Second-Order Terahertz Bandpass Frequency Selective Surface With Miniaturized Elements

Ebrahimi, Amir; Nirantar, Shruti; Withayachumnankul, Withawat; Bhaskaran, Madhu; Sriram, Sharath; Al-Sarawi, Said F.; Abbott, Derek

doi:10.1109/tthz.2015.2452813

Cited by 93 publications

(45 citation statements)

References 39 publications

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“…There are most studies about multilayer bandpass frequency selective surfaces which have high complexity and require high precision of microfabrication such as multilayer bonding, alignment of top and bottom layer elements, etc. [17][18][19]. This study demonstrates the use of simple single layer FSS designs in the THz region, which have more than 70% transmission at the central frequency independent of various angles of incidence.…”

Section: Introductionmentioning

confidence: 93%

Terahertz Bandpass Frequency Selective Surfaces on Glass Substrates Using a Wet Micromachining Process

Ramzan

Khan

Bolat

et al. 2017

J Infrared Milli Terahz Waves

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This paper presents terahertz (THz) frequency selective surfaces (FSS) implemented on glass substrate using standard microfabrication techniques. These FSS structures are designed for frequencies around 0.8 THz. A fabrication process is proposed where a 100-μm-thick glass substrate is formed through the HF etching of a standard 500-μm-thick low cost glass wafer. Using this fabrication process, three separate robust designs consisting of single-layer FSS are investigated using high-frequency structural simulator (HFSS). Based on J Infrared Milli Terahz Waves (2017) the simulation results, the first design consists of a circular ring slot in a square metallic structure on top of a 100-μm-thick Pyrex glass substrate with 70% transmission bandwidth of approximately 0.07 THz, which remains nearly constant till 30°angle of incidence. The second design consists of a tripole structure on top of a 100-μm-thick Pyrex glass substrate with 65% transmission bandwidth of 0.035 THz, which remains nearly constant till 30°angle of incidence. The third structure consists of a triangular ring slot in a square metal on top of a 100-μm-thick Pyrex glass substrate with 70% transmission bandwidth of 0.051 THz, which remains nearly constant up to 20°angle of incidence. These designs show that the reflections from samples can be reduced compared to the conventional sample holders used in THz spectroscopy applications, by using single layer FSS structures manufactured through a relatively simple fabrication process. Practically, these structures are achieved on a fabricated 285-μm-thick glass substrate. Taking into account the losses and discrepancies in the substrate thickness, the measured results are in good agreement with the electromagnetic simulations.

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Section: Introductionmentioning

confidence: 93%

Terahertz Bandpass Frequency Selective Surfaces on Glass Substrates Using a Wet Micromachining Process

Ramzan

Khan

Bolat

et al. 2017

J Infrared Milli Terahz Waves

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“…To derive the values of these lumped elements, following equations are used:

C = ɛ_{0} ɛ_{eff} \frac{2 p}{normalπ} \ln true[\frac{1}{\sin true(\frac{π d}{2 p} true)} true]

L = {normalμ}_{0} {normalμ}_{e ff} \frac{l}{2 π} \ln true[\frac{1}{\sin true(\frac{π w}{2 l} true)} true]

…”

Section: Designing Of Fssmentioning

confidence: 99%

“…Both finite and infinite arrays can be simulated. For long‐range communication, FSS works as a performance enhancer …”

Section: Introductionmentioning

confidence: 99%

“…For long-range communication, FSS works as a performance enhancer. [7][8][9] FSS acts as band pass radomes for missiles, 10 used in radio astronomy, 11,12 its multi-dimensional characteristic plays a key role in deep space exploration. 13 In the existing published literature for stability with respect to polarization, a symmetrical 14 and a compact structure is required 15 with respect to incidence angle.…”

Section: Introductionmentioning

confidence: 99%

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Polarization independent dual-bandpass frequency selective surface for Wi-Max applications

Yadav¹,

Jain²,

Sharma³

2018

Int J RF Microw Comput Aided Eng

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In this article, the performance of polarization independent dual‐bandpass frequency selective surface (FSS) is investigated. The proposed design of FSS unit cell comprises of metallic structure is based on customized plus shape within plus ring inside a square ring and etched on one side of FR4 substrate. The geometrical dimensions of unit cell are optimized in such a way that the structure possesses the dual‐bandpass characteristic for Wi‐Max applications. The aspect dimensions of unit cell are 0.16 λ × 0.16 λ × 0.013 λ with respect to first resonant frequency. The FSS provide stable response for different angle of incidence in transverse electric and transverse magnetic polarization. An equivalent circuit model of FSS is established and its results are verified by Advanced Design System tool. A prototype of FSS is designed, fabricated and measured. Good agreement between simulated and measured results verifies the dual‐bandpass FSS.

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“…Moreover, the values of the electrical parameters were firstly calculated from the physical dimensions of the capacitive and inductive patches by using the formulas given in . Using Agilent Advanced Design System (ADS) software , the phase of the reflection coefficient was calculated and good agreement between the equivalent circuit model and the numerical simulations was achieved after slight tuning of the calculated values of the electrical parameters, as illustrated in Figure .…”

Section: Ebg‐ra Design and Measurementmentioning

confidence: 99%

Wideband and high‐gain EBG resonator antenna based on dual layer PRS

Chaabane

Djahli

Attia

et al. 2016

Micro & Optical Tech Letters

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A wideband and high‐gain electromagnetic band‐gap resonator antenna for X‐band operation is presented in this paper. A dual‐layer partially reflective surface with a wide frequency band from 8.3 to 11 GHz is proposed to enhance the 3‐dB gain bandwidth of a simple planar antenna. The measured results indicate that the proposed antenna possesses a relative 3‐dB gain bandwidth of about 33.33%, from 7.95 to 11.13 GHz, with a maximum gain of 13.57 dBi. Moreover, the measured impedance bandwidth is about 35.53%, from 7.8 to 11.17 GHz, which fairly covers the 3‐dB gain bandwidth. Hence, the proposed structure surpasses conventional techniques for widening the 3‐dB gain bandwidth. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:98–101, 2017

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Second-Order Terahertz Bandpass Frequency Selective Surface With Miniaturized Elements

Cited by 93 publications

References 39 publications

Terahertz Bandpass Frequency Selective Surfaces on Glass Substrates Using a Wet Micromachining Process

Terahertz Bandpass Frequency Selective Surfaces on Glass Substrates Using a Wet Micromachining Process

Polarization independent dual-bandpass frequency selective surface for Wi-Max applications

Wideband and high‐gain EBG resonator antenna based on dual layer PRS

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