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The design of a microwave absorber resonating in X-band having ultrathin thickness with polarization-controlled behavior has been reported in this paper. The unit cell of reported absorber comprises two resonating structures which proffer two absorption peaks at 8.74 and 8.80 GHz in the X-band, achieving an absorptivity of over 96%. It provides a full width at half maximum (FWHM) bandwidth of 820 MHz. The structure is ultrathin with the thickness (0.01λ0) of the absorber with respect to the lowest resonating frequency, i.e., at 8.74 GHz. The sixfold symmetry of the design of the novel hexagonal unit cell structure results in polarization insensitivity under normal angle of incidence. For the oblique incidence of waves, it also achieves high values of absorption for both TE and TM polarizations stable up to 60° incident angle. The absorption behavior has been demonstrated by plotting the surface-current distribution at the resonating frequencies. The proposed absorber finds its applications in stealth designs for high frequency radars (X-Band), surveillance radar, defence tracking, higher resolution imaging, and weather monitoring.

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Polarization-Controlled Broadband Frequency Selective Surface-Based Absorber for Stealth Design in High Frequency Radar

  • 章节

  • 发表日期：

    2026年

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  • Gaurav Chaitanya,
  • Harshita Sharma,
  • Pratik Chawda,
  • Paritosh Peshwe,
  • Ashwin Kothari

摘要

The design of a microwave absorber resonating in X-band having ultrathin thickness with polarization-controlled behavior has been reported in this paper. The unit cell of reported absorber comprises two resonating structures which proffer two absorption peaks at 8.74 and 8.80 GHz in the X-band, achieving an absorptivity of over 96%. It provides a full width at half maximum (FWHM) bandwidth of 820 MHz. The structure is ultrathin with the thickness (0.01λ0) of the absorber with respect to the lowest resonating frequency, i.e., at 8.74 GHz. The sixfold symmetry of the design of the novel hexagonal unit cell structure results in polarization insensitivity under normal angle of incidence. For the oblique incidence of waves, it also achieves high values of absorption for both TE and TM polarizations stable up to 60° incident angle. The absorption behavior has been demonstrated by plotting the surface-current distribution at the resonating frequencies. The proposed absorber finds its applications in stealth designs for high frequency radars (X-Band), surveillance radar, defence tracking, higher resolution imaging, and weather monitoring.