Abstract
The receiving properties of fabricated parasitic slot antenna arrays on ZnS dielectric substrates for 28-THz-CO2 laser radiation were investigated. When the CO2 laser beam was irradiated on the antennas directly (from the air-side), the E-plane antenna patterns of the parasitic slot antenna arrays became increasing sharper as the number of slots in the array increased from 1to 7. On the other hand, the H-plane antenna patterns did not change with the number of slots because the slot antennas were not arrayed in the H-plane. It was found that the antenna theory based on the transmission line model was applicable at 28 THz. When the CO2 laser beam was irradiated through the substrate (from the substrate-side), rippled antenna patterns were observed due to multiple reflection in the substrate because the thickness of the substrate was much longer than the dielectric wavelength of the CO2 laser. It was also found that the antenna receiving properties were affected by the thickness of the substrate. Furthermore, as expected from the theory, the power gain of the 7-parasitic slot antenna array improved by approximately 7 dB compared to that of the single-slot antenna at 28 THz.
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