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The Design And Simulation of 7mm Ortho-mode Transducer
Microwave Receiver Room
Yunwei Ning
What is the polarization of electromagnetic wave?
Vertical
Horizontal
)/sin( txAEy
)/sin( txAEz
Linearly Polarized Signals
What is the polarization of electromagnetic?
Right Circular
Left Circular
)90/sin( txAEy
)/sin( txAEz
)90/sin( txAEy
)/sin( txAEz
Radio Astronomy Definition To convert linear to circular, a 90 degree phase-shifter is needed which retards one of the linear polarizations.
Circularly Polarized Signals
Why do we need OMT?
垂直极化 水平极化
V/H (垂直 /水平 )
The location of OMT in the receiver and why is the OMT is so important?
Feed Horns
OMT
LNA
OMT45º
Tw
ist90º
PhaseShifter
→
Tra
nsi
tio
n
Myl
ar W
ind
ow
Circular Polarizer
LO Ref12-16.7 GHz@ 0 dBm
NoiseDiode
Termination orPulse Cal Input
MagicTee
WG toCoax
WG toCoax
22 dB
KaDCM
RFPost-Amp
NF < 5 dB
8 dB
IFPost-Amp
NF < 2.5 dB
x3
25-41GHz
44-49 GHz
RCP IF Output8-18 GHz
DC-18GHz
KaDCM
x344-49 GHz
LCP IF Output8-18 GHz
22 dB
RFPost-Amp
NF < 5 dB
8 dB
IFPost-Amp
NF < 2.5 dB
25-41GHz
DC-18GHz
35 dB
LNACoaxto WG
2.9m
m
RC P
Cal Coupler
Qu
artz
Win
do
w
2.9m
m
Coaxto WG
35 dB
LNA Qu
artz
Win
do
w
Cal Coupler
LC
P
RF26-40 GHz
Thirteenth Synthesis Imaging Workshop - 2012
The location of OMT in the receiver and why is the OMT is so important?
The types of OMT
CSIRO. Receiver Systems for Radio Astronomy
The types of OMT
CSIRO. Receiver Systems for Radio Astronomy
What limit the bandwidth?
CSIRO. Receiver Systems for Radio Astronomy
What limit the bandwidth?
CSIRO. Receiver Systems for Radio Astronomy
What limit the bandwidth?
What limit the bandwidth?
What limit the bandwidth?
CSIRO. Receiver Systems for Radio Astronomy
What limit the bandwidth?
CSIRO. Receiver Systems for Radio Astronomy
TE (10) TE (2n+1 0)TE (10) TE (2n+1 2n)
Turnstile Junction Waveguide OMT
CSIRO. Receiver Systems for Radio Astronomy
Turnstile Junction
Pyramidal stub Square prism + pyramidal stub
Cylindrical stub
2 cylinders
conical stub 2 square prism
Turnstile Junction
CSIRO. Receiver Systems for Radio Astronomy
30.00 32.50 35.00 37.50 40.00 42.50 45.00 47.50 50.00Freq [GHz]
1.00
1.02
1.05
1.08
1.10
1.13
Y1
tourniquetXY Plot 1 ANSOFT
Curve Info max
VSWR(w p1:1)Setup1 : Sw eep 1.1148
VSWR(w p1:2)Setup1 : Sw eep 1.1226
30.00 32.50 35.00 37.50 40.00 42.50 45.00 47.50 50.00Freq [GHz]
-3.10
-3.08
-3.06
-3.04
-3.02
-3.00
-2.98
-2.96
-2.94
-2.92Y
1tourniquetXY Plot 5 ANSOFT
Curve Info max
dB(S(w p1:2,w p2:1))Setup1 : Sw eep -2.9249
dB(S(w p1:2,w p3:1))Setup1 : Sw eep -2.9507
E-plane bend
CSIRO. Receiver Systems for Radio Astronomy
E-plane bend
CSIRO. Receiver Systems for Radio Astronomy
30.00 32.50 35.00 37.50 40.00 42.50 45.00 47.50 50.00Freq [GHz]
1.000
1.002
1.005
1.008
1.010
1.013
1.015
1.018
VS
WR
(wp
1)
e_bendXY Plot 3 ANSOFT
Curve Info max
VSWR(w p1)Setup1 : Sw eepL='7mm'
1.0170
30.00 32.50 35.00 37.50 40.00 42.50 45.00 47.50 50.00Freq [GHz]
