Efficient Procedures for the Optimization of Frequency Selective Surfaces

Fallahi, Arya; Mishrikey, Matthew; Hafner, Christian; Vahldieck, R.

doi:10.1109/tap.2008.922678

Cited by 42 publications

(21 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As described in detail in Ref. [8], the following function extracts the frequencies in which the reflection coefficient of the surface is more than −15 dB and assumes zero for the other ones, then calculates their average,…”

Section: Optimization Of Radar Absorbersmentioning

confidence: 99%

“…20 log 10 R TMi + 15 + 20 log 10 R TMi + 15 /2 (8) where N is the number of incidence angles and R TEi and R TMi are the magnitude of the reflection coefficient for the i-th incidence angle and TE and TM polarizations, respectively. For the optimization of angular stability the fitness function is defined as the average of the above values.…”

Section: Optimization Of Radar Absorbersmentioning

confidence: 99%

“…The definition of the optimization problem for a radar absorber with a periodic substrate is the topic of Section 3. In a previous paper, 8 it was shown that in the case of homogeneous substrates an advanced micro-genetic algorithm (MGA2) and a randomly initialized hill-climbing (RHC) algorithm are the best ones to obtain the global maxima with a high probability. Since the same study was not possible for radar absorbers with periodic substrates, we simply generalized the result for our case and applied the mentioned algorithms to find optimum structures behaving as radar absorbers.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Radar Absorbers Based on Frequency Selective Surfaces on Perforated Substrates

Fallahi¹,

Mishrikey²,

Hafner³

et al. 2008

Jnl of Comp & Theo Nano

Self Cite

View full text Add to dashboard Cite

A new type of metamaterials is introduced which can be fabricated by printing metal patches on inhomogeneous, periodic substrates. Such structures without periodic substrate are known as Frequency Selective Surfaces (FSS) but they are more promising for EMC shielding than common FSS structures because both the effective dielectric permittivity and loss of the substrate can be controlled. A numerical method based on the combination of Rigorous Coupled Wave Analysis (RCWA) and Method of Moments (MoM) is applied for the analysis of plane-wave incidence. Using both an advanced micro-genetic algorithm and a randomly initialized hill-climbing algorithm, the introduced structures as well as the conventional frequency selective surfaces with homogeneous substrates are optimized to be used as radar absorbing surfaces. The results show that better performance might be obtained when textured substrates are applied.

show abstract

Section: Optimization Of Radar Absorbersmentioning

confidence: 99%

Section: Optimization Of Radar Absorbersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Radar Absorbers Based on Frequency Selective Surfaces on Perforated Substrates

Fallahi¹,

Mishrikey²,

Hafner³

et al. 2008

Jnl of Comp & Theo Nano

Self Cite

View full text Add to dashboard Cite

show abstract

“…In addition, since wave propagation analysis is required for the structural optimization of MMI couplers, large population sizes increase the computational time. To overcome such drawbacks of the SGA, a real-coded GA [18], in which the chromosome is represented by a vector of floating point numbers, and a micro-GA (µGA) [19][20][21][22][23], in which the population size is typically five, have been proposed.…”

Section: Introductionmentioning

confidence: 99%

Structural Optimization of Silica-Based 2 X 2 Multimode Interference Coupler Using a Real-Coded Micro-Genetic Algorithm

Yasui¹,

Sugisaka²,

Hirayama³

2017

PIER M

View full text Add to dashboard Cite

Abstract-We propose a structural optimization method based on a real-coded micro-genetic algorithm to realize a weakly guided 2 × 2 multimode interference (MMI) coupler with low imbalance and excess loss over a wavelength range from 1520 to 1580 nm. The proposed method was applied to silica-based 2 × 2 MMI couplers with a relative refractive index difference of 5.5%. The optimized result showed an imbalance of less than 8.4 × 10 −3 dB, an excess loss of less than 0.14 dB, and a normalized output power of more than 48% over the operation wavelength range. The proposed method achieved an optimized 2 × 2 MMI coupler after 250 times of propagation analysis per wavelength, which is less than 6.7% of those by the conventional methods for 4×4 and 1×4 MMI couplers, and was proven to be more effective than the conventional methods. To consider realistic optical devices, 2 × 2 MMI couplers whose values of structural parameters are close to the optimized values within the accuracy of typical fabrication tolerance are also analyzed. The results are comparable to those of the optimized 2 × 2 MMI coupler.

show abstract

“…Various schemes were introduced to design FSS for specific applications [2]. In addition, some studies have been also done on the optimization of FSS [11], [14].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Frequency Selective Surfaces on Periodic Substrates Using Entire Domain Basis Functions

Yahaghi

Fallahi

Abiri

et al. 2010

IEEE Trans. Antennas Propagat.

View full text Add to dashboard Cite

The paper presents an efficient procedure to utilize the existing method of moments/boundary integral-resonant mode expansion approach for the analysis of frequency selective surfaces printed on periodic and inhomogeneous substrates. The Green's function matrix of the structure is obtained using a multiconductor transmission line model. The resulting series equations are solved by using the periodic method of moments with entire domain functions as both basis and test functions. The required entire domain functions are extracted using boundary integral-resonant mode expansion. The Fourier coefficients of the basis functions are evaluated from the coupling integrals by applying a coordinate transformation. Some examples are analyzed and compared to measurement data. To illustrate the excellent convergence of the method, a comparison between using entire domain and sub-domain functions is made. It is shown that by using the proposed approach not only the number of required basis functions reduces but also lower truncation orders in the Fourier expansions need to be considered. This leads to a drastic reduction of the computation time.Index Terms-Boundary integral resonant mode expansion, entire domain basis functions, frequency selective surfaces, method of moments, multiconductor transmission lines method, periodic structures, spectral domain analysis.

show abstract

Efficient Procedures for the Optimization of Frequency Selective Surfaces

Cited by 42 publications

References 16 publications

Radar Absorbers Based on Frequency Selective Surfaces on Perforated Substrates

Radar Absorbers Based on Frequency Selective Surfaces on Perforated Substrates

Structural Optimization of Silica-Based 2 X 2 Multimode Interference Coupler Using a Real-Coded Micro-Genetic Algorithm

Analysis of Frequency Selective Surfaces on Periodic Substrates Using Entire Domain Basis Functions

Contact Info

Product

Resources

About