A wideband multilayer tunable filter using active frequency selective surface

Liang, Yan-Hong; Chen, Mingsong; Zhou, Yijie; Peng, Lin; Dai, Li

doi:10.1002/mop.33052

Cited by 5 publications

(3 citation statements)

References 24 publications

(15 reference statements)

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“…In recent years, in the microwave field, electromagnetic metamaterials can be composed of varactor diodes/ PIN diodes, [14][15][16][17] and their electromagnetic properties can be adjusted by applying a voltage to the diodes. Xu et al 18 embed PIN diodes within a metamaterial to implement a switchable metamaterial reflector/absorber.…”

Section: Introductionmentioning

confidence: 99%

C, X, and Ku three‐band tunable metamaterial absorber based on varactor diodes

Jiang

Liang

et al. 2022

Micro & Optical Tech Letters

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A three-band tunable polarization-insensitive metamaterial absorber is proposed in this paper. The unit cell of the absorber is composed of a dielectric substrate, a metal patch, and four varactor diodes welded on the top layer. A simple metal via bias network is designed to facilitate the absorption frequency tuning of the absorber. The simulation results show that when there is no bias voltage (0 V), the proposed absorber has three absorption peaks of 88%, 99.5%, and 99.8% under normal incidence at 7.27, 10.93, and 15.84 GHz, respectively. Furthermore, by adjusting the reverse bias voltage (0-19 V) of the varactor, the first absorption peak of the absorber can be tuned from 7.27 to 8.2 GHz and the second absorption peak tuned from 10.93 to 11.4 GHz.Meanwhile, the tuning range for the third absorption peak is 15.84-16.1 GHz. Furthermore, the three-band absorption and frequency tunable characteristics of the absorber are confirmed by experimental tests.

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Section: Introductionmentioning

confidence: 99%

C, X, and Ku three‐band tunable metamaterial absorber based on varactor diodes

Jiang

Liang

et al. 2022

Micro & Optical Tech Letters

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“…However, the absorption bandwidth is not sufficiently wide unless a multiresonance structure is introduced to excite multiple continuous absorption modes in the frequency spectrum 3 to realize wideband absorption. An alternative approach is to introduce lumped elements into the metallic structures to cause ohmic loss or realize the function of tuning, [4][5][6][7][8][9][10] which can break away from the single electric resonance and broaden the absorption bandwidth effectively. However, the use of dielectric boards and metallic structures still contribute a certain weight, and the application of lumped elements makes the structure intricate.…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional lightweight metamaterial with ultra‐wideband microwave absorption

Yang

Zhao

et al. 2022

Micro & Optical Tech Letters

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A three-dimensional lightweight metamaterial (MM) with ultra-wideband microwave absorption is proposed in this paper. Based on the concept of MMs, periodically arranged resistive films are introduced into the standing frame to form a standing lossy structure, which can introduce electric resonances in the gap between adjacent sub-wavelength unit cells at lower frequencies. Several standing wave modes are also excited in the standing lossy structure at higher frequencies, resulting in an ultra-wideband absorption for electromagnetic waves. The full-wave simulation demonstrates that the MM can absorb over 90% of the incident wave energy in the range 1.46-40 GHz, with a relative bandwidth of 185.9%. The experimentally measured results correspond to the simulated results across the entire frequency range. In addition, the proposed MM is lightweight, easy to fabricate.

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“…[14][15][16][17] The results show that different conductive units and interlayer arrangements can greatly affect the electromagnetic transmission characteristics, which may increase the resonance peak, reduce the bandwidth, or even reverse the characteristics. [18][19][20] Therefore, more diverse filtering products could be developed through reasonable multi-layer structure design. However, the reported multilayer structure is mostly processed into the form of a composite plate by laser engraving, chemical coating, vacuum coating, and so on, [21][22] rarely involving flexible textile materials, which could be easily fabricated into multilayer structures through weaving, knitting, braiding or other textile finishing methods.…”

mentioning

confidence: 99%

Design, preparation and electromagnetic characteristics analysis of single, double and three-layer cross-shaped frequency selective fabrics

Guan

Xue

et al. 2022

Textile Research Journal

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Based on the research basis of single-layer cross-shaped frequency selective fabrics, the electromagnetic transmission characteristics of double-layer and three-layer cross-shaped frequency selective fabrics were explored in this paper. The frequency selective fabrics with different multilayer structures and specific-sized conductive units were designed, and then prepared by the computer engraving method and tested using the free-space method. The results show that the single-layer sample is less affected by the polarization mode of the electromagnetic wave, while the effect of the incidence angle is slightly larger. For the frequency selective fabric samples with the same frequency selective surface layers, the frequency selective characteristics of the double-layer samples are more ideal than those of the single-layer samples, while the electromagnetic loss of the three-layer samples is large and the narrow-band transmission characteristic is weakened. For the frequency selective fabric samples with the complementary frequency selective surface layers, the double-layer sample mainly shows band-pass characteristics and the narrow-band transmission characteristics are better than the single-layer sample. The three-layer sample of ‘patch + aperture + patch’ presents band-pass characteristics, and the ‘aperture + patch + aperture’ sample generates resonance at multiple frequency points, but the resonance peaks are all less than –10.00 dB, meaning that the sample presents full shielding characteristics in the test frequency band. The equivalent circuit model was built to explore the electromagnetic transmission mechanism, revealing the fabric type and structure, and the conductive unit type and size will affect the equivalent impedance of the frequency selective fabrics, thus further influencing the electromagnetic transmission characteristics.

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A wideband multilayer tunable filter using active frequency selective surface

Cited by 5 publications

References 24 publications

C, X, and Ku three‐band tunable metamaterial absorber based on varactor diodes

C, X, and Ku three‐band tunable metamaterial absorber based on varactor diodes

Three‐dimensional lightweight metamaterial with ultra‐wideband microwave absorption

Design, preparation and electromagnetic characteristics analysis of single, double and three-layer cross-shaped frequency selective fabrics

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