The Design of Wideband Nonreciprocal Transmission by Active Metasurface
IEEE Antennas and Wireless Propagation Letters(2023)
摘要
The design of wideband nonreciprocal transmission is proposed by applying active metasurface, in which the meta-atom is composed of receiving antenna, guide-wave processing part, and transmitting antenna. Favorable spatial electromagnetic performance throughout a wideband is necessary for both the receiving and transmitting antennas. The guide-wave processing part enables one-way wave guiding by including the power amplifier with its bias circuits. By appropriately combining the three parts into one single meta-atom, good non-reciprocal transmission characteristics across a wideband were demonstrated in our field-circuit cosimulation. Furthermore, a prototype of metasurface consisting of 392 elements were fabricated and measured, yielding favorable wideband performance from 7.5 to 12.5 GHz, and wide-angle performance from −70° to +70° with more than 30 dB isolation between dual-direction transmission in the near-field measurement.
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关键词
Active metasurface,cascaded structures,nonreciprocal transmission,wideband
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