A Continuously Frequency Tunable Electromagnetic Wave Absorber Using Varactor Diodes and Multiple Slits

버랙터와 다중 슬릿들을 결합한 광대역 주파수 가변 흡수체

  • Cho, Soo-Bean (Department of Electronic Engineering, Sejong University) ;
  • Jo, Eon-Seok (Department of Electronic Engineering, Sejong University) ;
  • Kim, Dongho (Department of Electronic Engineering, Sejong University)
  • 조수빈 (세종대학교 전자공학과) ;
  • 조언석 (세종대학교 전자공학과) ;
  • 김동호 (세종대학교 전자공학과)
  • Received : 2016.01.04
  • Accepted : 2016.02.16
  • Published : 2016.04.30


We propose a thin electromagnetic wave absorber using varactor diodes combined with intentionally introduced multiple slits, which enables continuous sweep of an absorption frequency band throughout relatively wide frequencies. The absorption frequency range of conventional electrically tunable absorbers has been restricted by high capacitance of varactor diodes. In order to overcome the problem, we introduce parasitic capacitance and connect them with varactors in series, which reduces the total capacitance dramatically. As a result, we can raise the operating absorption frequency up to the X-band region. Moreover, we can also control the operating frequencies by modifying the number of slits with little change in an entire frequency sweep range. Good agreement between simulated and measured results show the validity of our proposal.


Supported by : 한국연구재단


  1. R. L. Fante, M. T. McCormack, T. D. Syst, and M. A. Wilmington, "Reflection properties of the salisbury screen", IEEE Trans. Antennas Propag., vol. 36, no. 10, pp. 1443-1454, Oct. 1988.
  2. F. Costa, A. Monorchio, and G. Manara, "Analysis and design of ultra thin electromagnetic absorbers comprising resistively loaded high impedance surfaces", IEEE Trans. Antennas Propag., vol. 58, no. 5, pp. 1551-1558, May. 2010.
  3. Y. Han, W. Che, C. Christopoulous, and Y. Chang, "Investigation of thin and broadband capacitive surfacebased absorber by the impedance analysis method", IEEE Trans. Electromagn. Compat., vol. 57, no. 1, pp. 22-26, Feb. 2015.
  4. A. Tennant, B. chambers, "A single-layer tuneable microwace absorber using an active FSS", IEEE Microw. Wireless Compon. Lett., vol. 14, no. 1, pp. 46-47, Jan. 2004.
  5. J. Zhao, Q. Cheng, J. Chen, M. Q. Qi, W. X. Jiang, and T. J. Cui, "A tunable metamaterial absorber using varactor diodes", New J. Phys., vol. 15, p. 043049, Apr. 2013.
  6. R. Garg, "Characteristics of coupled microstriplines", IEEE Tran. Microw. Theory Tech., vol. 27, no. 7, pp. 700-705, Jul. 1979.