J4 ›› 2015, Vol. 42 ›› Issue (1): 130-135.doi: 10.3969/j.issn.1001-2400.2015.01.021

• Original Articles • Previous Articles     Next Articles

Dual-band ultra-thin metamaterial absorber and its application in reducing RCS of the microstrip antenna

GAO Jun;ZHANG Hao;CAO Xiangyu;YANG Huanhuan;YANG Qun;LI Wenqiang   

  1. (Information and Navigation College, Air Force Engineering Univ., Xi'an  710077, China)
  • Received:2013-09-07 Online:2015-02-20 Published:2015-04-14
  • Contact: GAO Jun E-mail:gjgj9694@sina.com

Abstract:

A novel ultra-thin dual-band metamaterial absorber is designed. Its absorbing mechanism is illuminated by calculating the effective impedance and analyzing the electric fields as well as currents distributions. Then the absorber is applied to the dual-band microstrip antenna to reduce its in-band RCS (Radar Cross Section). The results show that this absorber achieves high absorption in two frequency bands. Moreover, its absorbing properties are incident angle insensitivity and polarization independence, and when it is loaded to the dual-band microstrip antenna, it can reduce the antenna's RCS by 8.59dB and 9.9dB at 4.29GHz and 6.49GHz, respectively, which are the working frequencies of the dual-band antenna. There is a good agreement between simulated and measured results, showing that this absorber can be used for the improvement of the dual-band antenna's in-band invisibility of the antenna.

Key words: metamaterial absorber, dual-band, microstrip antenna, radar cross section, ultra-thin

CLC Number: 

  • TM15