대기중 상대 습도에 따른 테라헤르츠 감쇠연구

Abstract

In this study, I measured power attenuation in the range of 0–1THz based on different water vapor densities. THz pulses propagated through an 18.61-m humidity control cell. The average relative humidity in the cell was calculated accurately using two hygrometers and was within the maximum error range of 1%. The Radio communication Sector of the International Telecommunication Union (ITU-R) P. 676.11 provides an estimation method for atmospheric attenuation of electromagnetic waves in the frequency band range of 1–1000GHz. I confirmed a discrepancy in the experimental value in ITU-R as water vapor density increased. These results were similar to the results reported at Oklahoma state university in 2018. In the present study, I has, thus, introduced a simple method to reduce inconsistency in the far-wing region. The high strength ITU-R pseudo line 1.780 THz can be effective from 0 to 1THz. The pseudo-line slope can be changed in three ways, i.e. by changing the center frequency, strength, and width of the pseudo-line. A change in the center frequency hardly resulted in any difference from the experimental value of the 1.940 THz pseudo-line. Compared with the existing 1.780 THz line, the 1.940 THz pseudo-line shows a maximum 26dB/km reduction in the W2 region and does not exceed the maximum 8dB/km even with the inclusion of the entire wing regions. Additionally, i defined self and foreign continuum coefficients through three methods and compared the results with those of the other experiments.