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System aspects and transmission impairments of active phased arrays for satellite communications

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3 Author(s)
Amir I. Zaghloul ; Dept. of Electr. & Comput. Eng., Virginia Polytech. Inst. & State Univ. ; Ozlem Kilic ; Eric C. Kohls

The communications link and system aspects of active phased arrays that are used in multiple-beam satellite systems are assessed through measurements and analysis. Three link parameters are investigated and their effects on the overall carrier-to-interference ratio (CIR) are quantified. The first parameter is the intermodulation components that are generated at the nonlinear amplifier outputs and contribute to well-formed interference in the far-field radiation of the array. The second is the bit-error ratio (BER) degradation due to the multi-carrier operation of the active array. Measurement results are shown to demonstrate this effect. The third link parameter is the cochannel interference caused by frequency reuse in multiple-beam systems. The paper starts by reviewing early developments of phased arrays for multiple-beam satellite communications applications. A key component in these developments is the modular monolithic microwave integrated circuit (MMIC) beam-forming matrices that generate a number of simultaneous and independently digitally controlled beams

Published in:

IEEE Transactions on Aerospace and Electronic Systems  (Volume:43 ,  Issue: 1 )