An Instrumental test observation for 22GHz and 43GHz quasi-optical circuit of KVN receivers March 18...
Transcript of An Instrumental test observation for 22GHz and 43GHz quasi-optical circuit of KVN receivers March 18...
![Page 1: An Instrumental test observation for 22GHz and 43GHz quasi-optical circuit of KVN receivers March 18 th 2009 Seog-Tae Han, Jung-Won Lee, Jiman Kang, Sang-Sung.](https://reader033.fdocuments.in/reader033/viewer/2022051402/5697bfa71a28abf838c98b37/html5/thumbnails/1.jpg)
An Instrumental test observation for22GHz and 43GHz quasi-optical
circuit of KVN receivers
March 18th 2009
Seog-Tae Han, Jung-Won Lee, Jiman Kang, Sang-Sung Lee, Do-young Byun,
Do-Heung Je, Moon-Hee Chung, Seog-Oh Wi.
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Outline
- Eevaluation of Quasi-optical circuit for 22GHz and 43GHz bands
- Test observation for quasi-optics circuit
- Summary
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Total Quasi-optical Circuit Evaluation
for 22GHz and 43GHz bands
Outline(I)
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Quasi-optical circuit forMulti-band receivers
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Frequency
(GHz)
Loss
(dB)
Cross-
Pol.
(dB)
Beam
Deviation
(mm)
LPF1 Transmission 22 0.2 35 <1mm
43 0.2 35 <1mm
Reflection 86 0.2 30 <1mm
129 0.1 30 <1mm
LPF2 Transmission 22 0.2 30 <1mm
Reflection 43 0.2 35 <1mm
LPF3 Transmission 86 0.1 30 <1mm
Reflection 129 0.1 30 <1mm
• It took about more than 4years for design and test Good results to be used quasi-optical components
Summary of the experimental results of LPFs
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22/43GHz band Quasi-optics circuit for simultaneous observation.
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HPBW at Cass. focus @ 43GHz : approx. 30mm @ 22GHz : approx. 60 mmBeam Deviation between two beams : less than 1mm
Beam deviation 22/43GHz for total Q.O circuit
Red : 22GHzGreen : 43GHz
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Cass.focus
Comparison between theoretical and measuredbeam size at cassegrain focus
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Beam radii near Cass. focus at 22GHz
2mm (2/50) differenceWithout LPF With LPF
49.4mm47.6mm
(Transmission through LPF2)
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2mm (2/26.4) differenceWithout LPF With LPF
26.4mm 24.5mm
Beam radii near Cass. focus at 43GHz(Reflection by LPF2)
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w0a=3λ
z
2000
22 )//(.)/(
4
abboazoboaab wwwwwwK
• Woa/Wob : 26.5/24.7 @ 43GHz : 49.5/47.4@22GHz 1.05 both 22/43GHz• Beam coupling loss due to mismatch both 22/43GHz apporxi. less than 1%
Evaluation axial beam mismatch between theo. and exp.
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LPF Loss Measurement Setup
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The additional Receiver Noise Temperature Due to the LPFs
LPF1 Contribution
0.0
5.0
10.0
15.0
20.0
9000 9200 9400 9600 9800 10000 10200 10400
FSyn [MHz]
Nois
e C
ontr
ibuti
on [
K]
22G LCP22G RCP43G LCP43G RCP
LPF2 Contribution
0.0
5.0
10.0
15.0
20.0
9000 9500 10000 10500
FSyn [MHz]
Noi
se C
ontr
ibut
ion
[K]
22G LCP22G RCP43G LCP43G RCP
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Quasi-optical circuit forMulti-band receivers
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Quasi-optical circuit at LabQuasi-optical circuit at Lab
LPF1
LPF2
LPF3M1
M2
M3
Flat MHorn 22G
M4
Flat M
M5Cal
chopper
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Quasi-optical circuit installed at receiver room of antennaQuasi-optical circuit installed at receiver room of antenna
M5
Calchopper
22GHz RX
43GHz RX
M4 M1
M2M3
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Outline(II)
Test observation forEvaluation of Quasi-optics Circuit
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Contour Map of Jupiter for 22GHz and 43GHz bands
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Contour Map of Jupiter for 22GHz and 43GHz bands
22GHz( Red )
43GHz( Black )
Bold lines show HPBW
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22GHz( Red )
43GHz( Black )
The Pointing offset between 22GHz and 43GHz band at Jupiter
)9.2,"6.1(, ELAZ
October 28th 2008
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43GHz( Black )
The Pointing offset between 22GHz and 43GHz band at Jupiter
)"7.0,"1.0(, ELAZ
22GHz( Red )
March 6th 2009
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Radiation patterns of Jupiter for 22GHz and 43GHz bands
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Orion-KL H2O and SiO Maser Line
Simultaneous Observation Results !!!!!on October 28th 2008
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Aperture efficiencies at 22GHz/ 43GHz
Efficiency(%)
EL(°)
Remark TB*(K)
Aperture efficiencies at 22GHz
Venus 68(70) 30 LPF2 505+-25**
Aperture efficiencies at 43GHz
Venus 68.8(70) 32 LPF2 450+-32
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Summary
Pointing offset between 22GHz and 43GHz - less than 1” ( Pointing error of KVN antennas : 4”) Successfully done simultaneous observation - 22GHz and 43GHz bands Aperture efficiency 68%(70%) at both 22/43GHz
Quasi-optical evaluation for 86GHz and 129GHz - must be harder than that of previous ones Development of 86GHz and 129GHz receiver optics - at least 2011.
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Thanks for your attention