Thiet Ke Che Tao Bo Chia Cong Suat Kieu Cau Wilkinson Trong He Thong Truyen Nang Luong Khong Day...
Transcript of Thiet Ke Che Tao Bo Chia Cong Suat Kieu Cau Wilkinson Trong He Thong Truyen Nang Luong Khong Day...
-
Abstract
This paper presents the study, design, fabrication of 4 - way Wilkinson power divider to be used for the microwave
power transmission system at S band. The Wilkinson power divider divides the signal from the oscillator is 4 - way the
equal amplitude and phase before send to the power amplifier. The design and simulated results have been carried out
by ADS2009 package - the professional design software for microwave engineering. The experimental results
demonstrate the ability in broadband applications and relevance of the power divider for the microwave power
transmission at S band. All simulations and measure results will be reported.
THIT K CH TO B CHIA CNG SUT KIU CU WILKINSON
TRONG H THNG TRUYN NNG LNG KHNG DY BNG TN S
ThS. on Hu Chc, KS. Nguyn Th Hng
Khoa in - in t, Trng i Hc Dn Lp Hi Phng
I. Gii thiu
ic khuch i tn hiu c cng sut ln bng
tn S gp rt nhiu kh khn. V vy chng ta
thng thc hin bng cch s dng nhiu b khuch i
cng sut c cng sut ra nh hn ri sau mi kt hp
li t cng sut mong i. Mun thc hin iu ny
ngi ta nghin cu cc k thut chia v cng cng
sut. Hnh 1 m t mt h thng pht cng sut ln s
dng cho vic truyn thng tin hoc nng lng khng
dy s dng cc b chia/cng cng sut. Do b
chia/cng cng sut l mt thnh phn ca h thng siu
cao tn v n c nhim v chia/cng cng sut tn hiu li
vo thnh nhiu tn hiu li ra ng pha hoc ngc li.
V
B chia
cng
sut
1:4
B
cng
cng
sut
4:1
Ngun DC
OSC
BUF
PA
PA
PA
PA
Hnh 1. Cu trc h thng pht nng lng khng dy
OSC: Osccilator;
BUF: Buffer Amplifier ;
PA: Power Amplifier .
Trong thc t, b chia/cng cng sut kiu cu
Wilkinson hay c dng nht bi y l cu trc c c
tnh khng tn hao nu nh tt c cc cng li ra u c
phi hp tr khng vi li vo v s cch ly gia cc cng
rt tt. E.J. Wilkinson l ngi pht trin b chia ny
nn b chia/cng c t theo tn ng. B chia/cng
cng sut WPD l mt phng php chia cng sut ng
pha v ng bin .
B chia WPD c s l b chia hai. B chia ny s
dng on dy /4 ti trung tm tn s thit k vi hai
nhnh chia cng sut c tr khng c tnh l v mt
in tr 2*Z ni hai cng ra vi nhau. Cu trc ca b 0
chia WPD 1:2 s dng k thut mch di c cho
hnh 2.
Hnh 2. B chia cng sut Wilkinson 1:2.
B chia WPD c tt c cc cng ra u c phi hp
tr khng 50 v cch ly gia cc li ra vi nhau nhng n
cng b suy hao. Ma trn tn x b chia WPD 1:2 c
a ra cng thc sau:
a.Cu trc dng mch di
b. S mch tng ng
(1)
22 Bn tin Khoa hc - o to
Hot ng nghin cu khoa hcHot ng nghin cu khoa hc
-
Ch rng khi cc cng ra u c phi hp tr
khng (S =0) vi li vo th chng ta c:11
Chng ta s xy dng c b chia WPD 1:4 bng
cch mc ghp ni tng cc b chia WPD 1:2. Trong
trng hp b chia WPD 1:4 ta c ma trn tn x nh sau:
(2)
0 / 2 / 2 / 2 / 2
/ 2 0 0 0 0
/ 2 0 0 0 0
/ 2 0 0 0 0
/ 2 0 0 0 0
j j j j
j
j
j
j
(3)
Ta cng c:
(4)
Trong khun kh bi bo ny trnh by vic m
phng, thit k v ch to mch chia cng sut Wilkinson
4 cng cng nh cc kt qu m phng v thc nghim.
