Abstract
In this study, a sub-terahertz high-gain antenna for long-distance transmission in the 200-GHz frequency band is designed, fabricated, and measured. Three types of antennas are fabricated, namely, a horn reflector antenna, cassegrain antenna, and an elliptical cassegrain antenna for beam-width expansion, and a measurement environment is configured to measure antenna performance. Additionally, the reception power level and radiation pattern are measured. As a result of the measurement, antenna gains of 36, 52, and 33.3 dBi and beam widths of 3.5, 0.4, and 30° are measured at the center frequency of 245 GHz.
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