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8/3/2019 De Thi Anten Va Truyen Song_2011_KSTN_K54
1/1
Nguyn Tin tKSTNTVT K54DHBKHN
TRNG I HC BCH KHOA H NIVIN IN T- VIN THNG
s: 2
THI MN: ANTEN & TRUYN SNGNgy thi: 20/12/2011
Thi gian lm bi: 90 pht.c php sdng ti liu.
Trng nhm mn hc: Trng bmn:
Cu 1: Hy nu cch t anten Yagi thu tt sng in tpht ra t anten ca ipht c sng phn cc ngang.
Cu 2: Hy gii thch ti sao sng cc ngn thch hp vi phng thc truyn sngtrc tip trong tm nhn thng, v dnh trong thng tin viba, thng tin v tinh?
Cu 3: Nu cu to, nguyn l lm vic ca dn anten Tuanike. Hy v thphng
hng ca h anten gm 2 tng chn t. Hy phi hp trkhng v tip in choanten Tuanike bng cp ng trc c trkhng sng 75.
Cu 4: Cho tuyn thng tin c ly 40 km. Chiu cao ca anten phtv anten thu lnlt l 80 m v 60 m. Canten pht v anten thu u l anten Parabol c ng knhbng 2m v hiu sut s dng b mt l 0,6. Tn ssng truyn l 2 GHz. Tnh nhy ti thiu ca my thu my thu tt trong iu kin l tng, kh quyn sch,khng c ma, b qua fading.