In this paper, a novel polarization-insensitive frequency-selective surface-based electromagnetic shield is presented for EMI shielding applications. The FSS unit cell consists of a modified Jerusalem crossed loop designed over a low-loss substrate. It achieves an effective shielding at 10 GHz frequency in the X-band. Moreover, it manifests a fractional bandwidth of 24%. In addition, the FSS offers angularly stable response up to 60 degrees for both TE and TM polarizations due to its symmetrical structure. The overall unit cell dimensions are 5.25 x 5.25 mm², Thus, the proposed design is a promising candidate for narrowband SATCOM applications.