Abstract
A 5.3 GHz microstrip antenna for use in synthetic aperture radar (SAR) systems was developed with a composite sandwich construction, using composite laminates, Nomex honeycomb and aluminum alloy. This is the surface-antenna-structure (SAS) for application to load-bearing structural surfaces. The design concept originated from a composite sandwich structure and a multi-layer microstrip antenna. Design, fabrication and validation of structural/electrical performances were all demonstrated. To verify the structural rigidity, flexural behavior was observed under the three-point bending test and was compared with two kinds of composite sandwich beams consisting of CFRP–GFRP skins and Nomex honeycomb core. Electrical measurements of the fabricated antenna array were in good agreement with design requirements, and a comparative study found that SAS has good mechanical characteristics. The SAS concept can be extended to give a useful guide to manufacturers of structural body panels as well as antenna designers, promising innovative future communication technology.
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