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

버랙터와 다중 슬릿들을 결합한 광대역 주파수 가변 흡수체

  • Received : 2016.01.04
  • Accepted : 2016.02.16
  • Published : 2016.04.30

Abstract

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.

Keywords

Tunable Absorber;Frequency Selective Absorber;Varactor Absorber

References

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Acknowledgement

Supported by : 한국연구재단