A Flexible Multifunctional Active Frequency Selective Surface With Angular and Polarization Stability for Curved Surface Conformal

Sun, Guang; Wang, Junjie; Feng, Dejun; Xing, Shiqi; Wang, Xuesong

doi:10.1109/tap.2022.3216497

Cited by 14 publications

(1 citation statement)

References 33 publications

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“…These properties make them special to be workable for wider range of applications such as dichroic reflectors [1], stealth technology [2][3][4], Radar Cross section (RCS) exploitation [5], radome design [6][7][8], antenna characteristics manoeuvring such as beam steering and gain enhancement [9][10][11][12][13]. Active structures especially multifunction designs [14,15], which embody multiple features of filtering in one package, are preferred over the passive structures which have fixed frequency response containing one filtering function in practice. Secondly, active structures have advantage of post fabrication adjustments over the passive ones.…”

Section: Introductionmentioning

confidence: 99%

Frequency selective surface design with multifunction response for multibands

Shah,

Cao

2024

Eng. Res. Express

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The active frequency selective surface (AFSS), which can switch between five bands and has multifunctional response, is novel inclusion in the spatial filters domain. The proposed AFSS consists of double orthogonal metal Layers disposed on two sides of a substrate. This active structure adopts a four-bit scheme with embedded parallel bias lines used to feed four PIN diodes. The nine independently controllable combinations procure nine different frequency responses. The operating nine combinations switch between bands of center frequencies 1.54 GHz, 2.21 GHz, 2.94 GHz, 2.99 GHz and 3.2 GHz, which have corresponding fractional bandwidths of 18.3%, 26.6%, 12.1%, 8.4% and 1.3%, respectively. These frequencies cover the two, polarization and electromagnetic, switching functions. This multiband and multifunctional design also achieves reasonable angular stability without spurious resonance. Justification to how the proposed design works is provided through surface current distribution, electric field intensity and equivalent circuit model. The simulated multiband design is fabricated and proved its authenticity by the free space measurements scheme.

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Section: Introductionmentioning

confidence: 99%

Frequency selective surface design with multifunction response for multibands

Shah,

Cao

2024

Eng. Res. Express

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An ultra‐thin switched state active frequency selective surface absorber with wide bandwidth using semi‐analytical method

Jibran,

Jha,

Sharma

et al. 2024

IET Microwaves Antenna & Prop

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Using low‐voltage forward biased PIN diodes, an ultrathin switched states active frequency selective surface based microwave absorber is designed. Using a semi‐analytical method, the NXP#BAP70‐03 PIN diode‐based single polarised unit‐cell of the active FSS absorber is rigorously analysed and its equivalent circuit model is developed. The unit‐cell of the structure is selected as such to increase the envelope of the operating bandwidth and thus a total measured operating bandwidth extending from 1.70 to 11.36 GHz with reflectivity ≤−10 dB and the fractional bandwidth of 148.4% is achieved. This envelope also contains a 21.05% minimum, and 94.76% maximum fractional bandwidths corresponding to their resonance frequencies. It has been achieved by the absorber with the unit‐cell size of 0.113λL × 0.113λL × 0.048λL where λL is the wavelength corresponding to the lowest operating frequency. The structure has been fabricated and experimentally verified for the normal and the angular incidences of the electromagnetic wave up to 30°. An exhaustive state‐of‐art comparison has also been made to demonstrate the novelty of the proposed work. Due to its low thickness of 0.048λL, and wide envelope of the operating bandwidth; it is a potential candidate for a smart stealth system, electromagnetic camouflage, and adaptive radar absorbing materials.

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