II. Thit k m phng mch chia cng sut Wilkinson
2.1. Thit k m phng mch
B chia cng sut Wilkinson 1:4 c m phng, thit
k bng phn mm ADS2009. Trong trng hp ny b
chia c thit k hot ng trong di bng tn S. S
nguyn l c cho hnh 3.
Hnh 3. S nguyn l mch chia cng sut Wilkinson.
Kt qu m phng cc tham s S11, S21 v S cho 23
trn hnh 4.
Hnh 4. Kt qu m phng b chia cng sut Wilkinson 1:4.
Theo gi tr m phng S =-6.01dB, S = -41dB v 21 11
S =-45dB ti tn s 2,5GHz.23
2.2. Kt qu thc nghim
T s nguyn l ta thc hin thit k mch in nh
phn mm ADS2009. S mch in v sn phm thc t
c cho trn hnh 5. Mch in c dng ng cong nhm
mc ch lm gim kch thc ca mch in v s ghp
ni gia cc cng ra vi nhau.
Hnh 5: B chia cng sut Wilkinson 1:4.
S dng my phn tch mng tin hnh o cc tham
s S v S ca mch ta c kt qu nh hnh 6 v 7. 21 31
a. S mch in b. Sn phm thc t
Hnh 6. Tham s S o c trn my phn tch mng21
23
Hot ng nghin cu khoa hcHot ng nghin cu khoa hc
-
Hnh 7. Tham s S o c trn my phn tch mng.31
S =-5.985 v S =-5.886 l nhng gi tr tt hn c 21 31
mong i khi so snh vi kt qu t c trong m
phng hnh 4.
Cc tham s S , S v S c cho trn cc hnh 11 22 33
8,9,10.
Tham s S c cho trn hnh 11. Theo S = -23 23
22.3dB ti tn s f= 2.5GHz.
Hnh 10. Tham s S o c trn my phn tch mng.33
Hnh 9. Tham s S o c trn my phn tch mng22
Hnh 8. Tham s S o c trn my phn tch mng.11
Hnh 11. Tham s S o c trn my phn tch mng.23
III. Kt lun
B chia/cng vi h s chia 4 kiu cu Wilkinson c
tnh i xng to c cc dao ng ng pha v ng
bin trn c s t mt b dao ng OSC. B chia
c ch to chia ra 4 ng a ti cc b khuch i
cng sut PA. B chia/cng ny p ng y cc yu
cu chia ng pha v ng bin b.
TI LIU THAM KHO
[1] David M.Pozar, Microwave Engineering,
John Willey & Son, INC, Second Editon;
[2] Dang Thi Thanh Thuy, Nguyen Dinh The Anh
and Bach Gia Duong Study, design and fabrication of
a high-power combiner using 8-way Wilkinson Bridge
for a transmitter system of an L-band, VNU Journal
of Science, Mathematics Physics 27, No. 1S (2011)
239-242.
[3] Taufiqqurrachman, Deni Permana Kurniadi,
Design and Realization Wilkinson Power Divider at
Frequency 2400MHz for Radar S-Band, IOSR
Journal of Electronics and Communication
Engineering (IOSR-JECE), Volume 3, Issue 6 (Nov. -
Dec. 2012), PP 26-30;
[4] A. Wentzel, V. Subramanian, A. Sayed, and G.
Boeck, Novel Broadband Wilkinson Power
Combiner, Proceedings of the 36th European
Microwave Conference, pp. 212- 215, 2006.
[5] E. J. Wilkinson, An N-way hybrid power
divider, IRE Trans. Microwave Theory Tech., vol.
MTT8, pp. 116118, Jan. 1960.
24 Bn tin Khoa hc - o to
Hot ng nghin cu khoa hcHot ng nghin cu khoa hc
Page 1Page 2Page 3