This paper investigates the effect of a planar array antenna integrated with dielectric and FSS to its backward RCS and radiation pattern. The results shows that dielectric layer can optimize radiation pattern of antenna when it is integrated on the surface of antenna, while rarely influence radiation pattern when dielectric layer have some distance from antenna surface. And, dielectric layer influences the RCS of antenna very little. One-layer FSS makes radiation pattern of antenna significantly bad when it be integrated on the surface of antenna, while when it is put some distance above the surface of antenna, it's influence to radiation pattern of antenna get very little. However one-layer FSS could dramatically optimize antenna's RCS at out of band.
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