A Fast and Efficient Design Method for Circuit Analog Absorbers Consisting of Resistive Square-Loop Arrays

Han, Ye; Che, Wenquan; Christopoulos, C.; Xiong, Ying; Chang, Yumei

doi:10.1109/temc.2016.2524553

Cited by 58 publications

(21 citation statements)

References 20 publications

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“…It is clear that the values of the gaps (g 1 and g 2 ) must be suitable for the size of varactors we used, which means that g 1 and g 2 can be decided based on the provided dimensions of the varactors. The physical dimensions of the two FSSs can then be estimated by the formulas provided in [30] and [34]. It should be mentioned that the functions are mainly related to frequency f p .…”

Section: Design Of the Tunable Rasorbermentioning

confidence: 99%

Tunable Frequency-Selective Rasorber Based on Varactor-Embedded Square-Loop Array

Wang

Shen

et al. 2019

IEEE Access

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This paper presents a varactor-based tunable frequency-selective rasorber (FSR) with embedded bias grid. The proposed structure consists of a lossy layer based on square-loop arrays and a lossless layer. Each layer has an embedded wire grid that provides the bias voltage for the varactors through metallic vias. This arrangement can avoid unnecessary effects associated with the additional biasing network. An equivalent circuit model is developed to explain how the structure can provide a tunable transmission window within the absorption band. Simple design guidelines for the tunable FSR are then provided. The performance of the proposed structure is measured in a parallel-plate waveguide setup. Both simulated and measured results show that by changing the bias voltage from 16 to 4 V, the center transmission frequency of the FSR can be tuned from 5.2 to 3.8 GHz continuously. The insertion loss of the FSR within the transmission window is only 0.59 dB at 5.2 GHz and a fractional bandwidth of 93.1% (2.4-6.58 GHz) for −10 dB reflectivity is achieved under the normal incidence.

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Section: Design Of the Tunable Rasorbermentioning

confidence: 99%

Tunable Frequency-Selective Rasorber Based on Varactor-Embedded Square-Loop Array

Wang

Shen

et al. 2019

IEEE Access

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“…The resistive SL element, either by lossy film [5,6] or by loading lumped resistors in metallic SL [7][8][9][10], has been extensively researched in regards to wideband absorption and low CAA profile. In previous studies, only the reflection and absorption performances of the resistive SL element are investigated; no researcher to date has analyzed the corresponding transmission performance.…”

Section: Design Of Resistive Square-loop Elementmentioning

confidence: 99%

“…The resistive square loop (SL) is one of the most often-used elements in CAA design. It is polarization-insensitive and can realize wideband absorption through lossy film [5,6] or loading lumped resistors [7][8][9][10]. A well-designed FSR must possess a low insertion loss at the transmission band apart from the wideband absorptive properties, however, which means that the resistive sheet must be nearly transparent at the operating frequency with minimum insertion loss.…”

Section: Introductionmentioning

confidence: 99%

Polarization-Insensitive Frequency-Selective Rasorber Based on Square-Loop Element

Chen¹,

Guo²,

Sang³

et al. 2019

PIER M

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This paper presents a polarization-insensitive frequency selective rasorber which has high in-band transmission at high frequency and wideband absorption at low frequency based on squareloop and parallel LC resonance. The rasorber consists of a bandpass FSS and a resistive sheet plus a slot-type metallic four-legged loaded element as the bandpass FSS element. The resistive element is realized by inserting several strip-type parallel LC structures into a resistor-loaded square-loop element, which allows the surface current to be controlled as necessary and the wave at the resonance frequency to be passed with minimum insertion loss. Wideband absorption is realized at low frequency, where the bandpass FSS is nearly totally reflected, and the FSR performs as an absorber. Simulation results show the transmission band at 9.9 GHz with transmissivity higher than 96% and the absorption band with absorptivity higher than 85% from 2.83 GHz to 8.6 GHz for TE-polarized 30 • incidence and from 3.22 GHz to 8.48 GHz for TM-polarized 30 • incidence. The absorptive/transmissive performance of the FSR structure is also verified by experimental measurements.

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“…Another popular method to widen the bandwidth is to introduce frequency-selective or reactive surfaces, the effects of which are usually modeled by simple equivalent circuits. This type of structure is usually called a circuit analog absorber [8][9][10][11][12][13][14][15][16][17][18]. Circuit analog absorbers were also actively studied using equivalent circuits and optimizations usually combined with multiple-layer [8,9] multiple-resonance [10][11][12], or mixed [18] techniques, resulting in a significant bandwidth extension [12] up to 128% based on 90% absorption criteria.…”

Section: Introductionmentioning

confidence: 99%

Design of Wideband Microwave Absorbers Using Reactive Salisbury Screens with Maximum Flat Reflection

Kim¹,

Kim²,

Lee³

2019

J Electromagn Eng Sci

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This paper presents a design methodology for wideband single-layered microwave absorbers with arbitrary absorption at the design center frequency using reactive Salisbury screens. The bandwidth of the absorber increases when the flatness of the reflection response at the design center frequency is maximized. Based on this observation, closed-form design formulas for wideband absorbers are derived. As they are scalable to any design frequency, wideband reactive screens can be systematically realized using two-dimensional periodic crossed-dipole structures patterned on a resistive sheet. Based on this method, a single-layered absorber with a 90% bandwidth improved to 124% of the design center frequency is presented. For the purpose of physical demonstration, an absorber with a design center frequency of 10 GHz is designed and fabricated using a silver nanowire resistive film with a surface resistance of 30 Ω/square. The measured absorption shows a good agreement with both the calculation and the electromagnetic simulation.

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A Fast and Efficient Design Method for Circuit Analog Absorbers Consisting of Resistive Square-Loop Arrays

Cited by 58 publications

References 20 publications

Tunable Frequency-Selective Rasorber Based on Varactor-Embedded Square-Loop Array

Tunable Frequency-Selective Rasorber Based on Varactor-Embedded Square-Loop Array

Polarization-Insensitive Frequency-Selective Rasorber Based on Square-Loop Element

Design of Wideband Microwave Absorbers Using Reactive Salisbury Screens with Maximum Flat Reflection

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