-0.0037
-0.0025
-0.0012
0.0000
0.0013
0.0025
0.0037d
B(S
(wp
1,w
p2
))e_bendXY Plot 4 ANSOFT
Curve Info max
dB(S(w p1,w p2))Setup1 : Sw eepL='7mm'
0.0036
Y-junction Power Combiner
CSIRO. Receiver Systems for Radio Astronomy
Y-junction Power Combiner
CSIRO. Receiver Systems for Radio Astronomy
30.00 32.50 35.00 37.50 40.00 42.50 45.00 47.50 50.00Freq [GHz]
1.020
1.025
1.030
1.035
1.040
1.045
1.050
1.055
1.060
VS
WR
(wp
1)
arc_TXY Plot 3 ANSOFT
Curve Info max
VSWR(w p1)Setup1 : Sw eepa='-1.35mm' b='0.6mm' corn='0.5mm'
1.0595
30.00 32.50 35.00 37.50 40.00 42.50 45.00 47.50 50.00Freq [GHz]
-3.08
-3.06
-3.04
-3.02
-3.00
-2.98
-2.96
Y1
arc_TXY Plot 3 ANSOFT
Curve Info max
dB(S(w p1,w p2))Setup1 : Sw eepa='-1.35mm' b='0.6mm' corn='0.5mm'
-2.9982
dB(S(w p1,w p3))Setup1 : Sw eepa='-1.35mm' b='0.6mm' corn='0.5mm'
-2.9680
7-step Tchebyschev Transformer
CSIRO. Receiver Systems for Radio Astronomy
30.00 32.50 35.00 37.50 40.00 42.50 45.00 47.50 50.00Freq [GHz]
1.01
1.02
1.03
1.04
1.05
1.06
1.07
VS
WR
(wp
1)
zukangpipeiXY Plot 3 ANSOFT
Curve Info max
VSWR(w p1)Setup1 : Sw eepjt4_L='2.5mm' jt4_w ='4mm'
1.0647
30.00 32.50 35.00 37.50 40.00 42.50 45.00 47.50 50.00Freq [GHz]
-0.0045
-0.0040
-0.0035
-0.0030
-0.0025
-0.0020
-0.0015
-0.0010
-0.0005
0.0000
dB
(S(w
p1
,wp
2))
zukangpipeiXY Plot 3 ANSOFT
Curve Info max
dB(S(w p1,w p2))Setup1 : Sw eepjt4_L='2.5mm' jt4_w ='4mm'
-0.0003
simulation result of OMT
CSIRO. Receiver Systems for Radio Astronomy
30.00 32.50 35.00 37.50 40.00 42.50 45.00 47.50 50.00Freq [GHz]
1.00
1.02
1.05
1.08
1.10
1.13
1.15
1.18
1.20
Y1
HFSSDesign1XY Plot 2 ANSOFT
Curve Info max
VSWR(w p1:1)Setup1 : Sw eep 1.1623
VSWR(w p1:2)Setup1 : Sw eep 1.1851
30.00 32.50 35.00 37.50 40.00 42.50 45.00 47.50 50.00Freq [GHz]
-0.04
-0.03
-0.02
-0.01
0.00
0.01
0.02Y
1
HFSSDesign1XY Plot 5 ANSOFT
Curve Info max min
dB(S(w p1:1,w p2:1))Setup1 : Sw eep 0.0098 -0.0335
dB(S(w p1:2,w p3:1))Setup1 : Sw eep 0.0143 -0.0313
30.00 32.50 35.00 37.50 40.00 42.50 45.00 47.50 50.00Freq [GHz]
-80.00
-75.00
-70.00
-65.00
-60.00
-55.00
-50.00
-45.00
Y1
HFSSDesign1XY Plot 3 ANSOFT
Curve Info max
dB(S(w p1:1,w p1:2))Setup1 : Sw eep -46.3960
dB(S(w p2:1,w p3:1))Setup1 : Sw eep -46.4452
VSWR 1.18(1.5)
Insertion Loss 0.04dB(0.3)
Orthogonal isolation -46dB(-30)
Electric field vectors
CSIRO. Receiver Systems for Radio Astronomy
the evolution of Turnstile Junction OMT
The comparison of two bfai Junction OMT
CSIRO. Receiver Systems for Radio Astronomy
Dual ridge bfai Junction OMT
CSIRO. Receiver Systems for Radio Astronomy
30.00 32.50 35.00 37.50 40.00 42.50 45.00 47.50 50.00Freq [GHz]
1.10
1.15
1.20
1.25
1.30
1.35
1.40
1.45
Y1
HFSSDesign1XY Plot 6 ANSOFT
Curve Info max
VSWR(w p1:1)Setup1 : Sw eepd_ridge2_h='1.42mm' d_ridge3_h='0.57mm'
1.3749
VSWR(w p1:2)Setup1 : Sw eepd_ridge2_h='1.42mm' d_ridge3_h='0.57mm'
1.4155
The next year plan
7mm corrugated horn
The next year plan
High Electron Mobility Transistor
(HEMT)
7mm low noise amplifier
Thank you
