Controlling Gain Enhancement Using a Reconfigurable Metasurface Layer

Almizan, Hayder; Hassain, Zaid A. Abdul; Elwi, Taha A.; Al-Sabti, Saif Mohamed Baraa

doi:10.1109/atee52255.2021.9425037

Cited by 13 publications

(13 citation statements)

References 7 publications

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“…Using the proposed FSS's reflection phase ϕ R (Figure 12B), and by calculating the path delay phase (ϕ S ) at D z = 18.74 using Equation (12), we can find the total phase shift at that distance, to further validate our numerical simulation results. Since the path delay phase (ϕ S ) relied mainly in both a certain frequency f r and spacing D z , the proposed FSS structure exhibits a zero-phase reflection at 8 GHz, and its half wavelength consequently is 18.74 mm, the ϕ S equals to 2π (Figure 16).…”

Section: Fss-backed Uwb Antennamentioning

confidence: 66%

“…By introducing four PIN diodes for structure reconfiguration with ON and OFF states. The authors in Reference 12 were able to enhance the overall gain of the structure from 1 dBi to 2, 5, 8, and 11 dBi, respectively, to the four states. Another metamaterial‐based UWB antenna, was proposed in Reference 13, to harvest radio frequency (RF) energy, suited for the Internet of Things (IoT) applications.…”

Section: Introductionmentioning

confidence: 99%

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Performance enhancement of an ultra‐wideband antenna using a compact topology optimized single frequency selective surface‐layer as a reflector

Melouki

Hocini

Denidni

2022

Int J RF Mic Comp-Aid Eng

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In this article, an ultra‐wideband (UWB) topology optimized frequency selective surface (FSS) is introduced as a reflecting layer, to maximize the gain and overall performances of an UWB monopole antenna. The single Rogers RO4350B‐based FSS layer is synthesized using an automated system, based on an interface bridged between CST Microwave studio and Matlab, and optimized using a binary genetic algorithm. First, the FSS unit cell foot print needs to be as small as possible, while covering a wider frequency range, and to achieve these performances, the proposed genetic algorithm synthesizing system achieved an FSS unit cell with only 0.1 λ × 0.1 λ at the lower‐end frequency, covering a bandwidth of 2.9–14.5 GHz. Polarization independence is achieved also, due to the four‐folded symmetry imposed on the FSS unit cell. The proposed antenna is designed on a Rogers RO4350B substrate, and backed at a distance of 18.74 mm by an FSS structure. The fabricated prototype shows a bandwidth of 3.1–13.9 GHz, and an excellent maximum peak gain of 9.7 dBi, with an improvement of 3.41 dBi cross the UWB spectrum (from 3.7 to 7.11 dBi), and in good agreement with the simulation results, which made the proposed design a promising candidate for UWB applications requiring high gain, such as ground‐penetrating radar, and microwave radiology imaging (MRI) systems.

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Section: Fss-backed Uwb Antennamentioning

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Performance enhancement of an ultra‐wideband antenna using a compact topology optimized single frequency selective surface‐layer as a reflector

Melouki

Hocini

Denidni

2022

Int J RF Mic Comp-Aid Eng

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“…The synthesis of non‐uniform planar antenna array in order to achieve desired radiation characteristics has significant applications and interests in the field of advanced wireless communication 1–9 . Two types of nonuniform arrays are considered, namely, thinned array and sparse array.…”

Section: Introductionmentioning

confidence: 99%

“…considered, namely, thinned array and sparse array. In thinned antenna arrays, 3,4,7 some of the array elements are switched off to produce a targeted power pattern. 3,9,10 In sparse array antenna, the position of the array elements is strategically distributed on the array aperture area with some minimum as well as maximum spacing constraints.…”

mentioning

confidence: 99%

Meta‐heuristic optimization algorithms for placement of multiple nulls and minimization of side lobe level in quadrant symmetric sparse array antenna

Dutta

Misra

Mahanti

2022

Int J Communication

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Summary The optimization of the non‐uniform planar array antenna parameter in order to minimize the signal interference in the electromagnetic environment through null placement is one of the most important areas of investigation in the field of wireless communication. This study deals with an effective method of synthesis of a quadrant symmetric sparse planar array antenna using the novel implementation of the well‐known meta‐heuristic optimization algorithms, namely, symbiotic organism search (SOS) and moth flame optimization (MFO) algorithms. The objective of this work is to place multiple small and wide nulls at the desired angles and simultaneously minimize the side lobe levels using a nonlinear mathematical approach. Three examples are presented with constraints that include the inter‐elemental distance, fixed number of array elements in the aperture, and the aperture size. The radiating antenna array elements are considered to have fixed uniform current distribution. The meta‐heuristic optimization approach offers the advantages of avoiding the infeasible solution while finding the best optimal set of element positions to reduce side lobe level in the desired radiation pattern. The radiation pattern characteristics and the computation time associated with each example and each algorithm are recorded and compared for arriving at the conclusion. The superiority of SOS is found in terms of the optimized side lobe levels. At the same time, both algorithms are found to be efficient in positioning the symmetric nulls in desired locations in the radiation pattern successfully. When compared with the published papers, proposed approach yields better results confirming the effectiveness of the performance of these algorithms.

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“…9 One of the applications for the reflectors is the gain enhancement of antennas, especially patch antennas which suffer from low gain at high frequencies. [10][11][12][13] Another ground breaking work is using the FSS as polarisation converters. These are easy to fabricate, mechanically robust and can be used to reduce the space occupied by the devices in microwave-terahertz frequencies.…”

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confidence: 99%

A low profileRFshieldingFSSwith enhanced ultrawide bandwidth range and angular stability

Prasad

Singh

Kumar

2022

Int J RF Mic Comp-Aid Eng

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This article describes a frequency selective surface (FSS) for shielding with an improved angular stability over a wide frequency range. The proposed unit design consists of a circular ring in a square element, two cross dipoles, and a T-type slotted structure printed of size 0.052 lambda 0 Â 0.052 lambda 0 on a layer of FR4 substrate having a thickness of 0.0075 lambda 0 .Here lambda 0 is the free-space wavelength of lower cut-off frequency. It has improved the bandwidth range from 2.84 GHz to more than 20 GHz enough to provide effective shielding against the entire ultra-wideband (UWB) range, as well as the X-and Ku-bands. Up to 75 degrees of oblique incidence, the proposed design is polarisation independent and angularly stable. The structure is full wave simulated and an equivalent circuit model is realised. The findings are validated through the use of a fabricated prototype. The applications of shielding are in reducing electromagnetic interference in civil and military applications as well as improving the gain of UWB patch antennas.

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Controlling Gain Enhancement Using a Reconfigurable Metasurface Layer

Cited by 13 publications

References 7 publications

Performance enhancement of an ultra‐wideband antenna using a compact topology optimized single frequency selective surface‐layer as a reflector

Performance enhancement of an ultra‐wideband antenna using a compact topology optimized single frequency selective surface‐layer as a reflector

Meta‐heuristic optimization algorithms for placement of multiple nulls and minimization of side lobe level in quadrant symmetric sparse array antenna

A low profileRFshieldingFSSwith enhanced ultrawide bandwidth range and angular stability

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