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Optical-beam-former-for-high-frequency-antenna-arrays

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Details

Inventors: Lee, Jar J.; Yen, Huan-Wun;
Assignee: Hughes Aircraft Company (Los Angeles, CA)
Primary Examiner: Blum; Theodore M.
Assistant Examiner:
Attorney, Agent or Firm: Duraiswamy; V. D., Coble; P. M., Denson-Low; W. K.

A wideband, true time delay antenna beamforming network 10 for millimeter wave phased array antennas is disclosed herein. The beamforming network 10 of the present invention includes a laser 30 for generating a beam B of electromagnetic energy. The beamforming network 10 further includes an electro-optic modulator 40 for modulating the beam B in response to an input signal S modulated about a first frequency f.sub.o. A first antenna array 80 generates a first electromagnetic field pattern P by radiating the modulated beam B' in a first direction. The present invention further includes a constrained lens 90 for receiving the first field pattern P and for emitting an antenna driver feed beam F in a second direction in response thereto. An antenna array driver 115 electro-magnetically coupled to the constrained lens 90 by the feed beam F provides a set of signals modulated about the first frequency f.sub.o to drive an antenna array 20.

DETAILED DESCRIPTION The need in the art for a wideband, true time delay beamforming network for millimeter wave phased array antennas is addressed by the antenna beamforming network of the present invention.
The beamforming network of the present invention includes a laser for generating a beam of electromagnetic energy.
The beamforming network further includes a modulator for modulating the beam in response to an input signal.
A first antenna generates a first electromagnetic field pattern by radiating the modulated beam in a first direction.
The present invention further includes a constrained lens for receiving the first field pattern and for emitting an antenna driver feed beam in a second direction in response thereto.
An antenna array driver electromagnetically coupled to the constrained lens by the feed beam provides a set of signals modulated about the first frequency to drive an antenna array.

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