Abstract
Abstract A compact, polarization insensitive, wide stop band frequency selective surface is presented. The unit cell is designed by modifying the basic square loop FSS. The simulated value of bandwidth for transmission < ‒ 20 dB for TE incident wave is 7.7 GHz from 4.71 GHz to 12.41 GHz which is 89.95% corresponding to the center frequency of this range. It has an excellent band stop response for C and X band. The periodicity of the unit cell is the order of 0.33λ0 at the center frequency of 8.56 GHz. The total thickness of the proposed structure is 1.6mm (0.045λ0). Standard design formulas are used to evaluate the resonance frequencies and calculated values are found to be very close to the simulated ones. The proposed design is polarization insensitive and has good angular stability. An array of the proposed design is fabricated on either side of dielectric substrate FR4. The measured and simulated transmission responses are in good agreement. Proposed design can be used for many potential applications such as electromagnetic shielding, spatial filtering, sub - reflector in antennas and RCS reduction etc.
Highlights
Electromagnetic band gap (EBG) structures [1], partially reflective surfaces (PRSs) [2], and artificial magnetic conductors (AMCs) [3] are extensively investigated for their variety of applications in microwave and millimeter wave regimes
AMCs and PRSs such as Frequency Selective Surfaces (FSSs) [4,5,6] are used as the ground plane to improve the aforementioned characteristics of the antenna
The conventional square loop type FSS structure is modified by cutting the slots of the size W1 × L1 symmetrically
Summary
Electromagnetic band gap (EBG) structures [1], partially reflective surfaces (PRSs) [2], and artificial magnetic conductors (AMCs) [3] are extensively investigated for their variety of applications in microwave and millimeter wave regimes. FSSs are usually designed to give frequency responses like band stop, band pass, high pass and low pass spatial filter [7] Their performance depends upon an element type, its shape, size, periodicity, polarization, incident angle and thickness of the dielectric layer [8]. Another wide stop band FSS design has been proposed in [18] It is polarization insensitive but its substrate thickness is large and its -20dB transmission bandwidth is almost nil. A compact, ultra wide band square loop FSS has been proposed in [18] It covers 8 GHz of -20db transmission bandwidth, but it lacks in rotational symmetry which makes it sensitive to incident wave polarization and its center frequency varies w.r.t different incident angles. The dimensions of W1 and L1 are critically optimized to maintain the effective width nearly constant
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