Design of a Tunable Low-Frequency and Broadband Radar Absorber Based on Active Frequency Selective Surface

Li, Jialin; Jiang, Jianjun; Xu, Wangying; Chen, Mi; Liu, Miao; Bie, Shaowei

doi:10.1109/lawp.2015.2473688

Cited by 129 publications

(46 citation statements)

References 13 publications

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“…The active circuit control to change the frequency response can include elements such as PIN diodes, varactor diodes, radio-frequency (RF) microelectromechanical systems, and other electronic control elements that directly modify the unit cell impedance. There is extensive research on AFSS control using these elements given its ease of construction [6][7][8][9][10][11][12][13]. However, the resulting AFSSs require many active elements to provide a stable frequency response, and they are affected by aspects such as incidence angle and polarization, which complicate the circuit structure [7,8,13].…”

Section: Introductionmentioning

confidence: 99%

“…However, the resulting AFSSs require many active elements to provide a stable frequency response, and they are affected by aspects such as incidence angle and polarization, which complicate the circuit structure [7,8,13]. Moreover, a typical AFSS requires, for instance, each of its unit cells to be isolated from the bias circuit and the surrounding unit cells, as well as several RF chokes [11][12][13]. Therefore, many studies focus only on improving the electric characteristics related to the flat dielectric substrate without considering the impedance or incidence angle [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, a typical AFSS requires, for instance, each of its unit cells to be isolated from the bias circuit and the surrounding unit cells, as well as several RF chokes [11][12][13]. Therefore, many studies focus only on improving the electric characteristics related to the flat dielectric substrate without considering the impedance or incidence angle [8][9][10][11][12][13]. Nevertheless, more research is needed on designs that employ curved-foam or composite structures and take into consideration the application, operation, and performance under real environmental conditions [6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, many studies focus only on improving the electric characteristics related to the flat dielectric substrate without considering the impedance or incidence angle [8][9][10][11][12][13]. Nevertheless, more research is needed on designs that employ curved-foam or composite structures and take into consideration the application, operation, and performance under real environmental conditions [6][7][8][9][10][11][12][13]. Although some studies have been conducted for FSS based on composite materials or three-dimensional structures, they were limited to passive and impractical structure [14,15].…”

Section: Introductionmentioning

confidence: 99%

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Design of Active Frequency Selective Surface with Curved Composite Structures and Tunable Frequency Response

Lee

Park

Chun

et al. 2017

International Journal of Antennas and Propagation

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We present an active frequency selective surface (AFSS) consisting of a curved composite structure that provides structural stability and robustness. The proposed structure can operate on either the C-band (OFF state) or X-band (ON state) by controlling the PIN diode located between the cross-shaped loop and the inductive stub on the surface. Moreover, it minimizes parasitic couplings through grid-type on/off bias circuits and via holes. Thus, the AFSS guarantees isolation from the unit cell, which is a downside of a previous control technique called reconfigurable frequency selective surface. We analyzed the impact of composite structures and the three-dimensional shape on the AFSS transmission with a foam-core sandwich structure, which is light and mechanically strong, by considering conditions of a real application environment.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Design of Active Frequency Selective Surface with Curved Composite Structures and Tunable Frequency Response

Lee

Park

Chun

et al. 2017

International Journal of Antennas and Propagation

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“…V ARIABLE impedances have been widely used in many problems related to communication systems, including electronically controlled attenuators [1] and modulators [2], phase shifters [3], tunable matching networks [4], adaptive radar absorbers [5], and six-port modulators [6].…”

Section: Introductionmentioning

confidence: 99%

New Design of a Variable Impedance Based on Polarized Diodes at Microwave Frequency

Venere

Hurtado

Valle

et al. 2017

IEEE Microw. Wireless Compon. Lett.

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Abstract-In this letter, we present a new variable impedance termination consisting of two polarized diodes. To generate a complex-valued impedance, two controlled current sources polarize the diodes, which are interconnected with a Wilkinson power divider through transmission lines of different electric lengths. Because of the reduced number of diodes, this structure presents low power consumption and simple control. We validated the proposed design by implementing a prototype at the operating frequency of 1575.42 MHz. Mapping the measured results in the Smith chart, the impedance can produce reflection coefficients with full-phase coverage within the circle of magnitude 0.35 over a frequency range of 1.5-1.6 GHz.Index Terms-One-port impedance termination, p-i-n diode, programmable load, variable impedance.

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Varactor‐Tunable Frequency Selective Surface With an Appropriate Embedded Bias Network

et al. 2018

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In this work, a varactor‐tunable frequency selective surface (FSS) is proposed; it is based on a common FSS composed of annular ring slot cells, in which four varactors are loaded on each annular ring slot to dynamically tune its resonant frequency in real time. In addition, an appropriate embedded bias network is added to introduce a same direct current bias voltage for each varactor. Numerical simulations demonstrate that the resonant‐frequency of the proposed FSS can be tuned over a 77.2% wide frequency range from 2.73 to 6.16 GHz by altering the capacitance of the varactors from 1.0 to 0.1 pF; moreover, the embedded bias network has little effect on the band‐pass response, and the minimum of the reflection coefficients is less than −24 dB at all times. Finally, one effective experimental validation is carried out. The proposed tunable FSS possesses the merits of wide tuning range and high transmittance; thus, it has great potential applications in the design of tunable radomes or adaptive screening of unwanted wireless transmissions.

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Design of a Tunable Low-Frequency and Broadband Radar Absorber Based on Active Frequency Selective Surface

Cited by 129 publications

References 13 publications

Design of Active Frequency Selective Surface with Curved Composite Structures and Tunable Frequency Response

Design of Active Frequency Selective Surface with Curved Composite Structures and Tunable Frequency Response

New Design of a Variable Impedance Based on Polarized Diodes at Microwave Frequency

Varactor‐Tunable Frequency Selective Surface With an Appropriate Embedded Bias Network

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