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| Citation: | YAO Zhixin and XIAO Shaoqiu. Wide-angle, ultra-wideband, and polarization-insensitive circuit analog absorbers[J]. Journal of Radars, 2021, 10(2): 274–280. doi: 10.12000/JR21017
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Wide-angle, Ultra-wideband, and Polarization-insensitive Circuit Analog Absorbers
doi: 10.12000/JR21017
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Abstract
Most previous circuit analog absorbers only considered absorption performance under normal incidences, leading to bad absorption for large incident angles, particularly those > 30°. With the advancement in modern bistatic radar detection technology, radar electromagnetic waves may come from different spatial directions, thereby necessitating radar absorbers with high absorption performance under normal and oblique incidences. Thus, in this paper, we present a novel wideband absorber comprising a conductive square-loop array embedded with lumped resistors and a well-designed Wide-Angle Impedance Matching (WAIM) layer. Results show that the WAIM layer can significantly improve absorption under oblique incidences. To make the absorber design clear and simple, an Equivalent Circuit (EC) and strict calculating formulas are proposed under normal and oblique incidences. Fractional bandwidth is increased into 137.1% through measurement under normal incidence, and the structure has a common fractional bandwidth of at least 110.5% for at least 10 dB reflection reduction when the incidence angle < 45°. The similarity among EC calculated, simulated, and measured results proves the validity of the designed absorber. -
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References
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- Figure 1. The unit cell geometry of the absorber
- Figure 2. The equivalent circuit for absorber with WAIM layer
- Figure 3. The optimal reflection coefficient under normal and oblique incidence obtained by calculation and simulation
- Figure 4. The simplified equivalent circuit model for analysis
- Figure 5. The susceptances of YGND and YRLC2 under normal and oblique incidence for TM-polarized wave
- Figure 6. The susceptances of Ylayer1 and Ylayer2 under normal and oblique incidence for TM-polarized wave
- Figure 7. Reflection coefficient under TM-polarized oblique incidence with and without WAIM layer
- Figure 8. Fabricated sample
- Figure 9. Measurement setup for reflection coefficient
- Figure 10. The optimal reflection coefficient under normal and oblique incidence obtained by simulation