A novel neural-based approach for design of microstrip filters

Jamshidi, Mohammad; Lalbakhsh, Ali; Mohamadzade, Bahare; Mousavi, Seyed Mohammad Hadi

doi:10.1016/j.aeue.2019.152847

Cited by 64 publications

(38 citation statements)

References 25 publications

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“…The mutual coupling of the antenna was reduced by around 11 dB, while the gain was increased by 0.5 dB, because of the metasurface introduction. In a different approach, artificial intelligence has recently been used in conjunction with electromagnetic simulators to solve some of EM problems including mutual coupling through an evolutionary approach [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Mutual Coupling Reduction in Microstrip Array Antenna by Employing Cut Side Patches and Ebg Structures

Mohamadzade¹,

Lalbakhsh²,

Simorangkir³

et al. 2020

PIER M

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This paper presents the simultaneous application of Minkowski fractal geometry and EBG structures for mutual coupling reduction in microstrip array antennas for the first time. In this approach, a modified version of Minkowski fractal geometry is applied on the patch elements, and at the same time 1D electromagnetic bandgap (EBG) structures, composed of 4 EBG elements, are placed between the array elements in a very close distance. Unlike many other coupling reduction methods, which have at least one of the issues of gain reduction or complex fabrication, the proposed method does need any via or double-sided etching and slightly increases the gain of the antenna, while an excellent reduction level of 22.7 dB has been achieved. To verify the concept, 2 array antennas with the spacing of λ 0 and λ 0 /3 were fabricated and tested, showing very good agreement between predicted and measured results.

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Section: Introductionmentioning

confidence: 99%

Mutual Coupling Reduction in Microstrip Array Antenna by Employing Cut Side Patches and Ebg Structures

Mohamadzade¹,

Lalbakhsh²,

Simorangkir³

et al. 2020

PIER M

Self Cite

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“…LPFs play a key role in wireless communication systems owing to their tasks in eliminating unwanted harmonics and noise 3 . Growing demands for these elements motivate scientists to design LPFs with diverse structures and specifications 4‐19 . C‐shaped structures along with complementary split‐ring resonators were used to design an LPF 4 .…”

Section: Introductionmentioning

confidence: 99%

“…Using U‐shape Stepped Impedance and open‐ended coupled lines, a tunable LPF was proposed, 16 although its transition band is gradual. Besides, other methods such as defected ground structures, 17 circular sectors, 18 and neural‐based approaches 19 have recently been published. It should be noted that in Reference 19, an LPF, which is made up of open stubs and stepped impedance resonators, is firstly designed for which an artificial neural network is trained to enhance the specifications of the LPF, for instance in terms of sharpness.…”

Section: Introductionmentioning

confidence: 99%

“…Besides, other methods such as defected ground structures, 17 circular sectors, 18 and neural‐based approaches 19 have recently been published. It should be noted that in Reference 19, an LPF, which is made up of open stubs and stepped impedance resonators, is firstly designed for which an artificial neural network is trained to enhance the specifications of the LPF, for instance in terms of sharpness. In another study, 20 using U‐shaped resonators and transfer function analysis, a high sharp LPF was reported, although having high VSWR can be considered as a negative point of this circuit.…”

Section: Introductionmentioning

confidence: 99%

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New design of an adjustable compact microstrip lowpass filter using Z‐shaped resonators with low VSWR

Pahlavani

Moradkhani

Sayadi

2020

Micro & Optical Tech Letters

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In this article, an adjustable microstrip lowpass filter(LPF) with the cut‐off frequency (fc) at 1.59 GHz is designed and fabricated. The proposed structure is composed of a Z‐shaped resonator as basic resonator and a combination of modified T‐shaped and Z‐shaped resonators as suppressor units. To describe a theoretical design, the L‐C equivalent circuit of the basic resonator and also its transfer function are calculated precisely; then, the location of the first transmission zero (TZ) is accurately computed. Generating a deep TZ near the cutoff frequency leads to a high roll‐off rate of 195 dB/GH. The LPF also benefits from an extremely wide stopband from 1.72 to 23.67 GHz (15 fc). In passband region, the insertion loss and return loss of the LPF are 0.62 and 22.9 dB, respectively. The experimental results also show that maximum variation of group delay is only 0.53 ns regarding a negligible figure. The electrical size of the LPF is 0.187 × 0.083 λg2 (where λg is the guided wavelength at 1.59 GHz). Finally, the proposed LPF achieves a high figure of merit of 57 860 deemed a great accomplishment.

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“…PSO is recently applied in various types of array antennas for broadband, reconfigurable and switched-beam applications [6][7][8][9] and used in conjunction with CST MWS to design near-field correcting structures and spatial phase shifters [10,11]. Also this data-driven optimization is implemented to design various types of EM or microwave devices such as couplers, frequency selective surfaces, artificial magnetic conductors, aperture distribution, and filters [12][13][14][15][16][17]. However, it is not easy to find that the data-driven optimization is used to design large-scale array antennas.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Wide-Band and Wide Angle Cavity-Backed Microstrip Patch Array Using Genetic Algorithm

Kim¹,

Han²,

Kim³

et al. 2020

PIER M

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This paper specifies optimization of a low active reflection coefficient (ARC) array element with a cavity-backed microstrip patch (CBMP) using a genetic algorithm (GA) at wide-band and 2-dimensional (2D) wide angle. Both the GA implemented with a user-defined MATLAB code and a 3-dimensional (3D) full-wave electromagnetic simulator CST MWS are simulated with a real-time direct link. An optimization method using not a traditional unit cell or a small array but a 15 × 15 finite array structure is proposed to apply to a large-scale array antenna. The CBMP array antenna to meet a design goal of a max ARC is optimally designed at equally divided 9 frequencies and 11374 beam angles for S-band 400 MHz operating frequency bandwidth and beam scan coverage (Az = −60 • ∼ +60 • , El = −3 • ∼ +90 •). Measurement results show that a prototype and a full-scale array antenna have low ARC below −8.1 dB and −6.9 dB, respectively for required wide frequency bandwidth and beam scan coverage. It is confirmed that the proposed method is a good solution for optimizing a large-scale array antenna.

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A novel neural-based approach for design of microstrip filters

Cited by 64 publications

References 25 publications

Mutual Coupling Reduction in Microstrip Array Antenna by Employing Cut Side Patches and Ebg Structures

Mutual Coupling Reduction in Microstrip Array Antenna by Employing Cut Side Patches and Ebg Structures

New design of an adjustable compact microstrip lowpass filter using Z‐shaped resonators with low VSWR

Optimization of Wide-Band and Wide Angle Cavity-Backed Microstrip Patch Array Using Genetic Algorithm

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