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برق و الکترونیک::
حلقه شش وجهی
, circular, square, hexagonal loops), Group-3 (solid interiors or patch shapes of different shapes), and Group-4 (combinations of above all).
Simple circular loops, square loops to advance loaded elements with three or four legs have been utilized; especially hexagonal loop structures are useful for wideband applications.
It is found that an ample range of bandwidth can be achieved by changing the shape of these loop elements i-e loaded three or four-legged elements, which are narrow band, whereas hexagon loops are ultra wideband.
[143] Lightweight, ultra-broadband, wide incidence angle resistive FSS absorber based on topology optimization Resistive patches on top, middle Polyurethane foam substrate & metal ground on bottom [144] Ultra-thin absorber with cascaded high impedance & FSS Pixelized metallic surface placed above the high impedance surface [145] Polarization dependent FSS absorber with multiple absorption peaks C shaped slot in a circular patch, ground bottom and polyimide film as dielectric substrate [146] FSS absorber with low profile Capacitive patches and inductive mesh [147] Compact broadband FSS absorber Resistively loaded quadruple hexagonal loops [148] Ultra compact partly transmissible absorptive FSS at 5-GHz Wi-Fi band, to solve EMI/RFI problems in mixed-signal systems.
Category Factor Impact/Outcomes Type of array element Slot element Passband Patch element Stopband Large Loop element High BW Hexagonal Loop Wide band Loaded 3 or 4 Legged element Narrow band Meandered/Convoluted element Unit cell size reduction but manufacturing limitation may occur Fractals patch Reduces the electrical length, Inter-element spacing (IES) & so resonant frequency Self similar feature of fractal Multiband response but drawback of early appearance of grating lobes Dissimilar fractal geometric patterns in single FSS Double/Multiband response Tunable FSS (Active element based) Tunability in polarization and resonant frequency Active element in AFSS Deviation in operating frequency, power management issues, high insertion losses and erroneous response Array profile Reduce the IES of gangbuster Large BW and delay in onset of grating lobes Reduce the Unit cell (small electrical dimensions) High angular stability Increase in periodicity BW and resonant frequency reduces, higher distortion and early onset of grating lobes Electrically subwavelength array separation at resonant frequency Elimination of unwanted interference Nulls Decrease of IES Stable resonant frequency, delayed onset of grating lobes IES variation BW change Circumference of element change Effect on electrical length & so resonant frequency Structure profile Cascaded surfaces Faster roll-off Multilayer FSS (stacking structure) Increase in BW AFA configuration Higher selectivity and BW 3D FSS Complex structures but faster roll-off, stable response (In- and out-band) Air gap separation BW variation Dielectric profile No dielectric substrate Unstable BW of transmission curves
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