Low-Profile Broadband Absorber Based on Multimode Resistor-Embedded Metallic Strips

Binchao Zhang, Cheng Jin*, Zhongxiang Shen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

80 Citations (Scopus)

Abstract

This article proposes a new method to realize a low-profile broadband absorber. The unit cell of the proposed absorber consists of two layers: a lossy layer with four rotationally symmetric bent metallic strips embedded with two chip-resistors, which is modified from a doubly fed dipole antenna, and a metallic ground separated from the lossy layer by an air spacer. Three resonant modes of the metallic strip embedded with two chip-resistors are generated, and the current in the strip passes through the chip-resistors under different modes and it is finally consumed, resulting in energy dissipation. As a result, an ultrawideband absorber is realized. The designed absorber is fabricated and measured, and the measured absorption band with a fractional bandwidth of 127.9% is achieved for at least 10-dB reflectivity reduction under the normal incidence. In addition, the thickness of the designed absorber is only 0.08λL, where λL is the wavelength at the lowest operating frequency.

Original languageEnglish
Article number8941301
Pages (from-to)835-843
Number of pages9
JournalIEEE Transactions on Microwave Theory and Techniques
Volume68
Issue number3
DOIs
Publication statusPublished - Mar 2020

Keywords

  • Circuit analog (CA) absorber
  • frequency-selective surface (FSS)
  • multimode metallic strips
  • planar absorber

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