Waveform selectivity at the same frequency

Hiroki Wakatsuchi; Daisuke Anzai; Jeremiah J Rushton; Fei Gao; Sanghoon Kim; Daniel F Sievenpiper

doi:10.1038/srep09639

Waveform selectivity at the same frequency

Sci Rep. 2015 Apr 13:5:9639. doi: 10.1038/srep09639.

Authors

Hiroki Wakatsuchi¹, Daisuke Anzai², Jeremiah J Rushton³, Fei Gao⁴, Sanghoon Kim³, Daniel F Sievenpiper³

Affiliations

¹ 1] Center for Innovative Young Researchers, Nagoya Institute of Technology, Gokiso-cho, Showa, Nagoya, Aichi, 466-8555, Japan [2] Department of Electrical and Electronic Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa, Nagoya, Aichi, 466-8555, Japan.
² Department of Electrical and Electronic Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa, Nagoya, Aichi, 466-8555, Japan.
³ Applied Electromagnetics Group, Electrical and Computer Engineering Department, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA.
⁴ 1] Applied Electromagnetics Group, Electrical and Computer Engineering Department, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA [2] The Science and Technology on Antenna and Microwave Laboratory, Xidian University, Xi'an, Shaanxi 710071, China.

Abstract

Electromagnetic properties depend on the composition of materials, i.e. either angstrom scales of molecules or, for metamaterials, subwavelength periodic structures. Each material behaves differently in accordance with the frequency of an incoming electromagnetic wave due to the frequency dispersion or the resonance of the periodic structures. This indicates that if the frequency is fixed, the material always responds in the same manner unless it has nonlinearity. However, such nonlinearity is controlled by the magnitude of the incoming wave or other bias. Therefore, it is difficult to distinguish different incoming waves at the same frequency. Here we present a new concept of circuit-based metasurfaces to selectively absorb or transmit specific types of waveforms even at the same frequency. The metasurfaces, integrated with schottky diodes as well as either capacitors or inductors, selectively absorb short or long pulses, respectively. The two types of circuit elements are then combined to absorb or transmit specific waveforms in between. This waveform selectivity gives us another degree of freedom to control electromagnetic waves in various fields including wireless communications, as our simulation reveals that the metasurfaces are capable of varying bit error rates in response to different waveforms.