NASA Technical Reports Server (NTRS) : Advances pdf

NASA Technical Reports Server (NTRS) : Advances

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Though there are a few examples of scanning phased array antennas that have flown successfully in space, the quest for low-cost, high-efficiency, large aperture microwave phased arrays continues. Fixed and mobile applications that may be part of a heterogeneous exploration communication architecture will benefit from the agile (rapid) beam steering and graceful degradation afforded by phased array antennas. The reflectarray promises greater efficiency and economy compared to directly-radiating varieties. Implementing a practical scanning version has proven elusive. The ferroelectric reflectarray, under development and described herein, involves phase shifters based on coupled microstrip patterned on Ba(x)Sr(1-x)TiO3 films, that were laser ablated onto LaAlO3 substrates. These devices outperform their semiconductor counterparts from X- through and K-band frequencies. There are special issues associated with the implementation of a scanning reflectarray antenna, especially one realized with thin film ferroelectric phase shifters. This paper will discuss these issues which include: relevance of phase shifter loss; modulo 2(pi) effects and phase shifter transient effects on bit error rate; scattering from the ground plane; presentation of a novel hybrid ferroelectric-semiconductor phase shifter; and the effect of mild radiation exposure on phase shifter performance

• Creator/s: NASA Technical Reports Server (NTRS
• Date: 9/1/2007
• Year: 2007
• Book Topics/Themes: NASA Technical Reports Server (NTRS), ANTENNA ARRAYS, FERROELECTRICITY, LOW COST, PHASED ARRAYS, BEAM STEERING, SPACE COMMUNICATION, SEMICONDUCTORS (MATERIALS), RADIATION DOSAGE, RADIATION EFFECTS, Romanofsky, Robert R

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