Novel algorithm for designing reflect-array antennas based on analytical methods

Nasrollahi, H.; Fallah, Mahmoud; Nazeri, Amir Hossein; Abdolali, Ali

doi:10.1016/j.aeue.2018.09.016

Cited by 9 publications

(4 citation statements)

References 27 publications

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“…Here, a parallel connection of R1, L1, and C1 employs the frequency resonance, where R1 denotes the radiation resistance of the RLC tank circuit. Also, C2 and C3 constitute the capacitive coupling effect along radiating edges 46 , whereas L2 amounts to the ground inductive reactance. The corresponding values of lumped components have been obtained using the standard equations of RLC tank circuits and later optimized for desired resonance in ADS as given in Table 4 .…”

Section: Methodsmentioning

confidence: 99%

Circularly polarized differential intra-oral antenna design validation and characterization for tongue drive system

Ahlawat

Kanaujia

Rambabu

et al. 2023

Sci Rep

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Assistive devices are becoming increasingly popular for physically disabled persons suffering tetraplegia and spinal cord injuries. Intraoral tongue drive system (iTDS) is one of the most feasible and non-invasive assistive technology (AT), which utilises the transferring and inferring of user intentions through different tongue gestures. Wireless transferring is of prime importance and requires a suitable design of the intra-oral antenna. In this paper, a compact circularly polarized differential intra-oral antenna is designed, and its performance is analysed within heterogeneous multilayer mouth and head models. It works at 2.4 GHz in the Industrial, Scientific, and Medical (ISM) band. The footprint of the differential antenna prototype is 0.271 λg$$\times$$ × 0.271 λg$$\times$$ × 0.015 λg. It is achieved using two pairs of spiral segments loaded in diagonal form near the edges of the central rotated square slot and a high dielectric constant substrate. Its spiral-slotted geometry further provides the desired swirling and miniaturization at the desired frequency band for both mouth scenarios. Additionally, corner triangular slits on the radiating patch assist in tuning the axial ratio (< 3 dB) in the desired ISM band. To validate the performance of the proposed in-mouth antenna, the measurement was carried out using the minced pork and the saline solution for closed and opened mouth cases, respectively. The measured − 10 dB impedance bandwidth and peak gain values in the minced pork are from 2.28 to 2.53 GHz (10.39%) and − 18.17 dBi, respectively, and in the saline solution, are from 2.3 to 2.54 GHz (9.92%) and − 15.47 dBi, respectively. Further, the specific absorption rate (SAR) is estimated, and the data communication link is computed with and without a balun loss. This confirms that the proposed differential intraoral antenna can establish direct interfacing at the RF front end of the intraoral tongue drive system.

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Section: Methodsmentioning

confidence: 99%

Circularly polarized differential intra-oral antenna design validation and characterization for tongue drive system

Ahlawat

Kanaujia

Rambabu

et al. 2023

Sci Rep

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“…Thus, new ideas have been proposed to implement affordable beam steering antennas. In this regard, reflectarray antenna has been introduced as a hopeful technique [5][6][7]. Also, their popularity increases because of their capability of implementation with new technologies [8,9].…”

Section: Introductionmentioning

confidence: 99%

A Narrow Beam, Beam Steerable and Low Side-Lobe Reflectarray Based on Macro Electro-Mechanical Technique

Asgharian¹,

Zakeri²,

Yazdi³

2020

PIER C

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In this paper, an X-band, nonuniform and passive beam steering reflectarray antenna is presented. The beam steering is done with a small movement of a large element, i.e., the ground plane. The maximum ±7.5 • beam scanning from the antenna broadside is achieved by only ±0.05λ ground tilting. In the proposed structure, the beam steering capability is provided by using passive elements that eliminate the need for active biased circuits. The linearity of beam scanning as a function of ground tilting is also investigated. Compared to the previous similar works, the antenna's half-power beamwidth and side lobe level are improved by about 9 • and 20 dB, respectively. A primarily proposed reflectarray is fabricated to validate our claim.

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“…In [11], [12], new analytical approaches are presented based on equivalent circuits of Square and Hexagonal patches. A new approach is introduced to design FSS structures based on tuning the A Novel Fractal Multi-band Frequency Selective Surface Mahmoud Fallah 1 , Amir Hossein Nazeri *1, 2 , Mohammad Reza Azadkhah 1 277 frequency response of each layer, [13], [14]. But, one of the most attractive and desirable features of FSS structures is operating band controllability.…”

Section: Introductionmentioning

confidence: 99%

A Novel Fractal Multi-band Frequency Selective Surface

Fallah

Nazeri

Azadkhah

2019

J. Microw. Optoelectron. Electromagn. Appl.

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In this paper, a new multiband fractal frequency selective surface (MF-FSS) is proposed. The work presents a new fractal design methodology for FSSs with Swastika fractal patch elements. The proposed MF-FSS includes periodic arrays of metallic patches, printed on a single layer substrate. The structure parametric analysis is carried out in terms of fractal iterations, geometry elements, and unit-cell size. The simple controllable feature of the proposed structure lets us tune the given parameters of FSS geometry to achieve adjustable bandstop filter. The fractal geometry allows us to design compact structures (CP = 54%) that behave like dual-polarized bandstop filters. The designed structure is validated by means of an excellent agreement between the simulation and measurement results. Also, results show the proposed structure presents the most desirable features like fractal compactness, multiband response, dual polarization, excellent angular stability, and controllability. This work presents a fundamental structure that can be applied into the more complex and sophisticated designs in future.

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Novel algorithm for designing reflect-array antennas based on analytical methods

Cited by 9 publications

References 27 publications

Circularly polarized differential intra-oral antenna design validation and characterization for tongue drive system

Circularly polarized differential intra-oral antenna design validation and characterization for tongue drive system

A Narrow Beam, Beam Steerable and Low Side-Lobe Reflectarray Based on Macro Electro-Mechanical Technique

A Novel Fractal Multi-band Frequency Selective Surface

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