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22대 대한민국 국회 국회정보길라잡이 국회의원검색
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Abstract 8

제1장 서론 10

1.1. 개요 10

1.2. ITU-R P.676-11 13

제2장 실험구성 16

제3장 실험 결과 20

3.1. 전력 감쇠 계산방법 20

3.2. 거리에 따른 전력 감쇠 그래프의 측정 한계치 계산 24

3.3. 거리 18.61m와 거리 1m 전력 감쇠 그래프 측정 28

3.4. ITU-R Pseudo-line과 HITRAN database의 비교 29

3.5. 링크 버짓 계산방법 31

3.6. ITU-R 시뮬레이션과의 실험값의 차이 결과 및 보정 35

3.7. 자기 및 외부 연속체 흡수 계수 계산 45

제4장 결론 48

Reference 51

표목차

Table 1. Comparison of Water Vapor Self and Foreign Continuum Parameters in THz Range. Cw and Cf Parameters are in Units of dB/km/CTHz kPa)² 46

그림목차

Fig. 1. Power attenuation changes to differences in relative humidity 14

Fig. 2.1. Schematic of (a) terahertz generation and (b) terahertz detection 16

Fig. 2.2. (a) Schematic of Multipass cell and cell setup with a THz beam path: (a) Schematic of multipass cell setup with THz beam path from Tx to Rx (b)... 17

Fig. 2.3. THz pulse fluctuations at 50% Relative humidity 19

Fig. 3.1. Measurement THz pulses and spectral data under different humidity conditions (a) Transit time of the measured THz output pulse at Water vapor... 21

Fig. 3.2. Removal of water vapor effect using ITU-R inverse simulation calculation 23

Fig. 3.3. Power attenuation limit for system transmittance and distance (a) Measured limit range for transmittance range of 0.03-0.97. Top (pink) and... 24

Fig. 3.4. Measurement THz pulses and spectral data under different humidity conditions at 1m (a) Transit time of the measured THz output pulse at Water... 26

Fig. 3.5. power attenuation data overlap at 18.61m and 1m 28

Fig. 3.6. Comparison between experimental value (red line) and ITU-PL (black line, center frequency : 1.780THz), and comparison between HITRAN database (blue line, 0... 29

Fig. 3.7. Variations in power attenuation according to rainfall rates 31

Fig. 3.8. Channel capacity graph at bandwidth of 1GHz 33

Fig. 3.9. Power attenuation measured using output and sample pulses; standard deviations from the experimental value calculated by changing the parameters... 37

Fig. 3.10. Standard deviation from experimental value measured by changing center frequency parameter of ITU-R pseudo - line in the 0.35 - 1THz range. 38

Fig. 3.11. Standard deviations from the experimental value calculated by changing the (a) center frequency parameter, (b) strength, and (c) width of... 39

Fig. 3.12. Comparison of different pseudo-lines according to varying parameters 41

Fig. 3.13. Standard deviations of wing regions with increase in water vapor density. Black dots are standard deviations of the experimental value and... 42

Fig. 3.14. Effect of shifts in center frequency on Pseudo-line in W4 and W5 43

Fig. 4. Power attenuation measured by the overlapping distances of 18.61m and 1m. Red lines indicate an increase in humidity condition by 20% from the... 48

초록보기

 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, ITU-R pseudo line 1.780THz is high strength that can effect from 0 to 1THz. I has, thus, introduced a simple method to reduce inconsistency in the far-wing region. ITU-R pseudo line 1.780THz is high strength that can effect from 0 to 1THz. We can change pseudo-line slope in 3 ways. it is to change center frequency, strength, and width of pseudo-line. when center frequency is changed, it shows the smallest difference from experimental value at 1.940THz Pseudo-line. Compared to existing 1.780THz line, it shows a maximum of 26dB/km reduction in the W2 region. also, it dose not exceed a maximum of 8dB/km, even with all wings region included. and we defined self and foreign continuum coefficients through three methods, and compared them with other experiments.

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