Publications by authors named "Lun Qi"
Article Synopsis
- A low-frequency broadband multilayer metamaterial absorber (MMA) is presented, utilizing resistive frequency selective surfaces (RFSSs) and consists of a three-layer RFSS, three-layer polymethacrylimide foam substrates, and a copper film.
- The MMA achieves over 90% absorption across a wide frequency range from 1.91 to 20.78 GHz, covering S, C, X, and Ku bands, while maintaining a thin profile of 0.102 λ (where λ is the wavelength of the lowest frequency).
- Experimental results of the fabricated prototype show excellent performance consistency with numerical simulations, demonstrating stability in absorption for various angles and both TE and TM modes.
A design method of five-band polarization-insensitive metamaterial absorber (MMA) based on the slotted structures and the magnetic rubber is proposed for L-, S-, C-, X-, and Ku-band applications. The slotted structures of the top layer, which evolved from two square rings, are used to excite multi-resonance. The range of the electromagnetic (EM) parameters of a magnetic rubber substrate, which is used to adjust the equivalent impedance of the absorber to match the free space impedance in different bands, is estimated using the impedance matching principle.
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- Existing smart radiation devices have drawbacks like being bulky, having limited sizes, and needing continuous power sources.
- This study introduces a new smart thermal control coating using CaF/VO core-shell microspheres that are easy to apply and can adjust their thermal properties with temperature changes.
- With the ability to increase emissivity from 0.47 at 30 °C to 0.83 at 90 °C, this research could lead to advancements in the development of innovative materials for thermal management applications.