Fiber optic signal distribution for phased array antennas

Physics – Optics

Scientific paper

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Antenna Arrays, Antenna Design, Fiber Optics, Phased Arrays, Satellite Antennas, Satellite Communication, Satellite Transmission, Extremely High Frequencies, Integrated Circuits, Performance Prediction, Photonics, Relay Satellites

Scientific paper

The use of a 32-GHz phased-array transmitting antenna with fiberoptic signal distribution is considered in the context of a Mars relay satellite for NASA's Space Exploration Initiative. The specifications of the proposed application are assessed with specific attention given to the EIRP requirement of 86 dBW and its ramifications on the phased array, antenna, and photonic architecture. A photonic performance analysis is conducted to study phase-noise and SNR degradations to determine whether phase-locked loop (PLL) complexity is required. SNR and phase noise are examined as a function of the number of optical splits, and the number is shown to be limited to 350. Use of the PLL allows one laser to support 650 elements - as opposed to 250 - showing that only a single laser diode is needed to support the array for the Mars transmitter.

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