## 1 Introduction  
Rapid developments in wireless communication technology have introduced many intelligent devices and communication systems, revolutionizing human life. These radiating devices and communication systems operating in closely spaced frequency bands generate electromagnetic interference. This might cause potential human health hazards and the malfunction or performance failure of other devices, electronic components, and RF systems working nearby. To address this problem, conductive sheets, absorbing surfaces, wire mesh, and metal screens are generally employed; however, they might block all transmissions and be bulky. On the other hand, frequency-selective surfaces (FSSs) are immune to such shortcomings and suitable, where selective shielding is required because of their small size, low cost, stable frequency responses, ease of fabrication, and employability. FSSs are the periodic arrangement of metallic resonant elements in two or three dimensions that can allow/shield/absorb electromagnetic waves and find widespread employability, including, but not limited to, radomes [1], EM absorbers [2; 3; 4], polarizers [5], antenna gain enhancement [6], RF energy harvesting [7], satellite communication [8], electromagnetic interference mitigation [9; 10], and many others. Several single-layer FSS structures have been studied for various suppression applications recently. In [11], a flexible FSS realized on textile and film substrates using a screen-printed technique is studied to see the effect of the texture printed on each substrate on its shielding characteristics. An FSS shield [12] with an ultrawideband (1.70-15.4 GHz) response is presented. However, it has the drawback of blocking out all communications over a wide range. In [13], a fractal crossed dipole structure is introduced for GSM shielding. This flexible, optically transparent dual-band FSS finds employability in building windows. A miniaturized bandstop FSS realized on a glass substrate in [14] blocks Wi-Fiand WLAN frequencies and can be used for indoor security purposes. However, it exhibits a limited angular sensitivity up to only 45\({}^{\circ}\). In [15], a pair of interdigitated hexapoles and intermediate tripoles is used to prevent transmission at 2.14 GHz and 5.13 GHz, but significant frequency shifts are observed at the upper stopband for the TM mode up to 45\({}^{\circ}\). An aperture-coupled frequency and polarization selective surface in [16] is reported for dual passband filtering applications. Further, a square loop and a bow-type ring-based center symmetric FSS [17] achieve reflection characteristics in the C-band (4-8 GHz) and X-band (8-12 GHz), with good angular and polarization stabilities. In another study [18], a T-type SRR is placed inside a rectangular SRR to function in the X- and Ku-bands (12-18 GHz) to filter out the unwanted frequencies. However, this FSS illustrates limited polarization and an angular stability up to 45\({}^{\circ}\). An FSS based on vertical and horizontal dipoles with two folded arms shields satellite downlink frequencies [19]. The FSS exhibits a highly stable and polarization-insensitive dual-band (C- and X-bands) frequency response. In [20], a dual-band-notched FSS based on four symmetrically connected square split-ring resonators at the center is reported. It effectively rejects WiMAX and X-band signals, and a passband lies between the two rejection bands. This study presents a novel low-profile dual-band shield for EMI shielding applications. The FSS unit cell is miniaturized and consists of a modified Jerusalem crossed loop (MJCL) and a corner-modified square loop (CMSL) arranged on a single-layered dielectric. It simultaneously mitigates EMI in the X-band uplink and Ku-band downlink frequencies. It preserves a good angular stability up to \(\pm\)75\({}^{\circ}\) and exhibits a polarization-independent response. The FSS shield is designed and analyzed using a commercially available 3D EM simulator (Ansys HFSS). An ECM is also presented to describe the resonance mechanism.