Inductive Frequency Selective Surface: An Application for Dichroic Sub-Reflectors

Vásquez-Peralvo, Juan Andrés; Fernández-González, José-Manuel; Valtr, Pável; Rigelsford, Jon

doi:10.1109/access.2020.2970271

Cited by 10 publications

(5 citation statements)

References 21 publications

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“…1) Using the S-parameters of a single-layer unit cell, which were previously computed by a full-wave electromagnetic simulator, calculate the admittance using (1). 2) By means of curve fitting method described in [21] and using (2), the values of equivalent capacitance and inductance are obtained.…”

Section: A Equivalent Circuit Model Analysismentioning

confidence: 99%

Interwoven Hexagonal Frequency Selective Surface: An Application for WiFi Propagation Control

Vásquez-Peralvo

Fernández-González

Rigelsford³

et al. 2021

IEEE Access

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A sub-wavelength band stop unit cell Frequency Selective Surface, comprising six continuously interwoven hexagonal unit cells and arranged as a tessellated surface, is proposed, analyzed, simulated, and measured. The broadband and sub-wavelength characteristics of this unit cell, below the typical λ 0 /2, are analyzed and discussed. It has been demonstrated that by using the unit cell proposed in this paper, a 22% increase in the fractional bandwidth can be achieved along with a substantial improvement in its angular stability at high angles of incidence, compared to similar works previously published. The analysis of this unit cell is performed using the equivalent circuit method that allows relating the number of interweaves with the equivalent capacitance and inductance, thus giving a better understanding of the unit cell characterization. In addition, a frequency selective surface arranged in a 2.5D configuration is also proposed. This 2.5D configuration provides a bandwidth similar to the conventional model but with a reduction in the resonance frequency by 44%. Simulations have been validated using two prototypes, each having an overall dimension of 400 x 400 mm. To demonstrate the scalability of the design, both prototypes are designed to be used as WiFi propagation control, working as a band stop filter at 2.4 and 5.8 GHz, respectively. Transmission coefficients have been measured for TE and TM-modes using an optical bench at angles of incidence from 0 to 60 • . These compare favorably with simulations performed using the frequency domain solver in CST Microwave Studio and are found to have a maximum MSE of 2.3 ×10 −3 .

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Section: A Equivalent Circuit Model Analysismentioning

confidence: 99%

Interwoven Hexagonal Frequency Selective Surface: An Application for WiFi Propagation Control

Vásquez-Peralvo

Fernández-González

Rigelsford³

et al. 2021

IEEE Access

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“…On the other hand, if the surface is band-stop filter, and using Foster's first form, the equivalent circuit is a series RLC [19]. Both can be used, but depending on which, the bandwidth and central frequency will be affected.…”

Section: A Frequency Selective Surface Analysismentioning

confidence: 99%

Beam Steering Using Active Artificial Magnetic Conductors: A 10-Degree Step Controlled Steering

2020

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An Active Artificial Magnetic Conductor (AAMC) is presented to steer the radiation pattern of a printed dipole working at 2 GHz. The elements that generates the phase shift are a set of Varactor Diodes, which are characterized using its spice model in order to obtain a phase shift-capacitance mapping. Overall beam steering of +/-40 • with a step size of 10 • is achieved. A circuit model that describes any multilayer substrate AAMC unit cell, which uses fist form of Foster's theorem along with transmission line theory, is proposed. Our work is suitable to be used as low profile antenna; for example, street furniture antennas, which are located on the facades of houses or buildings, so that they can be visually mixed up with signs or advertisements. Simulations have been validated using a prototype consisting of an array of 22x14 AAMC elements; the overall structure measures 1.9λ 0 x1.21λ 0. This reflector will generate a phase gradient in its columns, which will modify the reflection angle of an incident electromagnetic wave in the H-Plane. Beam switching control has been achieved using suitably amplified LPF PWM signals generated by two Arduino modules. A printed dipole with a Fractional Bandwidth of 17% is designed and manufactured to illuminate the structure at a distance λ 0 /4 above the surface. Far-field radiation patterns and reflection coefficients have been measured in an anechoic chamber using a spherical system. These compare favorably with simulations performed using the Time Domain solver in CST Microwave Studio.

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“…Frequency selective surfaces (FSSs) are periodic array structures that exhibit reflection or transmission characteristic [1]. FSSs have been widely used in many electromagnetic applications such as radomes [2,3,4], microwave absorbers [5,6,7], antenna reflectors [8,9,10], and electromagnetic shielding [11,12,13]. With the rapid development of multi-frequency communications, FSSs with multiple independent frequency bands are usually used to increase the channel capacity of the communications system and improve work efficiency.…”

Section: Introductionmentioning

confidence: 99%

A new miniaturized dual-band FSS with second-order response and independent operating bands

Fan

Yuan

Zhang

et al. 2023

IEICE Electron. Express

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In this letter, a new miniaturized dual-band frequency selective surface (FSS) with second-order frequency responses at each band is presented. The proposed structure is designed by cascading three metallic layers that are separated by two thin dielectric substrates. The proposed FSS composed of resonant and non-resonant elements implements two independently controllable pass-bands performance. An equivalent circuit model of the structure is provided to demonstrate the filtering mechanism. The proposed FSS provides stable filtering characteristics and sharp roll-off characteristics centered at Xand Ku-band, respectively. In addition, the proposed FSS exhibits highly stable frequency responses for EM waves of different polarizations and incident angles. A prototype of the FSS was fabricated and measured, the measured results have a good agreement with the simulated ones, which verifies the excellent performance of the proposed new dual-band FSS.

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Inductive Frequency Selective Surface: An Application for Dichroic Sub-Reflectors

Cited by 10 publications

References 21 publications

Interwoven Hexagonal Frequency Selective Surface: An Application for WiFi Propagation Control

Interwoven Hexagonal Frequency Selective Surface: An Application for WiFi Propagation Control

Beam Steering Using Active Artificial Magnetic Conductors: A 10-Degree Step Controlled Steering

A new miniaturized dual-band FSS with second-order response and independent operating bands

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