LI CM N i LI M U ii DANH MC HNH V. iv MC LC 1 Chng 1. L THUYT
CHUNG V ANTEN V ANTEN VI DI 4 1. L thuyt chung v anten. 4 1.1. Gii
thiu anten. 4 1.2. Cc tham s c bn ca anten . 5 1.2.1. S bc x sng in
t bi mt anten. 5 1.2.2. Gin bc x. 6 1.2.3. Mt cng sut bc x. 9
1.2.4. Cng cng sut bc x. 10 1.2.5. H s nh hng. 11 1.2.6. H s tng
ch. 11 1.2.7. Phn cc. 12 1.2.8. Bng thng. 14 1.2.9. Tr khng vo. 14
2. L thuyt chung v anten vi di. 15 2.1. Gii thiu. 15 2.1.1. u im v
hn ch ca anten vi di. 16 2.1.2. C ch bc x. 17 2.2. Cc loi anten vi
di thng dng. 19 2.2.1. Anten patch vi di (Microstrip Patch Antenna)
19 2.2.2. Anten vi di lng cc (Microstrop Dipole Antenna) 21 2.2.3.
Anten khe mch in (Printed Slot Antenna). 21
2.2.4. Anten sng chy vi di (Microstrip Traveling-Wave Antenna).
22 2.3. Cc k thut cp ngun cho anten vi di. 23 2.3.1. ng truyn vi di
(Microstrip Feed). 23 2.3.2. Tip in bng cp ng trc (Coaxial Feed).
25 2.3.3. Ghp gn (Proximity Coupled Microstrip Feed). 26 2.3.4. Ghp
khe h (Aperture-Coupled Microstrip Feed). 26 2.4. Mng anten vi di.
28 2.4.1. Gii thiu. 28 2.4.2. ng dn song song. 29 Chng 2. TM HIU
PHN MM AWR 34 1. Gii thiu phn mm AWR. 34 2. Mi trng thit k AWR. 35
2.1. Cc thnh phn c bn ca AWR. 35 2.2. Cc thao tc c bn trn AWR. 37
2.2.1. Schematic v Netlist trong MWO/AO. 37 2.2.2. S h thng trong
VSS. 38 2.2.3. Cu trc EM. 38 2.2.4. To layout vi MWO v AO. 40
2.2.5. To th cho h s o lng ng ra. 43 2.2.6. Biu din m phng. 44 Chng
3. THIT K ANTEN VI DI 50 1. nh hng ca cc thng s n thit k. 50 1.1.
Cht nn. 50 1.2. Hnh dng patch. 51 1.3. K thut tip in. 52
2. Thit k,tnh ton thng s. 53 2.1. Patch. 54 2.1.1. Cht nn. 54
2.1.2. Tn s thit k. 54 2.1.3. Mode c bn. 54 2.1.4. T s kch thc. 55
2.1.5. Chiu di patch. 55 2.1.6. Chiu rng patch. 55 2.1.7. Bng thng
ca patch. 56 2.1.8. V tr t patch. 57 2.2. Mt phng t. 57 2.3. ng ni
vi di. 57 2.3.1. Cht nn. 58 2.3.2. Sng trong ng truyn vi di. 58
2.3.3. rng hiu dng ca ng truyn vi di. 59 2.3.4. Gi tr quasi-static
ca tr khng c trng. 60 2.3.5. phn tn trong ng truyn vi di. 60 2.3.6.
rng ng truyn vi di. 62 2.4. Khe h v nhnh ct. 63 2.4.1. V tr t khe
h. 63 2.4.2. di khe h. 63 2.4.3. rng khe h. 64 2.4.4. Chiu di hiu
dng ca nhnh ct. 64 2.4.5. Chiu di nhnh ct. 64 3. Thit k,m phng bng
AWR. 65
3.1. M phng trn AWR. 66 3.1.1. Thit lp thng s cho anten. 66
3.1.2. Thit k anten trn AWR. 69 3.2. Kt qu m phng. 74 4. Kt lun v
hng pht trin ca ti. 76 TI LIU THAM KHO 78
Truyn thng khng dy v ang pht trin rt nhanh trong nhng nm gn y,
theo cc thit b di ng ang tr nn cng ngy cng nh hn. tha mn nhu cu thu
nh cc thit b di ng, anten gn trn cc thit b u cui cng phi c thu nh
kch thc. Cc anten phng, chng hn nh anten vi di (microstrip antenna)
v anten mch in (printed antenna), c cc u im hp dn nh kch thc nh v d
gn ln cc thit b u cui, s l la chn tha mn yu cu thit k trn. Cng bi l
do ny, k thut thit k anten phng bng rng thu ht rt nhiu s quan tm ca
cc nh nghin cu anten. Gn y, c bit l sau nm 2000, nhiu anten phng mi
c thit k tha mn cc yu cu v bng thng ca h thng truyn thng di ng t bo
hin nay, bao gm GSM (Global System for Mobile communication, 890
960 MHz), DCS (Digital Communication System, 1710 1880 MHz), PCS
(Personal Communication System,1850 1990 MHz) v UMTS (Universal
Mobile Telecommunication System, 1920 - 2170 MHz), c pht trin v xut
bn trong nhiu cc ti liu lin quan.
Anten phng cng rt thch hp i vi ng dng trong cc thit b truyn thng
cho h thng mng cc b khng dy (Wireless Local Area Network, WLAN)
trong cc di tn 2.4 GHz (2400 2484 MHz) v 5.2 GHz (5150 5350
MHz).Anten vi di vn c bng thng hp nn vic m rng bng thng thng l mt
yu cu ht sc quan trng i vi cc ng dng thc t hin nay. Do , vic gim
kch thc v m rng bng thng ang l xu hng thit k chnh cho cc ng dng thc
t ca anten vi di.
Kha lun tp trung nghin cu v thit k mt anten vi di tuyn tnh hnh
ch nht vi k thut tip in thch hp bng phn mm AWR nhm lm r nhng c trng
c bn nh c tnh bc x,bng thng tr khng ca anten vi di. Kha lun gm 3
chng :
Chng 1 : L thuyt v anten v anten vi di. Chng 2 : Gii thiu phn mm
AWR. Chng 3 : Thit k,m phng anten vi di bng AWR. Phn u trong chng 1
gii thiu v nh ngha anten cng vi cc tham s c bn ca n nh gin bc x,h s
nh hng,h s tng chPhn tip theo trnh by s lc v l thuyt anten vi di,u
v nhc im cc loi anten vi di v cc k thut tip in thng gp cho
chng.
Chng 2 trnh by mt cch tng qut v cch tng quan v phn mm thit k
AWR,s lc cch s dng phn mm.
Chng 3 i vo tnh ton,thit k cc tham s cn thit cho mt anten patch
vi di tuyn tnh ghp khe h v tin hnh m phng n trn phn mm AWR.Cui chng
3 l phn kt lun v t ra nhng hng pht trin tip theo nhm gip ti hon
thin hn.
