This paper specifically focuses on the absorber, the critical component responsible for the detector's response performance. The meta-surface absorber combines two resonant structures and achieves over 80% absorptance around 210 GHz, resulting in a broad operating frequency range. FR-4 is selected as the dielectric layer to be compatible with standard printed circuit board (PCB) technology, which reduces the overall fabrication time and cost. The absorbing unit and array layout are symmetrically designed, providing stable absorptance performance even under incident waves of different polarization angles. The polarization-insensitive absorptance characteristic further enhances the compatibility between the absorber and the detector in the application scenario. Furthermore, the thermal insulation performance of the absorber is ensured by introducing thermal insulation gaps. After completing fabrication through PCB technology, testing revealed that the absorber maintained excellent absorptance performance within its primary operating frequency range. This performance consistency closely matched the simulation results.
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| http://dx.doi.org/10.1364/OE.509580 | DOI Listing |
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Design and architecting of a broadband bullet-diamond shaped integrated frequency selective meta-surface absorber for aero-stealth platform.
Sci Rep
October 2024
Stealth & Camouflage Division, Defence Material Store R & D Establishment, DRDO, GT Road, Kanpur, UP, 208013, India.
Article Synopsis
- The study focuses on creating integrated frequency selective meta-surface (IFSMS) absorbers designed for aerospace stealth technology through a specialized metasurface combined with dielectric and conductive layers.
- A unique supercell layout was tested for its electrical response to microwave frequencies, showing consistent performance across various angles and modes, which is crucial for stealth applications.
- The fabrication process utilized advanced techniques like mask lithography with micro-carbon ink, and extensive material analysis confirmed the properties of the absorber, indicating its potential effectiveness in reducing radar visibility in specific frequency ranges.
This paper specifically focuses on the absorber, the critical component responsible for the detector's response performance. The meta-surface absorber combines two resonant structures and achieves over 80% absorptance around 210 GHz, resulting in a broad operating frequency range. FR-4 is selected as the dielectric layer to be compatible with standard printed circuit board (PCB) technology, which reduces the overall fabrication time and cost.
View Article and Find Full Text PDFWe demonstrate coherent perfect absorption (CPA) of different linearly polarized electromagnetic fields using an asymmetry transmissive meta-surface consisting of two outermost VO-metal layers and symmetrical graphene meta-gratings, as well as an intermediate C-slit metallic layer. Such a five-layered cascaded VO-metal-graphene meta-surface can perfectly trap either the x- or the y-polarized signal fields when interacting with the x-polarized control wave by imposing specific Fermi level over the graphene together with conducting- or insulating-state VO at 3 THz. On the other hand, y-polarized control wave can also interfere with either x- or y-polarized signal fields when the CPA of the electromagnetic wave operates at 3.
View Article and Find Full Text PDFWe propose a reconfigurable hybrid graphene meta-surface for modulating circularly polarized (CP) waves with dual functionalities of asymmetric transmission (AT) and monodirectional absorption. Such a meta-surface consists of three cascade dielectrics covered with identical metallic resonators and different patterned graphene sheets over the front and the back sides, respectively. The left-handed CP incidences will be transformed into right-handed CP counterparts efficiently with an AT-parameter of 0.
View Article and Find Full Text PDFThe manufacturing process for an ultrawide flexible microwave absorbing meta-surface was developed and optimized experimentally. The developed replication process consists of four main steps to demonstrate double-square loop array meta-structures: (1) mechanical machining of a master mold, (2) soft mold replication and patterned film imprinting, (3) conductive ink blade filling, (4) lamination of a base flexible film to meta sheet. Based on experimental optimization of the individual steps, the manufacturing process for a large-area flexible meta-film was established successfully.
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