Abstract
A cross-slotted linear array antenna of four stacked patches is proposed for X-band synthetic aperture radar (SAR) on a small satellite platform. Owing to the reliability, small size and mass restriction features of small satellites, the antenna is based on a thin dual-substrate topology with each element surrounded by metal vias to form a cavity-backed patch to result in a lightweight and high efficiency. Although inherently narrowband due to the thin substrate layer, cross-slotted patches were proposed to yield a dual resonance, and lower input impedance at the desired band to meet the SAR requirement. The fabricated prototype exhibits a peak gain of 12 dBi with a radiation efficiency of 84% at 9.44-9.87 GHz for |S <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</sub> | <; -10 dB.
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