Design of waveguide filters by using genetically optimized frequency selective surfaces

A New Frequency Selective Window for Constructing Waveguide Bandpass Filters With Multiple Attenuation Poles

“…The FSS consists of thin conductor supported by a dielectric substrate, and its dual-behavior resonance is realized by the combination of the aperture-type and the patchtype FSSs. Our proposed FSS is more suitable for obtaining a sharpskirt response than previous ones [12,13]. However, the dielectric substrate of FSS-loaded waveguide filters brings the insertion loss in the passband due to dielectric loss and also makes installation and mechanical stability difficult.…”

Artificial Neural Networks and Efficient Optimization Techniques for Applications in Engineering

“…10(a). FSSs are used for a variety of applications, such as: hybrid radomes (Cruz et al, 2010), polarizers and dichroic reflectors (Munk, 2000), waveguide filters (Monorchio, 2005), artificial magnetic conductors (Genovesi et al, 2006) and microwave absorbers (Liu et al, 2004). To provide high-performance filtering properties at microwave bands, electromagnetic engineers have investigated various types of FSS devices: reconfigurable FSS screens, fractal self-similar geometries , pixelized FSS screens, multilayered FSS structures, as well as FSSs on anisotropic substrates (Silva et al, 2007;Campos et al, 2001).…”

Effect of the Metal Sheet Thickness on the Frequency Blueshift in Single Layer Composite Materials at Ka Microwave Frequency

“…For our research we adopted frequency selective surfaces in order to magnify the frequency discrepancy among the experimental measurements and the theoretical predictions referred to samples with ideal characteristics. Consequently, the use of the GA [12,13] with the MOM solver makes possible to consider a large number of arrangements for the conductive regions of the frequency selective surface. To this end transversally arranged FSSs can be analyzed by resorting to a free-space periodic MoM counterpart.…”

“…The size of the cell is determined by the minor side of the waveguide and an integer sub-multiple of this length is allowed. The determination of the proper FSS is performed by using a genetic algorithm [13]. All design parameters have been coded in a binary string to form a chromosome, representing a solution for the filter.…”

“…Such a composite material can be accommodated in the waveguide by simply screwing them on the flange. The design method was previously introduced in [12,13].…”