, or it can scan and compare phase across elements to determine where an incoming signal is coming from. Direction-finding and communications are, at the signal-processing level, two applications of the same phased-array math — which is precisely why a single feed architecture can serve both.

This is the crossover that defines the space-and-defense boundary. A digitally beamformed array that can talk and listen-and-locate is exactly what blurs the line between a communications payload and a signals-intelligence one. BlueHalo, a defense-focused firm, patenting the dual-use feed is a clean illustration of how comms and SIGINT share a hardware lineage.

A security-aware note this desk always makes: the public patent shows the dual-use architecture; the specific direction-finding and electronic-warfare applications that matter most are typically classified and absent from the record. This grant protects BlueHalo's specific digitally beamformed feed system, not digital beamforming or direction-finding in general. Its value here is as a visible seam — proof in the public record that the same phased-array technology powering commercial satellite comms also underwrites the defense world's ability to find and characterize signals.