PARIS — Phasor, one of a half-dozen startups trying to bring to market small, flat-panel, electronically steered satellite antennas for mobile applications, has filed for bankruptcy in Britain. Its assets are being put up for a sale expected within weeks.

Phasor Solutions Ltd. of London held the intellectual property of the Phasor antenna and was the technology hub. Phasor Inc. of the United States, which owns 100% of the British entity, is the company’s more customer-facing arm. Its chief executive is David Helfgott, a veteran of . . .

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