A Novel Method for Enhancement of Gain Bandwidth of a Hybrid 3-State Reconfigurable Reflectarray Metasurface Antenna

초록

This paper proposes a novel method for enhancing the gain bandwidth of hybrid 3-state reconfigurable reflectarray metasurface antennas (RRMAs) containing passive unit cells. The gain bandwidth is significantly improved by adjusting the reflection phase of the unit cells. First, the theoretical gain bandwidth is estimated using a peak gain formula based on quantization efficiency, following which it is experimentally verified by fabricating RRMAs for the maximum and minimum gain bandwidths. The measured results are found to be in good agreement with the theoretical results, with 3-dB gain bandwidths for the beam switching angles of -30° and 30° in the E-plane confirmed to be 2,860 MHz (28.3%) and 3,210 MHz (31.8%) for the maximum gain bandwidth and 630 MHz (6.2%) and 690 MHz (6.8%) for the minimum gain bandwidth, respectively.

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