期刊
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 68, 期 3, 页码 1599-1606出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2019.2943712
关键词
Frequency translation; time-modulated metasurfaces
资金
- Defence Science Organisation (DSO) National Laboratories, Singapore [DSOCO15027]
- Air Force Office of Scientific Research (AFOSR) [FA9550-15-1-0101]
- AFOSR MURI Program [FA9550-18-1-0379]
Temporally modulated metamaterials have attracted significant attention recently due to their nonreciprocal and frequency converting properties. Here, a transparent, time-modulated metasurface, which functions as a serrodyne frequency translator, is reported at X-band frequencies. With a simple biasing architecture, the metasurface provides electrically tunable transmission phase that covers 360 degrees. A sawtooth waveform is used to modulate the metasurface, allowing Doppler-like frequency translation. Modal analysis of an analogous time-modulated medium is performed to gain insight into the operation of the metasurface-based serrodyne frequency translator. Two such metasurfaces can be cascaded together to achieve magnetless devices that perform either phase or amplitude nonreciprocity.
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