Abstract
This paper presents the design and analysis of a low-pass spatial filter which has wideband absorption at high frequency using a 3D metamaterial rasorber (MR). The unit cell of the 3D MR is composed of several stacked layers of square patches with tapered dimensions, which are separated by thin lossy dielectric laminas. Every two adjacent layers’ metallic patches constitute a resonance cavity, and the inside lossy dielectric substrate results in absorption at the resonance frequency. The stacked metal–dielectric laminas construct a frustum pyramid. With the dimensions of the resonance cavities tapering from the bottom layer to the top layer, the pyramid absorbs over their resonance frequencies so that wideband absorption can be achieved. Besides, the incident wave at the frequencies below all these resonance frequencies can transmit through these cavities. Hence, the pyramid also constructs a low-pass spatial filter. The operation mechanism of this 3D MR structure is analyzed from several aspects by numerical simulation, and experimental measurement has also been executed to verify the design. The 3D metamaterial rasorber performs as an absorber in the Ku-band and a low-pass filter below the X-band. The absorption band with absorptivity higher than 80% spans from 12.3 GHz to 18.2 GHz, and the insertion loss at the frequency below 11.1 GHz is less than 0.9 dB.
Highlights
Since Landy et al first proposed the concept of a perfect metamaterial absorber (MA),1 research on the theories and designs of MAs has provoked increasing interest from researchers
For many stealthy applications in the antenna system, wideband absorption is usually required at a given frequency band, while transmission performance is necessary in other bands
We propose a 3D low-pass metamaterial rasorber (MR) based on multiresonance of the multilayered metal–dielectric frustum pyramid structure, which has a wideband absorption in the Ku-band while becoming nearly transparent below the X-band with low insertion loss
Summary
Since Landy et al first proposed the concept of a perfect metamaterial absorber (MA), research on the theories and designs of MAs has provoked increasing interest from researchers. There have been many works on the theories and designs of MRs in recent years, including 2D structures and 3D structures.. There have been many works on the theories and designs of MRs in recent years, including 2D structures and 3D structures.21–23 Most of these MRs have a wideband absorption band but a narrow transmission band. For many stealthy applications in the antenna system, wideband absorption is usually required at a given frequency band, while transmission performance is necessary in other bands. We propose a 3D low-pass MR based on multiresonance of the multilayered metal–dielectric frustum pyramid structure, which has a wideband absorption in the Ku-band while becoming nearly transparent below the X-band with low insertion loss. The interpretation of the operation mechanism for the MR is deeply developed, and several main parameters that affect the absorption/transmission performance have been analyzed so that the performance of the MR will be customizable based on the proposed method and analysis in this paper
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